DESCRIPTION OF PIN FUNCTIONS
NAME SYMBOL
PIN NO.
11
BUFFER TYPE
Write Disk Data
nWDATA
nHDSEL
nDIR
OD48
OD48
OD48
OD48
IS
13
Head Select (1 = side 0)
Step Direction (1 = out)
Step Pulse
9
10
nSTEP
18
Disk Change
nDSKCHG
nDS[1:0]
nMTR[1:0]
nWPROT
nTR0
5,6
7,4
16
Drive Select Lines
Motor On Lines
OD48
OD48
IS
Write Protected
15
Track 0
IS
14
Index Pulse Input
Drive Density Select [1:0]
nINDEX
IS
3,2
19,20
DRVDEN [1:0]
MID[1:0]
OD48
IS
Media ID inputs. In floppy enhanced mode 2 these
inputs are the media ID [1:0] inputs. (Note 4)
SERIAL PORT 1 INTERFACE
Receive Serial Data 1
145
146
148
149
150
147
152
151
RXD1
TXD1
I
Transmit Serial Data 1
O4
Request to Send 1
nRTS1
nCTS1
nDTR1
nDSR1
nDCD1
nRI1
O4
Clear to Send 1
I
Data Terminal Ready 1
O4
Data Set Ready 1
I
I
I
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)
Data Carrier Detect 2 (Note 4)
Ring Indicator 2 (Note 4)
155
156
158
159
160
157
154
153
RXD2
TXD2
I
O4
nRTS2
nCTS2
nDTR2
nDSR2
nDCD2
nRI2
O4
I
O4
I
I
I
6
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