Epson PC AX Technical Manual page 199

REV.A
OSTB
SLN
INI
ATF
STB
BSY
ACK
EOP
SLP
ERR
IRQ
OIRE
ACKP
SCSN
DDIR
o
I
I
I
I
I
I
I
I
I
O&II-Z
o
o
o
o
45
38
40
44
46
34
33
35
36
37
15
3
2
53
64
DIAGRAMS AN» REFERENCE MATERIALS
(-) Printer data strobe pulse.
(-) Printer select.
(-) Printer initialize.
(-) Auto feed.
(-) Printer data strobe pulse.
(+)
Printer busy.
(-) Acknowledge.
(+)
End of paper.
(+)
Printer select.
(-) Printer error.
(+)
Interrupt request. IRQ becomes active, when
-ACK signal becomes low and interrupt request is
enabled.
(-) Interrupt request enable.
(+)
Acknowledge.
(-) Chip select signal of serial port.
(-) Direction control of data buffer. This
signal is active while serial port or parallel
port are being read.
*
Legend:
I
o
Tri
0&11-2
Input P in
Output P in
Tri-state Pin (Input, Output,
=
Output
&
High-impedance Pin
High-impedance)
7-25