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dos33fsprogs
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lemm: switch to other iic vblank method

This commit is contained in:
Vince Weaver 2022-04-15 08:18:47 -04:00
parent b6fcd7efa8
commit f782b5d41c
1 changed files with 4 additions and 3 deletions
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7
games/lemm/intro_level.s
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@ -364,7 +364,7 @@ level_end_messages_h:
.align $100
.if 1
.if 0
;==============
; this code from https://comp.sys.apple2.narkive.com/dHkvl39d/vblank-apple-iic
; as well as IIc technote #9
@ -389,7 +389,7 @@ rdvbl2:
; alternate implementation by Oliver Schmidt
; from https://github.com/cc65/cc65/blob/master/libsrc/apple2/waitvsync.s
split_screen_iic:
sei ; disables interrupts
; sei ; disables interrupts
sta IOUDISOFF
lda RDVBLMSK
bit ENVBL
@ -400,9 +400,10 @@ split_screen_iic:
bcs :+ ; VBL interrupts were already enabled
bit DISVBL
: sta IOUDISON ; IIc Tech Ref Man: The firmware normally leaves IOUDIS on.
cli ; re-enable interrupts
; cli ; re-enable interrupts
jmp start_vblank
.endif