I can't quote the issue and page but I do recall there being an article in Portable 100 magazine about connecting a joystick to the Model T computers.
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Mon, Jan 4, 2021 at 10:41 PM Daryl Tester < dt-m...@handcraftedcomputers.com.au> wrote: > On 5/1/21 6:24 am, Jim Anderson wrote: > > > As I recall, the way it worked was that the five switches (directional > > switches and fire) were wired to the first five output bits, and the > > common return from all five switches was wired to BUSY. To poll the > > joystick you'd cycle through outputting ASCII 1, 2, 4, 8, and 16, and > > read BUSY each time. Whichever bits resulted in assertion of BUSY > > meant that switch was currently closed. > > Probably need diodes in there as well, to stop from inadvertantly > driving an output low and high at the same time if the joystick > had more than one switch closed (e.g. up and fire). > > Cheers, > --dt > -- *"I will never in my lifetime make a film that cannot be seen by the whole family"* Arther P. Jacobs
