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Hardware Structure of the CDS _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 37
Disk Interface
Module Option
CDP18S813
Slot 24 of the CDS is reserved for the optional Disk
Interface Module. This module communicates with
the disk drive unit through three byte
110
ports,
buffers, and a 50-conductor flat cable. Its block
di~gram is given in Fig. IS.
- The first output port, used for commands to the
drive unit, is written to by a 65 output instruction
with the 1/0 select register set to 01. Seven command
bils are sent to the drive unit through a grounded-
emitter open-collector transistor driver. The least
significant bit is gated by the service request (SR)
generated by the output port to provide a clock
strobe.
Data is sent to the drive unit through a second
output port loaded by a 64 output instruction. All
eight bits are transmitted through
~ounded-emitter,
open-collector transistors .
Data or status information from the drive unit is
recei ved by an in put port, which is read by a 6E
instruction.
Microterminal Option
CDP18S021
Provision has been made to allow installation of the
Microterminal and its ROM into the CDS. The
Microterminal consists of a hand-held keyboard and
display unit, its cable and mating connector, and a
ROM
contammg
a
utility
program
UTS.
A
photograph is given in Fig. 16.
To install the Microterminal:
1.
Turn power off.
2.
Extract the ROM
/
RAM module from slot 9.
3.
Install the ROM in the empty 24-pin socket
US. (The center of three 24-pin sockets)
.
4.
Re-insert the ROM/RAM module into slot 9.
5.
Insert the Microterminal cable connector into
J2, the 20-pin connector on the outboard side of the
Control module in slot 25. Carefully observe proper
polarity by matching the index arrows on the
connectors.
6.
Set the switch on the ROM/RAM module to
its up position.
OUTPUT'65'
OUTPUT
f-S'--R
_ _ _ _
--1
CPUO
STROBE
OUPUT '64'
DATA BUS
-I1 - - -
-+-toI
[7;~
-P
PORT
COMMANDS
DATA
7:
1
OUT PUT
PORT
DATA
DATA
[7:0]
tV
DATAl
TO
DISK
DRIVE
CONTROLLER
INPUT '6E'
INPUT
PORT
1 - -......
- - -
Dr [7 :0J
i~g~us
SELO -P
92CM- 296
1
9
Fig. 15 - Disk Interface Module CDP18S813
block diagram.
CONTROLLER
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