23 Sep
2009
23 Sep
'09
1:28 p.m.
-------------- Original message from Christian Corti <cc at
informatik.uni-stuttgart.de>: --------------
On Tue, 22 Sep 2009, William Maddox wrote:
The system looks to be a 990/10 CPU and a CD
1400
cartridge disk drive in a short pedestal rack.
Does anyone have actual maintenance prints for the
990/10? I looked on bitsavers, and there is a tech
manual with theory of operation, but no prints.
....... snip ..... I have the print sets; they came with the half dozen
of 990/10 we
got some time ago. We also have some 990/12 (also with print sets) and
990/4.
Christian, could you look at the print sets that came with the 990/12
and see if they cover the 990/12a or A13 chassis
I have a 990/12a which is a later model. Has a 13 slot cage with the
cards in a horizontal position. The power supply is dead .
I have not been able to find the drawings for it. The power supply
is a single board switch mode supply with only connectors to
the back plane and power in. Very simple looking. The earlier
systems seem the have much more complicated power supplies.
- Jerry
Christian