MacSD inside a Mac Color Classic 'Mystic' - possible?

philwareham

New Tinkerer
Apr 26, 2026
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Hi there, I have a Mac Color Classic with the LC575 upgrade and video tweak to increase the resolution.

Wondering if it's possible to install a MacSD SCSI drive inside the chassis to replace the aging Quantum hard disk (and have it bootable from that). Has anyone done this and are there any tricky issues with doing this. or should I instead just look at having the MacSD in an external SCSI chassis and hook it up to the SCSI port (keeping the internal HD)? I know you need to remove the analog board to get to the drive housing, for starters.

Thanks for any advice.
 

Mark_W

New Tinkerer
Feb 2, 2026
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Never used macsd before, did a quick google search and found this picture on their website:

iso1-1024.png


If the scsi connector is placed at the middle of the pcb then no it won't fit in the cc, cc's scsi cable is quite short and is connected to the motherboard edge connector directly so you can't replace it easily. You can get an extension cable though, or just connect it to the scsi cable and let it hang upside down near the cutout for scsi cable, instead of mounting it to the hdd bracket. Or get bluescsi, they fit perfectly fine inside cc
 
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philwareham

New Tinkerer
Apr 26, 2026
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Thanks. Maybe I’ll get a BlueSCSI as well then (as I’ve already purchased the MacSD and it’s on its way from US to UK right now), and then have an internal and external drive option. It’s makes swapping out the SD card for transferring files easier anyway. Not sure I want to lose the floppy drive.
 

philwareham

New Tinkerer
Apr 26, 2026
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Hi YMK, I now have a MacSD inside my Color Classic Mystic and it boots and works fine. However, it seems to clash when I also add my BlueSCSI external onto the exterior SCSI port. Pretty sure all my SCSI IDs are unique so I guess it's a termination issue. What jumpers did you leave in the MacSD (if any), and do you have any external SCSI devices working along with it? Thanks for any help!
It's very possible, with a bit of work:

View attachment 28205
 

YMK

Active Tinkerer
Nov 8, 2021
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For my Mystic, I have the MacSD resistors set to VCC, with no external devices attached.

If you have a V2 BS, try disabling the termination. With a V1, it cannot be disabled.
 
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philwareham

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Apr 26, 2026
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What's wrong with BlueSCSI/SCSI2SD?

Nothing wrong with them at all, I have a BlueSCSI v2 as well. I bought the MacSD for its USB MIDI interface mainly, as I’m having freeze issues with an old serial port MIDI adaptor I’ve been trying to use. Not tested that part of it yet.
 

JDW

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What's wrong with BlueSCSI/SCSI2SD?
Not sure if that question is being asked as a jab at MacSD or something else, but I can vouch for MacSD being a great product, which isn't saying anything bad against other products either. In fact, on many compact Macs, including my SE/30 with accelerator, I've found MacSD to be equal to or faster than BlueSCSIv2. MacSD also pioneered the virtual CD changer prior to other products incorporating that feature. Again, that's not a shot against those other products. I'm just saying that MacSD doesn't get nearly the love it deserves. For more info, see my video review...