Table of Contents
Advertisement
2.10
MODEL 662 VIDEO DISPLAY BOARD
The 662 Video Display Board is used in the IMS 5000IS.
It receives data from
the keyboard and transmits it to the processor.
It also controls the CRT, with
the ability to emulate four current CRT terminals.
It has an RS-232 serial port
and an RS-422 port.
SPEC IF ICAT ION S
Processor:
ROM Capaci ty:
ROM Type:
RAM Capaci ty:
RAM Type:
Keyboard Interface:
Moni tor I nterf ace:
Screen F orxr.at:
Power Requirements:
Operating Environment
8085 microprocessor
8 Kbytes
2732 or equivalent EP ROM
8 Kbytes
6116 2K x 8 static RA.\is
Asynchronous, TTL level serial input, 50-9600 baud,
+5V mark bit, sync bit, 8 data bits and 1 stop bit.
Single line active high output for controlling bdl on
keyboard.
TTL level interface signals with either active-high or
active-low sync signals available.
Horizontal sweep
rate is 19.4KHz at 60Hz and 18KHz at 50Hz.
Video
bandwidth should be >20MHz.
24 lines (plus status line) by 80 columns, 7 x 8
characters with 2 descenders in a 9 x 12 matrix.
+ 5 volts
@
800ma
+12 volts
@
30ma
-12 volts
@
ZOma
0-55 deg. C.
CONFIGURING THE 662 BOARD
RS-232/RS-422 Mode Selection (TA)
Shunt
J
A indicates whether RS -23 2 or RS -422 protocol is being used.
RS -422
is used when the 662 board is used in a terminal which is far away from the
computer.
In a 500015 system, this location always has the upper pair shunted.
JA
1
T
20
3
0
RS-23ZC -- shunt 1-2
RS -422 -- shunt 2- 3
IMS International
5000 Series Microcomputers/7.01.83/page 83
Advertisement
Table of Contents
