Search found 77 matches

by albertusj
Sat May 21, 2022 1:31 pm
Forum: Hardware
Topic: Hi-Res once and for all, PLEASE
Replies: 2
Views: 919

Re: Hi-Res once and for all, PLEASE

Thank you.
by albertusj
Sat May 21, 2022 1:00 pm
Forum: Hardware
Topic: Hi-Res once and for all, PLEASE
Replies: 2
Views: 919

Hi-Res once and for all, PLEASE

Can someone please explain to me in technical terms how the Hi-Res on a ZX81 work? I have tried modifying a homemade pack I build using a 7400 and 62256 from a design by Grant Searle to no avail. Please see my post: https://sinclairzxworld.com/viewtopic.php?f=7&t=3411&start=20 The thread had gone st...
by albertusj
Mon May 16, 2022 4:34 pm
Forum: Hardware
Topic: RAMPACK and Hi-RES mod ?
Replies: 23
Views: 12270

Re: RAMPACK and Hi-RES mod ?

To be honest I've made this mode with 1N4148 diodes and it works without any issues. Regarding NAND gates logic, the circuit would be as shown below: Hi friends, A while ago I built a ZX81 16K RAM pack using a design from Grant Searle. It works perfectly, but hi-res programs display rubbish. So I t...
by albertusj
Mon Nov 22, 2021 1:04 pm
Forum: Hardware
Topic: Zx81 ram pack
Replies: 10
Views: 3185

Re: Zx81 ram pack

My attempt. Also works on ZX81
by albertusj
Tue Dec 08, 2020 12:25 pm
Forum: SALES
Topic: ZX80 replica main board checking for interest
Replies: 5
Views: 5162

Re: ZX80 replica main board checking for interest

May I ask what the community think a fair price would be?
by albertusj
Tue Dec 08, 2020 10:14 am
Forum: SALES
Topic: ZX80 replica main board checking for interest
Replies: 5
Views: 5162

Re: ZX80 replica main board checking for interest

Yeah, on second thought you're right. Thanks.
by albertusj
Mon Dec 07, 2020 12:32 pm
Forum: SALES
Topic: ZX80 replica main board checking for interest
Replies: 5
Views: 5162

ZX80 replica main board checking for interest

I'm trying to see what the level of interest would be in my ZX80 replica board.
Image
Image
Image

I'm looking to get ~£300

Any interest?
by albertusj
Wed May 13, 2020 6:31 pm
Forum: ZX Spectrum Lounge
Topic: Photo of my TC-2048
Replies: 9
Views: 17897

Re: Photo of my TC-2048

What's the number on that big SCLD chip in the middle?
by albertusj
Wed May 13, 2020 6:27 pm
Forum: ZX Spectrum Lounge
Topic: Photo of my TC-2048
Replies: 9
Views: 17897

Re: Photo of my TC-2048

gorgeous machine!
by albertusj
Wed May 13, 2020 5:28 pm
Forum: ZX Spectrum Lounge
Topic: Timex Sinclair 2048 replica!
Replies: 3
Views: 11091

Re: Timex Sinclair 2048 replica!

:o Nice work!