Search found 58 matches

by superfo
Mon Jul 23, 2018 9:34 am
Forum: SALES
Topic: ZX81 ULA
Replies: 65
Views: 5250

Re: ZX81 ULA

I miss it again :(
by superfo
Fri Mar 30, 2018 10:06 am
Forum: Hardware
Topic: WANTED SPECTRUM NTSC ULA
Replies: 9
Views: 756

Re: WANTED SPECTRUM NTSC ULA

I have a Harlequin 128 issue 2E that can switch between PAL and NTSC by jumper. Also it can switch between 48k and 128k timing.
If anyone want to try let me know.
by superfo
Sat Mar 10, 2018 9:20 pm
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 198
Views: 23322

Re: ZX81 ULA-in-a-CPLD

Nice work for both, congratulation !

Now I have to dig out my board and continue working on it :)

viewtopic.php?f=6&t=445&p=3796&hilit=superfo#p3796
by superfo
Fri Feb 16, 2018 7:53 am
Forum: SALES
Topic: ZX Max 48 issue 2 PCB
Replies: 4
Views: 698

Re: ZX Max 48 issue 2 PCB

I upload files and how to convert ZX Max 48 issue2 to be ZX 128K

Image

Image
by superfo
Fri Feb 16, 2018 12:50 am
Forum: SALES
Topic: ZX Max 48 issue 2 PCB
Replies: 4
Views: 698

Re: ZX Max 48 issue 2 PCB

Beautiful! I especially like the resistors hidden inside the footprint of the DIL socket. As I have another CPLD spare (unsure of its working status though) I think I should go for an issue 2 also. Is anyone else in the UK thinking of getting one? Would you be happy to combine shipping for a couple...
by superfo
Wed Feb 14, 2018 9:02 am
Forum: SALES
Topic: ZX Max 48 issue 2 PCB
Replies: 4
Views: 698

ZX Max 48 issue 2 PCB

You can buy ZX Max 48 issue2 PCB from here (add AY sound and Kempston Joystick port) https://www.sellmyretro.com/offer/details/25865 Download document and CPLD file from here https://onedrive.live.com/?id=E0ADBB58ADB8D869%21141&cid=E0ADBB58ADB8D869 Sorry for high shiping cost to outside USA, this is...
by superfo
Mon Dec 04, 2017 12:39 am
Forum: SALES
Topic: ZX Max 48 PCB
Replies: 14
Views: 1824

Re: ZX Max 48 PCB

Andy Rea wrote:
Sun Dec 03, 2017 10:25 pm
i have ordered PCB and will sometime buy parts, i have programming stuff for altera already :-) i'm not really a spectrum guy but this looks like a fun project and a good use for one of my empty zx81 cases :mrgreen:

regards Andy
Thank you !
by superfo
Sun Dec 03, 2017 5:45 pm
Forum: SALES
Topic: ZX Max 48 PCB
Replies: 14
Views: 1824

Re: ZX Max 48 PCB

As in the last time I got about 50% fake chips from China I am more careful now what I buy. I prefer reliable sources. It's depending on the chip type. The DS1302 I bought last time were not working or even crashing my system (different suppliers show different behavior). I agree, there are many se...
by superfo
Sun Dec 03, 2017 1:21 am
Forum: SALES
Topic: ZX Max 48 PCB
Replies: 14
Views: 1824

Re: ZX Max 48 PCB

The CPLD (EPM7128SLC84) is hard to find in Europe for a reasonable price. I think that's why I never used it. Can get one for around 30 EUR but EOL product as well. Yes, it is EOL product but still can find it from EBAY at $2-$3 (almost sellers are from CHINA) https://www.ebay.com/sch/i.html?_odkw=...
by superfo
Sat Dec 02, 2017 7:57 am
Forum: SALES
Topic: ZX Max 48 PCB
Replies: 14
Views: 1824

Re: ZX Max 48 PCB

Paul wrote:
Fri Dec 01, 2017 10:37 am
Just purchased one.
:mrgreen:
Thank you!