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V/+2NDPO2
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 » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_56.ADF |
| Filename: | V/+2NDPO2 |
| Read OK: | ✔ |
| File size: | 0FCF bytes |
| Load address: | 2B204556 |
| Exec address: | 50444E32 |
Duplicates
There are 2 duplicate copies of this file in the archive:
- AEW website » eug » eug_3_5_discs_Eug-56_A-EUG56.adf » V/+2NDPO2
- AEW website » eug » eug_5_25_discs_Eug-56_D-EUG56.dsd » V.+2NDPO2
- Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_56.ADF » V/+2NDPO2
File contents
[ MANUAL FOR 2ND SERIAL PORT - CONTINUATION ]
Supported FX Calls
WHEN preceded by a *COM2 command, the following OSBytes are listened for
by the second serial card firmware. You may either type them directly at
the command line with *FX or by calling the OSByte routine from your
programs.
For calls with A > 165 the operation performed is:
<newvalue> = (<oldvalue> AND Y> EOR X
and returns with: A = preserved, X = <oldvalue>, Y = undefined
FX 2 (Select input stream)
*FX 2, 0 disables RS423 input interrupts
*FX 2, 2 enables RS423 input interrupts
Note that to read or write bytes from the serial port you must use
OSByte 138 to insert bytes into the output buffer and OSByte 145
to get bytes from the input buffer, you cannot use *FX 2, 1 and
*FX 3, 7 to redirect keyboard and screen activity to te port as
this only works with the built in serial interface.
FX 7 (Set receive rate)
Rates between 75 and 19200 baud are possible. This call returns
with the X and Y register set to the old ULA contents (See *FX 242
below). The default, set with *FX 7, 0 is 9600 baud.
FX 8 (Set transmit rate)
Rates between 75 and 19200 baud are possible. This call returns
with the X and Y register set to the old ULA contents (See *FX 242
below). The default, set with *FX 8, 0 is 9600 baud.
FX 156 (Read/write 6850 control register plus OS copy)
This call writes to the control register of the 6850 chip and the
OS copy. By consulting the 6850 data sheet, it is possible to im-
plement serial standards other than the "8N1" default.
The action of this OSByte is:
<register> = (<oldregister> AND Y) EOR X
returning with X = <oldregister> and A, Y preserved.
FX 181 (Determine action on receiving escape/soft key)
Unimplemented. No expansion of escape or soft keys occur.
FX 191 (Read/write RS423 in use flag)
This call tests whether the RS423 hardware is busy, returning with
bit 7 set if it is free, bits 0 to 6 are undefined. Value 'busy'
means that either transmit or receive interrupts are enabled,
writes to this location are ignored.
FX 191 (Read/write 6850 control register OS copy only)
This call reads or writes the OS copy of the control register on
the 6850 chip. Do not write to this location as it would make the
copy inconsistent with the value in the chip.
FX 203 (Read/write input buffer handshake ceiling)
If the number of free bytes in the input buffer falls below the
number held in this location the RTS line will go high to stop any
further bytes being sent from the other computer.
It contains 9 by default on soft and hard resets.
FX 204 (Read/write serial suppression flag)
Unimplemented. The second serial card RS423 input cannot be
suppressed.
FX 205 (Read/write hardware use flag)
This location contains &00 if the hardware is used in RS423 data
mode &40 if the hardware is used in cassette mode. It will always
contain 0 for the second serial card.
FX 232 (Read/write IRQ mask)
Unimplemented. The IRQ mask is always 255, and handled internally.
FX 242 (Read/write serial ULA register OS copy only)
This call reads or writes the second serial card's serial ULA. The
byte is set out as %msrrrtttm where:
m=motor relay state (always 0, there is no relay on the card)
s=system select (always 1, the card is always in RS423 mode)
rrr=receive baud rate (see table)
ttt=transmit baud rate (see table)
The baud rates read from the ULA are:
%000 = 19200 %001 = 1200
%100 = 9600 %101 = 300
%010 = 4800 %011 = 150
%110 = 2400 %111 = 75
Do not write to this location as it would make the copy inconsis-
tent with the value in the ULA.
