[sdiy] Emu Sp1200 format/write issues

[al spitzley]

Sorry for not getting back. I found the issue yesterday. It was a CMOs counter ic, a 74393, that was preventing some other CMOS further down stream to operate correctly. IC 128 was the culprit.Thanks for the input!Al


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On Monday, September 23, 2024, 9:10 AM, el macaco <elmacaco at hotmail.com> wrote:

If it's like the Emax, it could be the floppy controller IC, 1774 or something like that.
Get Outlook for iOSFrom: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Roman via Synth-diy <synth-diy at synth-diy.org>
Sent: Monday, September 23, 2024 1:01:09 AM
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Subject: Re: [sdiy] Emu Sp1200 format/write issues 
And unlike most of fb groups, people who give advices in that one actually know what they're doing.

Plus the file section of it is full of ervice manuals.


Roman 


---- Użytkownik grant musictechnologiesgroup.com napisał ----

As much as I dislike Facebook, there is a Vintage Synth Repair group (that might not be the exact name) that is *very* active. Of course with Facebook there is no decent search-able archive, so you'd have to ask the question from scratch. Also there are a ton of SP1200 fan sites (if you haven't tried them already).
GB

------ Original Message ------From "al spitzley via Synth-diy" <Synth-diy at synth-diy.org>To "Synth-diy at synth-diy.org" <Synth-diy at synth-diy.org>Date 9/22/2024 10:21:09 AMSubject [sdiy] Emu Sp1200 format/write issues


Hi all,I have an Sp1200 that will not format or write to floppy. I’ve confirmed the drive is working on a different Sp1200. It reads fine. Tried a Gotek and still won’t write so it has to be something in the sp1200.I confirmed the 7407 buffer feeding most of the floppy lines is good. Confirmed the Z80 sio that handles the floppy is good. Now I’m getting lost as to where else to look. Anybody seen anything similar to this? Most advice I’ve seen is that it’s a bad floppy drive but I’m pretty sure that isn’t the issue here.Thanks in advance!Al

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