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Utils/DUALSC1

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 » telesoftware1.adl
Filename: Utils/DUALSC1
Read OK:
File size: 2418 bytes
Load address: 1900
Exec address: 8023
Duplicates

There is 1 duplicate copy of this file in the archive:

File contents
    1PRINTCHR$12''"This program saves DUALSCN"'"for 'Dual Screen 2' (DUALSC2)"''"Press any key to save code";:Z=GET
   10REM *** DUAL SCREEN ***
   20REM (C) The Micro User
   30REM By Pete Gaunt
   40REM Assemble code to use I/O processor memory for extra screen
   50REM Code must run in the I/O processor
   60REM Modes 4, 5 and 6 only.
   70REM Code saved after assembly as "dualscn"
   80REM Run using Basic 2 or Hi-Basic
   90code=&2C00
  100DIM ass_addr &400
  110REM Code assembles at ass_addr but with origin at "code". Inc store space
  120userv=&200
  130oldv=&230:REM spare vector, may cause trouble if other software uses it.
  140oswrch=&FFEE
  150osword=&FFF1
  160osbyte=&FFF4
  170FOR I%=4 TO 6 STEP 2
  180O%=ass_addr
  190P%=code
  200[OPT I%
  210.change_vectors   \this routine called when code is *RUN
  220LDA#dualscreen MOD &100   \check that code isn't being re-run
  230CMPuserv
  240BNEfirst_run
  250LDA#dualscreen DIV &100
  260CMPuserv+1
  270BNEfirst_run
  280JMPend_init
  290.first_run  \set up vectors if not already set
  300LDAuserv    \store copy of old user vector contents
  310STAoldv
  320LDAuserv+1
  330STAoldv+1
  340LDA#dualscreen MOD &100  \uservec to point to new code
  350STAuserv
  360LDA#dualscreen DIV &100
  370STAuserv+1
  380.end_init
  390RTS
  400.dualscreen
  410CMP#0
  420BEQok \*code enters with A=0, *line with A=1, oswords 224+ with A=224+
  430JMP(oldv)  \if not *code or *fx136 then exit to old routine
  440.ok
  450STAstore_A
  460STXstore_X
  470STYstore_Y
  480CPX#3  \X less than three switches screens
  490BCSnot_screens
  500JSRscreens
  510BCCfine  \returns with C=0 if everything OK
  520JMPbad_command
  530.fine
  540JMPreturn
  550.not_screens
  560CPX#22
  570BNEnot_init  \X=22 means set up for Mode Y
  580JSRinitialise
  590JMPreturn
  600.not_init
  610CPX#26   \X=26 removes text and graphics windows
  620BNEnot_clear_all
  630JSRcheck
  640JSRno_textwind
  650JSRno_graphwind
  660JMPreturn
  670.not_clear_all
  680CPX#24    \X=24 removes graphics window
  690BNEnot_no_graphwind
  700JSRcheck
  710JSRno_graphwind
  720JMPreturn
  730.not_no_graphwind
  740CPX#28    \X=28 removes text window
  750BNEnot_no_textwind
  760JSRcheck
  770JSRno_textwind
  780JMPreturn
  790.not_no_textwind
  800CPX#19  \X=19 or 20 switches palette flag
  810BEQps
  820CPX#20
  830BNEnot_palette_switch
  840.ps
  850JSRcheck
  860JSRpalette_switch
  870JMPreturn
  880.not_palette_switch
  890CPX#3
  900BNEnot_copy
  910JSRcheck
  920JSRcopy_screen
  930JMPreturn
  940.not_copy
  950CPX#4
  960BNEnot_tell_output
  970JSRcheck
  980JSRtell_output
  990JMPreturn
 1000.not_tell_output
 1010CPX#5
 1020BNEbad_command
 1030JSRcheck
 1040JSRtell_display
 1050.return
 1060RTS     \main return point
 1070.bad_command   \any other X value exits to old uservec routine
 1080LDAstore_A
 1090LDXstore_X
 1100LDYstore_Y
 1110JMP(oldv)
 1120.screens
 1130CPX#0
 1140BNEx_ok
 1150SEC
 1160JMPend_screens
 1170.x_ok
 1180JSRcheck
 1190CPY#0  \Y=0 means switch output to screen X
 1200BNEnot_output
 1210JSRoutput_to_screen
 1220CLC
 1230JMPend_screens
 1240.not_output
 1250CPY#1  \Y=1 means reveal screen X
 1260BNEnot_reveal
 1270JSRreveal_screen
 1280CLC
 1290JMPend_screens
