Apple-2-Tools/4cade
1
0
Fork 0
mirror of https://github.com/a2-4am/4cade.git synced 2024-06-01 23:41:39 +00:00
Code Issues Projects Releases Wiki Activity

documentation

Browse Source
This commit is contained in:
Peter Ferrie 2019-12-21 16:28:59 -08:00
parent 80365fa68e
commit 8e223c8264
1 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/ui.common.a
View File

@ -68,6 +68,7 @@ Home
+READ_ROM_NO_WRITE
sta DHIRESOFF ; get out of DHGR mode
sta CLR80VID ; get out of DHGR mode
; write-order matters for RGB-card
jsr $FB3C ;ROM_TEXTish ; clear screen but don't show it
jsr ROM_HOME ; HOME
lda PAGE1
@ -91,12 +92,20 @@ BlankDHGR
sta WRITEAUXMEM
jsr ClearHGR1 ; clear hi-res screen 1 in auxmem
sta WRITEMAINMEM
; magic sequence to set colour mode on an RGB card
; SET80VID clears the RGB-card shift-register
; DHIRESON/OFF shifts that bit into the mode register
; we do that twice because the mode register is two bits wide
; we need mode 00 for colour
sta SET80VID
sta DHIRESON
sta DHIRESOFF
sta DHIRESON
sta DHIRESOFF
sta DHIRESON
sta DHIRESON ; then turn DHGR on
bit PAGE1
jmp HGRMode