PIN
No./QFP
12
8
9
17
5
6
3
4
15
14
13
1
2
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
112
113
115
116
117
114
119
118
123
TOTAL
Head Select
1
Step Direction
1
Step Pulse
1
Disk Change
1
Drive Select 0
1
Drive Select 1/GP17
1
Motor On 0
1
Motor On 1/GP16
1
Write Protected
1
Track 0
1
Index Pulse Input
1
Drive Density Select 0
1
Drive Density Select 1/GP52/IRQ8/nSMI
1
GENERAL PURPOSE I/O (6)
General Purpose 10/nSMI
1
General Purpose 11/nRING/EETI (Note 4)
1
General Purpose 12/WDT/P17/P12/EETI
1
(Note 4)
General Purpose 13/LED Driver
1
General Purpose 14/Infrared Rx
1
General Purpose 15/Infrared Tx (Note 3)
1
BIOS INTERFACE (10)
ROM Bus 0/IRQ1/GP60/nSMI
1
ROM Bus 1/IRQ3/GP61/LED
1
ROM Bus 2/IRQ4/GP62/nRING
1
ROM Bus 3/IRQ5/GP63/WDT
1
ROM Bus 4/IRQ6/GP64/P17/P12
1
ROM Bus 5/IRQ7/GP65
1
ROM Bus 6/IRQ8/GP66
1
ROM Bus 7/IRQ10/GP67
1
nROMCS/IRQ11/GP53/EETI (Note 4)
1
nROMOE/IRQ12/GP54/EETI (Note 4)
1
SERIAL PORT 1 INTERFACE (8)
Receive Serial Data 1
1
Transmit Serial Data 1
1
Request to Send 1
1
Clear to Send 1
Data Terminal Ready 1
Data Set Ready 1
Data Carrier Detect 1
Ring Indicator 1
1
1
1
1
1
SERIAL PORT 2 INTERFACE (8)
Receive Serial Data 2/Infrared Rx
1
8
NAME
SYMBOL
nHDSEL
nDIR
nSTEP
nDSKCHG
nDS0
nDS1
nMTR0
nMTR1
nWRTPRT
nTRKO
nINDEX
DRVDEN0
DRVDEN1
GP10
GP11
GP12
GP13
GP14
GP15
RD0
RD1
RD2
RD3
RD4
RD5
RD6
RD7
nROMCS
nROMOE
RXD1
TXD1
nRTS1/
SYSOP
nCTS1
nDTR1
nDSR1
nDCD1
nRI1
RXD2/IRRX
BUFFER TYPE
O24
O24
O24
IS
O24
IO24
O24
IO24
IS
IS
IS
O24
IO24
IO12
IO4
IO4
IO24
IO4
IO24
IO12
IO24
IO12
IO12
IO12
IO12
IO12
IO12
IO12
IO12
I
O4
IO4
I
O4
I
I
I
I
SMSC [ SMSC CORPORATION ]
