https://youtu.be/EJCFu95eAxI
Nice Fun.. Thanks!
Search found 15 matches
- Fri Mar 22, 2019 12:40 pm
- Forum: ZX BASIC
- Topic: 1k bouncing ball
- Replies: 5
- Views: 5164
- Thu Mar 21, 2019 9:59 pm
- Forum: Hardware
- Topic: Keyboard Issues .. Some keys not working (new membrane)
- Replies: 11
- Views: 5243
Re: Keyboard Issues .. Some keys not working (new membrane)
Ok so that was a clue.. I found a short but couldnt see where.. I ended up purchasing a microscope, and within 10 minutes of setting it up I saw the issue. https://i.ibb.co/X7Psq3G/closeup.jpg Scraped it with an x-acto knife a tiny bit.. and the whole keyboard works! Now, it crashes when loading fro...
- Wed Mar 20, 2019 6:03 pm
- Forum: Hardware
- Topic: Keyboard Issues .. Some keys not working (new membrane)
- Replies: 11
- Views: 5243
Re: Keyboard Issues .. Some keys not working (new membrane)
Thanks for the replies again all! At this point I'd not even thought of getting my multimeter out despite using it to do initial tests ! :) I'm pretty new to this and learning a lot as I go, these small hints send me down a path that I can investigate and learn more. (I've been working my way throug...
- Wed Mar 20, 2019 2:07 pm
- Forum: Hardware
- Topic: Keyboard Issues .. Some keys not working (new membrane)
- Replies: 11
- Views: 5243
Re: Keyboard Issues .. Some keys not working (new membrane)
the latest list is; 3 E D X 8 I K M looking at the schematic (Is there anything better for the issue one?) http://www.zx81.de/bilder/ts1500_600.gif All the faulty keys run to KBD2 on the ULA. So, with that In mind I traced it on the board and made sure the soldered joint was all good So, the situati...
- Wed Mar 20, 2019 1:59 pm
- Forum: Hardware
- Topic: Keyboard Issues .. Some keys not working (new membrane)
- Replies: 11
- Views: 5243
Re: Keyboard Issues .. Some keys not working (new membrane)
Aha thanks for that idea. I tried that and pretty much get the same issue (Apart from 1-5 were actually working. And most of the 'duff' keypresses cause a crash. So I guess next step is to try and log which combinations are duff and map that to a schematic to figure out the cause. \ My concern with ...
- Wed Mar 20, 2019 8:18 am
- Forum: Hardware
- Topic: Keyboard Issues .. Some keys not working (new membrane)
- Replies: 11
- Views: 5243
Re: Keyboard Issues .. Some keys not working (new membrane)
Oops sorry, zx81 Issue One !
- Tue Mar 19, 2019 11:06 pm
- Forum: Hardware
- Topic: Keyboard Issues .. Some keys not working (new membrane)
- Replies: 11
- Views: 5243
Keyboard Issues .. Some keys not working (new membrane)
Hey all .. again.. I recently added a new ULA and a new keyboard membrane.. but some keys are not working. Tried reheating the ULA joins and still same .. but perhaps I can identify the issue to a pin. 8 actually causes the whole thing to crash.. but the following keys don't work at all ; 1 2 3 4 5 ...
- Thu Mar 14, 2019 12:33 am
- Forum: Hardware
- Topic: Hello All & Dead ZX .. probably
- Replies: 16
- Views: 6986
- Thu Mar 14, 2019 12:31 am
- Forum: Hardware
- Topic: Hello All & Dead ZX .. probably
- Replies: 16
- Views: 6986
Re: Hello All & Dead ZX .. probably
Ok I was wrong, the new ULA does work!! Keyboard is a bit iffy, but for now, I'm happy!
- Wed Mar 13, 2019 6:10 pm
- Forum: Hardware
- Topic: Hello All & Dead ZX .. probably
- Replies: 16
- Views: 6986
Re: Hello All & Dead ZX .. probably
Oh well, I tried first the CCB because it was the least disruptive, which didnt work, followed by a new ULA, which also results in the same video signal. I guess now the only thing left to do is replace the other chips!