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22-07-88/CLKSET

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk: Home » CEEFAX disks » telesoftware8.adl
Filename: 22-07-88/CLKSET
Read OK:
File size: 3F70 bytes
Load address: FFFF0E00
Exec address: FFFF802B
File contents
   10REM SETCLOCK PROGRAM FOR MASTER 128
   20REM (C) Ian Stubbs 1986
   30REM REQUIRES BBC ATS ROM
   40:
   50MODE 7
   60HIMEM=&7000
   70DIM code% 280
   80DIM hexaddr 5
   90osasci=&FFE3
  100osrdch=&FFE0
  110oswrch=&FFEE
  120osbyte=&FFF4
  130osword=&FFF1
  140oscli=&FFF7
  150PROCassemble_tools
  160PROCassemble(&7000)
  170PROCinstructions
  180PROCdemo
  190PROCcollect_data
  200PROCassemble(address)
  210PROCsave
  220PROCend
  230:
  240REM PROCEDURES
  250:
  260DEF PROCassemble(origin)
  270:
  280para%=origin+&1E0
  290FOR pass%=4 TO 6 STEP 2
  300P%=origin
  310O%=&7000
  320[OPT pass%
  330.begin
  340LDA #&D
  350STA para%
  360JSR ttx_command   \Switch on Telextext interrupts
  370LDA #1
  380STA para%
  390LDA #0
  400STA para%+1
  410JSR ttx_command   \Set channel to BBC-1
  420JSR delay
  430JSR delay
  440LDA #1
  450STA para%-4       \Set magazine number to 1 for BBC-1 target page (100)
  460LDA #17
  470STA para%
  480JSR ttx_command   \Read Teletext Adaptor Status
  490LDA para%+1
  500CMP #&FF
  510BEQ no_adaptor
  520CMP #2
  530BEQ adaptor_off
  540CMP #1
  550BEQ no_signal
  560JMP start
  570.no_adaptor
  580JSR exit
  590BRK
  600EQUB &FF
  610EQUS "No Adaptor"
  620BRK
  630.adaptor_off
  640JSR exit
  650BRK
  660EQUB 50
  670EQUS "Adaptor off"
  680BRK
  690.no_signal
  700LDA #1
  710STA para%
  720STA para%+1
  730JSR ttx_command        \Change channel to BBC-2
  740LDA #2
  750STA para%-4            \Change magazine number of target page to 2 (200), BBC-2
  760JSR delay
  770JSR delay
  780JSR delay
  790JSR delay
  800LDA #17
  810STA para%
  820JSR ttx_command        \Read Adaptor Status again
  830LDA para%+1
  840BEQ start              \If signal found then start program proper
  850JSR exit
  860BRK                    \else flag error.
  870EQUB 51
  880EQUS "No CEEFAX"
  890BRK
  900.start
  910LDA #7
  920STA para%
  930LDA #1
  940STA para%+1
  950JSR ttx_command     \Set page capture routine to get HEADER LINE ONLY
  960LDA #0
  970STA para%+16        \Set header detect byte
  980LDA #5
  990STA para%
 1000LDA #18
 1010STA para%+1
 1020LDA para%-4
 1030STA para%+2
 1040LDA #0
 1050STA para%+3
 1060LDA #&3F
 1070STA para%+4
 1080LDA #&7F
 1090STA para%+5
 1100LDA #(para% MOD 256)
 1110STA para%+6
 1120LDA #(para% DIV 256)
 1130STA para%+7
 1140JSR ttx_command     \Get page 100 from CEEFAX (BBC-1) or 200 (BBC-2)
 1150LDA #&FF            \Set "give up looking for header" threshold byte 1
 1160STA para%-1
 1170LDA #&3F            \Set byte 2
 1180STA para%-2
 1190.test_for_header
 1200LDA para%+16
 1210BNE get_time        \Check if header arrived
 1220LDY #0              \If not, wait a bit then test again
 1230.wait
 1240NOP
 1250DEY
 1260BNE wait
 1270DEC para%-1
 1280BNE test_for_header
 1290DEC para%-2
 1300BNE test_for_header
 1310JSR exit
 1320BRK
 1330EQUB 52
 1340EQUS "Can't find time/date"
 1350BRK
 1360.get_time
 1370\LDA #14
 1380\STA para%
 1390\JSR ttx_command      \Clear page grabber so it doesn't over-write data
 1400.try_again
 1410LDA #21
 1420STA para%
 1430JSR ttx_command      \Get time from TSDP
 1440LDA para%+10
 1450CMP #&FF             \Test to see if time found
 1460BEQ try_again        \Retry if not
 1470JSR delay            \1 second delay to bodge CMOS set routine to give
 1480JSR delay            \correct result
 1490JSR delay
 1500LDA #8
 1510STA para%
 1520LDA #&F
 1530LDX #para% MOD 256
 1540LDY #para% DIV 256
 1550JSR osword           \Set time in CMOS clock
 1560.get_date
 1570LDA #22
 1580STA para%
 1590JSR ttx_command      \Get date from TSDP (Only year will be used)
 1600LDA para%+12
 1610CMP #&FF             \Check to see if date found
 1620BEQ get_date         \Retry if not.
 1630LDY #&7              \Move year to correct pos. in parameter block
 1640LDX #&21
 1650.nextchar
 1660LDA para%,Y
 1670STA para%,X
 1680INY
 1690INX
 1700CPX #&25
 1710BNE nextchar
 1720LDA #ASC(",")
 1730STA para%+&19        \Insert comma after day
 1732LDA #ASC(" ")
 1734STA para%+&20        \Insert space between month and year
 1740LDY #&16             \Then ensure the rest of the date is STANDARD ASCII
 1750.next
 1760LDA para%,Y
 1770AND #&7F
 1780STA para%,Y
 1790INY
 1800CPY #&26
 1810BNE next
 1820LDA #&F
 1830STA para%+&15
 1840LDA #&F
 1850LDX #(para%+&15) MOD 256
 1860LDY #(para%+&15) DIV 256
 1870JSR osword           \Set CMOS calender
 1880LDX #(time MOD 256)
 1890LDY #(time DIV 256)
 1900JSR oscli            \Perform *TIME
 1910.exit                \Reset previous values, switch off ttx and exit
 1920LDA #7
 1930STA para%
 1940LDA #30
 1950STA para%+1
 1960JSR ttx_command      \Reset no. of rows captured to 30
 1970\LDA #14
 1980\STA para%
 1990\JSR ttx_command      \Clear page grabber
 2000LDA #12
 2010STA para%
 2020JSR ttx_command      \Switch off Teletext interrupts
 2030RTS
 2040.ttx_command         \Ttx OSWORD subroutine
 2050LDA #&7A
 2060LDX #para% MOD 256
 2070LDY #para% DIV 256
 2080JSR osword
 2090RTS
 2100.delay               \Does nothing for about a third of a second
 2110LDX #&FF
 2120LDY #&FF
 2130.delay_loop
 2140DEY
 2150NOP:NOP
 2160BNE delay_loop
 2170DEX
 2180BNE delay_loop
 2190RTS
 2200.time
 2210EQUS "TI."
 2220EQUB &D
 2230.tel
 2240EQUS "B."
 2250EQUB &D
 2260]
 2270NEXT pass%
 2280ENDPROC
 2290:
 2300DEF PROCinstructions
 2310:
 2320CLS
 2330PRINT CHR$141CHR$130"     Setclock Instructions"
 2340PRINT CHR$141CHR$130"     Setclock Instructions"
 2350VDU28,0,23,39,3
 2360PRINT "SETCLOCK gets the date and time from   "
 2370PRINT "CEEFAX and sets the Master's internal  "
 2380PRINT "CMOS calender/clock. It uses BBC-1 by  "
 2390PRINT "default but, if it cannot find any     "
 2400PRINT "Teletext on BBC-1, it will try BBC-2.  "
 2410PRINT "It is, of course, only of value to     "
 2420PRINT "users of the Master and so use has"
 2430PRINT "been made of facilities provided only  "
 2440PRINT "on that machine. The program uses      "
 2450PRINT "OSWORD routines provided by the new BBC"
 2460PRINT "ATS ROM. It is not compatible with TFS."
 2470PRINT "   This Basic program will generate the"
 2480PRINT "machine code routine SETCLOCK. You will"
 2490PRINT "be able to choose where it will run in "
