Search found 174 matches

by Erm
Fri May 29, 2020 7:03 pm
Forum: Hardware
Topic: ZX80 Jumper A - B or A - C, purpose?
Replies: 6
Views: 775

Re: ZX80 Jumper A - B or A - C, purpose?

I did wonder about the French TV standards, because it doesn't seem to match the norms for UK/Europe or USA (it has no D11). It came from Austria, but who knows where it came from originally.
by Erm
Fri May 29, 2020 4:56 pm
Forum: Hardware
Topic: ZX80 Jumper A - B or A - C, purpose?
Replies: 6
Views: 775

ZX80 Jumper A - B or A - C, purpose?

Hello, I cannot find a definitive answer on this. I know it has something to do with the video output. On this ZX80 I got today, the PCB connection that is normally present between the A and C positions has been cut and instead there is a new connection from A to B. I can see that it selects between...
by Erm
Wed May 27, 2020 9:57 pm
Forum: Hardware
Topic: Controlling relays from exp port, I/O.
Replies: 3
Views: 815

Re: Controlling relays from exp port, I/O.

Ah yes, it's ZX Spectrum related, sorry.

Excellent, I'll see if he has the German version of the manual and point him at the IN/OUT section and forward your info.
by Erm
Wed May 27, 2020 5:00 pm
Forum: Hardware
Topic: Controlling relays from exp port, I/O.
Replies: 3
Views: 815

Controlling relays from exp port, I/O.

A Spec-chum of mine here in Germany wants to drive some relays from his Spectrum (some kind of programmable robotic arm is his aim I believe). I said I'd ask some questions for him as I don't think he can speak English that well. He seems fairly competent with electronics, at least competent enough ...
by Erm
Mon May 25, 2020 6:55 pm
Forum: WANTED
Topic: WANTED: Orig. ZX80 ROMs
Replies: 0
Views: 1575

WANTED: Orig. ZX80 ROMs

My 2x ZX80's have been upgraded to ZX81 ROMs in the past and as I have tons (almost) of ZX81's I'd very much like to fit the original ROMs to the ZX80's so that I can sleep better at night.

So, looking for 1 or 2 original ROM chips, willing to pay stupid money for them ;)
by Erm
Sun May 24, 2020 12:19 am
Forum: Hardware
Topic: ZX81 rebuild
Replies: 175
Views: 34547

Re: ZX81 rebuild

I just got one of these off eBay, possibly from someone on here? 733632C1-0559-4558-B954-A604D17E48F9.jpeg Loving the keyring! Nice bonus. 8-) Bloody 'ell, just got back onto the forum after days of no access due to that server issue, forgetting my password and the recovery option always resulting ...
by Erm
Mon May 11, 2020 12:22 pm
Forum: Development
Topic: New ZX80 cases
Replies: 27
Views: 8405

Re: New ZX80 cases

Not wholly correct. Only the issue one ZX80's made by Tek Electronics were "yoghurt pot" plastic, the Timex made issue 2's were made of the same ABS plastic as the ZX81 and survived just as well as the rest of the Sinclair range albeit in lesser numbers. The so called "mint" ZX80s on ebay tend to b...
by Erm
Sun May 10, 2020 9:08 pm
Forum: Development
Topic: New ZX80 cases
Replies: 27
Views: 8405

Re: New ZX80 cases

That all sounds like a fun new jazzed-up QL case. Apart from slight warping and general wear and tear, the original QL cases have held out very well. Not so for the very fragile ZX80 enclosures made of yoghurt pot. They seem to break a lot and being white originally, they also go beige in the sun. I...
by Erm
Sun May 10, 2020 12:10 am
Forum: Development
Topic: New ZX80 cases
Replies: 27
Views: 8405

Re: New ZX80 cases

Can't see anything new on the fb group? Has this stalled for now?
by Erm
Thu May 07, 2020 6:55 pm
Forum: Hardware
Topic: Homemade 64K RAM pack
Replies: 10
Views: 5245

Re: Homemade 64K RAM pack

Many thanks. Connections look good. It's the homemade one as in the first post. It certainly seems to work ok, at least as a 16k RAM pack as I've loaded 16k games with it attached. I suppose who knows what the original maker did, but due to the 8x 8k RAM chips I suspected it was supposed to be a 64k...