yea, im just trying to get parts gathered up now. already have the C code figured out, etc....
the transceivers used in the open source project were for the low voltage differential SCSI system while our mac scsi wasn't differential. They may/may not work. i would hate to use standard glue-logic for driving the SCSI bus, as it would take a LOT of room. theres still some figuring out to do. but ill figure it out.
the AVR cant source/sink enough current to drive the SCSI bus directly. have to use the transceivers or tri-state glu-logic. I have the dead WDS-280 drive of mine i can scrounge its connector off the logic board. that way i can "plug it in" to the powerbook SCSI chain. but for experimental reasons, i may build it all on a breadboard and use the external centronics SCSI for testing. Only issue with this is the termination impedance matching might be a bit difficult as being on a breadboard adds extra capacitance/inductance to a high speed circuit.
a single 2.5 board is pretty darned crammed. i may expand it to 2 boards sandwiched together. at least that would give me some wiggle room, and its still within the limits of the 2.5 HDD size constraints.
the transceivers used in the open source project were for the low voltage differential SCSI system while our mac scsi wasn't differential. They may/may not work. i would hate to use standard glue-logic for driving the SCSI bus, as it would take a LOT of room. theres still some figuring out to do. but ill figure it out.
the AVR cant source/sink enough current to drive the SCSI bus directly. have to use the transceivers or tri-state glu-logic. I have the dead WDS-280 drive of mine i can scrounge its connector off the logic board. that way i can "plug it in" to the powerbook SCSI chain. but for experimental reasons, i may build it all on a breadboard and use the external centronics SCSI for testing. Only issue with this is the termination impedance matching might be a bit difficult as being on a breadboard adds extra capacitance/inductance to a high speed circuit.
a single 2.5 board is pretty darned crammed. i may expand it to 2 boards sandwiched together. at least that would give me some wiggle room, and its still within the limits of the 2.5 HDD size constraints.