Apple-2-SW/dos33fsprogs
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double: more vblank

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This commit is contained in:
Vince Weaver 2023-05-10 00:49:47 -04:00
parent bf32f928f9
commit 81c2b777ee
2 changed files with 63 additions and 12 deletions
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32
vaporlock/doubledouble/hardware.inc
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@ -1,16 +1,20 @@
; soft-switches
; yes, I know these aren't necessary the "official" names
KEYBOARD = $C000 ; Read
EIGHTYSTOREOFF = $C000 ; Write (turns off 80store)
EIGHTYSTOREON = $C001 ; Write (page2 writes to AUX memory)
CLR80COL = $C00C
SET80COL = $C00D
SETMOUSETEXT = $C00F ; (write) enable mouse text
KEYBOARD = $C000 ; Read keypress+128
EIGHTYSTOREOFF = $C000 ; (write) turns off 80store
EIGHTYSTOREON = $C001 ; (write) page2 writes to AUX memory
CLR80COL = $C00C
SET80COL = $C00D
SETMOUSETEXT = $C00F ; (write) enable mouse text
TBCOLOR = $C022 ; IIgs text foreground / background colors
CLOCKCTL = $C034 ; bits 0-3 are IIgs border color
NEWVIDEO = $C029 ; IIgs graphics modes
VBLANK = $C019 ; *not* RDVBL (VBL signal low) (iie, opposite iigs)
RDVBLBAR = $C019 ; iic
TBCOLOR = $C022 ; IIgs text foreground / background colors
CLOCKCTL = $C034 ; bits 0-3 are IIgs border color
NEWVIDEO = $C029 ; IIgs graphics modes
RDVBLMSK = $C041 ; iic read vbl interrupt
SET_GR = $C050
SET_TEXT= $C051
@ -20,9 +24,13 @@ PAGE1 = $C054
PAGE2 = $C055
LORES = $C056
HIRES = $C057
CLRAN3 = $C05E ; in 80-col mode, enable double graphics
SETAN3 = $C05F ; in 80-col mode, disable double graphics
VBLANK = $C019 ; *not* RDVBL (VBL signal low)
DISVBL = $C05B ; (write) (iic) (ioudison) disable VBL interrupt
ENVBL = $C05B ; (write) (iic) (ioudison) enable VBL interrupt
CLRAN3 = $C05E ; (write) in 80-col mode, enable double graphics
SETAN3 = $C05F ; (write) in 80-col mode, disable double graphics
PTRIG = $C070 ; analog input reset / reset VBL interrupt (iic)
IOUDISON = $C07E ; (write) disable IOU
IOUDISOFF = $C07F ; (write) enable IOU
; ROM routines
SETCOL = $F864 ; COLOR=A*17

43
vaporlock/doubledouble/vblank.s Normal file
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@ -0,0 +1,43 @@
; alternate implementation by Oliver Schmidt
; from https://github.com/cc65/cc65/blob/master/libsrc/apple2/waitvsync.s
wait_vblank_iic:
; sei ; disables interrupts
sta IOUDISOFF
lda RDVBLMSK
bit ENVBL
bit PTRIG ; Reset VBL interrupt flag
: bit RDVBLBAR
bpl :-
asl
bcs :+ ; VBL interrupts were already enabled
bit DISVBL
: sta IOUDISON ; IIc Tech Ref Man: The firmware normally leaves IOUDIS on.
; cli ; re-enable interrupts
rts
;===========================
; wait for vblank on IIgs
; opposte of IIe?
wait_vblank_iigs:
lda VBLANK
bpl wait_vblank_iigs ; wait for negative (in vblank)
wait_vblank_done_iigs:
lda VBLANK ; wait for positive (vlank done)
bmi wait_vblank_done_iigs
rts
;===========================
; wait for vblank on IIe
wait_vblank_iie:
lda VBLANK
bmi wait_vblank_iie ; wait for positive (in vblank)
wait_vblank_done_iie:
lda VBLANK ; wait for negative (vlank done)
bpl wait_vblank_done_iie
rts