Shugart 50-pin, Shugart 34-pin, and SCSI \ VOGONS

Shugart 50-pin, Shugart 34-pin, and SCSI

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First post, by Vaudane

Posted on 2019-10-31, 14:18

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Thinking back on this post:
Re: 5.25 Floppy Not Reading

Some old 5.25" FDDs use a 34-pin Shugart interface, which itself is a stripped down version of the Shugart 50-pin interface for 8" FDDs. The Shugart bus later evolved into SASI, then SCSI, which as we all know, SCSI-1 was a 50 pin interface.

Since SCSI-1 is all about backwards compatibility, and thus is compatibile with SASI, If I used something like the FDADAP as mentioned on the vogons wiki (http://www.dbit.com/fdadap.html), can a Shugart interface 5.25" FDD 34-pin be connected to a SCSI bus (and work!)?

Reply 1 of 3, by Anonymous Coward

Posted on 2019-10-31, 15:11

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Ha. You managed to dig up something really obscure. I know what SASI is, but I have never in my life actually seen a SASI device, much less these 8 inch floppy drives with 50 and 34 pin Shugart interfaces. To get an answer you're going to have to ask a really old fart. I presume this stuff is from the late 70s or maybe early 80s. VCfed is definitely the place to ask, full of old farts. Maybe in the S100 section.

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Reply 2 of 3, by Caluser2000

Posted on 2019-10-31, 15:14

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Yeah vcfed.org is probably a better place to go. Chuck n Co. will sort you out fairly smartly.

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Reply 3 of 3, by derSammler

Posted on 2019-10-31, 15:26

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Simple answer: no. The Shugart bus used for floppy disk drives has no relation to SCSI or the earlier Shugart Associates System Interface. Both interfaces were defined by Shugart, but that's it.

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