 2500PRINT "memory. The filename given to the code "
 2510PRINT "will depend on the filing system you   "
 2520PRINT "are using at the moment, as will the"
 2530PRINT "choice of assembly addresses offered."
 2540PROCspace
 2550PRINT "The best address for most users will be"
 2560PRINT "&B00. This is Econet workspace and will"
 2570PRINT "be unused in the majority of cases. If "
 2580PRINT "you are using the network facility then"
 2590PRINT "&900 is probably the best place to put "
 2600PRINT "the routine. This is the cassette/RS423"
 2610PRINT "input/output area. It's also used by   "
 2620PRINT "sound envelopes 5-16 and any speech    "
 2630PRINT "upgrade which may be present. If these "
 2640PRINT "two alternatives don't suit you may    "
 2650PRINT "assemble the routine to run anywhere   "
 2660PRINT "but don't expect sensible results if   "
 2670PRINT "you put it somewhere daft.             "
 2680PROCspace
 2690PRINT "Disc users should keep the program in  "
 2700PRINT "the current directory or library and   "
 2710PRINT "call it with *<filename>. Tape users   "
 2720PRINT "should use *RUN SETCLOCK."
 2730PRINT '"   Error messages will be given if the"
 2740PRINT "clock cannot be reset. The routine can "
 2750PRINT "be re-run using CALL &<address> if you "
 2760PRINT "wish. This may be useful if you are    "
 2770PRINT "using tape."
 2780PRINT '"   If the clock has been correctly    "
 2790PRINT "reset a *TIME command is issued        "
 2800PRINT "resulting in the contents of the CMOS  "
 2810PRINT "clock being printed out as usual.      "
 2820PROCspace
 2830PRINT "The next part of this program is a "
 2840PRINT "demonstration of SETCLOCK. The CMOS    "
 2850PRINT "clock can be scrambled and then reset  "
 2860PRINT "from CEEFAX. (Follow on-screen         "
 2870PRINT "instructions.)"
 2880PRINT '"  The CEEFAX header is displayed for  "
 2890PRINT "reference throughout the demonstration."
 2900PRINT "Do not be put off by the way the CMOS  "
 2910PRINT "clock appears to lead CEEFAX. SETCLOCK "
 2920PRINT "uses the Television Service Data Packet"
 2930PRINT "to set the clock and is more accurate  "
 2940PRINT "than the header.                       "
 2950PROCspace
 2960PRINT '"  To leave the demonstration press f2."
 2970PRINT "Then follow the directions to generate "
 2980PRINT "SETCLOCK itself and save it to your    "
 2990PRINT "current filing system. If you are using"
 3000PRINT "the ROM filing system or TFS the       "
 3010PRINT "program will not be saved.             "
 3020PRINT '"  The program contains many notes so  "
 3030PRINT "you should be able to adapt it. Any    "
 3040PRINT "comments would be welcome via PRESTEL  "
 3050PRINT "mailbox 012373797."
 3060PROCspace
 3070ENDPROC
 3080:
 3090DEF PROCspace
 3100:
 3110PRINT TAB(5,19)CHR$131"Press SPACE BAR to continue"
 3120REPEAT UNTIL INKEY(-99)
 3130*FX15
 3140CLS
 3150ENDPROC
 3160:
 3170DEF PROCdemo
 3180:
 3190ON ERROR PROCerror:END
 3200VDU26
 3210CLS
 3220PRINT TAB(0,0)CHR$134"SCLOCK";CHR$135;
 3230*TTXON
 3240*HON
 3250*FX225,240
 3260PROCc_off
 3270PRINT TAB(6,2)CHR$141CHR$131"Setclock demonstration"
 3280PRINT TAB(6)CHR$141CHR$131"Setclock demonstration"
 3290PRINT TAB(9,7)CHR$141CHR$133"CMOS Clock reads:"
 3300PRINT TAB(9)CHR$141CHR$133"CMOS Clock reads:"
 3310red$=CHR$129+CHR$157+CHR$135
 3320black$=CHR$156
 3330PRINT TAB(1,20)red$;"f0  ";black$;"      ";
 3340PRINT red$;"f1  ";black$;"      ";
 3350PRINT red$;"f2  ";black$
 3360PRINT 'TAB(2)"Reset";TAB(15)"Scramble";TAB(29)"Exit demo"
 3370REPEAT
 3380*FX15
 3390PROCupdate_time
 3400IF A=240 THEN PROCsetclock
 3410IF A=241 THEN PROCunset
 3420UNTIL A=242
 3430*HOFF
 3440*TTXOFF
 3450*FX225,1
 3460VDU26
 3470ON ERROR OFF
 3480ENDPROC
 3490:
 3500DEF PROCunset
 3510:
 3520TIME$="Sat,14 Mar 1982.10:10:10"
 3530ENDPROC
 3540:
 3550DEF PROCc_off
 3560:
 3570VDU23,1,0;0;0;0;0;
 3580ENDPROC
 3590:
 3600DEF PROCc_on
 3610:
 3620VDU23,1,1;0;0;0;0;
 3630ENDPROC
 3640:
 3650DEF PROCupdate_time
 3660:
 3670REPEAT
 3680PRINT TAB(5,9)CHR$141CHR$134;TIME$
 3690PRINT TAB(5)CHR$141CHR$134;TIME$
 3700UNTIL ADVAL(-1)>0
 3710A=GET
 3720ENDPROC
 3730:
 3740DEF PROCsetclock
 3750:
 3760PRINT TAB(7,5)red$;"SETTING CMOS CLOCK  ";black$
 3770PRINT TAB(5,13)CHR$141CHR$130"CMOS Clock last reset at:"
 3780PRINT TAB(5)CHR$141CHR$130"CMOS Clock last reset at:"'
 3790PRINT CHR$131"      ";
 3800CALL &7000
 3810*TTXON
 3820PRINT TAB(6,5);SPC(30);
 3830ENDPROC
 3840:
 3850DEF PROCerror
 3860:
 3870*TTXOFF
 3880IF ERR=17 REPORT:END
 3890IF ERR=&FF error$="Sorry, no Teletext adaptor"
 3900IF ERR=50 error$="Sorry, adaptor switched off"
 3910IF ERR=51 error$="Sorry, not receiving CEEFAX"
 3920IF ERR=52 error$="Sorry, can't find date/time"
 3930error$=error$+"  "
 3940PRINT TAB(18-(LEN(error$)/2),16)red$;error$;black$
 3950VDU28,0,22,39,19
 3960CLS
 3970VDU26
 3980PROCspace
 3990PROCcollect_data
 4000PROCsave
 4010PROCend
 4020ENDPROC
 4030:
 4040DEF PROCcollect_data
 4050:
 4060CLS
 4070PRINT CHR$141CHR$134TAB(12)"Save SETCLOCK"
 4080PRINT CHR$141CHR$134TAB(12)"Save SETCLOCK"
 4090VDU28,0,22,39,3
 4100file%=FNfile_sys
 4110IF file%=0 PROCnofile:ENDPROC
 4120IF file%=1 OR file%=2 PROCtape:ENDPROC
 4130IF file%=3 OR file%=6 PROCnosave:ENDPROC
 4140IF file%=4 PROCdfs:ENDPROC
 4150IF file%=5 OR file%=8 PROCnet_adfs:ENDPROC
 4160IF file%=6 PROCtfs:ENDPROC
 4170ENDPROC
 4180:
 4190DEF PROCnofile
 4200:
 4210PRINT "There is no filing system selected. Please"
 4220PRINT "select one and re-run the program."
 4230PROCend
 4240ENDPROC
 4250:
 4260DEF PROCtape
 4270:
 4280IF file%=1 fs$="TAPE (1200 Baud)" ELSE fs$="TAPE (300 Baud)"
 4290filename$="SETCLOCK"
 4300PROCprint_fs
 4310PROCget_address
 4320CLS
 4330PRINTTAB(0,5);CHR$136CHR$129;
 4340VDU28,10,22,27,13
 4350ENDPROC
 4360:
 4370DEF PROCnosave
 4380IF file%=3 fs$="ROM" ELSE fs$="Telesoftware"
 4390PRINT "Sorry, you cannot save to the ";fs$
 4400PRINT '"filing system. Please select another"
 4410PRINT '"(e.g. disc or tape) and re-run the"
 4420PRINT '"program."
 4430PROCc_on
 4440VDU26
 4450PRINT TAB(0,15);
 4460END
 4470ENDPROC
 4480:
 4490DEF PROCdfs
 4500:
 4510fs$="DISC (DFS)"
 4520filename$="SETCLK"
 4530PROCprint_fs
 4540PRINT CHR$131"Please enter any prefix to filename"
 4550PRINT CHR$131"(i.e. :1.W. to save file to drive 1,"
 4560PRINT CHR$131"directory W.) Press <RETURN> to"
 4570PRINT CHR$131"finish entry."
 4580PROCc_on
 4590PRINT ''TAB(12)CHR$134;:INPUT "PREFIX: "prefix$
 4600PROCc_off
