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12.
INSTALLATION PROCEDURE.
r
13.
Unit Installation. Install disc memory units as follows:
a. Turn off the computer POWER switch.
b.
Refer to the Disc Memory Power Supply Manual (see figure 1, item 28),
and install the disc memory power supply.
c. Refer to the Disc Memory Manual (see figure 1, items 26 and 27), and
install the disc memory.
14.
Interface Kit Installation. Install the Data Channel card (part no. 12606-
6001) and the Command Channel card (part no. 12606-6002) as follows:
a. Select the two most convenient consecutive input/output slots in the com-
puter and plug the data channel card into the slot with the lower select code.
b.
Plug the command channel card into the slot with the higher select code.
c. Connect the two hooded 48-pin connectors (DISC COMMAND and DISC
DATA) of the Interface Cable (part no. 12606-6003 or 12606-6004) to the com-
mand channel card and the data channel card.
d. Connect the single 50-pin connector of the interface cable to connector J10
on the rear of the disc memory chassis.
e. Slide the Track-Protect switch on the data channel card down, toward the
center of the card.
f.
Turn on the computer, load the diagnostic test program into the computer,
and check the resulting print-out (refer to the Diagnostic Program Procedures
Manual Supplement for instructions).
15.
OPERATION.
16.
Organization. The Disc Memory is organized
as
follows:
Model
Discs
Tracks
(expanded)
Sectors/Track
Words/Sector
Bits/Word
Storage (Bits)
(expanded)
12606-9001
2770A/2770A-Ol
2
32
64
90
64
17
3,133,440
6,266,880
2771A/2771A-01
4
64
(expanded)
128
90
64
17
6,266,880
12,533,760
5
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