Page MSI-P563 User Manual
Table 3. 82C55A connector J1 pin-outs.
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Pin No. Port / Bit Pin No. Port / Bit
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1
A / 0
27
B / 5
3
A / 1
29
B / 6
5
A / 2
31
B / 7
7
A / 3
33
C / 0
9
A / 4
35
C / 1
11
A / 5
37
C / 2
13
A / 6
39
C / 3
15
A / 7
41
C / 4
17
B / 0
43
C / 5
19
B / 1
45
C / 6
21
B / 2
49
C / 7
23
B / 3
25
B / 4
2-48
Ground
50
+5V
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C. 16550 Serial Port
The 16550 (U5) provides a serial I/O port that is selectable as for
RS-232C, RS-422 or RS-485 protocols. The 16550 is compatible
with the UART used in the IBM PC. The interrupt output for the
device (denoted as UARTINT, see schematic diagram in
Appendix) is available at JP8-2 for routing to the appropriate
interrupt of the PC/104 bus, as described in Section E below.
Data sheets describing the 14550 are available on the internet
at
www.natsemi.com/pf/PC/PC16550D.html
1. RS-232C Selection
The required jumpers for RS-232C operation are given in
6
