Search found 1331 matches

by RWAP
Thu Dec 27, 2018 12:57 pm
Forum: Hardware
Topic: ZX81 loading of programs not working
Replies: 25
Views: 5966

Re: ZX81 loading of programs not working

I now that some people still mix up the EAR and MIC sockets - on a ZX81 they share the same circuit (as far as I recall), which doesn't help, but you need to ensure that to load programs, the lead is plugged into the EAR socket!
by RWAP
Fri Dec 21, 2018 10:02 pm
Forum: Development
Topic: Making Keyboard Membranes
Replies: 14
Views: 4300

Re: Making Keyboard Membranes

Here https://www.smart-prototyping.com you can get flexible PCBs for ZX81 keyboard size for $480 for 10. That is $48 each. They make flexible pcbs down to 0.1mm. Except they are based in China - so you also have to add on US taxes and potentially import duties as well - will be close the $60 each a...
by RWAP
Fri Dec 21, 2018 9:26 am
Forum: Development
Topic: Making Keyboard Membranes
Replies: 14
Views: 4300

Re: Making Keyboard Membranes

I did start a discussion a few years ago about CoCo membranes but there was just not enough interest - and not helped by several different membranes in these machines. The main market seems to be in the USA and so ideally you need a manufacturer in the US because of the costs of importing them etc. ...
by RWAP
Wed Dec 19, 2018 8:16 pm
Forum: Hardware
Topic: ZX81 Some keys not working
Replies: 22
Views: 4696

Re: ZX81 Some keys not working

You have a ZXpand Keyboard Membrane (blue tails). We had an issue with the bonding of the silver ink on some of these (the factory are still not sure why) so the easiest is to send you a replacement. However, it could also indicate that some of the pins inside the molex connectors are corroded or be...
by RWAP
Wed Dec 19, 2018 12:49 pm
Forum: Hardware
Topic: ZX81 Some keys not working
Replies: 22
Views: 4696

Re: ZX81 Some keys not working

Thanks for the pictures XavSnap - that is helpful as we can all see the keys link to the middle pin in the 5 way connector.

It will be interesting to see what the issue is....
by RWAP
Wed Dec 19, 2018 12:34 pm
Forum: Development
Topic: Making Keyboard Membranes
Replies: 14
Views: 4300

Re: Making Keyboard Membranes

I was actually looking to see if anyone had any information about, or experience with, making membranes... I have a number of retro machines for which no one's producing replacements, so I'm doing some research to see how feasible it would be to do runs of them. -John- I have quite extensive experi...
by RWAP
Wed Dec 19, 2018 12:22 pm
Forum: Development
Topic: Making Keyboard Membranes
Replies: 14
Views: 4300

Re: Making Keyboard Membranes

I am working on this without using mass production molds... the reason was to make membranes that had no keyboard labels that could be customized. Otherwise use Retroradionics for replacement membranes. Charles Charles - I am actually going to have a short production run of ZX81 membranes with a bl...
by RWAP
Tue Dec 18, 2018 10:52 pm
Forum: Hardware
Topic: ZX81 Some keys not working
Replies: 22
Views: 4696

Re: ZX81 Some keys not working

It is possible that the membrane has a fault - but the first thing to check is to short the 5 way connector with the 8 way using a piece of wire. Also check that are no pieces of the old membrane inside either connector (sometimes a tiny sliver is left behind). The pins on the connectors can also be...
by RWAP
Wed Oct 24, 2018 7:59 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 86
Views: 35714

Re: Jupiter ACE (again)

Excellent - do you plan on offering these for sale?
by RWAP
Sat Oct 20, 2018 4:37 pm
Forum: Sinclair Misc
Topic: gamesTM and the Sinclair ZX81
Replies: 5
Views: 2036

Re: gamesTM and the Sinclair ZX81

I have just messaged gamesTM on Facebook - apparently 1st November will be their final issue, so I asked if they would consider uploading the magazines to the internet to form an archive ! I also asked if they had PDFs of the issues you mention.