 1300.not_reveal
 1310CPY#2  \Y=2 means output to and reveal screen X
 1320BEQnr_ok
 1330SEC
 1340JMPend_screens
 1350.nr_ok
 1360JSRoutput_to_screen
 1370JSRreveal_screen
 1380CLC
 1390.end_screens
 1400RTS
 1410.output_to_screen
 1420JSRcurrent_screen
 1430CPXstore_X
 1440BEQend_ots  \if screen requested is the one already used then do nothing
 1450JSRswap_variables \else swap variables
 1460.end_ots
 1470RTS
 1480.rev_scn BRK \store for current revealed screen start address
 1490.reveal_screen
 1500JSRget_start \get start of screen X in A
 1510STArev_scn
 1520LSR A
 1530LSR A
 1540LSR A  \divide by 8
 1550STArev_codes+17
 1560LDA#rev_codes MOD &100
 1570STAvdu+1
 1580LDA#rev_codes DIV &100
 1590STAvdu+2
 1600LDXrev_codes
 1610JSRvdu    \change 6845 CRTC registers 12 & 13
 1620RTS
 1630.rev_codes
 1640EQUB(20) \20 bytes
 1650EQUD(0)  \equiv to VDU23;12,x;0;0;0;23;13,0;0;0;0;
 1660EQUD(&0D000000)
 1670EQUD(&00001700)
 1680EQUD(0)
 1690EQUD(&17000CFF)  \"FF" set up by reveal routine
 1700.no_textwind  \set text window of current output screen to whole screen
 1710LDA#t_window MOD &100
 1720STAvdu+1
 1730LDA#t_window DIV &100
 1740STAvdu+2
 1750LDXt_window
 1760JSRvdu
 1770RTS
 1780.t_window \store for default text window
 1790EQUB(6) \6 bytes
 1800EQUD(&001E)  \sequence ends in 30 (to simulate VDU26)
 1810EQUW(0) \set by set_up routine to 28,a,b,c,d,30 (in reverse)
 1820.no_graphwind \set graphics window to whole screen
 1830LDA#ngw_codes MOD &100
 1840STAvdu+1
 1850LDA#ngw_codes DIV &100
 1860STAvdu+2
 1870LDXngw_codes
 1880JSRvdu
 1890RTS
 1900.ngw_codes
 1910EQUB(20) \20 bytes
 1920EQUD(0)  \equiv to VDU29,0;0;24,0;0;1279;1023;25,4,0;0;
 1930EQUD(&FF031904)
 1940EQUD(&0000FF04)
 1950EQUD(&00180000)
 1960EQUD(&1D000000)
 1970.copy_screen  \relies on screens starting at page boundary
 1980JSRcurrent_screen   \and lo-byte of length always being zero
 1990CPX#1
 2000BNEtwo_to_one
 2010LDXscreen
 2020LDYscreen+1
 2030JMPmove_mem
 2040.two_to_one
 2050LDXscreen+1
 2060LDYscreen
 2070.move_mem
 2080STXstart1+2
 2090STYstart2+2
 2100LDA#0
 2110STAstart1+1
 2120STAstart2+1
 2130LDY#0
 2140LDXlength
 2150.start1
 2160LDA&FFFF,Y  \dummy operand
 2170.start2
 2180STA&FFFF,Y  \dummy operand
 2190INY
 2200BNEstart1
 2210INCstart1+2
 2220INCstart2+2
 2230DEX
 2240BNEstart1
 2250RTS
 2260.tell_output
 2270JSRflush_keyboard
 2280JSRcurrent_screen
 2290TXA
 2300CLC
 2310ADC#48
 2320TAY
 2330JSRpoke_keyboard
 2340RTS
 2350.tell_display
 2360JSRflush_keyboard
 2370LDY#49
 2380LDArev_scn
 2390CMPscreen
 2400BEQsc1
 2410INY
 2420.sc1
 2430JSRpoke_keyboard
 2440RTS
 2450.flush_keyboard
 2460LDA#21
 2470LDX#0
 2480JSRosbyte
 2490RTS
 2500.poke_keyboard  \put char in Y into keyboard buffer
 2510LDA#138
 2520LDX#0
 2530JSRosbyte
 2540RTS
 2550.get_start  \return hi-byte of screen start in A
 2560LDXstore_X
 2570DEX
 2580LDAscreen,X
 2590RTS
 2600.vdu  \output VDU codes. Number of bytes passed in X
 2610LDA&FFFF,X  \dummy operand
 2620JSRoswrch
 2630DEX   \note list is accessed from end. Set up in reverse.
 2640BNEvdu
 2650RTS
 2660.current_screen  \returns current output screen (1 or 2) in X
 2670LDX#1
 2680LDA&34E
 2690CMPscreen
 2700BEQend_cs
 2710INX
 2720.end_cs
 2730RTS
 2740.palette_switch  \set flag for separate/common palettes
 2750LDA#0
 2760STApalette
 2770CPX#20
 2780BNEnot_off
 2790INCpalette  \palette=1 if X=20 (no separate palettes)
 2800.not_off
 2810RTS
 2820.check  \check if enabled or mode changed
 2830LDAenabled
 2840BNEcheck_mode
 2850BRK    \generate error if not set up (with *CODE22,Y)
