Wanted: Commodore CBM disk drive cable

It's potentially rather more than that... And the number of people who know such repair information exists is consiterably higher... Let's hope... I am almsot sure it is, but it's complicated. It uses the 'DMA' feature of the 9830 (whcih si not what we'd now call DMA, it's not independant of the PCU, it's more a way of bringing the memory bus out -- serially -- on the I/O connecotr). The 'cable' -- an HP11273 -- has a PCB at each end in a housing that looks like the normal HP9800 I/O module. One plugs into the back of the 9830, the other plugs into a slot on the front of the 11305 disck controller. The HP9830 end contains the shift registers to handle the memory bus, the controlelr end has a 356 word I think it's actually 1K*4) RAM t oact as a sector buffer. I think it will all be stnadard ICs. After all, both the 9830 and 11305 are (well, apart from programmed ROMs). The only power line on the 11305 connecotr is +5V, all signals are TTL level. I hace a pinout of the 11305 conenctor, but that's not really enough to recreate it. Yes, I found that in a clearout pile at a place I was studying (the pile was labelled 'Please take any of this you are interested in', I took about 3/4 of it). I had it long before I had any 9800 machines. In fact that was a major clue in figuring out the hardware of the 9810 (the 9800 I got fitst) -- I had much of the I/O slot pinout from that book. Given that, I could find things like the I/O register, that led to the serial signals between the CPU sections, and so on. AFIAK there are no official scheamtics for the disk system though. I have an 'unofficial set' for the main 11305 unit, and a microcode lisitng for that. But nothing on the cable (for obvious reasons). -tony