Joypad reading

by **Conn** Wed 9 Apr 2014 - 17:10

I currently try to hack a bit for bszelda again, making Roto's patch more Hardware compatible. While the Joypad Input works wonderful in snes9x/zsnes... bsnes and higan (and real Hardware) make Troubles.

I was able to trace a bit was higan actually does and here it is:

Code:: ced717 beq $d6f7 [ced6f7] A:6000 X:0004 Y:0082 S:1ff5 ced6f7 lda $4219 [004219] A:6000 X:0004 Y:0082 S:1ff5 ced6fa and #$20 A:6001 X:0004 Y:0082 S:1ff5 ced6fc beq $d712 [ced712] A:6000 X:0004 Y:0082 S:1ff5 ced712 lda $4219 [004219] A:6000 X:0004 Y:0082 S:1ff5 ced715 and #$10 A:6001 X:0004 Y:0082 S:1ff5 ced717 beq $d6f7 [ced6f7] A:6000 X:0004 Y:0082 S:1ff5 ced6f7 lda $4219 [004219] A:6000 X:0004 Y:0082 S:1ff5 ced6fa and #$20 A:6001 X:0004 Y:0082 S:1ff5 ced6fc beq $d712 [ced712] A:6000 X:0004 Y:0082 S:1ff5 ced712 lda $4219 [004219] A:6000 X:0004 Y:0082 S:1ff5 ced715 and #$10 A:6001 X:0004 Y:0082 S:1ff5 ced717 beq $d6f7 [ced6f7] A:6000 X:0004 Y:0082 S:1ff5 ced6f7 lda $4219 [004219] A:6000 X:0004 Y:0082 S:1ff5 ced6fa and #$20 A:6002 X:0004 Y:0082 S:1ff5 ced6fc beq $d712 [ced712] A:6000 X:0004 Y:0082 S:1ff5 ced712 lda $4219 [004219] A:6000 X:0004 Y:0082 S:1ff5 ced715 and #$10 A:6002 X:0004 Y:0082 S:1ff5 ced717 beq $d6f7 [ced6f7] A:6000 X:0004 Y:0082 S:1ff5 ced6f7 lda $4219 [004219] A:6000 X:0004 Y:0082 S:1ff5 ced6fa and #$20 A:6002 X:0004 Y:0082 S:1ff5 ced6fc beq $d712 [ced712] A:6000 X:0004 Y:0082 S:1ff5 ced712 lda $4219 [004219] A:6000 X:0004 Y:0082 S:1ff5 ced715 and #$10 A:6004 X:0004 Y:0082 S:1ff5 ced717 beq $d6f7 [ced6f7] A:6000 X:0004 Y:0082 S:1ff5 ced6f7 lda $4219 [004219] A:6000 X:0004 Y:0082 S:1ff5 ced6fa and #$20 A:6004 X:0004 Y:0082 S:1ff5

Has anybody an idea why repeated read of $4219 Counts up (1,2,4,8...)? Normally you press a button, it is stored to this Register and that's it. Somehow in Roto's menu the Input (I pressed select here, which usually is #$20) is counted up.