Sad Mac when connecting external SCSI2SD to SE

[elemenoh]

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.

 

[aperezbios]

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.

 

[elemenoh]

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. 

 

[Trash80toHP_Mini]

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?

 

[elemenoh]

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.

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

 

[Trash80toHP_Mini]

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?

 

[elemenoh]

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?

 

[dochilli]

Perhaps you can use this tutorial:

http://www.savagetaylor.com/2018/01/05/setting-up-your-vintage-classic-68k-macintosh-using-a-scsi2sd-adapter/

Point 3 shows some configurations for the SCSI2SD. There are also some images with 6.0.8. and 7.5.5.

 

[cy384]

weirdly, scsi2sd can cause a sad mac if there's garbage data on the SD card, so try zeroing it out.