 2860EQUB(254)
 2870EQUS("Not set up")
 2880BRK
 2890.check_mode
 2900LDA&355  \&355 contains current mode
 2910CMPmode
 2920BNEmode_changed
 2930RTS
 2940.mode_changed   \generate error if mode has changed since set up
 2950BRK
 2960EQUB(253)
 2970EQUS"Mode changed"
 2980BRK
 2990.enabled
 3000BRK
 3010.swap_variables  \swap current variables with stored variables
 3020LDX#0
 3030.swap_loop
 3040LDA&300,X
 3050PHA
 3060LDAstore,X
 3070STA&300,X
 3080PLA
 3090STAstore,X
 3100INX
 3110CPX#&7F
 3120BNEswap_loop
 3130LDX#0
 3140.swapzp_loop
 3150LDA&D0,X
 3160PHA
 3170LDAzp_store,X
 3180STA&D0,X
 3190PLA
 3200STAzp_store,X
 3210INX
 3220CPX#&A
 3230BNEswapzp_loop
 3240LDApalette
 3250BNEnot_palette \if palette<>0 then ignore palette changes
 3260LDA&360   \&360 contains number of colours in current mode minus one
 3270STAno_colours
 3280INCno_colours
 3290LDX#0
 3300.palette_loop
 3310LDA&36F,X    \&36F - &37E contain current palette
 3320STXosword_block
 3330STAosword_block+1
 3340TXA
 3350PHA
 3360LDA#&C       \use osword &C to program Video ULA with stored palette
 3370LDX#osword_block MOD &100  \faster than VDU19
 3380LDY#osword_block DIV &100
 3390JSRosword
 3400PLA
 3410TAX
 3420INX
 3430CPXno_colours
 3440BCCpalette_loop
 3450.not_palette
 3460RTS
 3470.initialise    \called after *code22,Y
 3480CPY#7
 3490BCSno_way
 3500CPY#4
 3510BCCno_way  \if not Mode 4,5 or 6 then flag error
 3520STYmode
 3530LDA#22
 3540JSRoswrch
 3550TYA
 3560JSRoswrch   \change to Mode Y
 3570LDA&354    \store length of screen memory (hi-byte)
 3580STAlength
 3590LDA&34E
 3600STAscreen  \store bottom of normal screen memory (hi-byte)
 3610SEC
 3620SBClength \subtract length of screen
 3630STAscreen+1  \store start address for extra screen
 3640LDA#28
 3650STAt_window+6
 3660LDX#0
 3670LDY#4
 3680.wloop \store default text window
 3690LDA&308,X
 3700STAt_window+1,Y
 3710INX
 3720DEY
 3730BNEwloop
 3740JSRno_textwind
 3750LDX#0
 3760.su_loop  \store default VDU variables from page 3 in store
 3770LDA&300,X
 3780STAstore,X
 3790INX
 3800CPX#&7F
 3810BNEsu_loop
 3820LDX#0
 3830.su_loop2
 3840LDA&D0,X   \store default vdu variables from zero page in zp_store
 3850STAzp_store,X
 3860INX
 3870CPX#&A
 3880BNEsu_loop2
 3890LDAscreen+1 \alter value of screen start in store to that of new screen
 3900STAstore+&4E
 3910STAstore+&51
 3920LDA#1
 3930STAenabled   \set enabled flag
 3940\clear both screens. OSBYTE 136 is same as *code
 3950LDA#136
 3960LDX#2
 3970LDY#0
 3980JSRosbyte
 3990LDA#12
 4000JSRoswrch
 4010LDA#136
 4020LDX#1
 4030LDY#2
 4040JSRosbyte
 4050LDA#12
 4060JSRoswrch
 4070RTS
 4080.no_way  \generate error if not Mode 4, 5 or 6
 4090LDA#0
 4100STAenabled
 4110BRK
 4120EQUB(252) \error number 252
 4130EQUS("Mode!")
 4140BRK
 4150.palette BRK
 4160.store_A BRK
 4170.store_X BRK
 4180.store_Y BRK
 4190.screen   \store for hi-bytes of start of each screen
 4200BRK
 4210BRK
 4220.length   \store for hi_byte of screen length
 4230BRK
 4240.no_colours   \store for number of colours in current mode
 4250BRK
 4260.mode
 4270EQUB(255)  \store for screen mode when set up (with *code22,Y)
 4280.osword_block
 4290EQUB(0)
 4300EQUD(0)
 4310.store
 4320EQUS(STRING$(&80,CHR$0)) \store for page 3 (first &7F bytes)
 4330.zp_store
 4340EQUS(STRING$(&B,CHR$0))  \store for zero page &D0 to &DA
 4350.end
 4360]
 4370NEXT
 4380S%=code OR &FFFF0000
 4390OSCLI"*save dualscn "+STR$~ass_addr+" "+STR$~O%+" "+STR$~S%+" "+STR$~S%
i�12''"This program saves DUALSCN"'"for 'Dual Screen 2' (DUALSC2)"''"Press any key to save code";:Z=�

