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Home Forums 68kMLA MacSCSI by John Bass AT LAST! — #32
Post #32 by Bunsen
Source Forum68kMLA
CategoryHardware
Post DateThu, 7 May 2009 - 05:21
Original URLhttps://68kmla.org/bb/threads/macscsi-by-john-bass-at-last.17224/
Post
Returning slightly to topic*

the Bass project / use it as a base point.
it seems to me we are closer than ever
if someone does decide to program up a new driver / 53C96 SCSI chips / It's getting the software drivers written and figured out that's tough.
the most difficult part is still going to be to adapt this driver
So as I understand it:

Given that the discovery of this listing (three cheers, Mac128!) does indeed get us "closer than ever", and requires only reading and writing to two addresses, and that at least some adaption of Bass's source code will be necessary to allow for modern drives and modern parts; is it at all conceivable that it could be adapted to:

  • faster SCSI chips (such as this one)
  • IDE/ATAPI controllers
  • 8-bit ISA cards, (and thence IDE, NICs, etc) as has been demonstrated on PIC and AVR micros
  • embedded USB host controllers such as the £8.25 Vinculum and its various ready-rolled versions
while still appearing to the System/Finder as a known object?

DOVE MacSnap SCSI adapter / looks exactly like the John Bass schematics, though with a few more resisters and capacitors as well as terminators
Scans?
uses the same 5380 SCSI chip / requires 128K ROMs, which suggests that it relies on the SCSI software and drivers within the ROMs /. the Dove board might work perfectly well with the 64K ROMs as long as the drivers and formatting software are present in the System file.
Conversely, is extracting the routines from the 128k ROM and inserting them in the startup System an option?

*(I know that my imagination runs ahead of my knowledge at times. I am trying to be constructive here, I swear :b&w: Feel free to run with any of these thoughts, shoot them down, or ignore them)

mp.ls