emu sp1200 main pcb in progress

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DogNamedLilly
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emu sp1200 main pcb in progress

Post by DogNamedLilly » Sun Sep 13, 2020 12:34 pm

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
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Re: emu sp1200 main pcb in progress

Post by DogNamedLilly » Tue Sep 15, 2020 3:59 am

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?

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tobb
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Re: emu sp1200 main pcb in progress

Post by tobb » Thu Sep 17, 2020 5:35 pm

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

Keep posting on your progress!

:tu:

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devinw1
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Re: emu sp1200 main pcb in progress

Post by devinw1 » Thu Sep 17, 2020 5:40 pm

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
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Re: emu sp1200 main pcb in progress

Post by MoyaMoya » Sat Sep 19, 2020 3:50 pm

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
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Re: emu sp1200 main pcb in progress

Post by 12bitgrit » Tue Feb 09, 2021 6:13 am

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
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Re: emu sp1200 main pcb in progress

Post by trainspotter » Mon Feb 15, 2021 10:08 am

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

Builderbc12
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Re: emu sp1200 main pcb in progress

Post by Builderbc12 » Mon Feb 22, 2021 7:50 pm

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

maxbobo
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Re: emu sp1200 main pcb in progress

Post by maxbobo » Sun Feb 28, 2021 10:17 am

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...

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EATyourGUITAR
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Re: emu sp1200 main pcb in progress

Post by EATyourGUITAR » Sun Feb 28, 2021 9:49 pm

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.
WWW.EATYOURGUITAR.COM <---- MY DIY STUFF

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devinw1
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Re: emu sp1200 main pcb in progress

Post by devinw1 » Mon Mar 01, 2021 2:03 am

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!

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