� *** DUAL SCREEN ***
� (C) The Micro User
� By Pete Gaunt
(@� Assemble code to use I/O processor memory for extra screen
2(� Code must run in the I/O processor
<� Modes 4, 5 and 6 only.
F,� Code saved after assembly as "dualscn"
P#� Run using Basic 2 or Hi-Basic
Zcode=&2C00
d� ass_addr &400
nK� Code assembles at ass_addr but with origin at "code". Inc store space
xuserv=&200
�Joldv=&230:� spare vector, may cause trouble if other software uses it.
�oswrch=&FFEE
�osword=&FFF1
�osbyte=&FFF4
�� I%=4 � 6 � 2
�O%=ass_addr
�P%=code
�[OPT I%
�:.change_vectors   \this routine called when code is *�
�?LDA#dualscreen � &100   \check that code isn't being re-run
�CMPuserv
�BNEfirst_run
�LDA#dualscreen � &100
CMPuserv+1
BNEfirst_run
JMPend_init
"2.first_run  \set up vectors if not already set
,7LDAuserv    \store copy of old user vector contents
6STAoldv
@LDAuserv+1
J
STAoldv+1
T8LDA#dualscreen � &100  \uservec to point to new code
^STAuserv
hLDA#dualscreen � &100
rSTAuserv+1
|
.end_init
�RTS
�.dualscreen
�	CMP#0
�JBEQok \*code enters with A=0, *line with A=1, oswords 224+ with A=224+
�?JMP(oldv)  \if not *code or *fx136 then exit to old routine
�.ok
�STAstore_A
�STXstore_X
�STYstore_Y
�.CPX#3  \X less than three switches screens
�BCSnot_screens
�JSRscreens
�/BCCfine  \returns with C=0 if everything OK
JMPbad_command
	.fine

