Search found 654 matches

by Pr0f
Thu Sep 24, 2020 9:01 am
Forum: Hardware
Topic: Noddy Keyboard Almost
Replies: 17
Views: 1138

Re: Noddy Keyboard Almost

Tetroid might even be persuaded to release his adaptor board as a separate product, then you could make use of that...
by Pr0f
Thu Sep 24, 2020 8:57 am
Forum: The Off-Topic Section
Topic: Happy Birthday!
Replies: 272
Views: 84548

Re: Happy Birthday!

Happy Birthday to Nasta :-)
by Pr0f
Tue Sep 22, 2020 9:10 pm
Forum: Software & Programming
Topic: QL USER type-in programs
Replies: 24
Views: 917

Re: QL USER type-in programs

The poke of the screen register will not change the screen mode in qdos - only for the hardware
by Pr0f
Tue Sep 22, 2020 7:43 am
Forum: Hardware
Topic: PS/2 Keyboard Musings
Replies: 3
Views: 166

Re: PS/2 Keyboard Musings

Let's keep it simple and start with the PS/2 to QL matrix idea: Tasks you would have to do: 1) Send some codes to the keyboard to set it up - the routine you have from Adrian Black may be able to do this already. 2) Listen for keys on the PS/2 keyboard - the keyboard will generate a 'key down' and '...
by Pr0f
Sun Sep 20, 2020 9:22 am
Forum: Hardware
Topic: QL keyboard mod
Replies: 20
Views: 1229

Re: QL keyboard mod

Also worth a good look :

http://www.kbdbabel.org/
by Pr0f
Sun Sep 20, 2020 9:15 am
Forum: Hardware
Topic: QL keyboard mod
Replies: 20
Views: 1229

Re: QL keyboard mod

This pdf has some great info for ps/2 / AT keyboard and how it works: https://stardot.org.uk/forums/download/file.php?id=16103&sid=ee455101baf4ad5f2400aa442fe09dab This is from the following article: https://stardot.org.uk/forums/viewtopic.php?t=9461 Attempting to get a PS/2 keyboard from origin...
by Pr0f
Sat Sep 19, 2020 2:42 pm
Forum: Hardware
Topic: HAL equations / JED for use in a GAL chip
Replies: 7
Views: 305

Re: HAL equations / JED for use in a GAL chip

Not sure - but with a 150pf capacitor in there it was quasi stable, with 47pf it is rock solid with repeatable results. 2nd back of memory was down to pin14 on the D1 RAM not being soldered - time for another eye test - but 2 joints out of a couple of hundred isn't bad. ordered a new reset switch (d...
by Pr0f
Sat Sep 19, 2020 10:04 am
Forum: Hardware
Topic: HAL equations / JED for use in a GAL chip
Replies: 7
Views: 305

Re: HAL equations / JED for use in a GAL chip

Thank you Vitaliy, Not sure what value I put in there - it was a low value - but I will make sure it is 47Pf. I also need to replace my reset switch as the original QL one I've used is not playing well, they are such a poor design. What switch part did you use in your design for the reset switch? Da...
by Pr0f
Fri Sep 18, 2020 4:04 pm
Forum: Hardware
Topic: HAL equations / JED for use in a GAL chip
Replies: 7
Views: 305

Re: HAL equations / JED for use in a GAL chip

Thanks Marcus - I am using a 'D' variant at 15ns - I have some 'A' variants at 25ns coming my way in the next few days - I will try again. Symptoms with the D are a bit odd! 1488 chip got a bit warm - but it could be a bad one - running tests without that in place Memory detected by Minerva on power...
by Pr0f
Fri Sep 18, 2020 11:09 am
Forum: Hardware
Topic: HAL equations / JED for use in a GAL chip
Replies: 7
Views: 305

HAL equations / JED for use in a GAL chip

Has anyone programmed a GAL 16V8 with the JED code that was published (I think it's in the distribution and also on Dilwyns site too).

I noted the comment about using a slower GAL - got some on order - but was interested if anyone had done this and what was the result ?