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Gimix floppy controller (and) How come there's no SS-50 heading under "Genres"?

circa77

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Wif yo mama.
Second question first:

Of course, everyone is going to want a section dedicated to "their" system. But I'd argue that the SS-50 actually deserves one, because it was the bus second in popularity only to S-100 in the original hobby micro era. Like MITS, SWTPC existed for years before putting out their 8080 and 6800 systems (respectively), and their buses caught on enough to spawn a lot of companies making compatible hardware. So whose decision is it to add it as a major heading, and if not, why not?

Now, to Gimix:

In digging through my hardware (some of which is being sold on ebay), I've turned up a few Gimix pieces. They built, to my mind, the highest-quality SS-50 boards, but it's extremely hard to find anything on them. The example at hand is one of their 58 (or "5/8"?) floppy controllers, which is apparently capable of 5" and/or 8" operation. This one appears to be (partially-) populated for 5" use, but since it's fully-socketed I can't tell whether the empty sockets are for chips unnecessary for 5" operation - or have been looted over the years. So I'd love to get my hands on a manual for it, or even just hear from someone who has one of these boards and can tell me how it's populated.

Thanks.

Jonathan

gimix58.jpg
 
Yeah, that's what I figure, but it doesn't mean it needs to be fully-populated in order to run only 5".

Hence the question. Someone must have one - or just the docs.
 
Yeah, that's what I figure, but it doesn't mean it needs to be fully-populated in order to run only 5".
Why would fewer IC be needed for the 5"1/4?
Apart from the TG43 signal often needed for the 8", I don't think there are any other differences.
Having said that, I think there's room for lots of ICs just for a floppy controller

A comparable controller: https://deramp.com/swtpc.com/DC_2/DC2_Index.htm
 
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I can't answer that question because at this point it's an idle query rather than my seriously digging into the problem.

The SWTPC is certainly functionally comparable, but beyond that there's little to compare other than the 1771. Just count the ICs/sockets.
 
From the catalog entry (on bitsavers), the gimix #58 looks to have shipped in two versions, one for 5 1/4 drives only, and a second supporting both 5 and 8 inch drives.
Your card looks to be the 5" only version, as the 50 pin 8-inch connector, dip switch block are not populated on your pcb, and another IC socket replaced with two jumpers.
Unfortunately, the catalog scan doesn't quite reveal part numbers and can't say for sure if you're missing needed chips.

I have the other Gimix SS-30 controller version, w/1797, the Gimix #28 and am also looking for documentation (the card does function as is though).

GIMIX Catalog #28 and #58.pngGIMIX #58 vs Catalog.png

Here is my gimix #28 for comparison
GIMIX #28 reduced.png
 
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Yes, I looked at that too (and I have an original hard copy catalog that shows it) and found the same thing - that you can make out enough information to confirm what we know but not high enough resolution to get anything useful.
 
From the catalog entry (on bitsavers), the gimix #58 looks to have shipped in two versions, one for 5 1/4 drives only, and a second supporting both 5 and 8 inch drives.
Your card looks to be the 5" only version, as the 50 pin 8-inch connector, dip switch block are not populated on your pcb, and another IC socket replaced with two jumpers.
Unfortunately, the catalog scan doesn't quite reveal part numbers and can't say for sure if you're missing needed chips.

I have the other Gimix SS-30 controller version, w/1797, the Gimix #28 and am also looking for documentation (the card does function as is though).

View attachment 1279920View attachment 1279921

Here is my gimix #28 for comparison
View attachment 1279922
I'm looking for a Gimix #28 to replace my severely damaged board ( in long process of rebuilding) f you would like to part with yours. I do have documentation for you when I get to scanning it. I have Gimixbug9 and the boot rom for this card.
Advise, thanks.
 
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