JMPreturn
&.not_screens
0
CPX#22
:.BNEnot_init  \X=22 means set up for Mode Y
DJSRinitialise
N
JMPreturn
X
.not_init
b4CPX#26   \X=26 removes text and graphics windows
lBNEnot_clear_all
vJSRcheck
�JSRno_textwind
�JSRno_graphwind
�
JMPreturn
�.not_clear_all
�+CPX#24    \X=24 removes graphics window
�BNEnot_no_graphwind
�JSRcheck
�JSRno_graphwind
�
JMPreturn
�.not_no_graphwind
�'CPX#28    \X=28 removes text window
�BNEnot_no_textwind
�JSRcheck
JSRno_textwind

JMPreturn
.not_no_textwind
 -CPX#19  \X=19 or 20 switches palette flag
*	BEQps
4
CPX#20
>BNEnot_palette_switch
H.ps
RJSRcheck
\JSRpalette_switch
f
JMPreturn
p.not_palette_switch
z	CPX#3
�BNEnot_copy
�JSRcheck
�JSRcopy_screen
�
JMPreturn
�
.not_copy
�	CPX#4
�BNEnot_tell_output
�JSRcheck
�JSRtell_output
�
JMPreturn
�.not_tell_output
�	CPX#5
�BNEbad_command
JSRcheck
JSRtell_display
.return
$RTS     \main return point
.B.bad_command   \any other X value exits to old uservec routine
8LDAstore_A
BLDXstore_X
LLDYstore_Y
V
JMP(oldv)
`.screens
j	CPX#0
tBNEx_ok
~SEC
�JMPend_screens
�	.x_ok
�JSRcheck
�/CPY#0  \Y=0 means switch output to screen X
�BNEnot_output
�JSRoutput_to_screen
�CLC
�JMPend_screens
�.not_output
�%CPY#1  \Y=1 means reveal screen X
�BNEnot_reveal
�JSRreveal_screen
CLC

JMPend_screens
.not_reveal
3CPY#2  \Y=2 means output to and reveal screen X
(BEQnr_ok
2SEC
<JMPend_screens
F
.nr_ok
PJSRoutput_to_screen
ZJSRreveal_screen
dCLC
n.end_screens
xRTS
�.output_to_screen
�JSRcurrent_screen
�CPXstore_X
�LBEQend_ots  \if screen requested is the one already used then do nothing
�*JSRswap_variables \else swap variables
�.end_ots
�RTS
�A.rev_scn BRK \store for current revealed screen start address
�.reveal_screen
�,JSRget_start \get start of screen X in A
�STArev_scn
�	LSR A
�	LSR A
LSR A  \divide by 8
STArev_codes+17
LDA#rev_codes � &100
"STAvdu+1
,LDA#rev_codes � &100
6STAvdu+2
@LDXrev_codes
J1JSRvdu    \change 6845 CRTC registers 12 & 13
TRTS
^.rev_codes
hEQUB(20) \20 bytes
r4EQUD(0)  \equiv to �23;12,x;0;0;0;23;13,0;0;0;0;
|EQUD(&0D000000)
�EQUD(&00001700)
�EQUD(0)
�3EQUD(&17000CFF)  \"FF" set up by reveal routine
�K.no_textwind  \set text window of current output screen to whole screen
�LDA#t_window � &100
�STAvdu+1
�LDA#t_window � &100
�STAvdu+2
�LDXt_window
�
JSRvdu
�RTS
�,.t_window \store for default text window
�EQUB(6) \6 bytes
7EQUD(&001E)  \sequence ends in 30 (to simulate �26)
@EQUW(0) \set by set_up routine to 28,a,b,c,d,30 (in reverse)
6.no_graphwind \set graphics window to whole screen
&LDA#ngw_codes � &100
0STAvdu+1
:LDA#ngw_codes � &100
DSTAvdu+2
NLDXngw_codes
X
JSRvdu
bRTS
l.ngw_codes
vEQUB(20) \20 bytes
�9EQUD(0)  \equiv to �29,0;0;24,0;0;1279;1023;25,4,0;0;
�EQUD(&FF031904)
�EQUD(&0000FF04)
�EQUD(&00180000)
�EQUD(&1D000000)
�>.copy_screen  \relies on screens starting at page boundary
�@JSRcurrent_screen   \and lo-byte of length always being zero
�	CPX#1
�BNEtwo_to_one
�
LDXscreen
�LDYscreen+1
�JMPmove_mem
�.two_to_one
LDXscreen+1