 4610IF LEN(prefix$)<>0 IF RIGHT$(prefix$,1)<>"." prefix$=prefix$+"."
 4620filename$=prefix$+filename$
 4630PROCget_address
 4640ENDPROC
 4650:
 4660DEF PROCnet_adfs
 4670:
 4680IF file%=5 fs$="NETWORK" ELSE fs$="DISC (ADFS)"
 4690filename$="SETCLOCK"
 4700PROCprint_fs
 4710PRINT CHR$131"Please enter any pathname that you"
 4720PRINT CHR$131"require added to the beginning of"
 4730PRINT CHR$131"the filename. Press <RETURN> to"
 4740PRINT CHR$131"finish entry."
 4750PROCc_on
 4760PRINT ''CHR$134;:INPUT "PATHNAME: "prefix$
 4770PROCc_off
 4780IF LEN(prefix$)<>0 IF RIGHT$(prefix$,1)<>"." prefix$=prefix$+"."
 4790filename$=prefix$+filename$
 4800PROCget_address
 4810ENDPROC
 4820:
 4830DEF PROCprint_fs
 4840:
 4850PRINT CHR$131"Current filing system:"CHR$135;fs$
 4860PRINT 'CHR$131"The program will be saved as"CHR$135;filename$
 4870VDU28,0,22,39,8
 4880ENDPROC
 4890:
 4900DEF PROCget_address
 4910:
 4920PRINT ''CHR$130"  Where would you like the routine?"''
 4930IF file%>2 PRINT CHR$131"1. Serial/cassette port buffers (&900)"'
 4940PRINT 'CHR$131"2. Econet workspace (&B00)"'
 4950PRINT 'CHR$131"3. At another address"'
 4960REPEAT
 4970A=GET
 4980UNTIL (file%>2 AND (A>48 AND A<52)) OR (A>49 AND A<52)
 4990IF A=49 address=&900:ENDPROC
 5000IF A=50 address=&B00:ENDPROC
 5010IF A=51 PROCuser_address:ENDPROC
 5020ENDPROC
 5030:
 5040DEF PROCuser_address
 5050CLS
 5060PROCc_on
 5070PRINT 'CHR$131"Please enter the address you require:"
 5080PRINT 'TAB(14)CHR$134;"&";
 5090address=FNhex_input
 5100PROCc_off
 5110ENDPROC
 5120:
 5130DEF FNhex_input
 5140:
 5150=USR(hex_input) AND &FFFF
 5160:
 5170DEF FNhex_string(integer)
 5180:
 5190A%=integer MOD 256
 5200X%=integer DIV 256
 5210CALL hex_string
 5220=$hexaddr
 5230:
 5240DEF FNfile_sys
 5250:
 5260A%=0
 5270Y%=0
 5280=USR(&FFDA) AND &FF
 5290:
 5300DEF PROCsave
 5310:
 5320address$=FNhex_string(address)
 5330OSCLI ("SAVE "+filename$+" 7000 +200 FFFF"+address$+" FFFF"+address$)
 5340ENDPROC
 5350:
 5360DEF PROCend
 5370VDU26
 5380CLS
 5390PRINT '''CHR$131"   The program has been saved as:"
 5400PRINT 'TAB(19-(LEN(filename$)/2))CHR$134;filename$
 5410PRINT ''CHR$131"Don't forget to save THIS Basic program"
 5420PRINT CHR$131"   too, it contains the source code!"
 5430PRINT ''
 5440PROCc_on
 5450END
 5460ENDPROC
 5470:
 5480DEF PROCassemble_tools
 5490:
 5500FOR pass%=0 TO 2 STEP 2
 5510P%=code%
 5520[OPT pass%
 5530.hex_string
 5540STA &70           \Save bytes for future use
 5550STX &71
 5560LDA #0
 5570STA hexaddr       \Clear hex string to nothing
 5580STA hexaddr+1
 5590STA hexaddr+2
 5600STA hexaddr+3
 5610LDA #&D           \Set <CR> at end of hex string
 5620STA hexaddr+4
 5630LDA &70
 5640AND #&F           \Find lower nybble of low byte
 5650JSR convert       \Find ASCII value of nybble
 5660STA hexaddr+3     \Store in string
 5670TXA
 5680AND #&F           \Find lower nybble of high byte
 5690JSR convert       \as above
 5700STA hexaddr+1
 5710LDA &70           \Find higher nybble of low byte
 5720LSR A:LSR A:LSR A:LSR A
 5730JSR convert       \as above
 5740STA hexaddr+2
 5750LDA &71           \Find higher nybble of high byte
 5760LSR A:LSR A:LSR A:LSR A
 5770JSR convert       \as above
 5780STA hexaddr
 5790RTS
 5800.convert          \SUBROUTINE returns ASCII value of nybble in A
 5810CMP #10           \Is nybble alpha? (i.e. >9)
 5820BPL alpha         \If so, jump to alpha routine
 5830CLC               \Otherwise add 48 to it and return
 5840ADC #48
 5850RTS
 5860.alpha            \It's alpha so add 55 to it and return
 5870CLC
 5880ADC #55
 5890RTS
 5900.hex_input
 5910LDX #0           \Set character counter/pointer
 5920.get_char        \get a character from input stream
 5930JSR osrdch
 5940BCS error        \Trap invalid character
 5950CMP #13
 5960BEQ end_entry    \Detect and act upon <RETURN>
 5970CMP #127
 5980BEQ delete       \Detect and act upon <DELETE>
 5990CMP #48          \Range check. Pass only 0-9 and A-E (no lower case)
 6000BMI beep
 6010CMP #71
 6020BPL beep
 6030CMP #58
 6040BMI ok
 6050CMP #65
 6060BMI beep
 6070.ok
 6080CPX #4           \Detect sneaky try at entering a 5th digit
 6090BEQ beep
 6100STA hexaddr,X    \Add chracter to string
 6110INX              \Update counter/pointer
 6120JSR oswrch       \Put character on screen
 6130JMP get_char
 6140.beep            \Make a beep and go back to get_char
 6150LDA #7
 6160JSR oswrch
 6170JMP get_char
 6180.error           \Jump out on error
 6190RTS
 6200.delete          \Action <DELETE> key
 6210CPX #0
 6220BEQ beep         \If nothing to delete, beep and go to get_char
 6230LDA #8
 6240JSR oswrch
 6250LDA #32
 6260JSR oswrch
 6270LDA #8
 6280JSR oswrch
 6290DEX
 6300JMP get_char
 6310.end_entry       \Exit collection routine
 6320CPX #4           \All 4 characters used?
 6330BEQ evaluate
 6340CPX #0           \No characters entered?
 6350BEQ quick_exit
 6360STX &70          \If not, pad with leading zeros
 6370LDA #4
 6380SEC
 6390SBC &70          \Find how many spaces to pad
 6400STA &70
 6410DEX              \Change X from counter to pointer
 6420TXA
 6430CLC
 6440ADC &70
 6450TAY              \Set Y to point at target byte
 6460.shift           \Shift valid chars to end of string
 6470LDA hexaddr,X
 6480STA hexaddr,Y
 6490DEY
 6500DEX
 6510BMI continue
 6520JMP shift
 6530.continue
 6540LDY #0            \Add leading zeros
 6550LDA #48           \(ASCII "0")
 6560.pad
 6570STA hexaddr,Y
 6580INY
 6590CPY &70
 6600BNE pad
 6610.evaluate        \Decode hex string to 2 byte integer
 6620LDA hexaddr+3
 6630JSR decode       \Low nybble, low byte
 6640STA &70
 6650LDA hexaddr+2    \high nybble, low byte
 6660JSR decode
 6670ASL A:ASL A:ASL A:ASL A
 6680CLC
 6690ADC &70           \Add two nybbles together and store in Y
 6700TAY
 6710LDA hexaddr+1     \Low nybble, high byte
 6720JSR decode
 6730STA &70
 6740LDA hexaddr       \High nybble, high byte
 6750JSR decode
 6760ASL A:ASL A:ASL A:ASL A
 6770CLC
 6780ADC &70           \Add two nybbles together and store in X
 6790TAX
 6800TYA               \Move low byte back into A & exit
 6810RTS
 6820.decode           \Nybble decode subroutine
 6830CMP #58           \Is it > 9?
 6840BPL dec_alpha
 6850SEC               \If not, subtract 48
 6860SBC #48
 6870RTS
 6880.dec_alpha
 6890SEC               \If it is, subtract 55 (ALPHA)
 6900SBC #55
 6910RTS
 6920.quick_exit       \Used only if no characters entered (essential)
 6930LDA #0
 6940TAX
 6950RTS
 6960]
 6970NEXT pass%
 6980ENDPROC
 6990:

%� SETCLOCK PROGRAM FOR MASTER 128
� (C) Ian Stubbs 1986
� REQUIRES BBC ATS ROM
(:
2� 7
<�=&7000
F� code% 280
P� hexaddr 5
Zosasci=&FFE3
dosrdch=&FFE0
noswrch=&FFEE
xosbyte=&FFF4
�osword=&FFF1
�oscli=&FFF7
��assemble_tools
��assemble(&7000)
��instructions
�	�demo
��collect_data
��assemble(address)
�	�save
��end
�:
�� PROCEDURES
�:
� �assemble(origin)
:
para%=origin+&1E0
"� pass%=4 � 6 � 2
,
P%=origin
6O%=&7000
@[OPT pass%
J
.begin
TLDA #&D
^
STA para%
h5JSR ttx_command   \Switch on Telextext interrupts
r
LDA #1
|
STA para%
�
LDA #0
�STA para%+1
�+JSR ttx_command   \Set channel to BBC-1
�
JSR delay
�
JSR delay
�
LDA #1
�KSTA para%-4       \Set magazine number to 1 for BBC-1 target page (100)
�LDA #17
�
STA para%
�3JSR ttx_command   \Read Teletext Adaptor Status
�LDA para%+1
�CMP #&FF
�BEQ no_adaptor