Robert Sprowson, EUG #56
00000000 20 20 20 20 20 20 20 20 20 20 20 20 20 5b 20 4d | [ M| 00000010 41 4e 55 41 4c 20 46 4f 52 20 32 4e 44 20 53 45 |ANUAL FOR 2ND SE| 00000020 52 49 41 4c 20 50 4f 52 54 20 2d 20 43 4f 4e 54 |RIAL PORT - CONT| 00000030 49 4e 55 41 54 49 4f 4e 20 5d 0d 0d 53 75 70 70 |INUATION ]..Supp| 00000040 6f 72 74 65 64 20 46 58 20 43 61 6c 6c 73 0d 57 |orted FX Calls.W| 00000050 48 45 4e 20 70 72 65 63 65 64 65 64 20 62 79 20 |HEN preceded by | 00000060 61 20 2a 43 4f 4d 32 20 63 6f 6d 6d 61 6e 64 2c |a *COM2 command,| 00000070 20 74 68 65 20 66 6f 6c 6c 6f 77 69 6e 67 20 4f | the following O| 00000080 53 42 79 74 65 73 20 61 72 65 20 6c 69 73 74 65 |SBytes are liste| 00000090 6e 65 64 20 66 6f 72 0d 62 79 20 74 68 65 20 73 |ned for.by the s| 000000a0 65 63 6f 6e 64 20 73 65 72 69 61 6c 20 63 61 72 |econd serial car| 000000b0 64 20 66 69 72 6d 77 61 72 65 2e 20 59 6f 75 20 |d firmware. You | 000000c0 6d 61 79 20 65 69 74 68 65 72 20 74 79 70 65 20 |may either type | 000000d0 74 68 65 6d 20 64 69 72 65 63 74 6c 79 20 61 74 |them directly at| 000000e0 0d 74 68 65 20 63 6f 6d 6d 61 6e 64 20 6c 69 6e |.the command lin| 000000f0 65 20 77 69 74 68 20 2a 46 58 20 6f 72 20 62 79 |e with *FX or by| 00000100 20 63 61 6c 6c 69 6e 67 20 74 68 65 20 4f 53 42 | calling the OSB| 00000110 79 74 65 20 72 6f 75 74 69 6e 65 20 66 72 6f 6d |yte routine from| 00000120 20 79 6f 75 72 20 0d 70 72 6f 67 72 61 6d 73 2e | your .programs.| 00000130 20 0d 20 20 20 46 6f 72 20 63 61 6c 6c 73 20 77 | . For calls w| 00000140 69 74 68 20 41 20 3e 20 31 36 35 20 74 68 65 20 |ith A > 165 the | 00000150 6f 70 65 72 61 74 69 6f 6e 20 70 65 72 66 6f 72 |operation perfor| 00000160 6d 65 64 20 69 73 3a 0d 3c 6e 65 77 76 61 6c 75 |med is:.<newvalu| 00000170 65 3e 20 3d 20 28 3c 6f 6c 64 76 61 6c 75 65 3e |e> = (<oldvalue>| 00000180 20 41 4e 44 20 59 3e 20 45 4f 52 20 58 0d 0d 61 | AND Y> EOR X..a| 00000190 6e 64 20 72 65 74 75 72 6e 73 20 77 69 74 68 3a |nd returns with:| 000001a0 20 20 41 20 3d 20 70 72 65 73 65 72 76 65 64 2c | A = preserved,| 000001b0 20 58 20 3d 20 3c 6f 6c 64 76 61 6c 75 65 3e 2c | X = <oldvalue>,| 000001c0 20 59 20 3d 20 75 6e 64 65 66 69 6e 65 64 0d 0d | Y = undefined..| 000001d0 20 20 20 46 58 20 32 20 28 53 65 6c 65 63 74 20 | FX 2 (Select | 000001e0 69 6e 70 75 74 20 73 74 72 65 61 6d 29 0d 20 20 |input stream). | 000001f0 20 20 20 20 2a 46 58 20 32 2c 20 30 20 64 69 73 | *FX 2, 0 dis| 00000200 61 62 6c 65 73 20 52 53 34 32 33 20 69 6e 70 75 |ables RS423 inpu| 00000210 74 20 69 6e 74 65 72 72 75 70 74 73 0d 20 20 20 |t interrupts. | 00000220 20 20 20 2a 46 58 20 32 2c 20 32 20 65 6e 61 62 | *FX 2, 2 enab| 00000230 6c 65 73 20 52 53 34 32 33 