LDYscreen

.move_mem
 STXstart1+2
*STYstart2+2
4	LDA#0
>STAstart1+1
HSTAstart2+1
R	LDY#0
\
LDXlength
f.start1
pLDA&FFFF,Y  \dummy operand
z.start2
�STA&FFFF,Y  \dummy operand
�INY
�
BNEstart1
�INCstart1+2
�INCstart2+2
�DEX
�
BNEstart1
�RTS
�.tell_output
�JSRflush_keyboard
�JSRcurrent_screen
�TXA
�CLC
	
ADC#48
	TAY
	JSRpoke_keyboard
	$RTS
	..tell_display
	8JSRflush_keyboard
	B
LDY#49
	LLDArev_scn
	V
CMPscreen
	`
BEQsc1
	jINY
	t.sc1
	~JSRpoke_keyboard
	�RTS
	�.flush_keyboard
	�
LDA#21
	�	LDX#0
	�
JSRosbyte
	�RTS
	�7.poke_keyboard  \put char in Y into keyboard buffer
	�LDA#138
	�	LDX#0
	�
JSRosbyte
	�RTS
	�4.get_start  \return hi-byte of screen start in A
LDXstore_X

DEX
LDAscreen,X
RTS
(6.vdu  \output � codes. Number of bytes passed in X
2LDA&FFFF,X  \dummy operand
<
JSRoswrch
F=DEX   \note list is accessed from end. Set up in reverse.
P
BNEvdu
ZRTS
dA.current_screen  \returns current output screen (1 or 2) in X
n	LDX#1
xLDA&34E
�
CMPscreen
�
BEQend_cs
�INX
�.end_cs
�RTS
�;.palette_switch  \set flag for separate/common palettes
�	LDA#0
�STApalette
�
CPX#20
�BNEnot_off
�9INCpalette  \palette=1 if X=20 (no separate palettes)
�.not_off
�RTS
-.check  \check if enabled or mode changed
LDAenabled
BNEcheck_mode
"9BRK    \generate error if not set up (with *CODE22,Y)
,
EQUB(254)
6EQUS("Not set up")
@BRK
J.check_mode
T(LDA&355  \&355 contains current mode
^CMPmode
hBNEmode_changed
rRTS
|D.mode_changed   \generate error if mode has changed since set up
�BRK
�
EQUB(253)
�EQUS"Mode changed"
�BRK
�.enabled
�BRK
�B.swap_variables  \swap current variables with stored variables
�	LDX#0
�.swap_loop
�
LDA&300,X
�PHA
�LDAstore,X
�
STA&300,X
PLA
STAstore,X
INX
&CPX#&7F
0BNEswap_loop
:	LDX#0
D.swapzp_loop
NLDA&D0,X
XPHA
bLDAzp_store,X
lSTA&D0,X
vPLA
�STAzp_store,X
�INX
�
CPX#&A
�BNEswapzp_loop
�LDApalette
�=BNEnot_palette \if palette<>0 then ignore palette changes
�HLDA&360   \&360 contains number of colours in current mode minus one
�STAno_colours
�INCno_colours
�	LDX#0
�.palette_loop
�5LDA&36F,X    \&36F - &37E contain current palette
�STXosword_block

