Memopak Centronics Interface, plus another.

ZX80 / ZX81 hardware and software offered for sale or swapping
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XavSnap
Posts: 1940
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Location: 'Zx81 France' Fb group.

Re: Memopak Centronics Interface, plus another.

Post by XavSnap »

Many Thanks Erm,
:shock:

It's a fast Dump !
:lol:

About 108 bytes changed:
Capture_ifrom4.JPG

Dump in the A$ variable:
Rom_IF.p
(4.97 KiB) Downloaded 236 times
Bios binary:
Bios_IFC.zip
(6.76 KiB) Downloaded 228 times
Xavier ...on the Facebook groupe : "Zx81 France"(fr)
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XavSnap
Posts: 1940
Joined: Sat May 10, 2008 4:23 pm
Location: 'Zx81 France' Fb group.

Re: Memopak Centronics Interface, plus another.

Post by XavSnap »

Hi,
The Memotech is now complet.
Capture_ifrom5.JPG
The last Rom, without the BIOS memory segment : http://www.zx81stuff.org.uk/zx81/hardware/MemopakIF

The new ROM:
MemotechCIF.zip
(602 Bytes) Downloaded 248 times
:ugeek:

I'm working to had this hardware to Vb81.
Xavier ...on the Facebook groupe : "Zx81 France"(fr)
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XavSnap
Posts: 1940
Joined: Sat May 10, 2008 4:23 pm
Location: 'Zx81 France' Fb group.

Re: Memopak Centronics Interface, plus another.

Post by XavSnap »

Thanks to all contributors.
Xavier ...on the Facebook groupe : "Zx81 France"(fr)
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Erm
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Re: Memopak Centronics Interface, plus another.

Post by Erm »

XavSnap wrote: Tue Sep 22, 2020 7:06 pm Thanks to all contributors.
Pretty sure it was just me! ;)

If anyone finds this thread, the Memotek I/F Centronics device and the other related add-on are still for sale.
I'm Chris, a Brit in Germany (Chr$ on the QL forum). https:\\QXL.WIN < QL related collection.
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Erm
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Re: Memopak Centronics Interface, plus another £70.

Post by Erm »

Erm wrote: Sun Sep 20, 2020 9:53 pm Hello.

For sale here is a Memotek I/F Centronics Type Parallel Printer Interface plus what looks to be a home/kit made Centronics Interface of some kind.

The Memotek device: is in excellent condition, gorgeous satin black metal with hardly a mark on it. The PCB inside also looks great. I don't have the cable that goes with it, nor do I have a Centronics printer so to test it I plugged it in to a bog standard ZX81 and it booted as normal. I was then able to Peek the addresses of the Memotek ROM (2800h to 2A00h) and those addresses certainly read differently compared to when the interface is not attached (e.g.10240 is 32 with it plugged in and 24 without it). So it's certainly 'there'.

The other device: appears to be home-made, but perhaps from some kind of kit as the PCB has 'Centronics' written on it and was certainly designed for a ZX81. The ZX81 expansion plug appears to have been sourced from a ZX Printer. It has 3x 74X chips on on the other end is a Centronics type connector. The ribbon to this connector has 3 wires that were either never connected or have become unattached - I think I can make out where 2 of them were once soldered and the 3rd is a mystery.

£70 plus postage (for both devices).
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I'm Chris, a Brit in Germany (Chr$ on the QL forum). https:\\QXL.WIN < QL related collection.
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