4 Jun
2012
4 Jun
'12
8:29 a.m.
CPU BOX 4 - unlabeled, P856 type M4M box
. 2 x CDD : 5111 199 78176
. CDD : 5111 199 78177
. CDD : 5111 199 78178
. 2 x MCU3 : 5111 199 78198 (Paper tape, serial control unit fully
populated))
. MMU : 5111 199 75183 (Memory Management Unit)
. GPC : 5111 199 79382 (Custom card)
Box 4 just looks wrong. I don't know what the CDD cards are, but there
doesn't appear to be a CPU or memory in there. However, there are P856
CPU's
in the spare cards box, and I found references to the P856 being able to
use
MOS memory as well as core, so all might not be lost here.
In the p6000 system, we also had a MMU unit. It could be used for
expanding the basic memory above 32 KB, but also for relieving the main
unit. It frequently happened that the power supply in the main unit could
not deliver the necessary Amps, so a fully loaded main unit was a rare
sight. In those cases we used the MMU for the remaining cards. As far as I
remember, it accomodated extra 32 KB, a tape card and a SDLC/3780 card
/Nico