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2.6.2
MOPEL 631 I/O CONTROLLER BOARD
GENERAL pESCRIPTION
The Model 631 I/O Controller has two asynchronous serial ports and three 8-bit
parallel ports.
The 8250 Asynchronous Communication Element (ACE) converts input serial data
from the RS-232C port to parallel data to be used by the system.
Output data
is converted from parallel to serial and placed on the RS-Z32C port.
The 8255 Programmable Peripheral Interface circuit interfaces the S-100 bus to
three 8-bit parallel ports, which are located at
13,
the 50 pin I/O connector at
the top of the card.
Each line is TIL buffered and provides for termination
networks.
The Model 631 I/O Controller consists of a single printed circuit board which
nominally occupies one slot in the Series 5000 or 8000 Computer Systems.
Each
serial RS -23ZC port is brought out to a 3M 26 pin header.
CONFIGURING THE 631 BOARP
110 Address Selection (Location
1M
The mos t significant bits of the I/O addresses for the 631 board are selected at
location JA.
An address bit is a "1" if the shunt is removed, and a "0" if a
shunt is installed.
The correspondence of shunts to address bits is shown below.
The normal address is ZOH (AS unshunted, A6 and A7 shunted).
JA
A7 1
0 - - 0
6
A6 2
c.-----o
5
AS 3
0
0
4
I/O Device Address Table
"----
SERIAL
SERIAL
PARALLEL
I/O Address(hex)
6L
M-
Al.
PORT 0
PORT 1
PORTS
00-13
0
a
0
00-07
08-0F
10-13
20-33
0
0
1
20-27
28-ZF
30-33
40-53
0
1
0
40-47
48-4F
50-53
60-73
0
1
1
60-67
68-6F
70-73
80-93
1
0
0
80-87
88-8F
90-93
AO-B3
1
0
1
AO-A7
A8-AF
BO-B3
CO-03
1
1
0
CO-C7
C8-CF
00-03
EO-F3
1
1
1
EO-E7
E8-EF
FO-F3
IMS International
5000 Series Microcomputers/7.01.83/page 49
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