Thread
Cant get SCSI2SD to boot Mac Plus
I've got a Mac Plus I'm trying to get working with a SCSI2SD card. Card seems to work, I just can't get the Mac to boot from it.
The original external APS 120MB drive boots the Mac Plus just fine, and I've got a copy of Apple HD SC Setup 7.3.5 that has been patched. I've setup the SCSI2SD card at ID 6, and made a 250MB partition on it with the patched HD SC Setup. The contents of the APS drive copy over just fine, and I've opened and closed the System Folder on the SD card to bless it.
Despite all that, I can't seem to get the Mac to boot from the card. If it's the only thing on the bus (and the terminator resistors are installed), when I power on the Mac I just get the blinking question mark. I don't see the activity light on the card flash at all from the initial bus scan or any sort of booting activity. I've also tried pulling the terminator resistors and using an external terminator with no luck.
What am I missing here?
Thanks,
Dave
The original external APS 120MB drive boots the Mac Plus just fine, and I've got a copy of Apple HD SC Setup 7.3.5 that has been patched. I've setup the SCSI2SD card at ID 6, and made a 250MB partition on it with the patched HD SC Setup. The contents of the APS drive copy over just fine, and I've opened and closed the System Folder on the SD card to bless it.
Despite all that, I can't seem to get the Mac to boot from the card. If it's the only thing on the bus (and the terminator resistors are installed), when I power on the Mac I just get the blinking question mark. I don't see the activity light on the card flash at all from the initial bus scan or any sort of booting activity. I've also tried pulling the terminator resistors and using an external terminator with no luck.
What am I missing here?
Thanks,
Dave
you need termination power. If the SCSI2SD has a jumper for built-in termination power, you have to select it.
I've got one of the new v5 boards that doesn't have the jumper.
Re-reading that last sentence, is it saying I need USB plugged in to power the terminators? I would have expected them to be powered by the molex plug.The J3TERMPWR jumper is not used on these boards. Due to the more efficient power supply (switching regulator as opposed to linear reegulator) USB power is sufficient to run run the terminator.
I'd ask Michael McMaster. I do not think that the terminators cannot be powered by the molex plug but then if there is no jumper anymore +5V from the molex would always be connected to the terminators and the TERMPWR line?!?
I'll ask him about that.
So, is there anything else I should be trying to make the card bootable? Other than not being able to boot from it, it appears to work fine.
As far as I remember*, only thing that should prevent it from booting would be something wrong with the driver or the system folder not being blessed.
* in the early 90s I was the lead engineer on the DiskFix and Optimizer products from Central Point. I used to know this stuff inside out, now that part of my brain is feeling very rusty.
So, is there anything else I should be trying to make the card bootable? Other than not being able to boot from it, it appears to work fine.
As far as I remember*, only thing that should prevent it from booting would be something wrong with the driver or the system folder not being blessed.
* in the early 90s I was the lead engineer on the DiskFix and Optimizer products from Central Point. I used to know this stuff inside out, now that part of my brain is feeling very rusty.
Have you tried giving Lido a go? Give it a full repartition and format. Lido takes care of the drivers too so that might fix the issue if the driver partition is messed up somehow.
Doesn't the plus need a resister soldered into place somewhere to provide termination power?
Edit: apparently a diode and a resistor, according to techknight
https://68kmla.org/forums/index.php?/topic/17130-scsi-ports-not-working-on-3-mac-pluss-confused/&do=findComment&comment=169787
Edit: apparently a diode and a resistor, according to techknight
https://68kmla.org/forums/index.php?/topic/17130-scsi-ports-not-working-on-3-mac-pluss-confused/&do=findComment&comment=169787
The newer plus boards actually have a diode placement on the PCB itself, you could just solder one in place and itll work fine.
Don't know which scsi2sd drive you have, but I have the external drive and it works great. If it's a standard internal scsi2sd, it might not work. Possibly a termination issue.
Mike is excellent at answering questions.
Mike is excellent at answering questions.
How big is this SD Card in the SD2SCSI adapter? what system are you using or the Mac Plus?I've got a Mac Plus I'm trying to get working with a SCSI2SD card. Card seems to work, I just can't get the Mac to boot from it.
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I've setup the SCSI2SD card at ID 6, and made a 250MB partition on it with the patched HD SC Setup. The contents of the APS drive copy over just fine, and I've opened and closed the System Folder on the SD card to bless it.
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Thanks,
Dave
The only thing I could see as a problem is the rest of the SD Card not being Partitioned and formatted. You should partition and format the rest of it up in 500MB Slices