NEC PC-8201 - Printer Interface

3.1.5 Printer Interface
The printer interface is an
&bit parallel interface (Centronics compatible).
The following
shows the printer interface port.
Data is transmitted to Port
A at 81~55-and control signal
from printer is transmitted to Port
C.
*
* Data transfer to printer
OUT 69
BIT 7 - BIT 0
Printer data port
765 432 10
*
BUSY. SLCT signal from printer
PD7
SLCT
I
BUSY
0
1
PD6
BUSY
* Strobe printer
PDZ
SLCT
Deselect
Select
PD5
I
Printer READY
Printer BUSY
PDI
OUT 90
PDO
PD4
5
PSTB
PD3
PSTB STROBE PRINTER
0 Strobe Off
1 Strobe On