STAosword_block+1

TXA

PHA

 HLDA#&C       \use osword &C to program Video ULA with stored palette

*-LDX#osword_block � &100  \faster than �19

4LDY#osword_block � &100

>
JSRosword

HPLA

RTAX

\INX

fCPXno_colours

pBCCpalette_loop

z.not_palette

�RTS

�*.initialise    \called after *code22,Y

�	CPY#7

�
BCSno_way

�	CPY#4

�4BCCno_way  \if not Mode 4,5 or 6 then flag error

�STYmode

�
LDA#22

�
JSRoswrch

�TYA

�!JSRoswrch   \change to Mode Y

�7LDA&354    \store length of screen memory (hi-byte)

�
STAlength
LDA&34E
>STAscreen  \store bottom of normal screen memory (hi-byte)
SEC
$(SBClength \subtract length of screen
.6STAscreen+1  \store start address for extra screen
8
LDA#28
BSTAt_window+6
L	LDX#0
V	LDY#4
`%.wloop \store default text window
j
LDA&308,X
tSTAt_window+1,Y
~INX
�DEY
�BNEwloop
�JSRno_textwind
�	LDX#0
�=.su_loop  \store default � variables from page 3 in store
�
LDA&300,X
�STAstore,X
�INX
�CPX#&7F
�BNEsu_loop
�	LDX#0
�
.su_loop2
FLDA&D0,X   \store default vdu variables from zero page in zp_store

STAzp_store,X
INX

CPX#&A
(BNEsu_loop2
2KLDAscreen+1 \alter value of screen start in store to that of new screen
<STAstore+&4E
FSTAstore+&51
P	LDA#1
Z"STAenabled   \set enabled flag
d4\clear both screens. OSBYTE 136 is same as *code
nLDA#136
x	LDX#2
�	LDY#0
�
JSRosbyte
�
LDA#12
�
JSRoswrch
�LDA#136
�	LDX#1
�	LDY#2
�
JSRosbyte
�
LDA#12
�
JSRoswrch
�RTS
�2.no_way  \generate error if not Mode 4, 5 or 6
�	LDA#0
STAenabled
BRK
EQUB(252) \error number 252
"EQUS("Mode!")
,BRK
6.palette BRK
@.store_A BRK
J.store_X BRK
T.store_Y BRK
^9.screen   \store for hi-bytes of start of each screen
hBRK
rBRK
|1.length   \store for hi_byte of screen length
�BRK
�>.no_colours   \store for number of colours in current mode
�BRK
�	.mode
�BEQUB(255)  \store for screen mode when set up (with *code22,Y)
�.osword_block
�EQUB(0)
�EQUD(0)
�
.store
�6EQUS(�&80,�0)) \store for page 3 (first &7F bytes)
�
.zp_store
�2EQUS(�&B,�0))  \store for zero page &D0 to &DA
�.end
]
�
S%=code � &FFFF0000
&;�"*save dualscn "+�~ass_addr+" "+�~O%+" "+�~S%+" "+�~S%
�
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000000b0  40 f4 20 41 73 73 65 6d  62 6c 65 20 63 6f 64 65  |@. Assemble code|
000000c0  20 74 6f 20 75 73 65 20  49 2f 4f 20 70 72 6f 63  | to use I/O proc|
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00002410  22 2b c3 7e 53 25 0d ff                           |"+.~S%..|
00002418
Utils/DUALSC1.m0
Utils/DUALSC1.m1
Utils/DUALSC1.m2
Utils/DUALSC1.m4
Utils/DUALSC1.m5