jmacz
Well-known member
Got bored, so decided to convert one of my internal SCSI Fujitsu magneto optical drives into an external drive.
Rather trivial, just needed to figure out the power situation and then convert from an internal 50 pin connector to a DB25. These MO drives only need +5V (the 12V is not connected on the molex power connector on the drive) so it's straight forward.
I decided to combine a SCSI adapter, a 5.5mm barrel plug port, a small set of dip switches for the SCSI ID, all onto a single PCB design and get it made via jlcpcb.
Then the fun part was designing an enclosure. I wanted it to fit the aesthetic of the Macintosh II series. So I came up with this design:
That's the bottom plate that the MO drive and PCB will mount to. It matches the ribbed design of the Macintosh II case. And then here it is with the top.
Then printed it out on my 3D printer in PLA. The walls are thick (2mm) so even with PLA, the case is really solid/sturdy. With the bottom part printed out and components soldered onto the PCB, I decided to test it out:
Everything fit nicely. The power brick is a 5V 4A adapter and it works fine. The MO drive specs shows a peak current requirement of 2.5A so it should be fine. I went with dip switches for the SCSI ID as I didn't have much luck finding a reasonable rolling SCSI ID selector. I had left one dip switch to enable/disable termination but that was dumb (I wasn't thinking) since I only have one SCSI port so that makes no sense since it needs to always be enabled as it will be the last device in the chain.
And here it is fully assembled from various angles. Yes, I cracked part of the top as I was about 0.5mm too narrow on the hole I made for the power switch.
I will need to fix that later with a reprint at some point.
Another shot.
And another.
I will probably make a reprint of the case (to fix that crack near the power switch) and then paint it my usual gray color to match my refinished Macs.
I still do have 4 of the PCBs available. I might make one more with a 2.3GB drive (the one pictured above is a 640MB drive).
Rather trivial, just needed to figure out the power situation and then convert from an internal 50 pin connector to a DB25. These MO drives only need +5V (the 12V is not connected on the molex power connector on the drive) so it's straight forward.
I decided to combine a SCSI adapter, a 5.5mm barrel plug port, a small set of dip switches for the SCSI ID, all onto a single PCB design and get it made via jlcpcb.
Then the fun part was designing an enclosure. I wanted it to fit the aesthetic of the Macintosh II series. So I came up with this design:
That's the bottom plate that the MO drive and PCB will mount to. It matches the ribbed design of the Macintosh II case. And then here it is with the top.
Then printed it out on my 3D printer in PLA. The walls are thick (2mm) so even with PLA, the case is really solid/sturdy. With the bottom part printed out and components soldered onto the PCB, I decided to test it out:
Everything fit nicely. The power brick is a 5V 4A adapter and it works fine. The MO drive specs shows a peak current requirement of 2.5A so it should be fine. I went with dip switches for the SCSI ID as I didn't have much luck finding a reasonable rolling SCSI ID selector. I had left one dip switch to enable/disable termination but that was dumb (I wasn't thinking) since I only have one SCSI port so that makes no sense since it needs to always be enabled as it will be the last device in the chain.
And here it is fully assembled from various angles. Yes, I cracked part of the top as I was about 0.5mm too narrow on the hole I made for the power switch.
I will need to fix that later with a reprint at some point.Another shot.
And another.
I will probably make a reprint of the case (to fix that crack near the power switch) and then paint it my usual gray color to match my refinished Macs.
I still do have 4 of the PCBs available. I might make one more with a 2.3GB drive (the one pictured above is a 640MB drive).
