izaya/collapseos
1
0
Fork 0
mirror of https://github.com/hsoft/collapseos.git synced 2024-11-24 00:28:05 +11:00
Code Issues Releases Wiki Activity

sms/vdp: properly protect AF on PutC

Browse Source
This commit is contained in:
Virgil Dupras 2019-07-02 15:54:07 -04:00
parent f41508725d
commit 162e503291
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
kernel/sms/vdp.asm
View File

@ -133,6 +133,8 @@ vdpPutC:
cp ASCII_BS
jr z, vdpBS
push af
; ... but first, let's convert it.
call vdpConv
@ -140,20 +142,21 @@ vdpPutC:
call vdpSpitC
; Move cursor. The screen is 32x24
ex af, af'
ld a, (VDP_ROW)
cp 31
jr z, .incline
; We just need to increase row
inc a
ld (VDP_ROW), a
ex af, af' ; bring back orig A
pop af
ret
.incline:
; increase line and start anew
ex af, af' ; bring back orig A
call vdpCR
jr vdpLF
call vdpLF
pop af
ret
vdpCR:
call vdpClrPos