Hello Dan,
That's a nice buy! Is it a real ZX81 or a TS1000? I would advice you to put a heatsink on the ULA and replace the 7805 with a switched mode regulator. Especially if you want to run it 24/7 as a nixie clock as the ULA's get uncomfortably hot (a known problem of the ZX81/TS1000). The heatsink and SMPS will for sure extend the life span. If you have a TS1000, it is very simple to replace the 7805 and re-use its original heatsink for the ULA. I glued it to the ULA with some silver epoxy.
I don't have a complete kit but I can sell you the PCB. I got some extra tubes and K155ID1 drivers so you can either buy the PCB only or with the tubes & drivers. I got to see how much I actually paid for these items but I guess the board was around $25 and the tubes + driver about $6. So the whole set would be around $55 including 1 spare tube & driver ex postage. There are a few mods that need to be made to the board as I had put the tubes up-side-down (.....). This is a relatively easy mod though as most is done in the software, so it ended up only having to re-route 2 pins of the IN12 tubes.
If you have troubles connecting your ZX81 to an LCD TV, I got a simple mod here on the facebook page:
This mod only works for 210 type ULAs, other ULAs require a special circuit:
Join the SinclairZxWorld forum, there's lots of information available. The software was writtent in PokeMon's ZX-IDE which is a fantastic tool for ZX81 assembly programming.
OK, have fun!
Best regards,
Michel
on Jun 09, 2013, Dan Harboe Burer <d...@post.tele.dk> wrote:
-- Hello Michel,
If you make a kit (or a batch of PCBs , then I am interested :)
I just stumbled over - and bought - a ZX81 with Printer and 32K memory
expansion at a local Ham market !
Regards
Dan
-----Oprindelig meddelelse-----
From: Michel
Sent: Saturday, April 27, 2013 8:11 AM
To: neonixie-l
Subject: [neonixie-l] Re: ZX81 Nixie Clock
The open source code is now available for download:
http://xiac.com/ZX81/ZX81NixieClock.zip
Further instructions on how to use it can be found on the Sinclair ZX
World forum:
http://www.sinclairzxworld.com/viewtopic.php?f=6&t=1127
Michel
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