5 Jun
2012
5 Jun
'12
3:41 a.m.
. 2 x
CP7R : 5111 199 67589 (P857R CPU for P858,P859)
. 3 x CP7RA : 5111 199 62019 (P857R/A CPU for P858,P859)
What technology does this CPU use? 2900 bit-slice, ASICs, or what? The
P854 CPU is 3 cards, I think, one of which is the MMU (and one of the
others an IOP?, I would have to check the manuals). The P851 CPU is
a signle board, using Philips bitslice ICs... I'm hoping
CDD means Cartridge Disc Drive, and that these are the
controllers for the X1215 disk drives.
Althoguh I don't have the drive, I think I have the X1215 controlelr in my P854. From what I rememebr it's got an 8X305 chip
on it, which should
be easy to spot.
The card I suspect is the controller is labeled "5111 199 7817 CDD". The
cable that connects to the X1215 is labeled "X1215 CDD UP" on the top side.
The wires match up with the used contact fingers on the CDD board.
This card has 178 14 and 16 pin chips on it, all 74xx logic except for four
that are marked "F 9301 DC". Also an oscillator circuit built around a 10MHz
quartz crystal (a multiple of the 2.5 MHz data clock used in the X1215). It
also has 10 3-pin jumper blocks without any legend to it.
Cheers,
Camiel