CMP #2
BEQ adaptor_off

CMP #1
&BEQ no_signal
0
JMP start
:.no_adaptor
DJSR exit
NBRK
XEQUB &FF
bEQUS "No Adaptor"
lBRK
v.adaptor_off
�JSR exit
�BRK
�EQUB 50
�EQUS "Adaptor off"
�BRK
�.no_signal
�
LDA #1
�
STA para%
�STA para%+1
�3JSR ttx_command        \Change channel to BBC-2
�
LDA #2
�SSTA para%-4            \Change magazine number of target page to 2 (200), BBC-2
�
JSR delay

JSR delay

JSR delay

JSR delay
 LDA #17
*
STA para%
45JSR ttx_command        \Read Adaptor Status again
>LDA para%+1
HEBEQ start              \If signal found then start program proper
RJSR exit
\,BRK                    \else flag error.
fEQUB 51
pEQUS "No CEEFAX"
zBRK
�
.start
�
LDA #7
�
STA para%
�
LDA #1
�STA para%+1
�EJSR ttx_command     \Set page capture routine to get HEADER � �LY
�
LDA #0
�/STA para%+16        \Set header detect byte
�
LDA #5
�
STA para%
�LDA #18
�STA para%+1
�LDA para%-4
STA para%+2

LDA #0
STA para%+3
$LDA #&3F
.STA para%+4
8LDA #&7F
BSTA para%+5
LLDA #(para% � 256)
VSTA para%+6
`LDA #(para% � 256)
jSTA para%+7
tHJSR ttx_command     \Get page 100 from CEEFAX (BBC-1) or 200 (BBC-2)
~JLDA #&FF            \Set "give up looking for header" threshold byte 1
�STA para%-1
�#LDA #&3F            \Set byte 2
�STA para%-2
�.test_for_header
�LDA para%+16
�0BNE get_time        \Check if header arrived
�;LDY #0              \If not, wait a bit then test again
�	.wait
�NOP
�DEY
�BNE wait
�DEC para%-1
BNE test_for_header

DEC para%-2
BNE test_for_header
JSR exit
(BRK
2EQUB 52
<EQUS "Can't find time/date"
FBRK
P
.get_time
Z\LDA #14
d\STA para%
nK\JSR ttx_command      \Clear page grabber so it doesn't over-write data
x.try_again
�LDA #21
�
STA para%
�,JSR ttx_command      \Get time from TSDP
�LDA para%+10
�3CMP #&FF             \Test to see if time found
�&BEQ try_again        \Retry if not
�JJSR delay            \1 second delay to bodge CMOS set routine to give
�(JSR delay            \correct result
�
JSR delay
�
LDA #8
�
STA para%
�LDA #&F
�LDX #para% � 256
LDY #para% � 256
0JSR osword           \Set time in CMOS clock

