Search found 1014 matches

by Lardo Boffin
Sat Sep 21, 2019 1:01 pm
Forum: Software
Topic: Daft question about ZX81 software on the ZX80
Replies: 5
Views: 268

Re: Daft question about ZX81 software on the ZX80

Just to be going on with Lardo full fide 1k chess for the ZX80 takes approx 30 secs to load so not having to wait half a day to see if it works and slightly more interesting than yet another mastermind clone. :lol: I have a O file to wav jobby I can dig out and post. Cursor controls are Q-A (up dow...
by Lardo Boffin
Thu Sep 19, 2019 4:13 pm
Forum: SALES
Topic: Lardo buys another zeddy
Replies: 13
Views: 483

Re: Lardo buys another zeddy

For U.K. subjects only: oh, look at how many U.S. dollars there were to Sterling back then... :( Back to the subject, have you peeked ( :lol: ) inside :?: If yes, does it use 4116 (or equivalent) DRAM chips? And can you post photos :mrgreen: Note I suspect there are four screws and two are hidden u...
by Lardo Boffin
Thu Sep 19, 2019 11:20 am
Forum: SALES
Topic: Lardo buys another zeddy
Replies: 13
Views: 483

Re: Lardo buys another zeddy

Hi Lardo, D726EF46-3B4E-4B0B-AD5A-7F76DA688614[1].jpg "JRS" ? What's daaaat? I had never heard of them before either. It is a 16K RAM pack (http://www.zx81stuff.org.uk/zx81/hardware/JRS16K and http://www.zx81stuff.org.uk/zx81/hardware/JRS16K/mag/SinclairUser/Issue008/Pages/SinclairUser00800054.jpg)...
by Lardo Boffin
Thu Sep 19, 2019 10:00 am
Forum: SALES
Topic: Lardo buys another zeddy
Replies: 13
Views: 483

Re: Lardo buys another zeddy

Two arrived yesterday, both working.
5D53B517-BA3D-4CBE-8130-E2AEFDBDEC35.jpeg

A green PCB issue 3 - I have not had one of those before:
22B911B7-A872-4AB7-BBA5-22CD496838F8.jpeg
by Lardo Boffin
Wed Sep 18, 2019 8:55 pm
Forum: SALES
Topic: Yet Another bugged ROM early zeddy for sale
Replies: 11
Views: 532

Re: Yet Another bugged ROM early zeddy for sale

This has now gone.
by Lardo Boffin
Tue Sep 17, 2019 9:13 am
Forum: Hardware
Topic: Repairing lower RAM - which approach?
Replies: 6
Views: 169

Re: Repairing lower RAM - which approach?

Here is one option:

https://www.retroleum.co.uk/spectrum-repairs-mods


I have managed to find dodgy lower RAM by piggybacking a working chip on top of the each one in turn until it works. I literally just pushed the good chip on top of the soldered in chips.
by Lardo Boffin
Mon Sep 16, 2019 9:32 pm
Forum: Software
Topic: Daft question about ZX81 software on the ZX80
Replies: 5
Views: 268

Re: Daft question about ZX81 software on the ZX80

Thanks all! I had hoped to look at this tonight but sadly overtime beckons...
by Lardo Boffin
Mon Sep 16, 2019 3:54 pm
Forum: Software
Topic: Daft question about ZX81 software on the ZX80
Replies: 5
Views: 268

Daft question about ZX81 software on the ZX80

Hello all Daft question alert! Are there any ZX81 programs that are likely to run on the ZX80 - with a ZX80 ROM present (not an ‘upgraded’ ZX80 with an 81 ROM)? I am working on the assumption that some very simple BASIC programs may work? Or were things really changed for the 81? The long and short ...
by Lardo Boffin
Sat Sep 14, 2019 6:58 pm
Forum: Sinclair Misc
Topic: Looking for a book
Replies: 7
Views: 258

Re: Looking for a book

Also

15D671CD-412B-4E07-B63A-ECB8A8DC2EF7.jpeg
6198E14C-614F-4064-AAD9-E037D877AF0F.jpeg
by Lardo Boffin
Sat Sep 14, 2019 6:29 pm
Forum: Sinclair Misc
Topic: Looking for a book
Replies: 7
Views: 258

Re: Looking for a book

I have this:-

FB589973-8DB1-42F4-BBFC-46757CF35806.jpeg
F9D95AA3-C01B-4730-9EAD-8933ABE469AC.jpeg
46245FB2-527C-4575-A161-005B5E3FB3F6.jpeg