Apple-2gs-SW
/
iigs-game-engine
mirror of https://github.com/lscharen/iigs-game-engine.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Restore shadow reg instead of overwriting

This commit is contained in:
Lucas Scharenbroich 2023-04-27 23:38:26 -05:00
parent df32442fff
commit 57f57ce533
1 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/blitter/Template.s
View File

@ -150,17 +150,17 @@ jmp_rtn_1 jmp l_jmp_rtn-base ; Could inline the code and
; 8 or 16 lines in order to give the system time to handle interrupts.
enable_int ldal stk_save+1 ; restore the stack
tcs
sep #$20 ; 8-bit mode
ldal STATE_REG ; Read Bank 0 / Write Bank 0
and #$CF
sep #$30 ; 8-bit mode
ldal STATE_REG
tax ; Save the value
and #$CF ; Read Bank 0 / Write Bank 0
stal STATE_REG
cli
nop ; Give a couple of cycles
sei
ldal STATE_REG
ora #$10 ; Read Bank 0 / Write Bank 1
txa ; Restore the state
stal STATE_REG
rep #$20
rep #$30
bra entry_1
; This is the spot that needs to be page-aligned. In addition to simplifying the entry address