On Sun, Nov 27, 2016 at 8:48 AM, jos <[email protected]> wrote: > On 27.11.2016 08:10, Tony Duell wrote:
>> There's an 8X300 on the hard disk controller (Philips X1215 drive) for the >> Philips P854 computer. But I suspect that is too obscure even for this >> list. > > > Why too obscure ? How many P854 machines have you come across :-) > > The Philips P851 mini also uses a 8X300 / 8X330 combo for floppy & HD > controller. The P851 and P854 use the same bus, essentially (the P854 has memory management logic in the CPU, so has more address lines) and many I/O boards will work in both machines. So I thought this was going to be the same board > Picture of this controller and dumps of proms are on : > > ftp://ftp.dreesen.ch/WD1001 But it isn't -- quite. I wonder if I have a very early version of it, as the only info i have on it is a photocopy of a hand-drawn block diagram. My P854 has the normal 2-board set for the floppy controller, I have an indentical one in the P851. Whether the hard disk controller could handle floppies, or whether that was added to later versions I don't know, I do have the same headers at the front edge of the board (the 50 pin one is for the X1215 hard drive which alas I don't have). > > If there is a chance to have a good pic of the P851 frontpanel I would > appriciate it ! I can take one. You do mean P851 and not P854 here, I assume (I have both). > > Too bad the 851 CPU uses ASIC for datapaths & control logic, so I cannot get > this system up and running since it misses the control one. The PLANET (PLA NETwork)? The one that handles microcode branches? I only have one spare (and 4 spare SPALUs (Scratch Pad and Arithmetic Logic Unit) -- the 4-bit bit-slice for the data path) and I really need to keep it as a spare for my P851. -tony