20 69 6e 70 75 74 20 |les RS423 input | 00000240 69 6e 74 65 72 72 75 70 74 73 0d 20 20 20 20 20 |interrupts. | 00000250 20 4e 6f 74 65 20 74 68 61 74 20 74 6f 20 72 65 | Note that to re| 00000260 61 64 20 6f 72 20 77 72 69 74 65 20 62 79 74 65 |ad or write byte| 00000270 73 20 66 72 6f 6d 20 74 68 65 20 73 65 72 69 61 |s from the seria| 00000280 6c 20 70 6f 72 74 20 79 6f 75 20 6d 75 73 74 20 |l port you must | 00000290 75 73 65 0d 20 20 20 20 20 20 4f 53 42 79 74 65 |use. OSByte| 000002a0 20 31 33 38 20 74 6f 20 69 6e 73 65 72 74 20 62 | 138 to insert b| 000002b0 79 74 65 73 20 69 6e 74 6f 20 74 68 65 20 6f 75 |ytes into the ou| 000002c0 74 70 75 74 20 62 75 66 66 65 72 20 61 6e 64 20 |tput buffer and | 000002d0 4f 53 42 79 74 65 20 31 34 35 0d 20 20 20 20 20 |OSByte 145. | 000002e0 20 74 6f 20 67 65 74 20 62 79 74 65 73 20 66 72 | to get bytes fr| 000002f0 6f 6d 20 74 68 65 20 69 6e 70 75 74 20 62 75 66 |om the input buf| 00000300 66 65 72 2c 20 79 6f 75 20 63 61 6e 6e 6f 74 20 |fer, you cannot | 00000310 75 73 65 20 2a 46 58 20 32 2c 20 31 20 61 6e 64 |use *FX 2, 1 and| 00000320 0d 20 20 20 20 20 20 2a 46 58 20 33 2c 20 37 20 |. *FX 3, 7 | 00000330 74 6f 20 72 65 64 69 72 65 63 74 20 6b 65 79 62 |to redirect keyb| 00000340 6f 61 72 64 20 61 6e 64 20 73 63 72 65 65 6e 20 |oard and screen | 00000350 61 63 74 69 76 69 74 79 20 74 6f 20 74 65 20 70 |activity to te p| 00000360 6f 72 74 20 61 73 20 0d 20 20 20 20 20 20 74 68 |ort as . th| 00000370 69 73 20 6f 6e 6c 79 20 77 6f 72 6b 73 20 77 69 |is only works wi| 00000380 74 68 20 74 68 65 20 62 75 69 6c 74 20 69 6e 20 |th the built in | 00000390 73 65 72 69 61 6c 20 69 6e 74 65 72 66 61 63 65 |serial interface| 000003a0 2e 0d 0d 20 20 20 46 58 20 37 20 28 53 65 74 20 |... FX 7 (Set | 000003b0 72 65 63 65 69 76 65 20 72 61 74 65 29 0d 20 20 |receive rate). | 000003c0 20 20 20 20 52 61 74 65 73 20 62 65 74 77 65 65 | Rates betwee| 000003d0 6e 20 37 35 20 61 6e 64 20 31 39 32 30 30 20 62 |n 75 and 19200 b| 000003e0 61 75 64 20 61 72 65 20 70 6f 73 73 69 62 6c 65 |aud are possible| 000003f0 2e 20 54 68 69 73 20 63 61 6c 6c 20 72 65 74 75 |. This call retu| 00000400 72 6e 73 0d 20 20 20 20 20 20 77 69 74 68 20 74 |rns. with t| 00000410 68 65 20 58 20 61 6e 64 20 59 20 72 65 67 69 73 |he X and Y regis| 00000420 74 65 72 20 73 65 74 20 74 6f 20 74 68 65 20 6f |ter set to the o| 00000430 6c 64 20 55 4c 41 20 63 6f 6e 74 65 6e 74 73 20 |ld ULA contents | 00000440 28 53 65 65 20 2a 46 58 20 32 34 32 0d 20 20 20 |(See *FX 242. | 00000450 20 20 20 62 65 6c 6f 77 29 2e 20 54 68 65 20 64 | below). The d| 00000460 65 66 61 75 6c 74 2c 20 73 65 74 20 77 69 74 68 |efault, set with| 00000470 20 2a 46 58 20 37 2c 20 30 