The picture on the left is actually taken of the disk controller in my MC68000 based disk exerciser; the original project where the UDSS circuit came from. Note the 3x FDC adjusment presets to the right of the FDC chip and the standard 34pin header immediately above, which interfaces to a standard �PC� type floppy drive cable. (The 25 way �D� connector at the top was the serial connector)
In the following downloadable files shown below, there should be sufficient hardware and software information to start anyone off on a UDSS project if they are interested. Some of the information however, is simply there for reference purposes.
A few notes on the actual byte level structuring of the JDOS disk format.
This is a printout of the JDOS �Dump� facility. THe �J� prompts can be seen on the printout a total of four times, along with the �dumped� printout of the memory contents at that time.
This is a �dump� of an Acorn BBC B disk showing the absolute information from a disk sector. Well you see it�s like this... I was given a BBC computer with a single disk but no FORMAT disk to make new disks with. So what better use to put the new UDSS to? �BEEB FORMAT� program on the UDSS will change the encoding / decoding from MFM to FM then will format a disk to be used with the BBC DFS (disk filing system). And it really works!!
