Search found 110 matches

by Erm
Sun Jan 12, 2020 6:43 pm
Forum: Hardware
Topic: Homemade German Interface, for what?
Replies: 3
Views: 251

Re: Homemade German Interface, for what?

I see. Didn't realise it wasn't a normal Z80.
by Erm
Sun Jan 12, 2020 2:48 pm
Forum: Hardware
Topic: Homemade German Interface, for what?
Replies: 3
Views: 251

Homemade German Interface, for what?

Just spotted this (it's not mine). Some kind of homemade interface. Looks like a Z80 on it. From the short connector I'd assume it was for a ZX81.

But what does it do?

https://www.ebay.de/itm/I-O-Interface-m ... 3366882732
by Erm
Sat Jan 11, 2020 7:12 pm
Forum: WANTED
Topic: ZX8-CCB, where's Karl-Heinz?
Replies: 5
Views: 224

Re: ZX8-CCB, where's Karl-Heinz?

I bought a couple I think in Nov/Dec and then he put up a message (as an item) saying that he would be away to the 3rd Jan.
by Erm
Sat Jan 11, 2020 6:52 pm
Forum: WANTED
Topic: ZX8-CCB, where's Karl-Heinz?
Replies: 5
Views: 224

Re: ZX8-CCB, where's Karl-Heinz?

Ok. If you 'see' him, tell him I'd like 5x ZX8-CCB's. I know they take time and parts to make, but there must be an Aldi shopping basket for him at the end of it ;)
by Erm
Sat Jan 11, 2020 6:39 pm
Forum: WANTED
Topic: ZX8-CCB, where's Karl-Heinz?
Replies: 5
Views: 224

ZX8-CCB, where's Karl-Heinz?

Anyone know what has happened to Karl-Heinz lately? No response on SMR and I could do with some ZX8-CCB's (also, in case anyone else has a couple spare).

Hope he's alright.
by Erm
Sun Dec 29, 2019 2:22 pm
Forum: Hardware
Topic: ZX80 troubleshooting with oscilloscope.
Replies: 8
Views: 361

Re: ZX80 troubleshooting with oscilloscope.

Good idea. But it is proving quite tricky! I shall persevere.
by Erm
Sat Dec 28, 2019 10:08 pm
Forum: Hardware
Topic: ZX80 troubleshooting with oscilloscope.
Replies: 8
Views: 361

Re: ZX80 troubleshooting with oscilloscope.

Everything on the Z80 and the RAM looks the same as the known good ZX80, as far as I can tell.
by Erm
Sat Dec 28, 2019 9:27 pm
Forum: Hardware
Topic: ZX80 troubleshooting with oscilloscope.
Replies: 8
Views: 361

Re: ZX80 troubleshooting with oscilloscope.

Ignore the above. One was set to AC, the other DC!
by Erm
Sat Dec 28, 2019 8:11 pm
Forum: Hardware
Topic: ZX80 troubleshooting with oscilloscope.
Replies: 8
Views: 361

Re: ZX80 troubleshooting with oscilloscope.

Edit: IGNORE this post, I noticed one probe was set to AC and the other DC! Ok, I think there is activity where there should be and highs where they should be. I compared the dodgy new ZX80 to my known good original. Here is a pic showing the read out for pin 16 on the Z80. Yellow is the good one, ...
by Erm
Sat Dec 28, 2019 5:04 pm
Forum: Hardware
Topic: ZX80 troubleshooting with oscilloscope.
Replies: 8
Views: 361

Re: ZX80 troubleshooting with oscilloscope.

Thanks so much Mark. I will check those things in due course. I did also try with a known good 16k RAM pack and there was no change. The RAM chips I got with the board are: MM2114N-2L and MM2114-3. Interesting about them having to be different, as I changed them for 2 from a ZX81 (because I knew bot...