SERIAL PORT ASSIGNMENTS
For Modem (serial channel A):
PORT 4 is the Z-80 SIO data port. PORT 6 is the
Z-80 SlO control and status port.
Received character available is obtained by testing bit 0 of the status port;
Transmit Buffer Empty is obtained by testing bit 2 of the status port. Other
details can be found in the Z-80 documentation available from Zilog.
The serial output is an 8-bit word with one start, one stop, and no parity.
Baud Rate Table
HEX #
Baud Rate
0
50
1
75
2
110
3
134.5
4
150
5
300
Note: The default baud rate
6
600
will be 300 baud when the
7
1200
KAYPRO is first turned on or
8
1800
when the reset button is
9
2000
pressed unless you change
A
2400
it with the CON FIG program on
B
3600
the CP/M S-BASIC diskette.
C
4800
D
7200
E
9600
F
19200
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