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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.<div>Thanks for the input!</div><div>Al<br><br><br><div class="yahoo-signature"><a style="font-size:12px" href="https://mail.onelink.me/107872968?pid=nativeplacement&c=Global_Acquisition_YMktg_315_Internal_EmailSignature&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000604&af_sub5=EmailSignature__Static_">Sent from Yahoo Mail for iPhone</a><br></div><br><p class="yahoo-quoted-begin" style="font-size: 15px; color: rgb(132, 115, 255); padding-top: 15px; margin-top: 0px;">On Monday, September 23, 2024, 9:10 AM, el macaco <elmacaco@hotmail.com> wrote:</p><blockquote class="iosymail"><div id="yiv6949498691"><div>
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<div dir="ltr">If it's like the Emax, it could be the floppy controller IC, 1774 or something like that.<span></span><span></span></div>
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Get <a rel="nofollow noopener noreferrer" shape="rect" target="_blank" href="https://aka.ms/o0ukef">Outlook for iOS</a></div>
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<div id="yiv6949498691yqt99094" class="yiv6949498691yqt7177877558"><div dir="ltr" id="yiv6949498691divRplyFwdMsg"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Roman via Synth-diy <synth-diy@synth-diy.org><br clear="none">
<b>Sent:</b> Monday, September 23, 2024 1:01:09 AM<br clear="none">
<b>To:</b> kogz23@yahoo.com <kogz23@yahoo.com>; synth-diy@synth-diy org <synth-diy@synth-diy.org>; grant musictechnologiesgroup.com <grant@musictechnologiesgroup.com><br clear="none">
<b>Subject:</b> Re: [sdiy] Emu Sp1200 format/write issues
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<p dir="ltr" style="margin-top:0;margin-bottom:0;">And unlike most of fb groups, people who give advices in that one actually know what they're doing.
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<p dir="ltr" style="margin-top:0;margin-bottom:0;">Plus the file section of it is full of ervice manuals.</p>
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<p dir="ltr" style="margin-top:0;margin-bottom:0;">Roman </p>
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---- Użytkownik grant musictechnologiesgroup.com napisał ----<br clear="none">
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<div>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).</div>
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<div>GB</div>
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<div>------ Original Message ------</div>
<div>From "al spitzley via Synth-diy" <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:Synth-diy@synth-diy.org" target="_blank" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a>></div>
<div>To "<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:Synth-diy@synth-diy.org" target="_blank" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a>" <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:Synth-diy@synth-diy.org" target="_blank" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a>></div>
<div>Date 9/22/2024 10:21:09 AM</div>
<div>Subject [sdiy] Emu Sp1200 format/write issues</div>
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Hi all,
<div>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.</div>
<div>I confirmed the 7407 buffer feeding most of the floppy lines is good. Confirmed the Z80 sio that handles the floppy is good. </div>
<div>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.</div>
<div>Thanks in advance!</div>
<div>Al<br clear="none">
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