Search found 64 matches

by Simon_Carr
Mon Aug 08, 2022 6:21 pm
Forum: Hardware
Topic: Coils….
Replies: 6
Views: 1862

Re: Coils….

Hi Mark,
Just removed TR4, and I get Open Circuit on all combinations. Occasionally I get a very high (5 MOhm) reading, but never consistent, and usually flashes straight to open. If it was working, what would removing TR4 result in?

Cheers,

Simon
by Simon_Carr
Sun Aug 07, 2022 8:47 pm
Forum: Hardware
Topic: Coils….
Replies: 6
Views: 1862

Re: Coils….

BTW it was my daughter holding the probes, with her yellow nail varnish!
by Simon_Carr
Sun Aug 07, 2022 8:46 pm
Forum: Hardware
Topic: Coils….
Replies: 6
Views: 1862

Re: Coils….

Hi Mark Yes, I’m testing using two multimeters (one manual, the other auto-ranging), and off the board the coils are all fine. They look good as well, and I can see no damage to the wires connecting to the pins. However, I have just tested the board, with the coil removed, and that is where the prob...
by Simon_Carr
Sun Aug 07, 2022 5:56 pm
Forum: Hardware
Topic: Building a ZX Spectrum 3B, Looking for Parts
Replies: 6
Views: 3716

Re: Building a ZX Spectrum 3B, Looking for Parts

Hi DistantStar,
I was wondering whether you ever resolved your coil query, as I’ve been doing a similar build, and was wondering about alternatives to the original coils….
by Simon_Carr
Sun Aug 07, 2022 5:50 pm
Forum: Hardware
Topic: Coils….
Replies: 6
Views: 1862

Coils….

I have about 4-5 coils from Spectrums that seem to be fine when tested for the resistances when not in circuit (open between, minimal/zero within windings) , but when I solder them into place onto a board I lose the open circuit between windings. I have checked for sloppy soldering or splash, and ha...
by Simon_Carr
Thu May 26, 2022 8:16 pm
Forum: ZX Spectrum Lounge
Topic: ZX Interface 1, DivMMC and Multiface 128 query
Replies: 1
Views: 2069

Re: ZX Interface 1, DivMMC and Multiface 128 query

Aha! I have now been able to answer this one, with the help of this excellent resource:
https://www.bytedelight.com/?page_id=3605

Hmmm…. thinking of different ways to do this now….
by Simon_Carr
Wed May 25, 2022 10:33 pm
Forum: ZX Spectrum Lounge
Topic: ZX Interface 1, DivMMC and Multiface 128 query
Replies: 1
Views: 2069

ZX Interface 1, DivMMC and Multiface 128 query

I’ve finally got close to my perfect ZX Spectrum setup: My original 48k rubber key Speccy, refurbished with s-video output ZX Interface 1 and some microdrive units ZX Interface 2 and a RAM Turbo (not relevant to this post) Multiface 128 Now, I have been using the Multiface to create images of games ...
by Simon_Carr
Fri May 13, 2022 2:15 pm
Forum: Hardware
Topic: ZX Interface 1 issue
Replies: 10
Views: 2823

Re: ZX Interface 1 issue

Curiouser and curiouser…. So, after a bit of thinking on the responses to my post, I tried the new Z80s that did not detect the ZX interface 1 or microdrives, and therefore suspected of having a broken M1 line with another Spectrum. Again, no joy with Interface 1, but I tried my DivMMC Enjoy! as wel...
by Simon_Carr
Thu May 12, 2022 9:06 pm
Forum: Hardware
Topic: ZX Interface 1 issue
Replies: 10
Views: 2823

Re: ZX Interface 1 issue

UPDATE: Okay, I now have Interface 1 working, and loading micro drives very happily..... BUT... None of my modern Zilog Z80's would page ZX Interface 1, and the one that is working quite happily dates from 1986... And I tried 3 new Z80s! Curious, as I thought the newer ones were supposed to be much ...
by Simon_Carr
Thu May 12, 2022 6:51 pm
Forum: Hardware
Topic: ZX Interface 1 issue
Replies: 10
Views: 2823

Re: ZX Interface 1 issue

Ironically, I think that is where the chip might have come from! Not to worry, I’ve got a boxful of Z80s, I’m sure I’ll find one. Just in case, is there anything else that could cause this issue? I’ve cleaned and re-tinned the edge connector, and I don’t think there is any solder splash or similar, ...