20 69 73 20 39 36 30 | *FX 7, 0 is 960| 00000480 30 20 62 61 75 64 2e 0d 0d 20 20 20 46 58 20 38 |0 baud... FX 8| 00000490 20 28 53 65 74 20 74 72 61 6e 73 6d 69 74 20 72 | (Set transmit r| 000004a0 61 74 65 29 0d 20 20 20 20 20 20 52 61 74 65 73 |ate). Rates| 000004b0 20 62 65 74 77 65 65 6e 20 37 35 20 61 6e 64 20 | between 75 and | 000004c0 31 39 32 30 30 20 62 61 75 64 20 61 72 65 20 70 |19200 baud are p| 000004d0 6f 73 73 69 62 6c 65 2e 20 54 68 69 73 20 63 61 |ossible. This ca| 000004e0 6c 6c 20 72 65 74 75 72 6e 73 20 0d 20 20 20 20 |ll returns . | 000004f0 20 20 77 69 74 68 20 74 68 65 20 58 20 61 6e 64 | with the X and| 00000500 20 59 20 72 65 67 69 73 74 65 72 20 73 65 74 20 | Y register set | 00000510 74 6f 20 74 68 65 20 6f 6c 64 20 55 4c 41 20 63 |to the old ULA c| 00000520 6f 6e 74 65 6e 74 73 20 28 53 65 65 20 2a 46 58 |ontents (See *FX| 00000530 20 32 34 32 0d 20 20 20 20 20 20 62 65 6c 6f 77 | 242. below| 00000540 29 2e 20 54 68 65 20 64 65 66 61 75 6c 74 2c 20 |). The default, | 00000550 73 65 74 20 77 69 74 68 20 2a 46 58 20 38 2c 20 |set with *FX 8, | 00000560 30 20 69 73 20 39 36 30 30 20 62 61 75 64 2e 0d |0 is 9600 baud..| 00000570 0d 20 20 20 46 58 20 31 35 36 20 28 52 65 61 64 |. FX 156 (Read| 00000580 2f 77 72 69 74 65 20 36 38 35 30 20 63 6f 6e 74 |/write 6850 cont| 00000590 72 6f 6c 20 72 65 67 69 73 74 65 72 20 70 6c 75 |rol register plu| 000005a0 73 20 4f 53 20 63 6f 70 79 29 0d 20 20 20 20 20 |s OS copy). | 000005b0 20 54 68 69 73 20 63 61 6c 6c 20 77 72 69 74 65 | This call write| 000005c0 73 20 74 6f 20 74 68 65 20 63 6f 6e 74 72 6f 6c |s to the control| 000005d0 20 72 65 67 69 73 74 65 72 20 6f 66 20 74 68 65 | register of the| 000005e0 20 36 38 35 30 20 63 68 69 70 20 61 6e 64 20 74 | 6850 chip and t| 000005f0 68 65 0d 20 20 20 20 20 20 4f 53 20 63 6f 70 79 |he. OS copy| 00000600 2e 20 42 79 20 63 6f 6e 73 75 6c 74 69 6e 67 20 |. By consulting | 00000610 74 68 65 20 36 38 35 30 20 64 61 74 61 20 73 68 |the 6850 data sh| 00000620 65 65 74 2c 20 69 74 20 69 73 20 70 6f 73 73 69 |eet, it is possi| 00000630 62 6c 65 20 74 6f 20 69 6d 2d 0d 20 20 20 20 20 |ble to im-. | 00000640 20 70 6c 65 6d 65 6e 74 20 73 65 72 69 61 6c 20 | plement serial | 00000650 73 74 61 6e 64 61 72 64 73 20 6f 74 68 65 72 20 |standards other | 00000660 74 68 61 6e 20 74 68 65 20 22 38 4e 31 22 20 64 |than the "8N1" d| 00000670 65 66 61 75 6c 74 2e 0d 20 20 20 20 20 20 20 20 |efault.. | 00000680 20 54 68 65 20 61 63 74 69 6f 6e 20 6f 66 20 74 | The action of t| 00000690 68 69 73 20 4f 53 42 79 74 65 20 69 73 3a 0d 20 |his OSByte is:. | 000006a0 20 20 20 20 20 20 20 20 20 20 20 3c 72 65 67 69 | <regi| 000006b0 73 74 65 72 3e 20 3d 20 28 3c 6f 6c 