Search found 12 matches

by balford
Thu Dec 14, 2017 10:43 pm
Forum: Hardware
Topic: zx-diagnostics v0.36 - beta testers wanted!
Replies: 5
Views: 95

Re: zx-diagnostics v0.36 - beta testers wanted!

Go for it guys, firmware link is in the initial post, and there are instructions on the wiki (link in my sig).
by balford
Wed Dec 13, 2017 8:47 pm
Forum: Hardware
Topic: zx-diagnostics v0.36 - beta testers wanted!
Replies: 5
Views: 95

Re: zx-diagnostics v0.36 - beta testers wanted!

Well if the ROM's missing, it'll confirm that fact for you :D

Thanks Mark :)
by balford
Tue Dec 12, 2017 9:16 pm
Forum: Hardware
Topic: zx-diagnostics v0.36 - beta testers wanted!
Replies: 5
Views: 95

zx-diagnostics v0.36 - beta testers wanted!

Hi everyone, I'm in the final stages of preparing a new zx-diagnostics release, so I'm looking for beta testers :) You'll need to have a Diagnostic board, Retroleum SMART card, ZXC3/ZXC4 cartridge, Dandanator! Mini or a good old fashioned EPROM blower. Oh, and preferably one or more broken machines ...
by balford
Sun Nov 26, 2017 12:07 am
Forum: Hardware
Topic: 48K Issue 6A
Replies: 7
Views: 244

Re: 48K Issue 6A

One of the first things the ROM code does, regardless of memory state, is set the border to white. So if that's not happening then either the CPU is dead, or more likely in your case, one or more faulty RAM chips are holding data lines high or low. Since we have the data bus separator resistors prot...
by balford
Mon Nov 20, 2017 1:06 am
Forum: Hardware
Topic: 48K Issue 6A
Replies: 7
Views: 244

Re: 48K Issue 6A

Lucky I had them saved locally then :) Here you go:
http://www.brendanalford.com/PCF1306P.zip
by balford
Mon Nov 20, 2017 12:34 am
Forum: Hardware
Topic: 48K Issue 6A
Replies: 7
Views: 244

Re: 48K Issue 6A

Here's a link to a page describing ZX-MUX, which was designed to be a drop in replacement for the ZX8401/PCF1306/Amstrad 40058 IC's:
http://8bit.yarek.pl/upgrade/zx.zxmux/index-de.html

You'll find schematics and gerber files there, I've built a few using the gerbers and they work fine.
by balford
Fri Nov 17, 2017 9:47 am
Forum: Games/Software
Topic: I can't believe they attempted that.
Replies: 6
Views: 235

Re: I can't believe they attempted that.

I absolutely loved Behind Closed Doors. Hadn't done any major adventuring before finding this on a SU cover tape.
by balford
Thu Nov 16, 2017 12:25 pm
Forum: Graphics
Topic: Spectrum screen layout
Replies: 6
Views: 245

Re: Spectrum screen layout

For an explanation of the memory screen layout, see this page (by Chris Smith, this is the work that fed into his book): http://www.zxdesign.info/memoryToScreen.shtml - and for an explanation (a little technical) as to why this layout is important: http://www.zxdesign.info/dynamicRam2.shtml Basicall...
by balford
Thu Nov 16, 2017 9:45 am
Forum: Hardware
Topic: +3 was too expensive?
Replies: 11
Views: 266

Re: +3 was too expensive?

Think the +3 was £249 when first released, which sailed a bit too close to A500 territory in my view.

£199 would have been a nice initial price point, I agree.
by balford
Thu Nov 16, 2017 9:43 am
Forum: Miscellaneous
Topic: World of Spectrum....
Replies: 60
Views: 2062

Re: World of Spectrum....

A phrase I use a lot is 'we are where we are'. Everyone has their own viewpoint on how we got here, the important bit is how we continue.