Search found 12 matches

by VinCBR900
Mon Feb 04, 2019 6:37 am
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 59
Views: 6571

Re: Jupiter ACE (again)

Are there any other roms for the ACE? This may be Sacrilege, but for example, BASIC?
by VinCBR900
Tue Nov 22, 2011 6:16 pm
Forum: Software
Topic: Free online Z80 or ZX81 books
Replies: 13
Views: 6636

Re: Free online Z80 or ZX81 books

Toni is a lady...
by VinCBR900
Fri Sep 16, 2011 3:45 pm
Forum: Development
Topic: Hi-speed loadings for zx81
Replies: 52
Views: 46069

Re: Hi-speed loadings for zx81

by VinCBR900
Sat Aug 20, 2011 8:19 pm
Forum: Development
Topic: Interlace?
Replies: 2
Views: 4030

Re: Interlace?

I would have been surprised if no one else had tried this in 30 years.

Bodo's page is very interesting with gray scale, 320 by 256 pixel display and also his CPLD ULA replacements.
by VinCBR900
Sat Aug 20, 2011 12:44 pm
Forum: Development
Topic: Interlace?
Replies: 2
Views: 4030

Interlace?

I tried a Google search and kept coming up with Speccy links, but has anyone managed an interlace Hi Res graphics mode on the zeddy? I thought about Two H files in lower 32k ram , switching I register on alternate video frames during vblank with 1/2 video scan line delay on secodn h file to offset? ...
by VinCBR900
Sun Aug 07, 2011 6:11 pm
Forum: Sinclair Misc
Topic: Rainy sunday afternoon topic: Why Z80?
Replies: 2
Views: 1501

Rainy sunday afternoon topic: Why Z80?

Hi All, Why did the Sinclair team use the Z80? The Mk14 used a Scamp, but that had a limited memory model. If the team were motiviated by low cost, then the 6502 was a smaller die and cost less than any competitors when it first came out. The Sinclair design did not need CP/M compatibility so didnt ...
by VinCBR900
Wed Aug 03, 2011 11:06 am
Forum: Hardware
Topic: Simple 8-16K RAM Mod Question
Replies: 15
Views: 4221

Re: Simple 8-16K RAM Mod Question

There is a related thread that might be worth reviewing http://www.sinclairzxworld.com/viewtopic.php?t=66 Personally, if you are using a DIL chip (rather than individual tiny little logic SOT23) then it doesn matter which 14/16pin DIL, so I would prefer to build something with a bit more flexibility...
by VinCBR900
Tue Aug 02, 2011 2:03 pm
Forum: Development
Topic: ULA revistited.
Replies: 168
Views: 85126

Re: ULA revistited.

Andy, If you used the original modulator then a pair of 75-300 ohm dc blocking TV matching transformers wired back to back could provide galvanic isolation from the hot mains TV chassis. I dont think this woudl work with composite as the sync would be lost and need re-introducing, so a modification ...
by VinCBR900
Mon Aug 01, 2011 12:18 pm
Forum: Sinclair Misc
Topic: No pcb serial Numbers, so any Lists of provenance?
Replies: 5
Views: 2362

Re: No pcb serial Numbers, so any Lists of provenance?

Hi Moggy, thanks for the diatribe ;) I think I know about the particular guitar amp you refer to with military connections. FYI, Blackstar Amps are a northamptom based company who seem to be doing very well. However, most of these guys do whats needed to keep small companies up and running, like gat...