.get_date
"LDA #22
,
STA para%
6EJSR ttx_command      \Get date from TSDP (Only year will be used)
@LDA para%+12
J4CMP #&FF             \Check to see if date found
T'BEQ get_date         \Retry if not.
^FLDY #&7              \Move year to correct pos. in parameter block
hLDX #&21
r
.nextchar
|LDA para%,Y
�STA para%,X
�INY
�INX
�CPX #&25
�BNE nextchar
�LDA #�(",")
�0STA para%+&19        \Insert comma after day
�LDA #�(" ")
�=STA para%+&20        \Insert space between month and year
�JLDY #&16             \Then ensure the rest of the date is STANDARD �II
�	.next
�LDA para%,Y
�
� #&7F
�STA para%,Y
�INY
CPY #&26
BNE next
LDA #&F
&STA para%+&15
0LDA #&F
:LDX #(para%+&15) � 256
DLDY #(para%+&15) � 256
N+JSR osword           \Set CMOS calender
XLDX #(time � 256)
bLDY #(time � 256)
l$JSR oscli            \Perform *�
vH.exit                \Reset previous values, switch off ttx and exit
�
LDA #7
�
STA para%
�LDA #30
�STA para%+1
�:JSR ttx_command      \Reset no. of rows captured to 30
�\LDA #14
�\STA para%
�-\JSR ttx_command      \Clear page grabber
�LDA #12
�
STA para%
�8JSR ttx_command      \Switch off Teletext interrupts
�RTS
�/.ttx_command         \Ttx OSWORD subroutine
LDA #&7A
LDX #para% � 256
LDY #para% � 256
 JSR osword
*RTS
4D.delay               \Does nothing for about a third of a second
>LDX #&FF
HLDY #&FF
R.delay_loop
\DEY
fNOP:NOP
pBNE delay_loop
zDEX
�BNE delay_loop
�RTS
�	.time
�EQUS "TI."
�EQUB &D
�.tel
�
EQUS "B."
�EQUB &D
�]
�� pass%
��
�:
�� �instructions
	:
	�
	*� �141�130"     Setclock Instructions"
	$*� �141�130"     Setclock Instructions"
	.�28,0,23,39,3
	8/� "SETCLOCK gets the date and time from   "
	B/� "CEEFAX and sets the Master's internal  "
	L/� "CMOS calender/clock. It uses BBC-1 by  "
	V/� "default but, if it cannot find any     "
	`/� "Teletext on BBC-1, it will try BBC-2.  "
	j/� "It is, of course, only of value to     "
	t*� "users of the Master and so use has"
	~/� "been made of facilities provided only  "
	�/� "on that machine. The program uses      "
	�/� "OSWORD routines provided by the new BBC"
	�/� "ATS ROM. It is not compatible with TFS."
	�/� "   This Basic program will generate the"
	�/� "machine code routine SETCLOCK. You will"
	�/� "be able to choose where it will run in "
	�/� "memory. The filename given to the code "
	�/� "will depend on the filing system you   "
	�,� "are using at the moment, as will the"
	�-� "choice of assembly addresses offered."
	�
�space
	�/� "The best address for most users will be"
/� "&B00. This is Econet workspace and will"

/� "be unused in the majority of cases. If "
/� "you are using the network facility then"
/� "&900 is probably the best place to put "
(/� "the routine. This is the cassette/RS423"
2/� "input/output area. It's also used by   "
</� "sound envelopes 5-16 and any speech    "
F/� "upgrade which may be present. If these "
P/� "two alternatives don't suit you may    "
Z/� "assemble the routine to run anywhere   "
d/� "but don't expect sensible results if   "
n/� "you put it somewhere daft.             "
x
�space
�/� "Disc users should keep the program in  "
�/� "the current directory or library and   "
�/� "call it with *<filename>. Tape users   "
�!� "should use *RUN SETCLOCK."
�/� '"   Error messages will be given if the"
�/� "clock cannot be reset. The routine can "
�/� "be re-run using CALL &<address> if you "
�/� "wish. This may be useful if you are    "
�� "using tape."
�/� '"   If the clock has been correctly    "
�/� "reset a *TIME command is issued        "
�/� "resulting in the contents of the CMOS  "
�/� "clock being printed out as usual.      "

�space
+� "The next part of this program is a "
/� "demonstration of SETCLOCK. The CMOS    "
"/� "clock can be scrambled and then reset  "
,/� "from CEEFAX. (Follow on-screen         "
6� "instructions.)"
@/� '"  The CEEFAX header is displayed for  "
J/� "reference throughout the demonstration."
T/� "Do not be put off by the way the CMOS  "
^/� "clock appears to lead CEEFAX. SETCLOCK "
h/� "uses the Television Service Data Packet"
r/� "to set the clock and is more accurate  "
|/� "than the header.                       "
�
�space
�/� '"  To leave the demonstration press f2."
�/� "Then follow the directions to generate "
�/� "SETCLOCK itself and save it to your    "
�/� "current filing system. If you are using"
�/� "the ROM filing system or TFS the       "
�/� "program will not be saved.             "
�/� '"  The program contains many notes so  "
�/� "you should be able to adapt it. Any    "
�/� "comments would be welcome via PRESTEL  "
�� "mailbox 012373797."
�
�space
��
:
� �space
:
&-� �5,19)�131"Press SPACE BAR to continue"
0� � �(-99)
:	*FX15
D�
N�
X:
b� �demo
l:
v� � �error:�
��26
��
�� �0,0)�134"SCLOCK";�135;
�
*TTXON
�*HON
�*FX225,240
�
�c_off
�+� �6,2)�141�131"Setclock demonstration"
�)� �6)�141�131"Setclock demonstration"
�&� �9,7)�141�133"CMOS Clock reads:"
�$� �9)�141�133"CMOS Clock reads:"
�red$=�129+�157+�135
�black$=�156

(� �1,20)red$;"f0  ";black$;"      ";

"� red$;"f1  ";black$;"      ";

� red$;"f2  ";black$

 0� '�2)"Reset";�15)"Scramble";�29)"Exit demo"

*�

4	*FX15

>�update_time

H� A=240 � �setclock

R� A=241 � �unset

\� A=242

f	*HOFF

p*TTXOFF

z*FX225,1

��26

�	� � �

��

�:

�� �unset

�:

�!�$="Sat,14 Mar 1982.10:10:10"

��

�:

�� �c_off

�:

��23,1,0;0;0;0;0;

��
:
� �c_on
:
$�23,1,1;0;0;0;0;
.�
8:
B� �update_time
L:
V�
`� �5,9)�141�134;�$
j� �5)�141�134;�$
t
� �(-1)>0
~A=�
��
�:
�� �setclock
�:
�-� �7,5)red$;"SETTING CMOS CLOCK  ";black$
�/� �5,13)�141�130"CMOS Clock last reset at:"
�-� �5)�141�130"CMOS Clock last reset at:"'
�� �131"      ";
�� &7000
�
*TTXON
�� �6,5);�(30);
��
:

� �error
:
*TTXOFF
(� �=17 �:�
2/� �=&FF error$="Sorry, no Teletext adaptor"
</� �=50 error$="Sorry, adaptor switched off"
F/� �=51 error$="Sorry, not receiving CEEFAX"
P/� �=52 error$="Sorry, can't find date/time"
Zerror$=error$+"  "
d-� �18-(�(error$)/2),16)red$;error$;black$
n�28,0,22,39,19
x�
��26
�
�space
��collect_data
�	�save
��end
��
�:
�� �collect_data
�:
��
�!� �141�134�12)"Save SETCLOCK"
�!� �141�134�12)"Save SETCLOCK"
��28,0,22,39,3
file%=�file_sys
� file%=0 �nofile:�
� file%=1 � file%=2 �tape:�
"!� file%=3 � file%=6 �nosave:�
,� file%=4 �dfs:�
6#� file%=5 � file%=8 �net_adfs:�
@� file%=6 �tfs:�
J�
T:
^
� �nofile
h:
r2� "There is no filing system selected. Please"
|*� "select one and re-run the program."
��end
��
�:
�� �tape
�:
�<� file%=1 fs$="TAPE (1200 Baud)" � fs$="TAPE (300 Baud)"
�filename$="SETCLOCK"
�
�print_fs
��get_address
��
��0,5);�136�129;
��28,10,22,27,13
��
:

