So, there's an HD-20 that can be used on the floppy port of both a 512k and a Plus. I'm guessing if I wanted to, I could use a ribbon cable and attach it to the internal drive connector assuming I had the 128k ROMs installed.
So I got to thinking ... the HD-20 is too big to fit the parts into the case and it would certainly use too much power and create too much heat. BUT, what if I could fit a 2.5" powerbook SCSI HD inside the case?
Basically, I've already done this in my Color Classic with a 2.5" to 3.5" adapter. I think it would be a no-brainer with an SE as it has an internal SCSI connector. A Plus is a little more complicated as it only has an external SCSI connector and a 512k has no SCSI connector without a hard-to-find add on board (though if I found one, I could use the connector inside the Mac's case).
Here's the rub -- I want to use the 512k case, so even if I could modify the Plus logic board to add an internal SCSI connector, it wouldn't fit in the 512k case. CAN an internal SCSI connector be added to the Plus by just tapping into the logic board somehow? The easiest thing to do would be to find a SCSI expansion kit -- anybody got any ideas about that or any experience? Will a Mac 512k boot from a SCSI drive connected to these expansion kits?
NOW FOR THE CHALLENGE HACK -- the 512k will use a HD-20. There is plenty of room in a 512k for the HD-20 controller board to plug into the internal drive connector and a 2.5" SCSI hard drive -- not to mention the smaller drive puts off very little heat. I've always heard the HD-20 is basically a Rodime SCSI drive and that there were conversion kits that simply required bypassing the Apple controller with a new circuit board and turned your HD-20 into a SCSI drive. Seems to me the 2.5" SCSI drive could likewise be adapted to use the HD20 controller. Anybody got any ideas how I would go about it?
The HD20 has a 26-pin connector to the controller board. This seems a lot like a DB-25 SCSI connector. If I had a pin-out, it might be a simple matter of building a converter from the 26-pin connector to the 2.5" drive connector.