> > > I have an Ampro Little Board Plus, which is a single-board Z80 computer > the size of a 5 1/4" disk drive. The "plus" means it has a SCSI > interface. A couple of years ago I was planning to build a flash disk for > it and dug through a lot of specs and bios code. Original SCSI was almost > identical to SASI and they were often interchangeable. The protocol is > rather simple, as you stated. What I found in the Ampro bios code was that > for reading and writing only about 4 commands were used. Another small > number were used for formatting. I think, iirc, there were two types of > read and two types of write. I never got around to building the thing, but > it should be pretty simple. I would also be rather surprised if no one > else has done it. But if you have the P-2000 bios code, you could take a > look. I suspect it would be very similar to the Ampro code. > > Alas there is no source of either the CBIOS or the boot ROM in any of > the P2000C manuals and I suspect such source was never released. But > it should be possible to kludge up something to do the SASI handshake > and see just what does come out of that port when I try to boot from a > hard disk or whatever. >
SCSI2SD has been around for many years. There are a few variants of it. I think version 5 is still the one that is compatible with more systems than the others. There is also the BlueSCSI-project (a fork of the ArdSCSIno-STM32 project) which has evolved during the past few years. Since SCSI basically is a superset of SASI they should work. They at least work in my ABC1600 which has a very basic SASI interface. And then there is another project called RaSCSI/PiSCSI which is using a RaspberryPi of some sort to emulate SCSI. Pick whatever you feel comfortable with (and is available - the chip shortage is a big problem for many of these devices) /Mattis > > -tony >
