7 Jul
2006
7 Jul
'06
11:32 a.m.
Jules Richardson wrote:
Noted.
Don Y wrote:
That would be my assumption, too - presumably they'd need more I/O lines
than the parallel port has available... (I'll see if I can find time to
grab the datasheet later though...)
The 5380 makes sense if you are talking to the bus
(ISA, SBUS, etc.). I think the suggestion is to find
something that already has a 5380 on it and talks to
your bus-of-interest. The 5380 is really quite dumb
so it would be like having a "custom-parallel-port-
designed-with-SCSI-in-mind" :>
5380's are VERY simple minded, and will work with little programming on
older controllers like the Xebec 1403 in the picture.
Yes, but interfacing a 5380 to a parallel port is just as hard
as a bit of glue logic. And, harder
for him to come by
(I think I have a tube of them here from an old project...)
Actually, I almost certainly do have some amongst the cache of
ex-workshop Torch spares - I believe that chip was used in the Triple X
(at the very least I have spare Triple X system boards on which that
chip will be socketed).
I'm not so keen on it as a preservation solution though (even assuming
it could be used) as it's not the sort of chip that everyone's going to
have just lying around; a bunch of LS TTL chips are a lot easier to come
by! Plus of course there's the issue of whether
it'd happily talk to a SASI
target or not - quite possibly it's stuck firmly in SCSI-land.
I suspect you would have no problem there. The 5380 does
very little by itself (it wants to interrupt on damn near
every bus phase change...)