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LC II dual floppy ports possible with soldered connector?

zezba9000

Well-known member
Macintosh LC has two floppy connectors on its motherboard.
LC II only has one BUT has what looks like a spot for it. If I solder a connector here will it work?
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max1zzz

Well-known member
That port isn't a floppy connector on the LCII, it only has 16 pins and connects to the V8 not the SWIM
I have no idea what it actually is, so if anyone has any info on that I would be very interested!
 

Fizzbinn

Well-known member
Isn't the V8 video? WILD guess: Internal video connector for a never released all-in-one design?
 

cheesestraws

Well-known member
Per the Bomarc schematics, J18 picks up two unlabelled glue signals, three address lines, a clock and a lot of grounds. I have no idea what it's for: looks like it might as well be labelled "miscellaneous".

Screen Shot 2021-12-22 at 23.09.20.png
 

Addicted

Well-known member
I was pondering this question just last week.

Firstly, I think for a second floppy connector, you need only clone the existing connector but replace the new connector's enable line with the other enable line. You'd have to (carefully) solder a wire directly to the SWIM to get that signal, as it's a no-connect on the board. I was wondering if that's all it takes - if the OS/ROMs will poll that drive, if one is connected.

As far as J-18 goes.. no idea, but I will speculate. I was thinking it might be a diagnostic, development, or debug port.. not intended for product use. Allows attachment of logic that can drive the GLU to dump its state, do some sort of tracing, etc. No idea. I need to read more about what GLU does and what it is.
 
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