Private ~message Franck and maybe he can help you out.
PCB by Franck78..
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- Posts: 13
- Joined: Sun Jun 06, 2021 10:15 pm
Re: PCB by Franck78..
Good job! Sorry for the late reaction. Bit going on here.
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- Posts: 1
- Joined: Wed May 10, 2023 11:26 am
Re: PCB by Franck78..
Hi, is it possible to get one of those 16K internal memory expansion for the ZX81?
I love the design and I'm planning to complete the ZX81 PCB from Franck87.
Are you selling this?
If so, I'm interested in two of them.
Thank you very much!
I love the design and I'm planning to complete the ZX81 PCB from Franck87.
Are you selling this?
If so, I'm interested in two of them.
Thank you very much!
Re: PCB by Franck78..
Internal 16k RAM for ZX81 are found cheap on eBay: https://www.ebay.com/itm/195791643922
Re: PCB by Franck78..
Hello Franck,
Private messaging seems not possible.
I would like, if it;s still possible, to order 2 boards.
Kind regards,
Edzard
Private messaging seems not possible.
I would like, if it;s still possible, to order 2 boards.
Kind regards,
Edzard
- Flatulentia
- Posts: 93
- Joined: Sun May 14, 2023 3:58 pm
- Location: Cambridgeshire, UK
Re: PCB by Franck78..
That one doesn't include a RAM IC Martin.mrtinb wrote: ↑Sun Jun 04, 2023 10:55 pm Internal 16k RAM for ZX81 are found cheap on eBay: https://www.ebay.com/itm/195791643922
I'd be more inclined to just source a 28-pin DIP SRAM IC (and socket if required) and homebrew it personally. No-ones going to see the difference once it's inside the case.
http://blog.tynemouthsoftware.co.uk/201 ... rsion.html
I don't know where Ignacio is based, but I can usually source Toshiba TC55257DPL-85L 32KB SRAM ICs for between £1.40 and £3.50 new here in the UK depending on whether I'm buying in bulk or singly.
ZX81 with ZiLOG Z84 CMOS Z80, 32KB battery-backed Toshiba 55257 SRAM with charge status LED, Wilf's "Why Wait?" mod and switch-mode 5V regulator. 50/60Hz mode switch, composite video output with Zigg's back porch mod and 1080p60 HDMI output.