64 72 65 67 |ster> = (<oldreg| 000006c0 69 73 74 65 72 3e 20 41 4e 44 20 59 29 20 45 4f |ister> AND Y) EO| 000006d0 52 20 58 0d 0d 20 20 20 20 20 20 72 65 74 75 72 |R X.. retur| 000006e0 6e 69 6e 67 20 77 69 74 68 20 58 20 3d 20 3c 6f |ning with X = <o| 000006f0 6c 64 72 65 67 69 73 74 65 72 3e 20 61 6e 64 20 |ldregister> and | 00000700 41 2c 20 59 20 70 72 65 73 65 72 76 65 64 2e 0d |A, Y preserved..| 00000710 0d 20 20 20 46 58 20 31 38 31 20 28 44 65 74 65 |. FX 181 (Dete| 00000720 72 6d 69 6e 65 20 61 63 74 69 6f 6e 20 6f 6e 20 |rmine action on | 00000730 72 65 63 65 69 76 69 6e 67 20 65 73 63 61 70 65 |receiving escape| 00000740 2f 73 6f 66 74 20 6b 65 79 29 0d 20 20 20 20 20 |/soft key). | 00000750 20 55 6e 69 6d 70 6c 65 6d 65 6e 74 65 64 2e 20 | Unimplemented. | 00000760 4e 6f 20 65 78 70 61 6e 73 69 6f 6e 20 6f 66 20 |No expansion of | 00000770 65 73 63 61 70 65 20 6f 72 20 73 6f 66 74 20 6b |escape or soft k| 00000780 65 79 73 20 6f 63 63 75 72 2e 0d 0d 20 20 20 46 |eys occur... F| 00000790 58 20 31 39 31 20 28 52 65 61 64 2f 77 72 69 74 |X 191 (Read/writ| 000007a0 65 20 52 53 34 32 33 20 69 6e 20 75 73 65 20 66 |e RS423 in use f| 000007b0 6c 61 67 29 0d 20 20 20 20 20 20 54 68 69 73 20 |lag). This | 000007c0 63 61 6c 6c 20 74 65 73 74 73 20 77 68 65 74 68 |call tests wheth| 000007d0 65 72 20 74 68 65 20 52 53 34 32 33 20 68 61 72 |er the RS423 har| 000007e0 64 77 61 72 65 20 69 73 20 62 75 73 79 2c 20 72 |dware is busy, r| 000007f0 65 74 75 72 6e 69 6e 67 20 77 69 74 68 0d 20 20 |eturning with. | 00000800 20 20 20 20 62 69 74 20 37 20 73 65 74 20 69 66 | bit 7 set if| 00000810 20 69 74 20 69 73 20 66 72 65 65 2c 20 62 69 74 | it is free, bit| 00000820 73 20 30 20 74 6f 20 36 20 61 72 65 20 75 6e 64 |s 0 to 6 are und| 00000830 65 66 69 6e 65 64 2e 20 56 61 6c 75 65 20 27 62 |efined. Value 'b| 00000840 75 73 79 27 0d 20 20 20 20 20 20 6d 65 61 6e 73 |usy'. means| 00000850 20 74 68 61 74 20 65 69 74 68 65 72 20 74 72 61 | that either tra| 00000860 6e 73 6d 69 74 20 6f 72 20 72 65 63 65 69 76 65 |nsmit or receive| 00000870 20 69 6e 74 65 72 72 75 70 74 73 20 61 72 65 20 | interrupts are | 00000880 65 6e 61 62 6c 65 64 2c 0d 20 20 20 20 20 20 77 |enabled,. w| 00000890 72 69 74 65 73 20 74 6f 20 74 68 69 73 20 6c 6f |rites to this lo| 000008a0 63 61 74 69 6f 6e 20 61 72 65 20 69 67 6e 6f 72 |cation are ignor| 000008b0 65 64 2e 0d 0d 20 20 20 46 58 20 31 39 31 20 28 |ed... FX 191 (| 000008c0 52 65 61 64 2f 77 72 69 74 65 20 36 38 35 30 20 |Read/write 6850 | 000008d0 63 6f 6e 74 72 6f 6c 20 72 65 67 69 73 74 65 72 |control register| 000008e0 20 4f 53 20 63 6f 70 79 20 6f 6e 6c 79 29 0d 20 | OS copy only). | 000008f0 20 20 20 20 20 54 68 69 73 20 