Search found 77 matches

by albertusj
Sun Jul 28, 2019 12:45 pm
Forum: SALES
Topic: ZX Spectrum Issue 2
Replies: 3
Views: 5175

Re: ZX Spectrum Issue 2

will do
by albertusj
Sat Jul 27, 2019 11:45 am
Forum: SALES
Topic: ZX Spectrum Issue 2
Replies: 3
Views: 5175

ZX Spectrum Issue 2

I have a ZX Spectrum issue 2 board in need of restoration/repair. It doesn't boot, but it does produce a video signal albeit a distorted one. When I put the ULA from an Issue 4 in the motherboard it showed a 1982 Sinclair Research, but the video was still distorted. I checked every chip has power. M...
by albertusj
Sun Jul 21, 2019 6:33 pm
Forum: Hardware
Topic: ZX80 from NTSC to PAL?
Replies: 11
Views: 6094

Re: ZX80 from NTSC to PAL?

It's probably not even interlaced so at 50Hz display you're only looking at ~312 lines progressive scan.
by albertusj
Sat Jul 20, 2019 11:15 am
Forum: SALES
Topic: QL Programming and how-to Books
Replies: 0
Views: 5284

QL Programming and how-to Books

I'm selling a number of QL books:

https://www.ebay.com/itm/223594232125
by albertusj
Thu Jul 18, 2019 11:14 am
Forum: Hardware
Topic: 2732 to 2532 adaptation
Replies: 8
Views: 4347

Re: 2732 to 2532 adaptation

Thanks 1024!
by albertusj
Wed Jul 17, 2019 5:54 pm
Forum: Hardware
Topic: 2732 to 2532 adaptation
Replies: 8
Views: 4347

Re: 2732 to 2532 adaptation

On the board, which enable pin is actively used, pin 18 or pin 20 on the 2732? Or are both used? Only, some ROM chips and the 2532 only have one enable pin. And yes, the A11 line needs swapping. Connect VPP to +5V. Mark PIN 18 on 2732 is actively used. So what shall I do with GVpp on the 2732? It c...
by albertusj
Wed Jul 17, 2019 7:22 am
Forum: Hardware
Topic: 2732 to 2532 adaptation
Replies: 8
Views: 4347

Re: 2732 to 2532 adaptation

I'll check the enable pin. Thanks
by albertusj
Tue Jul 16, 2019 2:43 pm
Forum: Hardware
Topic: 2732 to 2532 adaptation
Replies: 8
Views: 4347

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: 5216

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: 6334

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 ...