� �nosave
,� file%=3 fs$="ROM" � fs$="Telesoftware"
&*� "Sorry, you cannot save to the ";fs$
0-� '"filing system. Please select another"
:+� '"(e.g. disc or tape) and re-run the"
D� '"program."
N	�c_on
X�26
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l�
v�
�:
�
� �dfs
�:
�fs$="DISC (DFS)"
�filename$="SETCLK"
�
�print_fs
�/� �131"Please enter any prefix to filename"
�0� �131"(i.e. :1.W. to save file to drive 1,"
�+� �131"directory W.) Press <RETURN> to"
�� �131"finish entry."
�	�c_on
�%� ''�12)�134;:� "PREFIX: "prefix$
�
�c_off
:� �(prefix$)<>0 � �prefix$,1)<>"." prefix$=prefix$+"."
filename$=prefix$+filename$
�get_address
 �
*:
4� �net_adfs
>:
H/� file%=5 fs$="NETWORK" � fs$="DISC (ADFS)"
Rfilename$="SETCLOCK"
\
�print_fs
f.� �131"Please enter any pathname that you"
p-� �131"require added to the beginning of"
z+� �131"the filename. Press <RETURN> to"
�� �131"finish entry."
�	�c_on
�#� ''�134;:� "PATHNAME: "prefix$
�
�c_off
�:� �(prefix$)<>0 � �prefix$,1)<>"." prefix$=prefix$+"."
�filename$=prefix$+filename$
��get_address
��
�:
�� �print_fs
�:
�*� �131"Current filing system:"�135;fs$
�7� '�131"The program will be saved as"�135;filename$
�28,0,22,39,8
�
:
$� �get_address
.:
83� ''�130"  Where would you like the routine?"''
B=� file%>2 � �131"1. Serial/cassette port buffers (&900)"'
L(� '�131"2. Econet workspace (&B00)"'
V#� '�131"3. At another address"'
`�
jA=�
t/� (file%>2 � (A>48 � A<52)) � (A>49 � A<52)
~� A=49 address=&900:�
�� A=50 address=&B00:�
�� A=51 �user_address:�
��
�:
�� �user_address
��
�	�c_on
�2� '�131"Please enter the address you require:"
�� '�14)�134;"&";
�address=�hex_input
�
�c_off
��
:

� �hex_input
:
=�(hex_input) � &FFFF
(:
2� �hex_string(integer)
<:
FA%=integer � 256
PX%=integer � 256
Z� hex_string
d
=$hexaddr
n:
x� �file_sys
�:
�A%=0
�Y%=0
�=�(&FFDA) � &FF
�:
�� �save
�:
�!address$=�hex_string(address)
�E� ("SAVE "+filename$+" 7000 +200 FFFF"+address$+" FFFF"+address$)
��
�:
�
� �end
��26
�
0� '''�131"   The program has been saved as:"
*� '�19-(�(filename$)/2))�134;filename$
"5� ''�131"Don't forget to save THIS Basic program"
,0� �131"   too, it contains the source code!"
6� ''
@	�c_on
J�
T�
^:
h� �assemble_tools
r:
|� pass%=0 � 2 � 2
�P%=code%
�[OPT pass%
�.hex_string
�0STA &70           \Save bytes for future use
�STX &71
�
LDA #0
�2STA hexaddr       \Clear hex string to nothing
�STA hexaddr+1
�STA hexaddr+2
�STA hexaddr+3
�4LDA #&D           \Set <CR> at end of hex string
�STA hexaddr+4
�LDA &70
2� #&F           \Find lower nybble of low byte
/JSR convert       \Find �II value of nybble
&STA hexaddr+3     \Store in string
&TXA
03� #&F           \Find lower nybble of high byte
:JSR convert       \as above
DSTA hexaddr+1
N5LDA &70           \Find higher nybble of low byte
XLSR A:LSR A:LSR A:LSR A
bJSR convert       \as above
lSTA hexaddr+2
v6LDA &71           \Find higher nybble of high byte
�LSR A:LSR A:LSR A:LSR A
�JSR convert       \as above
�STA hexaddr
�RTS
�B.convert          \SUBROUTINE returns �II value of nybble in A
�1CMP #10           \Is nybble alpha? (i.e. >9)
�3BPL alpha         \If so, jump to alpha routine
�8CLC               \Otherwise add 48 to it and return
�ADC #48
�RTS
�<.alpha            \It's alpha so add 55 to it and return
�CLC
�ADC #55
RTS
.hex_input
3LDX #0           \Set character counter/pointer
 7.get_char        \get a character from input stream
*JSR osrdch
4,BCS error        \Trap invalid character
>CMP #13
H-BEQ end_entry    \Detect and act upon <�>
RCMP #127
\-BEQ delete       \Detect and act upon <�>
fHCMP #48          \Range check. Pass only 0-9 and A-E (no lower case)
pBMI beep
zCMP #71
�BPL beep
�CMP #58
�
BMI ok
�CMP #65
�BMI beep
�.ok
�?CPX #4           \Detect sneaky try at entering a 5th digit
�BEQ beep
�,STA hexaddr,X    \Add chracter to string
�,INX              \Update counter/pointer
�-JSR oswrch       \Put character on screen
�JMP get_char
�9.beep            \Make a beep and go back to get_char

LDA #7
JSR oswrch
JMP get_char
$'.error           \Jump out on error
.RTS
8$.delete          \Action <�> key
B
CPX #0
LCBEQ beep         \If nothing to delete, beep and go to get_char
V
LDA #8
`JSR oswrch
jLDA #32
tJSR oswrch
~
LDA #8
�JSR oswrch
�DEX
�JMP get_char
�-.end_entry       \Exit collection routine
�,CPX #4           \All 4 characters used?
�BEQ evaluate
�,CPX #0           \No characters entered?
�BEQ quick_exit
�4STX &70          \If not, pad with leading zeros
�
LDA #4
�SEC
�1SBC &70          \Find how many spaces to pad
STA &70

6DEX              \Change X from counter to pointer
TXA
CLC
(ADC &70
23TAY              \Set Y to point at target byte
<8.shift           \Shift valid chars to end of string
FLDA hexaddr,X
PSTA hexaddr,Y
ZDEY
dDEX
nBMI continue
x
JMP shift
�
.continue
�(LDY #0            \Add leading zeros
� LDA #48           \(�II "0")
�.pad
�STA hexaddr,Y
�INY
�CPY &70
�BNE pad
�9.evaluate        \Decode hex string to 2 byte integer
�LDA hexaddr+3
�*JSR decode       \Low nybble, low byte
�STA &70
�+LDA hexaddr+2    \high nybble, low byte
JSR decode
ASL A:ASL A:ASL A:ASL A
CLC
">ADC &70           \Add two nybbles together and store in Y
,TAY
6,LDA hexaddr+1     \Low nybble, high byte
@JSR decode
JSTA &70
T-LDA hexaddr       \High nybble, high byte
^JSR decode
hASL A:ASL A:ASL A:ASL A
rCLC
|>ADC &70           \Add two nybbles together and store in X
�TAX
�7TYA               \Move low byte back into A & exit
�RTS
�/.decode           \Nybble decode subroutine
�!CMP #58           \Is it > 9?
�BPL dec_alpha
�*SEC               \If not, subtract 48
�SBC #48
�RTS
�.dec_alpha
�4SEC               \If it is, subtract 55 (ALPHA)
�SBC #55
�RTS
E.quick_exit       \Used only if no characters entered (essential)

