Search found 91 matches

by XorA
Fri May 23, 2014 10:40 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 73294

Re: ZX80 Core - new ZX80 motherboards

40 SMD micro switches later and I now have the keyboard mounted on the zx80core.

Absolutely fantastic.

G
zx80core-keyboard.jpg
zx80core-keyboard.jpg (188.49 KiB) Viewed 3367 times
by XorA
Tue May 20, 2014 3:30 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 73294

Re: ZX80 Core - new ZX80 motherboards

*goes off to find his white stick*
by XorA
Tue May 20, 2014 2:57 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 73294

Re: ZX80 Core - new ZX80 motherboards

I am probably being really blind, but the Composite/Phono socket is missing from the parts list. I guess thats because it doesn't have a JXX number on the board.

G
by XorA
Sun May 18, 2014 6:56 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 73294

Re: ZX80 Core - new ZX80 motherboards

The place where you put the v1.0 manuals seems to be down, I should really get my v1.0b board up and running as well :-D
by XorA
Sun May 18, 2014 12:50 am
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 73294

Re: ZX80 Core - new ZX80 motherboards

As a bonus this was the first time I had a chance to use logic analiser properly since I bought it years ago :-)
by XorA
Sun May 18, 2014 12:47 am
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 73294

Re: ZX80 Core - new ZX80 motherboards

About the SMD capacitors - I gave one more 10uF just to have a different amount of each capacitor value to distinct them. Unfortunately the values are not printed on. Yeah, I just got over eager and soldered the two, I went back and checked the parts list and realised what I had done. Now I need to...
by XorA
Sat May 17, 2014 11:54 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 73294

Re: ZX80 Core - new ZX80 motherboards

Found it, got confused with the SMD caps and fitted C97 with a 10uF, replaced with the 1nF and I have the magic K :-)
by XorA
Sat May 17, 2014 10:16 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 73294

Re: ZX80 Core - new ZX80 motherboards

ZX80-Core-A15-SYNC-PIXEL.jpg
(169.55 KiB) Downloaded 347 times
A15
Sync
Pixel

I have the bottom two positions of J96 (NMI) jumpered, top of J98.

Am I supposed to do anything with J94? Instructions are a little confusing around that, I have fitted SMDs to back, TV seems happy with signal apart from it being all black.
by XorA
Sat May 17, 2014 8:13 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 73294

Re: ZX80 Core - new ZX80 motherboards

Built my zx80core today \o/

Unfortunately it is a bit too goth for me in that in only outputs black on black :-(

My A15 seems to agree with the debugging guide.
ZX80-Core-A15.jpg
(174.9 KiB) Downloaded 162 times
I do not currently have access to my Oscilloscope only USB logic analyser :-(
by XorA
Mon May 12, 2014 11:25 am
Forum: Hardware
Topic: looking for someone in London to help me troubleshoot a ZX81
Replies: 22
Views: 4375

Re: looking for someone in London to help me troubleshoot a

That easycap really struggles with the non-standard signals from most retro computers, I will be surprised if you get a valid pic from a zx81 :-(