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Adjusted to recent driver interface change.

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Please note that this change is absolutely untested!

Apart from the recent driver interface change:
- vic20-stdjoy.s was "slightly broken" because it didn't clear x on return from joy_read.
- vic20-ptvjoy.s was "heavily broken" because it returned a totally different set of bits of the first joystick.
This commit is contained in:
Oliver Schmidt
2017-08-20 16:39:07 +02:00
parent 20c85c8a1c
commit acf831658f
2 changed files with 32 additions and 10 deletions
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17
libsrc/vic20/joy/vic20-stdjoy.s
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@@ -112,10 +112,21 @@ READ: lda #$7F ; mask for VIA2 JOYBIT: sw3
sty VIA1_DDRA ; restore the state of DDRA
cli ; necessary?
ror ; Shift sw3 into bit 7
and #$9E ; Mask relevant bits
eor #$9E ; Active states are inverted
php ; Save sw3 in carry
lsr ; Shift sw0,sw1,sw2,sw4 into bits 1-4
tax ; Save sw0,sw1,sw2
and #$10 ; Extract sw4 in bit 4
sta tmp1 ; Save sw4 in bit 4
txa ; Restore sw0,sw1,sw2
lsr ; Shift sw0,sw1,sw2 into bits 0-2
and #$07 ; Mask bits 0-2
plp ; Restore sw3 in carry
bcc @L0 ; Is sw3 set?
ora #$08 ; Yes: Add sw3 in bit 3
@L0: ora tmp1 ; Add sw4 in bit 4
eor #$1F ; Active states are inverted
ldx #0
rts