Kaypro 2 - 16-10.TIFF

16.4 I/O PeRl' ~
'The port addresses belo.v apply to KAYPRO 2/83 and 4/83 eat1puters.
Port #
00
04
05
06
08
lC
Use and/or Assignment
Baud Rate (write only) - Writing a number between 0 and F hex
(see baud rate table) to this port sets the RS-232C baud
rate.
RS-232C serial D3.ta (R/W) - D3.ta register of the Z-80 SIo.
Re fer to Zilog/Mostek Microcomputer Data 1:xx:>ks fur further
in fonnation.
KeybJard D3.ta (R/W) - Eight-bit data from detachable
keylxlard.
RS-232C Status (R/W) - ContrOl/status port fur the Z-80 SIo.
Re fer to Zilog/Mostek Microcomputer Data 1:xx:>ks fur further
infunnation.
Printer Port (write only) - Eight-bit data to parallel
printer connector.
System Port (R/W) - This port is used fur system control.
The various bits are used fur memory bank selection, disk
drive control, and printer handshaking.
The serial output is an 8-bit word with one start, one stop, and no parity.
Examples:
*
Received character available is obtained by testing bit 0 of the status
port. O1aracter is available if this bit is high (a 1 rather than 0).
* Transmit Buffer Empty is obtained by testing bit 2 of the status port.
Buffer is empty when bit 2 is high (I).
Manuals on the Z-80 CPU, Z-80 PIa, Z-80 SIO are available from the ZILffi
sales office nearest to you. Western Digital can sell you a copy of the
manual fur the Floppy Disk Controller. Re fer to Re ference section fur
vendors I mailing addresses and phone numbers.
When ordering manuals fur any of the chips mentioned above, remove the h<X>d
from the computer and write down the full model number that is on the top
sur face 0 f the chip. 'This is the best way to be certain 0 f getting the
proper manual from either of the manufacturers listed above.
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