63 61 6c 6c 20 72 | This call r| 00000900 65 61 64 73 20 6f 72 20 77 72 69 74 65 73 20 74 |eads or writes t| 00000910 68 65 20 4f 53 20 63 6f 70 79 20 6f 66 20 74 68 |he OS copy of th| 00000920 65 20 63 6f 6e 74 72 6f 6c 20 72 65 67 69 73 74 |e control regist| 00000930 65 72 20 6f 6e 0d 20 20 20 20 20 20 74 68 65 20 |er on. the | 00000940 36 38 35 30 20 63 68 69 70 2e 20 44 6f 20 6e 6f |6850 chip. Do no| 00000950 74 20 77 72 69 74 65 20 74 6f 20 74 68 69 73 20 |t write to this | 00000960 6c 6f 63 61 74 69 6f 6e 20 61 73 20 69 74 20 77 |location as it w| 00000970 6f 75 6c 64 20 6d 61 6b 65 20 74 68 65 0d 20 20 |ould make the. | 00000980 20 20 20 20 63 6f 70 79 20 69 6e 63 6f 6e 73 69 | copy inconsi| 00000990 73 74 65 6e 74 20 77 69 74 68 20 74 68 65 20 76 |stent with the v| 000009a0 61 6c 75 65 20 69 6e 20 74 68 65 20 63 68 69 70 |alue in the chip| 000009b0 2e 0d 0d 20 20 20 46 58 20 32 30 33 20 28 52 65 |... FX 203 (Re| 000009c0 61 64 2f 77 72 69 74 65 20 69 6e 70 75 74 20 62 |ad/write input b| 000009d0 75 66 66 65 72 20 68 61 6e 64 73 68 61 6b 65 20 |uffer handshake | 000009e0 63 65 69 6c 69 6e 67 29 0d 20 20 20 20 20 20 49 |ceiling). I| 000009f0 66 20 74 68 65 20 6e 75 6d 62 65 72 20 6f 66 20 |f the number of | 00000a00 66 72 65 65 20 62 79 74 65 73 20 69 6e 20 74 68 |free bytes in th| 00000a10 65 20 69 6e 70 75 74 20 62 75 66 66 65 72 20 66 |e input buffer f| 00000a20 61 6c 6c 73 20 62 65 6c 6f 77 20 74 68 65 0d 20 |alls below the. | 00000a30 20 20 20 20 20 6e 75 6d 62 65 72 20 68 65 6c 64 | number held| 00000a40 20 69 6e 20 74 68 69 73 20 6c 6f 63 61 74 69 6f | in this locatio| 00000a50 6e 20 74 68 65 20 52 54 53 20 6c 69 6e 65 20 77 |n the RTS line w| 00000a60 69 6c 6c 20 67 6f 20 68 69 67 68 20 74 6f 20 73 |ill go high to s| 00000a70 74 6f 70 20 61 6e 79 0d 20 20 20 20 20 20 66 75 |top any. fu| 00000a80 72 74 68 65 72 20 62 79 74 65 73 20 62 65 69 6e |rther bytes bein| 00000a90 67 20 73 65 6e 74 20 66 72 6f 6d 20 74 68 65 20 |g sent from the | 00000aa0 6f 74 68 65 72 20 63 6f 6d 70 75 74 65 72 2e 0d |other computer..| 00000ab0 20 20 20 20 20 20 20 20 20 49 74 20 63 6f 6e 74 | It cont| 00000ac0 61 69 6e 73 20 39 20 62 79 20 64 65 66 61 75 6c |ains 9 by defaul| 00000ad0 74 20 6f 6e 20 73 6f 66 74 20 61 6e 64 20 68 61 |t on soft and ha| 00000ae0 72 64 20 72 65 73 65 74 73 2e 0d 0d 20 20 20 46 |rd resets... F| 00000af0 58 20 32 30 34 20 28 52 65 61 64 2f 77 72 69 74 |X 204 (Read/writ| 00000b00 65 20 73 65 72 69 61 6c 20 73 75 70 70 72 65 73 |e serial suppres| 00000b10 73 69 6f 6e 20 66 6c 61 67 29 0d 20 20 20 20 20 |sion flag). | 00000b20 20 55 6e 69 6d 70 6c 65 6d 65 6e 74 65 64 2e 20 | Unimplemented. | 00000b30 54 68 65 20 73 65 63 6f 6e 64 20 73 65 72 69 61 |The second seria| 00000b40 6c 20 63 61 72 64 20 52 53 34 32 33 20 69 6e 70 |l card RS423 inp| 00000b50 75 74 20 63 61 6e 6e 6f 74 20 62 65 20 0d 20 20 |ut cannot be . | 00000b60 20 20 20 20 73 75 70 70 72 65 73 73 65 64 2e 0d | suppressed..