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Streamlined machine detection.

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This commit is contained in:
Oliver Schmidt 2020-06-15 19:07:59 +02:00
parent 6adf175691
commit e0a0b2dc25
1 changed files with 16 additions and 24 deletions
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40
libsrc/apple2/joy/a2.stdjoy.s
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@ -52,8 +52,7 @@ libref: .addr $0000
.bss
maxnum: .res 1 ; Maximum joystick number (0 or 1)
iigs: .res 1
ostype: .res 1
value0: .res 1
value1: .res 1
@ -68,20 +67,10 @@ value1: .res 1
INSTALL:
lda libref
ldx libref+1
sta ostype+1
stx ostype+2
ostype: jsr $0000 ; X = 0
and #$F0 ; Mask variants
cmp #$50 ; Any Apple //c
beq :+ ; Only one joystick
inx
: stx maxnum
ldx #$00
cmp #$80 ; Any Apple IIgs
bne :+
inx
: stx iigs
sta gettype+1
stx gettype+2
gettype:jsr $0000
sta ostype
lda #<JOY_ERR_OK
ldx #>JOY_ERR_OK
; Fall through
@ -97,9 +86,11 @@ UNINSTALL:
; COUNT routine. Return the total number of available joysticks in a/x.
COUNT:
ldx maxnum
inx
txa ; Number of joysticks we support
ldx #$02
bit ostype
bvc noiic ; Not $4x
dex ; Only one joystick for the //c
noiic: txa ; Number of joysticks we support
ldx #$00
rts
@ -112,14 +103,15 @@ READ:
sty value1
; If IIgs -> set speed to normal
lda iigs
beq nogs1
bit ostype
bpl nogs1 ; Not $8x
lda CYAREG
pha
and #%01111111
sta CYAREG
; Read both paddles simultaneously
; Read both paddles simultaneously according to:
; Apple IIe Technote #6, The Apple II Paddle Circuits
nogs1: lda PTRIG ; Trigger paddles
loop: lda PADDL0,x ; Read paddle (0 or 2)
bmi set0 ; Cycles: 2 3
@ -140,8 +132,8 @@ nop1: ; - -
bne loop
; If IIgs -> restore speed
lda iigs
beq nogs2
bit ostype
bpl nogs2 ; Not $8x
pla
sta CYAREG