Search found 56 matches

by albertusj
Tue Oct 15, 2019 3:01 pm
Forum: SALES
Topic: QL books for sale...or FREE
Replies: 2
Views: 229

Re: QL books for sale...or FREE

Didn't sell. Anyone want some QL books?
by albertusj
Thu Oct 10, 2019 10:47 am
Forum: Welcome Area
Topic: Hi from South-Africa
Replies: 1
Views: 168

Hi from South-Africa

Hello, friends My first contact with a computer was an Apple II we had at school in about 1983/4. I didn't get to use it but I saw it working and eventually got to play chess on it (badly) when I was about 8 or 9. At 10 I took a programming course in BASIC along with my older brothers and in about 1...
by albertusj
Thu Oct 10, 2019 10:35 am
Forum: SALES
Topic: QL books for sale...or FREE
Replies: 2
Views: 229

QL books for sale...or FREE

Hi everyone,

I put some QL books on ebay.

https://www.ebay.com/itm/223697303575

If they don't sell I'll donate them to anyone on here who is willing to pay for shipping. Otherwise, they'll just stand in my bookshelf since I don't own any QLs.
by albertusj
Sat Oct 05, 2019 9:26 pm
Forum: Hardware
Topic: Help diagnosing Issue 2
Replies: 3
Views: 317

Re: Help diagnosing Issue 2

Right-click on the image and say "Open in new tab". A bigger version will load. There has been some repair/modifications done to the board by a Sinclair service technician by the time I got it.
by albertusj
Sat Oct 05, 2019 6:09 pm
Forum: Hardware
Topic: Help diagnosing Issue 2
Replies: 3
Views: 317

Help diagnosing Issue 2

I get this picture upon boot:

Image

Image

Is it possible to tell which RAM chip (if it is RAM) has failed? I measured the voltages at the RAM chips and they are all normal.
by albertusj
Wed Aug 07, 2019 4:27 pm
Forum: Hardware
Topic: ZX80 issue 2 kit does not start
Replies: 9
Views: 632

Re: ZX80 issue 2 kit does not start

yes, but try a 6.5536MHz crystal also.
by albertusj
Tue Aug 06, 2019 1:16 pm
Forum: Hardware
Topic: Harlequin ZX Spectrum
Replies: 3
Views: 576

Harlequin ZX Spectrum

Has anybody here built the Harlequin ZX Spectrum clone? Is it a very challenging project? Is the board through-hole plated and is it pretty much a case of work slowly and carefully, put everything in the right places and you'll be OK? If I choose the 128K version, will it be backwards compatible wit...
by albertusj
Tue Aug 06, 2019 12:09 pm
Forum: Hardware
Topic: Tape Loading
Replies: 4
Views: 382

Re: Tape Loading

I did an analysis of tape data storage here:

http://www.myprius.co.za/tape_storage.htm
by albertusj
Mon Aug 05, 2019 3:06 pm
Forum: Hardware
Topic: ZX80 issue 2 kit does not start
Replies: 9
Views: 632

Re: ZX80 issue 2 kit does not start

I just built one of these:

http://www.myprius.co.za/ZX80.htm

No transistor buffer was necessary, only a back-porch generator. The kit I bought had the WRONG frequency resonator. I had to put in a 6.5536MHz crystal myself.
by albertusj
Sun Jul 28, 2019 12:45 pm
Forum: SALES
Topic: ZX Spectrum Issue 2
Replies: 3
Views: 561

Re: ZX Spectrum Issue 2

will do