Search found 70 matches

by albertusj
Tue Jul 16, 2019 2:43 pm
Forum: Hardware
Topic: 2732 to 2532 adaptation
Replies: 8
Views: 1315

2732 to 2532 adaptation

Hi, I have a ZX80 built from a kit that currently uses a 2732 for the ROM. I'd like to test a 2532 I have on the board, but I'm not entirely clear on which pins need to be adapted. http://searle.hostei.com/grant/zx80/ROMPinouts.gif From Grant Searle's excellent site Am I correct in stating that in o...
by albertusj
Mon Jul 15, 2019 5:01 pm
Forum: SALES
Topic: QL disk drive and interface for sale
Replies: 0
Views: 3274

QL disk drive and interface for sale

I'm selling a QL disk drive and interface here:

https://www.ebay.com/itm/223585897180
by albertusj
Mon Jul 15, 2019 4:57 pm
Forum: WANTED
Topic: Case for ZX80
Replies: 2
Views: 3520

Case for ZX80

Hi, I built a ZX80 from a kit but would like to put it in a case. Does anybody know of someone who sells reproduction or NOS cases? Have a look at my new ZX80 here: http://www.myprius.co.za/ZX80kit/100_6216.JPG In the photo above you'll see the RAM pack I built from Grant Searle's website. The back ...
by albertusj
Mon Jul 15, 2019 4:54 pm
Forum: Hardware
Topic: EPROM models for 8K ZX80 ROM
Replies: 2
Views: 670

Re: EPROM models for 8K ZX80 ROM

Mutant Caterpillar is going to do some for me.
by albertusj
Mon Jul 15, 2019 1:00 pm
Forum: Hardware
Topic: Jailbars on ZX80
Replies: 4
Views: 825

Re: Jailbars on ZX80

Thanks as always 1024! I'll try your suggestions.
by albertusj
Sun Jul 14, 2019 1:07 pm
Forum: Hardware
Topic: EPROM models for 8K ZX80 ROM
Replies: 2
Views: 670

EPROM models for 8K ZX80 ROM

Possible dumb question,

I'd like to have an 8K BASIC ROM burned for my ZX80. What model EPROM should I ask for? 2364 or pin-compatible modern replacement?
by albertusj
Sun Jul 14, 2019 12:41 pm
Forum: WANTED
Topic: 8K BASIC ROM for ZX80
Replies: 6
Views: 3525

Re: 8K BASIC ROM for ZX80

Lardo Boffin wrote:
Tue Jul 09, 2019 8:02 pm
Mutant Caterpillar Games may be able to help.

http://www.mutant-caterpillar.co.uk/
Thanks
by albertusj
Sun Jul 14, 2019 12:40 pm
Forum: Hardware
Topic: Jailbars on ZX80
Replies: 4
Views: 825

Re: Jailbars on ZX80

Strategically placed 100nF capacitors over the power rails of U9 and U20 made for some improvement. :D
by albertusj
Sat Jul 13, 2019 7:27 pm
Forum: Hardware
Topic: Identifying Board Version
Replies: 3
Views: 1465

Re: Identifying Board Version

Thank you
by albertusj
Sat Jul 13, 2019 7:22 pm
Forum: Hardware
Topic: Jailbars on ZX80
Replies: 4
Views: 825

Jailbars on ZX80

Does anyone have any suggestions on how I can eliminate or reduce the "jail bar" effect present on my ZX80s composite output?

http://www.myprius.co.za/jailbar.JPG