Search found 1724 matches

by Ast A. Moore
Tue Sep 22, 2020 3:20 pm
Forum: Preservation
Topic: Starchess
Replies: 5
Views: 294

Re: Starchess

I don’t think starches are good for you. :D
by Ast A. Moore
Sun Sep 20, 2020 11:23 pm
Forum: Programming
Topic: Making a double-sided TZX
Replies: 3
Views: 146

Re: Making a double-sided TZX

Give ZX-Blockeditor a try.
by Ast A. Moore
Sun Sep 20, 2020 10:14 pm
Forum: Hardware
Topic: components prone to fail
Replies: 2
Views: 98

Re: components prone to fail

The ULA is pretty much the only IC that you’ll need to worry about. If it’s a later board revision (Issue 5 and 6), then another custom IC is the ZX8401. The LM1889 and the lower RAM ICs are difficult—but not impossible—to come by nowadays, even though they used to be off-the-shelf parts. I suggest ...
by Ast A. Moore
Sun Sep 20, 2020 10:07 pm
Forum: Programming
Topic: More Multicolour - Trailblazer Roadway
Replies: 12
Views: 434

Re: More Multicolour - Trailblazer Roadway

Could the effect be extended into the border ? The areas seem large enough for that. Since you can’t use the inverted INK/PAPER trick in the border area, the minimum step for a color change in the border area is eight “pixels” (four T states). That, and the inability of the ULA to render bright col...
by Ast A. Moore
Sat Sep 19, 2020 10:29 pm
Forum: Announcements
Topic: Introduce yourself!
Replies: 440
Views: 90216

Re: Introduce yourself!

Hi @RetroEnzo,
And welcome to SC!
by Ast A. Moore
Sat Sep 19, 2020 8:17 pm
Forum: Programming
Topic: More Multicolour - Trailblazer Roadway
Replies: 12
Views: 434

Re: More Multicolour - Trailblazer Roadway

Dang, that’s mighty impressive!
by Ast A. Moore
Fri Sep 18, 2020 1:17 pm
Forum: Hardware
Topic: Grey +2 RGB SCART help wanted
Replies: 9
Views: 220

Re: Grey +2 RGB SCART help wanted

there is a 20" Sony Bravia local to me on gumtree for £25. If the seller agrees I could bring the +2 round, hook it up and if it works all good. That’s certainly an option. It’s ultimately your choice, but if you’re thinking of purchasing a dedicated TV set for you Speccys, may I suggest you get a ...
by Ast A. Moore
Fri Sep 18, 2020 11:17 am
Forum: Hardware
Topic: Issue 2 TR4 keeps blowing and DRAM is tested OK
Replies: 13
Views: 345

Re: Issue 2 TR4 keeps blowing and DRAM is tested OK

The ULA is supplied only by the +5V (from the 7805 voltage regulator), so it is definitely not the cause of your problems. It is designed to run hot. Internally the logic runs on a 0.85V to 0.95V supply so there are on-chip series voltage regulators to drop the supply voltage (pin 13 which should b...
by Ast A. Moore
Thu Sep 17, 2020 11:20 pm
Forum: Sinclair Miscellaneous
Topic: TZX format specification
Replies: 5
Views: 233

Re: TZX format specification

The only other link I've found so far is this one , but I don't know who runs that site. That would be Günter Woigk, the author of zasm and zxsp . A brilliant guy. The TZX spec page is a copy of the one Ralf linked to (oh, and MrClump, too). I’ve never seen another version, so I’ve always taken it ...
by Ast A. Moore
Thu Sep 17, 2020 11:10 pm
Forum: Hardware
Topic: Grey +2 RGB SCART help wanted
Replies: 9
Views: 220

Re: Grey +2 RGB SCART help wanted

I heard some +2s have incorrectly placed transistors. Which transistors are affected? And what problems would it cause? It’s the three 2N3904s: TR4, TR5, and TR7. TR7 and TR5, even if mounted incorrectly, will generally cause no trouble with the video signal. TR4 is part of the circuitry that forms...