DESCRIPTION OF PIN FUNCTIONS
PIN
No./QFP
7,41,
60,76
18
BUFFER TYPE
PER FUNCTION
(NOTE 1)
NAME
Ground
+5 Volt Standby Supply
Voltage (Note 7)
Read Disk Data
Write Gate
Write Disk Data
Head Select
Step Direction
Step Pulse
Disk Change
Drive Select 0
Motor On 0
Write Protected
Track 0
Index Pulse Input
Drive Density Select 0
Drive Density Select 1
TOTAL
SYMBOL
VSS
VTR
16
11
10
12
8
9
17
5
3
15
14
13
1
2
84
85
87
88
89
86
91
90
95
96
98
FDD INTERFACE (14)
1
nRDATA
1
nWGATE
1
nWDATA
1
nHDSEL
1
nDIR
1
nSTEP
1
nDSKCHG
1
nDS0
1
nMTR0
1
nWRTPRT
1
nTRKO
1
nINDEX
1
DRVDEN0
1
DRVDEN1
IS
(O24/OD24)
(O24/OD24)
(O24/OD24)
(O24/OD24)
(O24/OD24)
IS
(O24/OD24)
(O24/OD24)
IS
IS
IS
(O24/OD24)
(O24/OD24)
I
O4
O4/I
I
O4
I
I
I
I/I
O24PD/ O24PD
O4/I
SERIAL PORT 1 INTERFACE (8)
Receive Serial Data 1
1
RXD1
Transmit Serial Data 1
1
TXD1
Request to Send 1/System
1
nRTS1/
Option (Note 6)
SYSOPT
Clear to Send 1
1
nCTS1
Data Terminal Ready 1
1
nDTR1
Data Set Ready 1
1
nDSR1
Data Carrier Detect 1
1
nDCD1
Ring Indicator 1
1
nRI1
SERIAL PORT 2 INTERFACE (8)
Receive Serial Data 2/Infrared
1
RXD2/IRRX
Rx
Transmit Serial Data 2/Infrared
1
TXD2/IRTX
Tx (Note 4)
Request to Send 2/Sys Addr 12
1
nRTS2/
SA12
7
SMSC [ SMSC CORPORATION ]
