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MODE 1 fixes - SHRSCR1LINE and SHRCLREOL

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Bobbi Webber-Manners 2022-12-27 18:25:36 -05:00
parent 9f509e1a9b
commit 31768fefd6
3 changed files with 33 additions and 27 deletions
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BIN
applecorn.po
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2
auxmem.init.s
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@ -218,6 +218,6 @@ BYTE00 BEQ BYTE00A ; OSBYTE 0,0 - generate error
RTS ; %000x1xxx host type, 'A'pple
BYTE00A BRK
DB $F7
HELLO ASC 'Applecorn MOS 2022-12-26'
HELLO ASC 'Applecorn MOS 2022-12-27'
DB $00 ; Unify MOS messages

58
auxmem.shr.s
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@ -482,6 +482,7 @@ SHRNEXTROW LDA VDUADDR+0 ; Add 160 to VDUADDR
* Forwards scroll one line
* Copy text line A+1 to line A
* Note: Code for this courtesy Kent Dickey
* TODO: Not quite right in 320 mode
SHRSCR1LINE PHY
PHX
STA VDUADDR+1 ; Screen line -> MSB
@ -499,47 +500,48 @@ SHRSCR1LINE PHY
ADC VDUADDR ; Mult 5
STA VDUADDR ; VDUADDR = line * $500
LDA TXTWINLFT ; Left margin
ASL ; 2 bytes / char
LDY VDUPIXELS ; Pixels per byte
CPY #$02 ; 2 pixels per byte in 320 mode
BNE :S1
ASL ; 4 bytes / char
:S1 AND #$00ff ; Mask to get 8 bit result
ASL ; Double TXTWINLFT
:S1 ASL ; 2 bytes / char
AND #$00ff ; Mask to get 8 bit result
ADC VDUADDR ; Add to beginning of line addr
STA VDUADDR ; VDUADDR = start position
SEP #$21 ; M 8 bit, X 16 bit, carry set
MX %10 ; Tell Merlin
LDA TXTWINRGT ; Compute width ..
SBC TXTWINLFT ; .. right minus left
REP #$31 ; M,X 16 bit, carry clear
MX %00 ; Tell Merlin
ASL ; 2 bytes / char
LDY VDUPIXELS ; Pixels per byte
CPY #$02 ; 2 pixels per byte in 320 mode
BNE :S2
ASL ; 4 bytes / char
:S2 AND #$00ff ; Mask to get 8 bit result
ASL ; Double the width for 320
INC A ; Plus one
:S2 REP #$31 ; M,X 16 bit, carry clear
MX %00 ; Tell Merlin
ASL ; 2 bytes / char
AND #$00ff ; Mask to get 8 bit result
ADC VDUADDR ; Add to start position
TAX ; Will use as index
PEA #$e1e1 ; Set databank to $E1
PEA #$E1E1 ; Set databank to $E1
PLB
PLB
:LOOP1 LDA $2500,x ; 2 bytes, row 0
STA $2000,x
LDA $25a0,x ; row 1
STA $20a0,x
LDA $2640,x ; row 2
STA $2140,x
LDA $26e0,x ; row 3
STA $21e0,x
LDA $2780,x ; row 4
STA $2280,x
LDA $2820,x ; row 5
STA $2320,x
LDA $28c0,x ; row 6
STA $23c0,x
LDA $2960,x ; row 7
STA $2460,x
:LOOP1 LDA $2500,X ; 2 bytes, row 0
STA $2000,X
LDA $25A0,X ; row 1
STA $20A0,X
LDA $2640,X ; row 2
STA $2140,X
LDA $26E0,X ; row 3
STA $21E0,X
LDA $2780,X ; row 4
STA $2280,X
LDA $2820,X ; row 5
STA $2320,X
LDA $28C0,X ; row 6
STA $23C0,X
LDA $2960,X ; row 7
STA $2460,X
DEX ; Update index
DEX
BMI :DONE ; Jump out if odd->-ve
@ -570,7 +572,11 @@ SHRCLREOL JSR SHRCHARADDR
:L0 LDA VDUTEXTX
TAX
ASL ; 2 bytes / char
TAY
LDY VDUPIXELS ; Pixels per byte
CPY #$02 ; 2 is 320-mode (MODE 1)
BNE :S0
ASL ; 4 bytes / char
:S0 TAY
:L1 CPX TXTWINRGT
BCS :S1
LDA SHRBGMASKA