userport joystick code

[vicassembly]

I did a brief scan for userport joystick code. Does anyone have a link or example of a basic routine or a documented ML routine?

I dug through the hattrick program and seem to have found the following. Any other help would be appreciated.


read_pl2_userport:
ldx #0
lda #$80
sta $9112
sta $9110
lda $9110
stx $9112
eor #$ff
and #$1f
rts

[majikeyric]

http://sleepingelephant.com/ipw-web/bul ... f=2&t=8070

[vicassembly]

Thanks.

For documentation purposes, I found the following links to Compute! articles.

https://www.atarimagazines.com/compute/ ... YSTICK.php

https://archive.org/details/1983-03-com ... /page/n141