emu sp1200 main pcb in progress

[DogNamedLilly]

hello boom bap lovers out there!
i am just working on a new pcb of the sp 1200 main board.
i do this, because the original pcb is not available anymore.
if there is anybody out, who is also interested in a pcb, i can
do some more. i think, it is posssible, to build an complete machine with this, but
my intention is to help a friend to repair his totally broken machine,
and i want to cover some costs for the pcb manufacturing.
thanks for watching!
Adam

[DogNamedLilly]

I checked the schematics, and compared with the original pcb, I noticed different
IC´s, for example the ultrarare 74HCT504, which works as in combination with the DA as AD converter, is different on the pcb.
does anybody know something about that?

[tobb]

Depending on the asking price,it might be interesting to buy just as a spare part.

Keep posting on your progress!

[devinw1]

I've said it once and I'll say it again: If somebody does a DIY kit for a SP1200 clone, I AM FULLY ON BOARD!

[MoyaMoya]

How difficult is it to source replacement buttons?

I've looked before.. but seem to remember having a fairly difficult time, except for well the rather expensive N.O.S. ones on ebay.

[12bitgrit]

Would like a DIY sp1200 kit, or fully built out, 1:1. Same size, layout, etc.. It is a simple and straightforward machine that should be able to be built quickly and cheaply. Would absolutely love this

[trainspotter]

i’m in just got my sp1200 restored after years and would love a 1:1

[Builderbc12]

Please, Please, Please count me in!! I was literally just looking over the schematic for one and thing of creating an Adrunio version.

[maxbobo]

Count me in. I also have a totally broken machine (won't boot) and I believe the issue to be cold solder joints on the PCB... maybe.

I'm getting life on the CPU, clock, etc. And looking point to point I just can't find the issue yet. I'm not too familiar with Z80 tech, though.

Going to build the Retro Chip Tester Professional from 8bit-museum.de to test as much of the TTL logic, Ram, Pals as I can.

How would you handle ROM/PALs in your repair/rebuild? Are you planning to just migrate the ICs from the broken SP? I've seen an image for the main ROM somewhere, but I don't know if anyone has reversed the rest of the PALs...

[EATyourGUITAR]

I did a complete restoration on an alesis HR-16 drum machine that was on a boat in the navy. no new parts were required. you can work with the old parts if you know how to clean things without damaging them. I can cast the buttons on the SP-12 if someone wants to send me a master. I don't know if I can cast abs, nylon, or polystyrene but I can make a perfect copy by casting if you don't care about the material being %100 correct.

[devinw1]

I appreciate your enthusiasm EYG on that, and let me know if you've got any leads on one, but pretty average original sp1200s go for $5000+ these days, usually more like $8k!