LDA #0
TAX
&RTS
0]
:� pass%
D�
N:
�
00000000  0d 00 0a 25 f4 20 53 45  54 43 4c 4f 43 4b 20 50  |...%. SETCLOCK P|
00000010  52 4f 47 52 41 4d 20 46  4f 52 20 4d 41 53 54 45  |ROGRAM FOR MASTE|
00000020  52 20 31 32 38 0d 00 14  19 f4 20 28 43 29 20 49  |R 128..... (C) I|
00000030  61 6e 20 53 74 75 62 62  73 20 31 39 38 36 0d 00  |an Stubbs 1986..|
00000040  1e 1a f4 20 52 45 51 55  49 52 45 53 20 42 42 43  |... REQUIRES BBC|
00000050  20 41 54 53 20 52 4f 4d  0d 00 28 05 3a 0d 00 32  | ATS ROM..(.:..2|
00000060  07 eb 20 37 0d 00 3c 0b  d3 3d 26 37 30 30 30 0d  |.. 7..<..=&7000.|
00000070  00 46 0f de 20 63 6f 64  65 25 20 32 38 30 0d 00  |.F.. code% 280..|
00000080  50 0f de 20 68 65 78 61  64 64 72 20 35 0d 00 5a  |P.. hexaddr 5..Z|
00000090  10 6f 73 61 73 63 69 3d  26 46 46 45 33 0d 00 64  |.osasci=&FFE3..d|
000000a0  10 6f 73 72 64 63 68 3d  26 46 46 45 30 0d 00 6e  |.osrdch=&FFE0..n|
000000b0  10 6f 73 77 72 63 68 3d  26 46 46 45 45 0d 00 78  |.oswrch=&FFEE..x|
000000c0  10 6f 73 62 79 74 65 3d  26 46 46 46 34 0d 00 82  |.osbyte=&FFF4...|
000000d0  10 6f 73 77 6f 72 64 3d  26 46 46 46 31 0d 00 8c  |.osword=&FFF1...|
000000e0  0f 6f 73 63 6c 69 3d 26  46 46 46 37 0d 00 96 13  |.oscli=&FFF7....|
000000f0  f2 61 73 73 65 6d 62 6c  65 5f 74 6f 6f 6c 73 0d  |.assemble_tools.|
00000100  00 a0 14 f2 61 73 73 65  6d 62 6c 65 28 26 37 30  |....assemble(&70|
00000110  30 30 29 0d 00 aa 11 f2  69 6e 73 74 72 75 63 74  |00).....instruct|
00000120  69 6f 6e 73 0d 00 b4 09  f2 64 65 6d 6f 0d 00 be  |ions.....demo...|
00000130  11 f2 63 6f 6c 6c 65 63  74 5f 64 61 74 61 0d 00  |..collect_data..|
00000140  c8 16 f2 61 73 73 65 6d  62 6c 65 28 61 64 64 72  |...assemble(addr|
00000150  65 73 73 29 0d 00 d2 09  f2 73 61 76 65 0d 00 dc  |ess).....save...|
00000160  08 f2 65 6e 64 0d 00 e6  05 3a 0d 00 f0 10 f4 20  |..end....:..... |
00000170  50 52 4f 43 45 44 55 52  45 53 0d 00 fa 05 3a 0d  |PROCEDURES....:.|
00000180  01 04 17 dd 20 f2 61 73  73 65 6d 62 6c 65 28 6f  |.... .assemble(o|
00000190  72 69 67 69 6e 29 0d 01  0e 05 3a 0d 01 18 15 70  |rigin)....:....p|
000001a0  61 72 61 25 3d 6f 72 69  67 69 6e 2b 26 31 45 30  |ara%=origin+&1E0|
000001b0  0d 01 22 15 e3 20 70 61  73 73 25 3d 34 20 b8 20  |..".. pass%=4 . |
000001c0  36 20 88 20 32 0d 01 2c  0d 50 25 3d 6f 72 69 67  |6 . 2..,.P%=orig|
000001d0  69 6e 0d 01 36 0c 4f 25  3d 26 37 30 30 30 0d 01  |in..6.O%=&7000..|
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00003910  5f 65 6e 74 72 79 20 20  20 20 20 20 20 5c 45 78  |_entry       \Ex|
00003920  69 74 20 63 6f 6c 6c 65  63 74 69 6f 6e 20 72 6f  |it collection ro|
00003930  75 74 69 6e 65 0d 18 b0  2c 43 50 58 20 23 34 20  |utine...,CPX #4 |
00003940  20 20 20 20 20 20 20 20  20 20 5c 41 6c 6c 20 34  |          \All 4|
00003950  20 63 68 61 72 61 63 74  65 72 73 20 75 73 65 64  | characters used|
00003960  3f 0d 18 ba 10 42 45 51  20 65 76 61 6c 75 61 74  |?....BEQ evaluat|
00003970  65 0d 18 c4 2c 43 50 58  20 23 30 20 20 20 20 20  |e...,CPX #0     |
00003980  20 20 20 20 20 20 5c 4e  6f 20 63 68 61 72 61 63  |      \No charac|
00003990  74 65 72 73 20 65 6e 74  65 72 65 64 3f 0d 18 ce  |ters entered?...|
000039a0  12 42 45 51 20 71 75 69  63 6b 5f 65 78 69 74 0d  |.BEQ quick_exit.|
000039b0  18 d8 34 53 54 58 20 26  37 30 20 20 20 20 20 20  |..4STX &70      |
000039c0  20 20 20 20 5c 49 66 20  6e 6f 74 2c 20 70 61 64  |    \If not, pad|
000039d0  20 77 69 74 68 20 6c 65  61 64 69 6e 67 20 7a 65  | with leading ze|
000039e0  72 6f 73 0d 18 e2 0a 4c  44 41 20 23 34 0d 18 ec  |ros....LDA #4...|
000039f0  07 53 45 43 0d 18 f6 31  53 42 43 20 26 37 30 20  |.SEC...1SBC &70 |
00003a00  20 20 20 20 20 20 20 20  20 5c 46 69 6e 64 20 68  |         \Find h|
00003a10  6f 77 20 6d 61 6e 79 20  73 70 61 63 65 73 20 74  |ow many spaces t|
00003a20  6f 20 70 61 64 0d 19 00  0b 53 54 41 20 26 37 30  |o pad....STA &70|
00003a30  0d 19 0a 36 44 45 58 20  20 20 20 20 20 20 20 20  |...6DEX         |
00003a40  20 20 20 20 20 5c 43 68  61 6e 67 65 20 58 20 66  |     \Change X f|
00003a50  72 6f 6d 20 63 6f 75 6e  74 65 72 20 74 6f 20 70  |rom counter to p|
00003a60  6f 69 6e 74 65 72 0d 19  14 07 54 58 41 0d 19 1e  |ointer....TXA...|
00003a70  07 43 4c 43 0d 19 28 0b  41 44 43 20 26 37 30 0d  |.CLC..(.ADC &70.|
00003a80  19 32 33 54 41 59 20 20  20 20 20 20 20 20 20 20  |.23TAY          |
00003a90  20 20 20 20 5c 53 65 74  20 59 20 74 6f 20 70 6f  |    \Set Y to po|
00003aa0  69 6e 74 20 61 74 20 74  61 72 67 65 74 20 62 79  |int at target by|
00003ab0  74 65 0d 19 3c 38 2e 73  68 69 66 74 20 20 20 20  |te..<8.shift    |
00003ac0  20 20 20 20 20 20 20 5c  53 68 69 66 74 20 76 61  |       \Shift va|
00003ad0  6c 69 64 20 63 68 61 72  73 20 74 6f 20 65 6e 64  |lid chars to end|
00003ae0  20 6f 66 20 73 74 72 69  6e 67 0d 19 46 11 4c 44  | of string..F.LD|
00003af0  41 20 68 65 78 61 64 64  72 2c 58 0d 19 50 11 53  |A hexaddr,X..P.S|
00003b00  54 41 20 68 65 78 61 64  64 72 2c 59 0d 19 5a 07  |TA hexaddr,Y..Z.|
00003b10  44 45 59 0d 19 64 07 44  45 58 0d 19 6e 10 42 4d  |DEY..d.DEX..n.BM|
00003b20  49 20 63 6f 6e 74 69 6e  75 65 0d 19 78 0d 4a 4d  |I continue..x.JM|
00003b30  50 20 73 68 69 66 74 0d  19 82 0d 2e 63 6f 6e 74  |P shift.....cont|
00003b40  69 6e 75 65 0d 19 8c 28  4c 44 59 20 23 30 20 20  |inue...(LDY #0  |
00003b50  20 20 20 20 20 20 20 20  20 20 5c 41 64 64 20 6c  |          \Add l|
00003b60  65 61 64 69 6e 67 20 7a  65 72 6f 73 0d 19 96 20  |eading zeros... |
00003b70  4c 44 41 20 23 34 38 20  20 20 20 20 20 20 20 20  |LDA #48         |
00003b80  20 20 5c 28 97 49 49 20  22 30 22 29 0d 19 a0 08  |  \(.II "0")....|
00003b90  2e 70 61 64 0d 19 aa 11  53 54 41 20 68 65 78 61  |.pad....STA hexa|
00003ba0  64 64 72 2c 59 0d 19 b4  07 49 4e 59 0d 19 be 0b  |ddr,Y....INY....|
00003bb0  43 50 59 20 26 37 30 0d  19 c8 0b 42 4e 45 20 70  |CPY &70....BNE p|
00003bc0  61 64 0d 19 d2 39 2e 65  76 61 6c 75 61 74 65 20  |ad...9.evaluate |
00003bd0  20 20 20 20 20 20 20 5c  44 65 63 6f 64 65 20 68  |       \Decode h|
00003be0  65 78 20 73 74 72 69 6e  67 20 74 6f 20 32 20 62  |ex string to 2 b|
00003bf0  79 74 65 20 69 6e 74 65  67 65 72 0d 19 dc 11 4c  |yte integer....L|
00003c00  44 41 20 68 65 78 61 64  64 72 2b 33 0d 19 e6 2a  |DA hexaddr+3...*|
00003c10  4a 53 52 20 64 65 63 6f  64 65 20 20 20 20 20 20  |JSR decode      |
00003c20  20 5c 4c 6f 77 20 6e 79  62 62 6c 65 2c 20 6c 6f  | \Low nybble, lo|
00003c30  77 20 62 79 74 65 0d 19  f0 0b 53 54 41 20 26 37  |w byte....STA &7|
00003c40  30 0d 19 fa 2b 4c 44 41  20 68 65 78 61 64 64 72  |0...+LDA hexaddr|
00003c50  2b 32 20 20 20 20 5c 68  69 67 68 20 6e 79 62 62  |+2    \high nybb|
00003c60  6c 65 2c 20 6c 6f 77 20  62 79 74 65 0d 1a 04 0e  |le, low byte....|
00003c70  4a 53 52 20 64 65 63 6f  64 65 0d 1a 0e 1b 41 53  |JSR decode....AS|
00003c80  4c 20 41 3a 41 53 4c 20  41 3a 41 53 4c 20 41 3a  |L A:ASL A:ASL A:|
00003c90  41 53 4c 20 41 0d 1a 18  07 43 4c 43 0d 1a 22 3e  |ASL A....CLC..">|
00003ca0  41 44 43 20 26 37 30 20  20 20 20 20 20 20 20 20  |ADC &70         |
00003cb0  20 20 5c 41 64 64 20 74  77 6f 20 6e 79 62 62 6c  |  \Add two nybbl|
00003cc0  65 73 20 74 6f 67 65 74  68 65 72 20 61 6e 64 20  |es together and |
00003cd0  73 74 6f 72 65 20 69 6e  20 59 0d 1a 2c 07 54 41  |store in Y..,.TA|
00003ce0  59 0d 1a 36 2c 4c 44 41  20 68 65 78 61 64 64 72  |Y..6,LDA hexaddr|
00003cf0  2b 31 20 20 20 20 20 5c  4c 6f 77 20 6e 79 62 62  |+1     \Low nybb|
00003d00  6c 65 2c 20 68 69 67 68  20 62 79 74 65 0d 1a 40  |le, high byte..@|
00003d10  0e 4a 53 52 20 64 65 63  6f 64 65 0d 1a 4a 0b 53  |.JSR decode..J.S|
00003d20  54 41 20 26 37 30 0d 1a  54 2d 4c 44 41 20 68 65  |TA &70..T-LDA he|
00003d30  78 61 64 64 72 20 20 20  20 20 20 20 5c 48 69 67  |xaddr       \Hig|
00003d40  68 20 6e 79 62 62 6c 65  2c 20 68 69 67 68 20 62  |h nybble, high b|
00003d50  79 74 65 0d 1a 5e 0e 4a  53 52 20 64 65 63 6f 64  |yte..^.JSR decod|
00003d60  65 0d 1a 68 1b 41 53 4c  20 41 3a 41 53 4c 20 41  |e..h.ASL A:ASL A|
00003d70  3a 41 53 4c 20 41 3a 41  53 4c 20 41 0d 1a 72 07  |:ASL A:ASL A..r.|
00003d80  43 4c 43 0d 1a 7c 3e 41  44 43 20 26 37 30 20 20  |CLC..|>ADC &70  |
00003d90  20 20 20 20 20 20 20 20  20 5c 41 64 64 20 74 77  |         \Add tw|
00003da0  6f 20 6e 79 62 62 6c 65  73 20 74 6f 67 65 74 68  |o nybbles togeth|
00003db0  65 72 20 61 6e 64 20 73  74 6f 72 65 20 69 6e 20  |er and store in |
00003dc0  58 0d 1a 86 07 54 41 58  0d 1a 90 37 54 59 41 20  |X....TAX...7TYA |
00003dd0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 5c 4d  |              \M|
00003de0  6f 76 65 20 6c 6f 77 20  62 79 74 65 20 62 61 63  |ove low byte bac|
00003df0  6b 20 69 6e 74 6f 20 41  20 26 20 65 78 69 74 0d  |k into A & exit.|
00003e00  1a 9a 07 52 54 53 0d 1a  a4 2f 2e 64 65 63 6f 64  |...RTS.../.decod|
00003e10  65 20 20 20 20 20 20 20  20 20 20 20 5c 4e 79 62  |e           \Nyb|
00003e20  62 6c 65 20 64 65 63 6f  64 65 20 73 75 62 72 6f  |ble decode subro|
00003e30  75 74 69 6e 65 0d 1a ae  21 43 4d 50 20 23 35 38  |utine...!CMP #58|
00003e40  20 20 20 20 20 20 20 20  20 20 20 5c 49 73 20 69  |           \Is i|
00003e50  74 20 3e 20 39 3f 0d 1a  b8 11 42 50 4c 20 64 65  |t > 9?....BPL de|
00003e60  63 5f 61 6c 70 68 61 0d  1a c2 2a 53 45 43 20 20  |c_alpha...*SEC  |
00003e70  20 20 20 20 20 20 20 20  20 20 20 20 20 5c 49 66  |             \If|
00003e80  20 6e 6f 74 2c 20 73 75  62 74 72 61 63 74 20 34  | not, subtract 4|
00003e90  38 0d 1a cc 0b 53 42 43  20 23 34 38 0d 1a d6 07  |8....SBC #48....|
00003ea0  52 54 53 0d 1a e0 0e 2e  64 65 63 5f 61 6c 70 68  |RTS.....dec_alph|
00003eb0  61 0d 1a ea 34 53 45 43  20 20 20 20 20 20 20 20  |a...4SEC        |
00003ec0  20 20 20 20 20 20 20 5c  49 66 20 69 74 20 69 73  |       \If it is|
00003ed0  2c 20 73 75 62 74 72 61  63 74 20 35 35 20 28 41  |, subtract 55 (A|
00003ee0  4c 50 48 41 29 0d 1a f4  0b 53 42 43 20 23 35 35  |LPHA)....SBC #55|
00003ef0  0d 1a fe 07 52 54 53 0d  1b 08 45 2e 71 75 69 63  |....RTS...E.quic|
00003f00  6b 5f 65 78 69 74 20 20  20 20 20 20 20 5c 55 73  |k_exit       \Us|
00003f10  65 64 20 6f 6e 6c 79 20  69 66 20 6e 6f 20 63 68  |ed only if no ch|
00003f20  61 72 61 63 74 65 72 73  20 65 6e 74 65 72 65 64  |aracters entered|
00003f30  20 28 65 73 73 65 6e 74  69 61 6c 29 0d 1b 12 0a  | (essential)....|
00003f40  4c 44 41 20 23 30 0d 1b  1c 07 54 41 58 0d 1b 26  |LDA #0....TAX..&|
00003f50  07 52 54 53 0d 1b 30 05  5d 0d 1b 3a 0b ed 20 70  |.RTS..0.]..:.. p|
00003f60  61 73 73 25 0d 1b 44 05  e1 0d 1b 4e 05 3a 0d ff  |ass%..D....N.:..|
00003f70
22-07-88/CLKSET.m0
22-07-88/CLKSET.m1
22-07-88/CLKSET.m2
22-07-88/CLKSET.m4
22-07-88/CLKSET.m5