Yet another ROM adapter

Discussions about Sinclair ZX80 and ZX81 Hardware
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mooredan
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Yet another ROM adapter

Post by mooredan » Sat Dec 16, 2017 3:12 am

This handles standard 27128 and 27256 pinouts, plugs into the 24pin ROM socket (don't know if it still fits in the case, but if it doesn't, I sure that soldering the adapter in place of the socket, things will fit).

First thought about a perfboard solution, but then found that PCB manufacturing is really cheap nowadays. I got 10 of these for $4.95 + $18 shipping from China:

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Loaded "Shoulders of Giants", Forth and original ROMs onto a 27256 and tested -- all is well.

Image

My plan is to run A13 over to the board and start filling up the extra 8KB with useful routines, like a device driver for a CF storage (lofty ideas).
Dan Moore
Portland, Oregon, USA

Lardo Boffin
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Joined: Sat Nov 26, 2016 2:42 am

Re: Yet another ROM adapter

Post by Lardo Boffin » Sat Dec 16, 2017 7:03 pm

Awesome. When can I buy one? :shock:
ZX81 iss 1 (bugged ROM, kludge fix, normal, kit)
Iss 3 with ZXVid, another in nearly perfect box
TS 1000 iss 3, ZXPand AY, ZX8-CCB & ZX-KDLX
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48k
Toastrack + DIVMMC future

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mooredan
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Location: Portland, Oregon, USA
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Re: Yet another ROM adapter

Post by mooredan » Sun Dec 17, 2017 12:07 am

Now. A bare board is available immediately. $4 plus shipping (which could be really cheap if you're in the U.S. -- I'll just throw it in an envelope 1st class mail).
Dan Moore
Portland, Oregon, USA

dessony
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Location: Indiana, USA

Re: Yet another ROM adapter

Post by dessony » Sun Dec 17, 2017 2:00 am

Mooredan,

from an American to an American! :)

How do I pay you for the ROM adapter? Please PM me.

Dessony.

Lardo Boffin
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Joined: Sat Nov 26, 2016 2:42 am

Re: Yet another ROM adapter

Post by Lardo Boffin » Sun Dec 17, 2017 9:16 am

mooredan wrote:
Sun Dec 17, 2017 12:07 am
Now. A bare board is available immediately. $4 plus shipping (which could be really cheap if you're in the U.S. -- I'll just throw it in an envelope 1st class mail).
Am in the UK so I suspect it will get expensive!
ZX81 iss 1 (bugged ROM, kludge fix, normal, kit)
Iss 3 with ZXVid, another in nearly perfect box
TS 1000 iss 3, ZXPand AY, ZX8-CCB & ZX-KDLX
TS 1500
TS 2000
Spectrum 16k (iss 1 s/n 1499)
Spectrum 48k
Toastrack + DIVMMC future

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1024MAK
Posts: 1913
Joined: Mon Sep 26, 2011 10:56 am
Location: Looking forward to summer in Somerset, UK...

Re: Yet another ROM adapter

Post by 1024MAK » Sun Dec 17, 2017 12:47 pm

As I'm interested as well, can I suggest that two boards be sent to one of us. Based on other bare PCBs that I have received, I estimate the cost to be less than $5 postage to the UK. Then once they are in the UK, we can mail them between ourselves.

Mark

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mooredan
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Location: Portland, Oregon, USA
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Re: Yet another ROM adapter

Post by mooredan » Sun Dec 17, 2017 9:11 pm

Dan Moore
Portland, Oregon, USA

dessony
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Joined: Tue Oct 29, 2013 2:26 pm
Location: Indiana, USA

Re: Yet another ROM adapter

Post by dessony » Mon Dec 18, 2017 10:27 pm

This adapter also will work with the TS1500! :D

Dessony

rune
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Joined: Thu Sep 04, 2014 8:35 am

Re: Yet another ROM adapter

Post by rune » Wed Dec 20, 2017 9:54 am

Id be i8nterested in two boards if they are still available.

I followed the link below but the Buy Now button just took me to my Paypal account. Could you advise of total cost inc. shipping to the UK?
Dave

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sirmorris
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Location: oxon, uk

Re: Yet another ROM adapter

Post by sirmorris » Wed Dec 20, 2017 10:06 am

Very nice. I make it 4 people interested from the UK as I'm now throwing my hat into the ring too - should we organise a group buy to save on postage?

*edit* having had a look around my usual suppliers I think the smt machined pin header might be an issue. Could you please tell us the brand/supplier or perhaps even supply the pins?
--=== ZXpand+ ... A more moderner all-in-one upgrade solution for ZX81 ===--
* SD/MMC storage * 32K Hires-capable RAM * AY sound chip * Joystick port * Serial *
* BASIC enhancements - plug & play * Reset button * Auto-boot facility *

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