General Category > Lisa Troubleshooting and Repair
Lisa Sun Remarketing scsi card 92 error
sigma7:
--- Quote from: bmwcyclist on June 06, 2025, 11:14:31 am ---Any suggestions or help would be appreciated
--- End quote ---
1) edit: It appears I was incorrect and the labelling for this particular brand/part is indeed 220/330 for the 220 + 330 ohm variety of the network.
I think the terminator arrays (R2 & R3) may not be the correct part. They should be 220 ohm/330 ohm terminator networks, which are typically labelled as 221/331 since the last digit is a 10's multiplier. The pictured parts' 220/330 suggests to me they are 22 & 33 ohms. You could double-check with an ohmmeter by measuring resistance from pin 1 to pin 7 and pin 1 to pin 14.
For a short SCSI bus with one host and one device, often one needs only one set of terminators. For a longer bus or multiple devices, two sets are used/needed (one set at each end of the chain). Since your bus is very short, you can try removing the terminators from the SCSI card and just use/enable the ones on the BlueSCSI.
2) However, I think error 92 indicates the CPU ROM thought it found an expansion card ROM with code to be checksummed, which is not correct for the stock SR EPROM (it should be all 00s except for an ID byte). If you can dump the ROM with BLU or an EPROM burner or even just look at it with service mode, that may reveal an issue. If the ROM doesn't have the expected ID byte then MW+/II won't recognize it as a SCSI card, possibly matching the symptoms you describe. I believe the BlueSCSI light will flash when the host attempts to access it, so if you don't see any flash when booting MW+/II then it suggests the SCSI port wasn't recognized (and/or it could be the terminator problem above).
3) The XLerator SCSI should work regardless of the SCSI card. If you remove the SCSI card and plug the BlueSCSI into the XLerator SCSI port, MW+/II should be able to access it once booted (from the Parallel drive or a floppy). Again the BlueSCSI's terminators should be enabled as the XLerator does not have terminators.
4) In the picture, I see the mounting bracket for the XLerator SCSI is the early galvanized type. When mounted to the back panel, the galvanizing on the bracket was found to cause problems with some drives, so the brackets were replaced with stainless steel ones. A work-around for this potential problem is to leave the bracket unattached (ie. insulated) from the back panel so the galvanized bracket is not grounded.
bmwcyclist:
Wow fabulous reply. Thank you.!
bmwcyclist:
--- Quote from: sigma7 on June 07, 2025, 04:35:48 am ---
1) I think the terminator arrays (R2 & R3) may not be the correct part.
--- End quote ---
Photos attached. They seem to match my passive terminator.
--- Quote from: sigma7 on June 07, 2025, 04:35:48 am ---2) However, I think error 92 indicates the CPU ROM thought it found an expansion card ROM with code to be checksummed, which is not correct for the stock SR EPROM (it should be all 00s except for an ID byte).
--- End quote ---
Well crap. I don't have an EEProm burner. If it is bad is the ROM code posted somewhere? I have a couple of friends with burners.
--- Quote from: sigma7 on June 07, 2025, 04:35:48 am ---3) The XLerator SCSI should work regardless of the SCSI card.
--- End quote ---
I agree. It works fine without the card in.
--- Quote from: sigma7 on June 07, 2025, 04:35:48 am ---4) In the picture, I see the mounting bracket for the XLerator SCSI is the early galvanized type. When mounted to the back panel, the galvanizing on the bracket was found to cause problems with some drives, so the brackets were replaced with stainless steel ones. A work-around for this potential problem is to leave the bracket unattached (ie. insulated) from the back panel so the galvanized bracket is not grounded.
--- End quote ---
WOW, good to know. I will see if I can stop it from grounding.
bmwcyclist:
--- Quote from: Kelly king on June 06, 2025, 04:26:38 pm ---
Try using the slot that is covered. That is where my SCSi card is seated.
Good luck. I enjoy all your posts.
--- End quote ---
Thanks for the suggestion, I tried it in the other slot and no help this time. I will (assuming I get it fixed) continue to use this slot for all future use.
bmwcyclist:
--- Quote from: sigma7 on June 07, 2025, 04:35:48 am ---If the ROM doesn't have the expected ID byte then MW+/II won't recognize it as a SCSI card, possibly matching the symptoms you describe. I believe the BlueSCSI light will flash when the host attempts to access it, so if you don't see any flash when booting MW+/II then it suggests the SCSI port wasn't recognized (and/or it could be the terminator problem above).
4) In the picture, I see the mounting bracket for the XLerator SCSI is the early galvanized type. When mounted to the back panel, the galvanizing on the bracket was found to cause problems with some drives, so the brackets were replaced with stainless steel ones. A work-around for this potential problem is to leave the bracket unattached (ie. insulated) from the back panel so the galvanized bracket is not grounded.
--- End quote ---
no blinky blinky on the BlueSCSI when using the Sun SCSI card.
ADHOC I have isolated the back plate with scotch tape until an upgrade can be acquired. (don't tell anyone, it looks embarrassing.. ;) )
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