| 00000b70 0d 20 20 20 46 58 20 32 30 35 20 28 52 65 61 64 |. FX 205 (Read| 00000b80 2f 77 72 69 74 65 20 68 61 72 64 77 61 72 65 20 |/write hardware | 00000b90 75 73 65 20 66 6c 61 67 29 0d 20 20 20 20 20 20 |use flag). | 00000ba0 54 68 69 73 20 6c 6f 63 61 74 69 6f 6e 20 63 6f |This location co| 00000bb0 6e 74 61 69 6e 73 20 26 30 30 20 69 66 20 74 68 |ntains &00 if th| 00000bc0 65 20 68 61 72 64 77 61 72 65 20 69 73 20 75 73 |e hardware is us| 00000bd0 65 64 20 69 6e 20 52 53 34 32 33 20 64 61 74 61 |ed in RS423 data| 00000be0 0d 20 20 20 20 20 20 6d 6f 64 65 20 26 34 30 20 |. mode &40 | 00000bf0 69 66 20 74 68 65 20 68 61 72 64 77 61 72 65 20 |if the hardware | 00000c00 69 73 20 75 73 65 64 20 69 6e 20 63 61 73 73 65 |is used in casse| 00000c10 74 74 65 20 6d 6f 64 65 2e 20 49 74 20 77 69 6c |tte mode. It wil| 00000c20 6c 20 61 6c 77 61 79 73 0d 20 20 20 20 20 20 63 |l always. c| 00000c30 6f 6e 74 61 69 6e 20 30 20 66 6f 72 20 74 68 65 |ontain 0 for the| 00000c40 20 73 65 63 6f 6e 64 20 73 65 72 69 61 6c 20 63 | second serial c| 00000c50 61 72 64 2e 0d 0d 20 20 20 46 58 20 32 33 32 20 |ard... FX 232 | 00000c60 28 52 65 61 64 2f 77 72 69 74 65 20 49 52 51 20 |(Read/write IRQ | 00000c70 6d 61 73 6b 29 0d 20 20 20 20 20 20 55 6e 69 6d |mask). Unim| 00000c80 70 6c 65 6d 65 6e 74 65 64 2e 20 54 68 65 20 49 |plemented. The I| 00000c90 52 51 20 6d 61 73 6b 20 69 73 20 61 6c 77 61 79 |RQ mask is alway| 00000ca0 73 20 32 35 35 2c 20 61 6e 64 20 68 61 6e 64 6c |s 255, and handl| 00000cb0 65 64 20 69 6e 74 65 72 6e 61 6c 6c 79 2e 0d 0d |ed internally...| 00000cc0 20 20 20 46 58 20 32 34 32 20 28 52 65 61 64 2f | FX 242 (Read/| 00000cd0 77 72 69 74 65 20 73 65 72 69 61 6c 20 55 4c 41 |write serial ULA| 00000ce0 20 72 65 67 69 73 74 65 72 20 4f 53 20 63 6f 70 | register OS cop| 00000cf0 79 20 6f 6e 6c 79 29 0d 20 20 20 20 20 20 54 68 |y only). Th| 00000d00 69 73 20 63 61 6c 6c 20 72 65 61 64 73 20 6f 72 |is call reads or| 00000d10 20 77 72 69 74 65 73 20 74 68 65 20 73 65 63 6f | writes the seco| 00000d20 6e 64 20 73 65 72 69 61 6c 20 63 61 72 64 27 73 |nd serial card's| 00000d30 20 73 65 72 69 61 6c 20 55 4c 41 2e 20 54 68 65 | serial ULA. The| 00000d40 0d 20 20 20 20 20 20 62 79 74 65 20 69 73 20 73 |. byte is s| 00000d50 65 74 20 6f 75 74 20 61 73 20 25 6d 73 72 72 72 |et out as %msrrr| 00000d60 74 74 74 6d 20 77 68 65 72 65 3a 0d 20 20 20 20 |tttm where:. | 00000d70 20 20 20 20 20 6d 3d 6d 6f 74 6f 72 