Yet another ROM adapter
Yet another ROM adapter
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:
Loaded "Shoulders of Giants", Forth and original ROMs onto a 27256 and tested -- all is well.
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).
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:
Loaded "Shoulders of Giants", Forth and original ROMs onto a 27256 and tested -- all is well.
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
Portland, Oregon, USA
-
- Posts: 2173
- Joined: Sat Nov 26, 2016 2:42 am
Re: Yet another ROM adapter
Awesome. When can I buy one?
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
Re: Yet another ROM adapter
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
Portland, Oregon, USA
Re: Yet another ROM adapter
Mooredan,
from an American to an American!
How do I pay you for the ROM adapter? Please PM me.
Dessony.
from an American to an American!
How do I pay you for the ROM adapter? Please PM me.
Dessony.
-
- Posts: 2173
- Joined: Sat Nov 26, 2016 2:42 am
Re: Yet another ROM adapter
Am in the UK so I suspect it will get expensive!
ZX80
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt)
TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART
Tatung 81 + Wespi
TS 1500 & 2000
Spectrum 16k (iss 1 s/n 862)
Spectrum 48ks plus a DIVMMC future and SPECTRA
- 1024MAK
- Posts: 5118
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: Yet another ROM adapter
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
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
Re: Yet another ROM adapter
Dan Moore
Portland, Oregon, USA
Portland, Oregon, USA
Re: Yet another ROM adapter
This adapter also will work with the TS1500!
Dessony
Dessony
Re: Yet another ROM adapter
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?
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
Re: Yet another ROM adapter
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?
*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?