General Chit Chat about Sinclair Computers and their Clones
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Andy Rea
- Posts: 1546
- Joined: Fri May 09, 2008 2:48 pm
- Location: notts UK
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by Andy Rea » Fri Feb 22, 2019 12:06 am
so the zx81 core board, takes a ULA and makes the RC2014 zx81 compatible ?
any one got one? and got one of my zx81 ULA replacement modules ?
does it work ?
regards 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
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dessony
- Posts: 256
- Joined: Tue Oct 29, 2013 2:26 pm
- Location: Indiana, USA
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by dessony » Fri Feb 22, 2019 12:41 am
Andy,
I bought a ZX81 ULA replacement module from you.
Everyone else,
Also, I have the ULAs bearing 184 and 210. I ordered a ZX81 core board for the RC2014 Z80 platform last week. I expected that the board will arrive my mailbox next week or so. I might have to order a few BC547 and BC548 transistors and other electronic parts.
Cheers,
DesSony
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1024MAK
- Posts: 2571
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
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by 1024MAK » Fri Feb 22, 2019 6:08 pm
Andy Rea wrote: ↑Fri Feb 22, 2019 12:06 am
so the zx81 core board, takes a ULA and makes the RC2014 zx81 compatible ?
any one got one? and got one of my zx81 ULA replacement modules ?
does it work ?
regards Andy
I believe you also have to “adjust” your RC2014 system to provide the bus “isolating” resistors and to adjust the ROM and RAM controls.
Mark
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dessony
- Posts: 256
- Joined: Tue Oct 29, 2013 2:26 pm
- Location: Indiana, USA
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by dessony » Sun Feb 24, 2019 7:44 am
https://groups.google.com/forum/#!msg/r ... c8g_ugiseo
David Roper and Spencer Owen designed their own ZX81 Core Boards separately! Mr. Roper seems finished his own board and is ready to sell. Mr. Owen somewhat suspended his own board project. However, these two nice gentlemen are located in England(U.K.).
Cheers,
DesSony
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dessony
- Posts: 256
- Joined: Tue Oct 29, 2013 2:26 pm
- Location: Indiana, USA
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by dessony » Fri Mar 08, 2019 8:35 am
Front of the board
Back of the board
D. Roper made this ZX81 board to be applied on the RC2014 back panel.
Cheers,
DesSony
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dessony
- Posts: 256
- Joined: Tue Oct 29, 2013 2:26 pm
- Location: Indiana, USA
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by dessony » Fri Mar 08, 2019 8:40 am
Front of the board
Back of the board
Spencer Owen designed this Enhanced Z80 board.
Cheers,
DesSony