Further caveats about SCSI HDDs and the Plus/SE/Classic 68000 Macs may be found in these threads:
http://68kmla.org/forums/viewtopic.php?t=1606&highlight=interleave
http://68kmla.org/forums/viewtopic.php?t=1485&highlight=interleave
The re-use of the 68000 in the Classic was three years after the SE, and separated by the release of half-a-dozen 68020/68030 Macs. Twenty-odd years later not everyone remembers that even SCSI had its quaint little ways when it was new. The interleave factor of 2:1 for HDDs in the SE was a direct function of its slow SCSI port, which is another argument for not exceeding 120-160MB when you search for another HDD for your thinly-disguised SE called a Classic. It should, however, be using an interleave of 1:1, but only at a blistering 1.25MB/s.
Jumpering of the drive for SCSI ID may not offer much difficulty. Early Quantum HDDs (amongst the commonest, especially in 40-80-120-160-240MB sizes) did not encourage much intervention by users. There was only one ID available, viz 0-0-0, and termination was enabled/disabled with removeable in-line resistor packs. Later Quantums did have the A0-A1-A2 jumper positions for SCSI ID, and a TE (termination enable) jumper position, but termination power still had to come from the SCSI bus.
de
http://68kmla.org/forums/viewtopic.php?t=1606&highlight=interleave
http://68kmla.org/forums/viewtopic.php?t=1485&highlight=interleave
The re-use of the 68000 in the Classic was three years after the SE, and separated by the release of half-a-dozen 68020/68030 Macs. Twenty-odd years later not everyone remembers that even SCSI had its quaint little ways when it was new. The interleave factor of 2:1 for HDDs in the SE was a direct function of its slow SCSI port, which is another argument for not exceeding 120-160MB when you search for another HDD for your thinly-disguised SE called a Classic. It should, however, be using an interleave of 1:1, but only at a blistering 1.25MB/s.
Jumpering of the drive for SCSI ID may not offer much difficulty. Early Quantum HDDs (amongst the commonest, especially in 40-80-120-160-240MB sizes) did not encourage much intervention by users. There was only one ID available, viz 0-0-0, and termination was enabled/disabled with removeable in-line resistor packs. Later Quantums did have the A0-A1-A2 jumper positions for SCSI ID, and a TE (termination enable) jumper position, but termination power still had to come from the SCSI bus.
de