DESCRIPTION OF PIN FUNCTIONS
PIN
No./
QFP
BUFFER
TYPE
PER
BUFFER
TYPE
NAME
TOTAL
SYMBOL
NOTES
FUNCTION
(NOTE 1)
73
74
75
77
78
79
80
81
82
83
Port Data 5
1
1
1
1
1
1
1
1
1
1
PD5
PD6
PD7
SLCT
PE
BUSY
nACK
nERROR
nALF
IOP14
IOP14
IOP14
IO12
I
I
I
I
IOP14
IOP14
IOP14
I/OD12
I
I
I
I
Port Data 6
Port Data 7
Printer Selected Status
Paper End
Busy
Acknowledge
Error
Autofeed Output
Strobe Output
OP14
OP14
(OD14/OP14)
(OD14/OP14)
nSTROBE
KEYBOARD/MOUSE INTERFACE (6)
56
57
58
59
63
Keyboard Data
Keyboard Clock
Mouse Data
1
1
1
1
1
KDAT
KCLK
MDAT
MCLK
GP36/
nKBDRST
IOD16
IOD16
IOD16
IOD16
IO8
IOD16
IOD16
IOD16
IOD16
(I/O8/OD8)/
O8
Mouse Clock
General Purpose I/O
/Keyboard Reset
General Purpose I/O
/Gate A20
9
64
1
GP37/A20M
IO8
(I/O8/OD8)/
O8
9
GENERAL PURPOSE I/O (19)
32
33
34
35
36
37
38
39
41
42
General Purpose I/O
/Joystick 1 Button 1
General Purpose I/O
/Joystick 1 Button 2
General Purpose I/O
/Joystick 2 Button 1
General Purpose I/O
/Joystick 2 Button 2
General Purpose I/O
/Joystick 1 X-Axis
General Purpose I/O
/Joystick 1 Y-Axis
General Purpose I/O
/Joystick 2 X-Axis
General Purpose I/O
/Joystick 2 Y-Axis
1
1
1
1
1
1
1
1
1
1
GP10/J1B1
GP11/J1B2
GP12/J2B1
GP13/J2B2
GP14/J1X
GP15/J1Y
GP16/J2X
GP17/J2Y
GP20/P17
IS/O8
IS/O8
IS/O8
IS/O8
IO12
IO12
IO12
IO12
IO8
(IS/O8/OD8)/
IS
(IS/O8/OD8)/
IS
(IS/O8/OD8)/
IS
(IS/O8/OD8)/
IS
(I/O12/ OD12)/
IO12
(I/O12/ OD12)/
IO12
(I/O12/
OD12)/IO12
(I/O12/
OD12)/IO12
(I/O8/OD8)/
IO8
(I/O12/OD12)/
IO12/(O12/
OD12)
General Purpose I/O /
P17
General Purpose I/O /
P16 /nDS1
GP21 /P16/
nDS1
IO12
43
General Purpose I/O /
P12/nMTR1
1
GP22 /P12/
nMTR1
IO12
(I/O12/
OD12)/IO12/
(O12/OD12)
45
46
General Purpose I/O /
System Option
General Purpose I/O
/MIDI_IN
1
1
GP24
/SYSOPT
GP25
/MIDI_IN
IO8
IO8
(I/O8/OD8)
8
(I/O8/OD8)/I
Page 8
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