Search found 66 matches

by albertusj
Tue Dec 10, 2019 8:40 pm
Forum: Hardware
Topic: ZX80 no "K" prompt
Replies: 12
Views: 1636

Re: ZX80 no "K" prompt

Check out the second build at the bottom of my web page:

http://www.myprius.co.za/ZX80.htm
by albertusj
Tue Dec 10, 2019 10:59 am
Forum: Hardware
Topic: ZX80 no "K" prompt
Replies: 12
Views: 1636

Re: ZX80 no "K" prompt

C11 was missing! I forgot to put in one tiny 47pF capacitor. I'm such an idiot!

It gives a "K" prompt now. Thanks, everybody for trying to help.

:-)
by albertusj
Mon Dec 09, 2019 3:47 pm
Forum: Hardware
Topic: ZX80 no "K" prompt
Replies: 12
Views: 1636

Re: ZX80 no "K" prompt

I plugged in a known working RAM pack (which disables onboard RAM) and also swapped in a known working CPU to no avail. :|
by albertusj
Mon Dec 09, 2019 3:31 pm
Forum: Hardware
Topic: ZX80 no "K" prompt
Replies: 12
Views: 1636

Re: ZX80 no "K" prompt

http://www.myprius.co.za/zx80error.zip

Sorry for the ZIP file, but I wanted to get as high rez as possible. Two photos of the early build snuck in. :-)

Thank you for trying to help.
by albertusj
Mon Dec 09, 2019 3:06 pm
Forum: Hardware
Topic: ZX80 no "K" prompt
Replies: 12
Views: 1636

Re: ZX80 no "K" prompt

I'll upload a picture, but there's not much to see. It looks EXACTLY like it does when the K is present (along with all the normal background image artefacts), there's just no "K".
by albertusj
Mon Dec 09, 2019 1:45 pm
Forum: Hardware
Topic: ZX80 no "K" prompt
Replies: 12
Views: 1636

ZX80 no "K" prompt

I was hoping someone could assist me. I built a ZX80 kit which follows the original 1980 track layout. The machine produces a raster complete with little distortions every few pixels and a little kink at the bottom. Exactly as my other working board does, except the "K" prompt is missing. I have tes...
by albertusj
Sun Nov 24, 2019 9:22 am
Forum: Hardware
Topic: How to clean a tape signal !
Replies: 1
Views: 434

Re: How to clean a tape signal !

Impressive! :ugeek:
by albertusj
Sun Nov 24, 2019 9:19 am
Forum: Hardware
Topic: ZX80 to HDMI
Replies: 0
Views: 1696

ZX80 to HDMI

I have a ZX80 built from a kit along with a back porch generator. The image is beautiful on my Sony CRT monitor and SAMSUNG 60inch plasma TV. I want a smaller monitor to work on though. Can anybody recommend an AV to HDMI converter that works with the oddball ZX80 video timing? It should also mainta...
by albertusj
Sun Oct 20, 2019 4:03 pm
Forum: SALES
Topic: QL books for sale...or FREE
Replies: 4
Views: 2791

Re: QL books for sale...or FREE

Thank you for the tip.
by albertusj
Sun Oct 20, 2019 4:01 pm
Forum: SALES
Topic: QL Software for sale. BIG haul!
Replies: 0
Views: 3424

QL Software for sale. BIG haul!

I'm selling a large lot of QL software. The cartridges are all still in very good to excellent condition. Sinclair QL Software Quill, QSpell, Abacus, Archive, Easel, TASCOPY, TASPRINT plus User Guide Also included is a box of assorted mystery cartridges. https://www.ebay.com/itm/223704279009 Regards...