Thanks! And also thanks for attaching showconfig and expdump output
Dump looks valid. Dump has same 32k data twice and amiga.resource.cx photo shows 27C256 EPROM, so I guess they changed to 27C512 in later revisions.
EDIT: Hardware appears to be same as used in e-matrix 530/ and typhoon mk2. mtecscsi.device "(M-Tec SCSI Treiber)" driver version is 2.3.