DESCRIPTION OF PIN FUNCTIONS
PIN NO.
12
11
13
9
10
18
5,6
7,4
16
15
14
3,2
19,20
Write Gate
Write Disk Data
Head Select (1 = side 0)
Step Direction (1 = out)
Step Pulse
Disk Change
Drive Select Lines
Motor On Lines
Write Protected
Track 0
Index Pulse Input
Drive Density Select [1:0]
Media ID inputs. In floppy enhanced mode 2 these
inputs are the media ID [1:0] inputs.
(Note 4)
SERIAL PORT 1 INTERFACE
145
146
148
149
150
147
152
151
155
156
158
159
160
157
Receive Serial Data 1
Transmit Serial Data 1
Request to Send 1
Clear to Send 1
Data Terminal Ready 1
Data Set Ready 1
Data Carrier Detect 1
Ring Indicator 1
SERIAL PORT 2 INTERFACE
Receive Serial Data 2 (Note 4)
Transmit Serial Data 2 (Note 4)
Request to Send 2 (Note 4)
Clear to Send 2 (Note 4)
Data Terminal Ready 2 (Note 4)
Data Set Ready 2 (Note 4)
RXD2
TXD2
nRTS2
nCTS2
nDTR2
nDSR2
I
O4
O4
I
O4
I
RXD1
TXD1
nRTS1
nCTS1
nDTR1
nDSR1
nDCD1
nRI1
I
O4
O4
I
O4
I
I
I
NAME
SYMBOL
nWGATE
nWDATA
nHDSEL
nDIR
nSTEP
nDSKCHG
nDS[1:0]
nMTR[1:0]
nWPROT
nTR0
nINDEX
DRVDEN
[1:0]
MID[1:0]
BUFFER
TYPE
OD48
OD48
OD48
OD48
OD48
IS
OD48
OD48
IS
IS
IS
OD48
IS
7
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