Re: scsi controller availability....

[david@uow.edu.au (David Wilson)]

"Paul R. Santa-Maria" <paulrsm@ameritech.net> writes:
>I have an Apple Rev C SCSI card.  It looks like it would be easy to clone. 
>There are two PALs and two large chips--an NCR 5380 and an RCA 6264.  The
>rest are all 74 series chips.  I know that the Rev C is considered to be
>almost the least capable of Apple II SCSI cards (only the CMS is beneath
>it), but I have been very happy with mine.

The Cirtech InSyder card has only 4 chips (if I remember correctly).

5380	SCSI chip
2764	EPROM
74LS???	8 bit data buffer
PAL	decoder

The trick is that if you want to handle an Apple Partition table then
you probably need on board RAM as the slot holes do not have enough space.
Handling removable disks should just need more code in ROM.
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia