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