Apple-2-SW
/
Applecorn
mirror of https://github.com/bobbimanners/Applecorn.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Set text mode 40/80 properly in SHR modes (for COPY)

This commit is contained in:
Bobbi Webber-Manners 2022-12-25 14:40:50 -05:00
parent b4f7615929
commit 32b129c859
2 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

BIN
applecorn.po
View File

Binary file not shown.

7
auxmem.shr.s
View File

@ -85,7 +85,6 @@ SHRTAB DB $20 ; Text row 0
SHRVDU22
LDA #$18 ; Inhibit SHR & aux HGR shadowing
TSB SHADOW
JSR VDU12 ; Clear text and SHR screen
LDA #$80 ; Most significant bit
TSB NEWVIDEO ; Enable SHR mode
LDA VDUPIXELS ; Pixels per byte
@ -93,9 +92,11 @@ SHRVDU22
BNE :MODE0
LDA #SCB320 ; SCB for 320-mode
LDY #00 ; Palette offset
STZ CLR80VID ; 40 column text mode
BRA :S1
:MODE0 LDA #SCB640 ; SCB for 640-mode
LDY #32 ; Palette offset
STZ SET80VID ; 80 column text mode
:S1 LDX #$00
:L1 STAL $E19D00,X ; SCBs begin at $9D00 in $E1
INX
@ -108,6 +109,7 @@ SHRVDU22
INY
CPX #32 ; 32 bytes in palette
BNE :L2
JSR VDU12 ; Clear text and SHR screen
RTS
@ -336,7 +338,8 @@ SHRCLEAR PHP ; Disable interrupts
* Set text colour
* A=txt colour
* TODO: Need to add support for 320 mode also
SHRSETTCOL TAX
SHRSETTCOL AND #$03
TAX
LDA :MASKS640,X ; Lookup mask in table
STA SHRCOLMASK ; Set colour mask
RTS