I/O PORT ADDRESSES
Port #
Use and/or assignment
00H
Baud rate. (Write only)
Writing a number between 0 and F to this port will set the RS-232C
baud rate.
04H
RS-232C Serial Data. (R/W)
Data register of the Z
-
80 SIO
05H
Keyboard Data. (R/W)
Eight-bit data from detachable keyboard. See the following S-BASIC
program for an example of writing to this port.
06H
RS-232C Status. (R/W)
Control/status port for the Z
-
80 SIO. See Zilog and Mostek Microcom-
puter Data Books.
08H
Printer Port. (Write only)
Eight-bit data to parallel printer connector
1CH
System Port. (R/W)
This port is used for system control. The various bits are used for
memory bank selection, disk drive control, and printer handshaking.
5
o
To Next Page
Loading...
