Printer Interface - NEC PC-8201 Service Manual

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 6 9
BIT 7
-
BIT
0 Printer data port
7 6 5 4 3 2 1 0
*
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