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Port A
Receive and Transmit Baud Clock Selection GAl
The shunts at location IA indicate the source of the Receive and Transmit clocks for the
serial ports.
Normally, pins 1 and 16 are shunted, pins 3 and 14 are shunted, and pins 6
and 11 are shunted together.
JA
10
016
20
015
30
014
40
013
50
012
60
011
70
010
80
0
9
RxDA from RS-232
(Signal
BB - Receive Data)
R xDA from RS -
4
22
(S i g n a
1
RD - R
e
c e i v e D a t a)
RxCA-
from Z-80A
erc
TO
RxCA-
from RS-232
(Signal DD - Receive Clock)
RxCA-
from RS-422
(Signal
RT - Receive Timing)
TxCA-
from Z-80A
erc
TO
TxCA-
from RS-232
(Signal DB - Transmit Clock)
T x CA -
from Z - 8
a
A
er
C T 0 / 2
Port B
Receive Clock Selections
(J
B)
The shunt at IB indicates the source of the 'receive' clock for port B.
t\ormally, plnS 1
and
4
are shunted.
JB
10
04
20
03
RxDB from RS-232
(Signal
BB -
Receive Data)
RxDB from RS-422
(Signal RD - Receive Data)
Reset Disable (Location
To>
A shunt at location ID disables the RESET signal to the 861 board.
JD
1S
only shunted
during testing; normally there is no shunt.
JO
10
Normal mode -
shunt
off.
20
Local
861
test mode
-
shunt
on.
IMS International
5000 Series Microcomputers/7.01.83/page 68
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