Search found 77 matches
- Sun Jul 28, 2019 12:45 pm
- Forum: SALES
- Topic: ZX Spectrum Issue 2
- Replies: 3
- Views: 5197
Re: ZX Spectrum Issue 2
will do
- Sat Jul 27, 2019 11:45 am
- Forum: SALES
- Topic: ZX Spectrum Issue 2
- Replies: 3
- Views: 5197
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...
- Sun Jul 21, 2019 6:33 pm
- Forum: Hardware
- Topic: ZX80 from NTSC to PAL?
- Replies: 11
- Views: 6161
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.
- Sat Jul 20, 2019 11:15 am
- Forum: SALES
- Topic: QL Programming and how-to Books
- Replies: 0
- Views: 5303
- Thu Jul 18, 2019 11:14 am
- Forum: Hardware
- Topic: 2732 to 2532 adaptation
- Replies: 8
- Views: 4395
Re: 2732 to 2532 adaptation
Thanks 1024!
- Wed Jul 17, 2019 5:54 pm
- Forum: Hardware
- Topic: 2732 to 2532 adaptation
- Replies: 8
- Views: 4395
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...
- Wed Jul 17, 2019 7:22 am
- Forum: Hardware
- Topic: 2732 to 2532 adaptation
- Replies: 8
- Views: 4395
Re: 2732 to 2532 adaptation
I'll check the enable pin. Thanks
- Tue Jul 16, 2019 2:43 pm
- Forum: Hardware
- Topic: 2732 to 2532 adaptation
- Replies: 8
- Views: 4395
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...
- Mon Jul 15, 2019 5:01 pm
- Forum: SALES
- Topic: QL disk drive and interface for sale
- Replies: 0
- Views: 5233
- Mon Jul 15, 2019 4:57 pm
- Forum: WANTED
- Topic: Case for ZX80
- Replies: 2
- Views: 6368
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 ...