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Sad Mac when connecting external SCSI2SD to SE

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Getting chime then Sad Mac 0000000F / 00000002 whenever connecting an external SCSI2SD to a Mac SE.

 

I've tried the following:

- Changed out the ROMs to newer FDHD versions

- Connected to external CD-ROM which worked okay

- Made sure internal HDD was set to ID0 (since the volumes of the SCSI2SD are on 1,4,5,6.

- Disconnected the internal HDD

- Checked voltage rails OK

 

This SCSI2SD works fine on many other Macs.

 

Any ideas for what to check next? I'm kind of at a loss since SCSI seems to be working fine with the CD drive.

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It could be the 53C80 SCSI controller itself. Is it known to actually work? It's soldered down (not socketed) on the SE, I believe, but you might want to consider trying to replace it, if you don't know that it's functional.

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9 hours ago, aperezbios said:

It could be the 53C80 SCSI controller itself. Is it known to actually work?

It works fine with an external CD-ROM, but maybe it has some other fault. 

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Is the external version Termination Powered? Have you tried an external power source?

 

edit: which version of SCSI2SD are you using? Can the USB port be used to supply power?

Edited by Trash80toHP_Mini

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16 hours ago, Trash80toHP_Mini said:

Is the external version Termination Powered? Have you tried an external power source?

It's termination powered. I haven't tried external power yet, but haven't needed to on any other Mac. I'll give that a try though.

16 hours ago, Trash80toHP_Mini said:

which version of SCSI2SD are you using? Can the USB port be used to supply power?

I'm using the external 5.5. Yes, it has a port I can connect to try it out.

https://store.inertialcomputing.com/product-p/scsi2sd-v5.5-usps-int-1st.htm

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Good! My WAG was that your SE has weak termination power for whatever reason. Has it been recapped? Have you got a meter you can use to determine the power output level if the USB power test proves successful?

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So I tried with an external USB power source and it made no difference. I also tried with a couple other SE MLBs and hit the same issue. So it sounds like it might be some kind of config issue with the SCSI2SD. I might try disabling all but one ID and see what happens. Any other suggestions?

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