On Sun, Nov 17, 2013 at 06:55:01PM -0500, Mouse wrote:
I've even
plugged a machine's external SCSI connector into a SCSI card on my
PC, which lets both machines access the disk simultaneously.
Don't you run
into issues with both host adapters trying to use ID 7?
Host adaptors aren't *required* to use ID 7, but many are hardwired to that
because it's the simplest (and cheapest) way to do it.
I used an AHA-1510 for this. It, and a whole load of other low-end ISA SCSI
controllers used the same controller chip, the AIC-6260. I've pulled out the
datasheet: it can do "up to" 4MB/s, thanks to it being limited to 8 bit ISA DMA
or 16 bit PIO, and its buffer is smaller than a disk sector. It really is an
utter pile of crap, and is the kind of hardware that gave PCs a bad name.
However, because it's as dumb as bricks and offloads onto the host CPU, the
SCSI ID can be changed at will in the driver. This was one of the two reasons I
held on to the card rather than take a sledge hammer to it. The other reason is
that I didn't have a sledge hammer.