20 72 65 6c | m=motor rel| 00000d80 61 79 20 73 74 61 74 65 20 28 61 6c 77 61 79 73 |ay state (always| 00000d90 20 30 2c 20 74 68 65 72 65 20 69 73 20 6e 6f 20 | 0, there is no | 00000da0 72 65 6c 61 79 20 6f 6e 20 74 68 65 20 63 61 72 |relay on the car| 00000db0 64 29 0d 20 20 20 20 20 20 20 20 20 73 3d 73 79 |d). s=sy| 00000dc0 73 74 65 6d 20 73 65 6c 65 63 74 20 28 61 6c 77 |stem select (alw| 00000dd0 61 79 73 20 31 2c 20 74 68 65 20 63 61 72 64 20 |ays 1, the card | 00000de0 69 73 20 61 6c 77 61 79 73 20 69 6e 20 52 53 34 |is always in RS4| 00000df0 32 33 20 6d 6f 64 65 29 0d 20 20 20 20 20 20 20 |23 mode). | 00000e00 20 20 72 72 72 3d 72 65 63 65 69 76 65 20 62 61 | rrr=receive ba| 00000e10 75 64 20 72 61 74 65 20 28 73 65 65 20 74 61 62 |ud rate (see tab| 00000e20 6c 65 29 0d 20 20 20 20 20 20 20 20 20 74 74 74 |le). ttt| 00000e30 3d 74 72 61 6e 73 6d 69 74 20 62 61 75 64 20 72 |=transmit baud r| 00000e40 61 74 65 20 28 73 65 65 20 74 61 62 6c 65 29 0d |ate (see table).| 00000e50 0d 20 20 20 20 20 20 54 68 65 20 62 61 75 64 20 |. The baud | 00000e60 72 61 74 65 73 20 72 65 61 64 20 66 72 6f 6d 20 |rates read from | 00000e70 74 68 65 20 55 4c 41 20 61 72 65 3a 0d 20 20 20 |the ULA are:. | 00000e80 20 20 20 20 20 20 25 30 30 30 20 3d 20 31 39 32 | %000 = 192| 00000e90 30 30 20 20 20 20 20 20 25 30 30 31 20 3d 20 31 |00 %001 = 1| 00000ea0 32 30 30 0d 20 20 20 20 20 20 20 20 20 25 31 30 |200. %10| 00000eb0 30 20 3d 20 20 39 36 30 30 20 20 20 20 20 20 25 |0 = 9600 %| 00000ec0 31 30 31 20 3d 20 20 33 30 30 0d 20 20 20 20 20 |101 = 300. | 00000ed0 20 20 20 20 25 30 31 30 20 3d 20 20 34 38 30 30 | %010 = 4800| 00000ee0 20 20 20 20 20 20 25 30 31 31 20 3d 20 31 35 30 | %011 = 150| 00000ef0 0d 20 20 20 20 20 20 20 20 20 25 31 31 30 20 3d |. %110 =| 00000f00 20 20 32 34 30 30 20 20 20 20 20 20 25 31 31 31 | 2400 %111| 00000f10 20 3d 20 20 37 35 0d 0d 20 20 20 20 20 20 44 6f | = 75.. Do| 00000f20 20 6e 6f 74 20 77 72 69 74 65 20 74 6f 20 74 68 | not write to th| 00000f30 69 73 20 6c 6f 63 61 74 69 6f 6e 20 61 73 20 69 |is location as i| 00000f40 74 20 77 6f 75 6c 64 20 6d 61 6b 65 20 74 68 65 |t would make the| 00000f50 20 63 6f 70 79 20 69 6e 63 6f 6e 73 69 73 2d 0d | copy inconsis-.| 00000f60 20 20 20 20 20 20 74 65 6e 74 20 77 69 74 68 20 | tent with | 00000f70 74 68 65 20 76 61 6c 75 65 20 69 6e 20 74 68 65 |the value in the| 00000f80 20 55 4c 41 2e 0d 20 20 20 20 20 20 20 20 20 20 | ULA.. | 00000f90 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000fb0 20 20 20 20 20 20 52 6f 62 65 72 74 20 53 70 72 | Robert Spr| 00000fc0 6f 77 73 6f 6e 2c 20 45 55 47 20 23 35 36 0d |owson, EUG #56.| 00000fcf
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