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Port B
Receive and Transmit Baud Clock Selections GBl
Location
J
B defines the source of port B's receive and transmit clocks.
The normal
connect is etched and shown below.
JB
1
0--0
6
2
0
0
5
3
0
0
4
RxTxCB- from Z-80A
erc
T1 (1bis connection is etched)
RxTxCB- from RS-232 Interface pin 17 (Signal DO -
Receive dock)
RxTxCB- from RS-232 Interface pin 15 (Signal DB - Transmit Clock)
S-1 00 Reset Pis able (Location
TO)
A shunt in this location disables the RESET signal going to the 8255 chip.
This location
1S
only shunted during testing; normally it is unshunted.
IMS International
5000 Series Microcomputers/7.01.83;Page 63
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