MEMOTECH

General Chit Chat about Sinclair Computers and their Clones
User avatar
Andy Rea
Posts: 1264
Joined: Fri May 09, 2008 1:48 pm
Location: notts UK

Re: MEMOTECH

Post by Andy Rea » Sun Oct 15, 2017 5:29 pm

Well i should have thought the external keyboard would be a number 1, the interface it's self is not difficult, but getting a custom keyboard fabricated could be somewhat costly


Andy
6 x ZX81, 1 x TS1500 , 1 x +3e, 1 x timex 2040 printer, 1 x timex 2020 cassette deck, siclair printer and some spectrum

User avatar
Paul
Posts: 860
Joined: Thu May 27, 2010 7:15 am
Location: Germanys west end

Re: MEMOTECH

Post by Paul » Sun Oct 15, 2017 6:00 pm

Yes, I forgot about this (not usable on ZX80) ;)
A PS/2 keyboard interface is available next year. That is much better than any matrix keyboard that needs to be produced.
In theory, there is no difference between theory and practice. But, in practice, there is.

User avatar
mrtinb
Posts: 504
Joined: Fri Nov 06, 2015 4:44 pm
Location: Denmark
Contact:

Re: MEMOTECH

Post by mrtinb » Sun Oct 15, 2017 6:16 pm

The problem with using a "regular" keyboard with an interface is that the text and graphics on the keys are missing. This makes the keyboard be like an emulator or the like.

That's why I made my own keyboard. I used Wilf Rigther's schematics for an external interface.
Martin
ZX81, Lambda 8300, Commodore 64, Mac G4 Cube

User avatar
Paul
Posts: 860
Joined: Thu May 27, 2010 7:15 am
Location: Germanys west end

Re: MEMOTECH

Post by Paul » Sun Oct 15, 2017 6:58 pm

There is nothing compared to a cherry keyboard.
Keyword stickers aren't difficult to make.
The ZX-TEAM is creating lot of pcbs in half euro pcb format (80x100mm) for a backplane zeddy.
Don't ask me why. Somehow this became a habit during the last year.
Backplane, Serial, parallel, Zeddynet, zxblast, zonX (with speaker} are ready, video output and keyboard coming soon. Backplane to be plugged into bare zx81 or zxnu, ZX core or ZX more.
In theory, there is no difference between theory and practice. But, in practice, there is.

RWAP
Site Admin
Posts: 1230
Joined: Thu May 08, 2008 7:42 am
Location: Stoke-on-Trent, UK
Contact:

Re: MEMOTECH

Post by RWAP » Sun Oct 15, 2017 7:52 pm

Yes, a keyboard interface is one of the most popular wishes.

A centronics interface is also a potential thanks to the Retro-Printer - however, it would probably make more sense here to develop a simple centronics interface which would work with the ZX81 and ZX Spectrum and just emulate the ZX Printer to send the signals to a centronics connector (and hence the Retro-Printer). The Retro-Printer would then need a new filter to convert that data to a PDF for printing.

User avatar
gammaray
Posts: 250
Joined: Sun Apr 17, 2016 1:44 am
Location: Texas

Re: MEMOTECH

Post by gammaray » Sun Oct 15, 2017 9:23 pm

Paul wrote:
Sun Oct 15, 2017 5:14 pm
In order to give the thread a different direction :
Memotech expansions were great when they were first offered but nowadays make little sense to recreate.
Rampack with dynamic ram should better be static ram today. And with ZXPand and zxblast these are available.
Hrg module are not necessary any more and there is very little software supporting the Memotech Hrg.
Memotech serial port was very bad in quality and serial ports are available via the ZX-TEAM.
Centonics interfaces were very good but printers with Centonics interface are rarely available anymore. Something new should be developed here.
All the software modules were really very difficult to use.
So what would you like to reconstruct?
I should have been asking does it make sense to reproduce these peripherals. But if you want to nostalgia, it would hard won in recreating some of these if originals could be found and design plans shared.
Finish what you start. Truth is over the mountaintop or six feet under.
4 x TS1000, 2 x TS1500 , 2 x timex 2040 printer, 1/2 x timex 2020 cassette deck, ZXPAND, ZeddyNET, ZXBlast..., unfinished Spectrum...

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest