The Centronics standard has 5 dedicated input status lines. And you only need 5 signal pins for an Atari joystick.
Is it possible to read the pins directly? If so, then it should be possible. Tom Wilson wilso...@gmail.com (619)940-6311 K6ABZ On Mon, Jan 4, 2021 at 11:42 AM Stephen Adolph <twospru...@gmail.com> wrote: > m100 parallel port is output only except for the printer status lines. > GPO yes but not GPI... > > > On Mon, Jan 4, 2021 at 2:39 PM Tom Wilson <wilso...@gmail.com> wrote: > >> > Seems to me that somebody had a scheme a while back where the joystick >> interfaced with the parallel port and status was polled that way (this >> avoids having to build a custom interface). >> >> Yeah, we used to use the parallel port for a lot of things, back in the >> DOS days; it doesn't take much to make it an 8-bit GPIO, and I used to have >> a sound "card" that used the parallel port. >> >> I think there are just enough status lines to pull off using it for a >> joystick: >> >> >> https://en.wikipedia.org/wiki/Parallel_port#/media/File:25_Pin_D-sub_pinout.svg >> >> Tom Wilson >> wilso...@gmail.com >> (619)940-6311 >> K6ABZ >> >>> >>>
