Vector Graphic Bitstreamer II User Manual - page 11
Purpose
Multiple serial
and parallel
input/ouput.
Compatibility
S-1~0 systems.
serial
channels
3, using 8251 controller
chips.
Channel addresses
x2 and x3, x4 and x5, x6 and x7 where x is any digit
o
to 7.
Prewired x is 0.
(Each serial
channel uses
two I/O addresses.)
Signal levels
EIA RS-232C,or 201Mcurrent
loop on one channel only.
RS-232handshaking
Lines 5, 6, and 8 are held high.
Other handshaking lines are not connected•
.Jumperpads are provided to connect than.
There is one spare recevier and one spare driver for
handshaking lines on board that can be connected by
jumper.
'!here are two spare slots
if rooreare needed.
Can be wired for internal
or external
gynch.
8251 SYNDET
line is not connected.
Not nowconnected to the external ~rld
as required
for synchronous operation.
Single or double synch character
can be programmedfor
each channel independently.