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DESCRIPTION OF PIN FUNCTIONS
PIN
No./QFP
NAME
TOTAL
SYMBOL
BUFFER
TYPE
7,41,
60,76
Ground
VSS
FDD INTERFACE (16)
16
Read Disk Data
1
nRDATA
IS
11
Write Gate
1
nWGATE
O24/OD24
10
Write Disk Data
1
nWDATA
O24/OD24
12
Head Select
1
nHDSEL
O24/OD24
8
Step Direction
1
nDIR
O24/OD24
9
Step Pulse
1
nSTEP
O24/OD24
17
Disk Change
1
nDSKCHG
IS
5
Drive Select 0
1
nDS0
O24/OD24
4
Drive Select 1
1
nDS1
O24/OD24
3
Motor On 0
1
nMTR0
O24/OD24
6
Motor On 1
1
nMTR1
O24/OD24
15
Write Protected
1
nWRTPRT
IS
14
Track 0
1
nTRKO
IS
13
Index Pulse Input
1
nINDEX
IS
1
Drive Density Select 0
1
DRVDEN0
O24/OD24
2
Drive Density Select 1/IR Mode
Select/IRRX3
1
DRVDEN1/
IRMODE/
IRRX3
O24/OD24/
O24/I
SERIAL PORT 1 INTERFACE (8)
84
Receive Serial Data 1
1
RXD1
I
85
Transmit Serial Data 1
1
TXD1
O4
87
Request to Send 1
1
nRTS1/
SYSOP
O4/I
88
Clear to Send 1
1
nCTS1
I
89
Data Terminal Ready 1
1
nDTR1
O4
86
Data Set Ready 1
1
nDSR1
I
91
Data Carrier Detect 1
1
nDCD1
I
90
Ring Indicator 1
1
nRI1
I
SERIAL PORT 2 INTERFACE (8)
95
Receive Serial Data 2/Infrared Rx
1
RXD2/IRRX
I
96
Transmit Serial Data 2/Infrared Tx
1
TXD2/IRTX
O24