> I have the same problem on my LCII with a quantum drive.  The only kernel
> I have had success with is SBC #15.  The later SBC kernels freeze up at
> the same place "sbc0 at obio0: options=1<PDMA>" except for #26 with
> freezes at a different line.  I forget where it freezes, I haven't tried
> booting it in a while.

Same problem on my IIvx. In case folks havn't noticed there's a trend here.

The LCII/IIvx/Performa 600 use the V8/VASP chips as their main clock/control
chip and I would imagine that they also use the same variant of the SCSI
controller. (The VASP is almost a direct derivative of the V8 gate array
for those not up on their Apple Technotes)

There is apparently something we don't understand about the V8/VASP chips
that is casuing SCSI problems. The SBC problem is one, the kernel size SCSI
bug with NCRSCSI kernels is likely another (though, that is likely related
to a memory mapping problem as well).

Right now we seem to be making the assumption that the LC/IIvx machines
function nearly identically to the IIsi/IIci which use the RBV chip as
their main clock/controller. Trouble is, while all the chips are pretty
much the same, there is some tiny obnoxious difference that crops up
that we don't quite handle.

Sure wish we knew what that was :-)