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Fixed logic flaw

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This commit is contained in:
Karri Kaksonen 2022-03-31 08:05:41 +03:00
parent 2c00f1e898
commit 67def0ca0d
1 changed files with 6 additions and 9 deletions
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15
libsrc/atari7800/joy/atari7800-stdjoy.s
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@ -91,9 +91,9 @@ readbuttons:
; Y has joystick of interest 0/1
; return value:
; $00: no button,
; $80: left/B button,
; $40: right/A button,
; $c0: both buttons
; $01: left/B button,
; $02: right/A button,
; $03: both buttons
; preserves X
tya
beq L5
@ -114,10 +114,7 @@ L2: tya
L3: iny ; .......1
lda #0 ; Fallback to 2600 joystick mode
sta CTLSWB
L4: tya
ror ; .......2 1
ror ; 1....... 2
ror ; 21......
L4: tya ; ......21
rts
L5: ; Joystick 0 processing
@ -147,8 +144,8 @@ READ:
L8: lda SWCHA ; Read joystick
ror ; .RLDU... - joystick 0
L9: tax
jsr readbuttons ; A = 21......, X = .RLDU...
rol ; A = 1 .......2
jsr readbuttons ; A = ......21, X = .RLDU...
ror ; A = .......2 1
tay ; Y = .......2
txa ; A = .RLDU...
ror ; A = 1.RLDU..