Can't get PiSCSI to talk to a PowerMac 7600/200

[ozdemir-mehmet]

Hey all,

This PiSCSI is driving me insane. My setup is as follows.

PowerMac 7600/200
Internal Quantum 2GB SCSI ID:0
Internal SCSI CDROM ID:6

PiSCSI connected to the external 25pin SCSI port with a straight thru DB25 cable.

If no devices are mounted via PiSCSI then the Mac will boot into MacOS 8.6 fine. As soon as a device is connected to the SCSI bus, eg: RaSCSI-Boot-8.hda then the Mac just hangs on the boot screen. This happens whether termination is enabled or disabled on the PiSCSI.

I do see the following error in the logs:

Feb 25 08:07:55 PiSCSI PISCSI[434]: [2025-02-25 08:07:55.064] [error] (ID 6) - Not able to receive 1 byte(s) of data, only received 0
(note: this error was when I disconnected all devices on the internal SCSI bus and only had PiSCSI connected externally with a CDROM device attached)

Is anyone able to steer me in the right direction?

Update:
Setting logging to trace, I see this (in this example only PiSCSI connected externally and HDA is on ID:0)
Feb 25 08:16:51 piscsi PISCSI[434]: [2025-02-25 08:16:51.600] [error] (ID 0) - Not able to receive 1 byte(s) of data, only received 0
Feb 25 08:16:51 piscsi PISCSI[434]: [2025-02-25 08:16:51.600] [debug] (ID 0) - Error status: Sense Key $0b, ASC $00
Feb 25 08:16:51 piscsi PISCSI[434]: [2025-02-25 08:16:51.600] [trace] (ID 0) - Status phase, status is $02
Feb 25 08:16:51 piscsi PISCSI[434]: [2025-02-25 08:16:51.600] [trace] (ID 0) - Sending data, offset: 0, length: 1
Feb 25 08:16:55 piscsi PISCSI[434]: [2025-02-25 08:16:55.600] [trace] (ID 0) - Bus Free phase