Search found 280 matches

by McKlaud
Tue Feb 13, 2018 10:12 pm
Forum: Hardware
Topic: Internal RAM upgrade
Replies: 10
Views: 4671

Re: Internal RAM upgrade

In my mind you can use 1N4148 silicon diodes instead of germanium units like 1N34A. 1N34A can be also replaced them with Schottky type like BAT85 in this application.
by McKlaud
Tue Feb 06, 2018 7:51 pm
Forum: Hardware
Topic: Improving Timex/Sinclair Tape Loading
Replies: 153
Views: 48135

Re: Improving Timex/Sinclair Tape Loading

:D
by McKlaud
Sat Feb 03, 2018 5:59 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 21090

Re: zx spectrum in zx81 case

@gozzo: send me a PM.

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128K edition nearly finished
by McKlaud
Wed Jan 31, 2018 6:33 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 21090

Re: zx spectrum in zx81 case

The keyboard overlay with the ZX Spectrum layout was designed and made by Dave of Tynemouth Software.
by McKlaud
Tue Jan 23, 2018 9:48 pm
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 233
Views: 65696

Re: ZX81 ULA-in-a-CPLD

Unfortunately all pictures stored on PhotoBucket gone and no chance to see what was on them. :( Anyway, one of my ZX81s is dead and I decided to recreate the RetroTechie's implementation using XC9572XL. The prototype PCB on a breadboard under 13MHz generator test is in full flesh on the attached pho...
by McKlaud
Mon Jan 22, 2018 10:56 pm
Forum: Hardware
Topic: 2KB memory in a 1KB ZX81
Replies: 2
Views: 1277

Re: 2KB memory in a 1KB ZX81

NEC D4016D is 2KB (2048words x 8bits) Static RAM chip. You will not risk anything if you remove LK1 and put the LK2 in. 2KB was a standard in any TS1000. I would not be surprised if your board is one of Issue 3 boards but Sinclair was short with supplies to UK market and they used anything what they...
by McKlaud
Sun Jan 21, 2018 12:16 pm
Forum: Development
Topic: Help Wanted
Replies: 12
Views: 3171

Re: Help Wanted

Elecrow less than $10 for 5 units with delivery. The delivery time up to 14 days.
by McKlaud
Sat Jan 20, 2018 9:32 pm
Forum: Development
Topic: Help Wanted
Replies: 12
Views: 3171

Re: Help Wanted

Charles

See these
Image

I sure you will be able fit to the bottom one inside the Zeddy/Speccy.
by McKlaud
Sat Jan 20, 2018 9:04 pm
Forum: Development
Topic: Help Wanted
Replies: 12
Views: 3171

Re: Help Wanted

Ask Google for "ZX Spectrum BreadBoard" or "ZX Spectrum Extender" or "ZX-BUS expander".
by McKlaud
Fri Jan 19, 2018 10:09 pm
Forum: Development
Topic: Dodge development thread
Replies: 1
Views: 1016

Re: Dodge development thread

Good luck! :)