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Implemented reverse scrolling for VDU11.

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Bobbi Webber-Manners 2022-09-18 19:40:31 -04:00
parent b08a49d5c6
commit 26501923c8
3 changed files with 48 additions and 7 deletions
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BIN
applecorn.po
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2
auxmem.init.s
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@ -204,7 +204,7 @@ BYTE00 BEQ BYTE00A ; OSBYTE 0,0 - generate error
RTS ; %000x1xxx host type, 'A'pple
BYTE00A BRK
DB $F7
HELLO ASC 'Applecorn MOS 2022-09-17'
HELLO ASC 'Applecorn MOS 2022-09-18'
DB $00 ; Unify MOS messages

53
auxmem.vdu.s
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@ -518,8 +518,16 @@ VDU10 LDA VDUTEXTY ; ROW
* Move cursor up
VDU11 LDA VDUTEXTY ; ROW
CMP TXTWINTOP
BEQ :DONE
DEC VDUTEXTY ; ROW
BNE :S1
LDA VDUTEXTX ; COL
CMP TXTWINLFT
BNE :DONE
JSR RSCROLLER
LDA TXTWINLFT
STA VDUTEXTX
JSR CLREOL
RTS
:S1 DEC VDUTEXTY ; ROW
:DONE RTS
* Move to start of line
@ -715,7 +723,7 @@ CLREOLGS BIT $C01F
* Scroll areas of the screen
****************************
* Scroll text window one line
* Scroll text window up one line
SCROLLER LDA TXTWINTOP
:L1 PHA
JSR SCR1LINE
@ -724,12 +732,45 @@ SCROLLER LDA TXTWINTOP
CMP TXTWINBOT
BNE :L1
BIT VDUSTATUS
BVC :L2 ; Copy cursor not active
BVC :S1 ; Copy cursor not active
JSR COPYSWAP1
LDA #11
JSR OUTCHARGO
JSR COPYSWAP1
:L2 RTS
:S1 RTS
* Scroll text window down one line
RSCROLLER DEC TXTWINTOP
LDA TXTWINBOT
DEC A
:L1 PHA
JSR RSCR1LINE
PLA
DEC A
CMP TXTWINTOP
BNE :L1
BIT VDUSTATUS
BVC :S1 ; Copy cursor not active
JSR COPYSWAP1
LDA #11
JSR OUTCHARGO
JSR COPYSWAP1
:S1 INC TXTWINTOP
RTS
* Copy line A to line A+1, respecting text window boundaries
RSCR1LINE PHA
INC A
JSR CHARADDRY ; VDUADDR=>line A+1
LDX #2
:L0 LDA VDUADDR,X ; Copy VDUADDR->VDUADDR2
STA VDUADDR2,X
DEX
BPL :L0
PLA
PHA
JSR CHARADDRY ; VDUADDR=>line A+1
BRA DOSCR1LINE
* Copy line A+1 to line A, respecting text window boundaries
SCR1LINE PHA
@ -743,7 +784,7 @@ SCR1LINE PHA
PHA
INC A
JSR CHARADDRY ; VDUADDR=>line A+1
INC TXTWINRGT
DOSCR1LINE INC TXTWINRGT
BIT VDUBANK
BMI SCR1LINEGS ; AppleGS
LDX TXTWINLFT ; Addr offset for column