mjs@rabbit.UUCP (M. J. Shannon, Jr.) (10/31/84)
We are anticipating the installation of a 785 upgrade to one of our
780's, and would appreciate any information from anyone who has already
installed the upgrade. Our configuration includes 3 mba's (1 w/1 RM03,
1 w/1 TU78, 1 empty for the moment), 2 uba's (1 w/6 DZ11s, 2 RA81s, the
other w/1 DR11, 2 RA81s, 1 DN11, misc others), 8 Meg (old boards).
Please let me know of ANY successes or failures, as I don't want to be
caught with my pants down when it gets here. Thanks much.
--
Marty Shannon
UUCP: {alice,rabbit,research}!mjs
(rabbit is soon to die. Does this mean alice is pregnant? Yup!)
Phone: 201-582-3199kvc@scgvaxd.UUCP (Kevin Carosso) (11/06/84)
Anyone considering a 785 upgrade should trade in your old memory
controllers and 1/4 meg boards for the new 1 meg boards. DEC
gave us two reasons for this. First of all they indicated that
the new boards would give a slight performance improvement over
the old ones (anyone know why this might be?) and every little bit
would help get the most out of the 785. More importantly, they
strongly suggested that 785's be configured with 12 meg, which
is impossible with the old controllers.
From experience, the 12 meg sounds reasonable to me. I know
my 780 uses nearly all 8 meg when loaded (under VMS with big
jobs) and it seems reasonable that 50% more processor could
use 50% more memory. Also, I know that I have a LOT more trouble
with memory errors on my system with 8 meg worth of 1/4 meg
boards than my other system with 8 meg of 1 meg boards.
/Kevin Carosso {ihnp4, allegra, seismo}!scgvaxd!kvc
Hughes Aircraft Co.