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•
On-Board ROM:
•
Directly Addressable Memory:
• Clock Frequency:
Circuit Board Dimensions:
• Power Requirements:
SPgCIFICATIONS
Word Size:
Address
Data
16 bits
8 bits
2/4/8 Kbytes
64Kbytes
4 MHz
5.25"x 10"
+8V
@
900 rna
+16V
@
50 rna
-16V
@
50 rna
CONNECTIONS
The 971 connects to the S-100 bus through the gold plated pins on the bottom
edge of the board.
In addition, there are four connectors on the top edge of the
board.
In a 5000SX, J1 and J2 (the two wide connectors) are connected to
channels 1 and 2, respectively, on the I/O panel on the back of the system.
In a
50 OOIS, J 2 is connected to the serial printer port on the back of the machine,J 3
(a smaller connector) is connected to connector
J5
on the 662 Video Display
board, and J 4 is connected to connector J 3 on the 861 board if you have a multi-
user sys tem.
The cable signals and connections for connecting data terminal equipment to the
971 are shown below.
This connection is made via the I/O panel on the back of
the machine.
971
Signal
RS-232C
Jl or J2
DTE Connector
Name
Circuit
Pin
Pin
Transmi t Data
BA
3
------
2
Recei. ve 0 ata
BB
5
3
Request to Send
CA
7
------
4
"-
Clear to Send
CB
9
------
5
Data Set Ready
CC
11
------
6
Signal Ground
AB
13
------
7
Data Terminal Ready
CD
14
------
20
Data Carrier Detect
CF
15
------
8
Ring Indicator
CE
18
------
2
Model 971 Serial Port to RS-232C Connector Cable
IMS International
5000 Series Microcomputers/7.01.83;Page 21
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