mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-24 15:31:17 +00:00
32 lines
985 B
Plaintext
32 lines
985 B
Plaintext
;Joystick Assembly Language Library for Oric-1
|
|
;Untested
|
|
|
|
JYSTKS EQU $02 ;Number of Joysticks
|
|
|
|
;Joystick Bit Masks
|
|
JOYUP EQU $10 ;Bit 4 - Up
|
|
JOYDN EQU $08 ;Bit 3 - Down
|
|
JOYLF EQU $01 ;Bit 0 - Left
|
|
JOYRT EQU $02 ;Bit 1 - Right
|
|
JOYB0 EQU $20 ;Bit 5 - Button
|
|
|
|
;Read Joystick (ALTAI)
|
|
;http://wiki.defence-force.org/doku.php?id=oric:hardware:altai_drivers
|
|
JOYSTK: CMP #JYSTKS ;If Joystick# >= Maximum
|
|
BCS JOYSTZ ; Return Error
|
|
TAX ;Copy Joystick# to X
|
|
LDY JOYSTT,X ;Load Y from Table
|
|
LDA #%11000000
|
|
STA $0303 ;Set Data Direction Register A
|
|
STY $0301 ;Select Joystick
|
|
LDA $0301 ;Read Joystick
|
|
LDY #%11111111
|
|
STY $0303 ;Restore Data Direction Register A
|
|
AND #%00111111 ;Mask Bits
|
|
EOR #%00111111 ;and Invert Them
|
|
RTS
|
|
JOYSTZ: LDA #$FF ;Return Error
|
|
RTS
|
|
JOYSTT: DC #%10000000,#%01000000
|
|
|