Table 2-2
Interface
Input/Output
Lines
Signal Name
Term
~
Sig,nal
Relurn
Remarks
Pin
Pin
Inputs
UNIT SELECT
NO.1
IUS1R
942
841
UNIT SELECT
NO.2
IUS2R
1.42
1.41
UNIT SELECT NO, 3 IUS3R
B43
B44
UNIT SELECT
NO.4
IUS4R
1.43
1.44
PLA TTER SELECT
IPSXR
827
B26
MEAD SELECT IMSXR
1.27
1.26
CYLINDER ADDRESS STROBE
ICASR
B33
B32
CYLINDER
DEMAND ADDRESS 0
ICOOR
1.39
1.38
LS8
CYLINDER DEMAND ADDRESS I ICD1R
B39 838
CYLINDER DEMAND ADDRESS 2
ICD2R
1.37
1.38
CYLINDER DEMAND ADDRESS 3
ICOlR
837 B38
CYLINDER DEMAND
ADDRESS 4 ICD4R
1.36 1.35
CYLINDER DEMAND ADDRESS 5
ICD5R
B36
B35
CYLINDER DEMAND ADDRESS 6
ICDSR
1.34
1.35
CYLINDER
DEMAND ADDRESS 7 ICD7R
B34
B35
MSB 100
tpi
CYLINDER DEMAND ADDRESS EXTENSION ICDER
A33
A32
MSB200
toi
RESTORE INITIAL CYLINDER
IRICR
1.31
A32
WRITE
ENABLE IWEXR
B22
B23
ERASE ENABLE IEEXR
A22 1.23
WRITE DATA
SIGNAL
IWDSR
1.28
1.29
READ ENABLE IREXR
B24 B23
TRACK
OFFSET PLUS ITOPR
825 826
TRACK OFFSET MINUS ITOMR
1.25
A26
ACTIVATE
EMERGENCY UNLOAD IAEUR
B31
B32
START I STOP DISK DRIVE ISSDR
B30
829
TOlallnput
LInes
::
25
Outputs
READY IRXXD
Bl
B2
BUSY SEEKING
NO.1
IBS1D
819
820
BUSY SEEKING
NO.2
IBS2D A19 1.20
BUSY SEEKING
NO.3
IBS3D
B21
B20
BUSY SEEKING
NO.4
IBS4D
1.21
A20
SECTOR PULSE
ISPXD
A4
A5
SECTOR
COUNT
0
IScaD
A15
A14
LoS8
SECTOR COUNT 1 ISC1D 815
814
SECTOR COUNT 2
ISC20
A13
1.14
SECTOR COUNT
3 ISC3D
813
B14
SECTOR COUNT
4 ISC4D
A12
All
SECTOR COUNT 5 ISC50 B12
Bl1
SECTOR COUNT 6
ISesD
1.10
All
MSB
INDEX PULSE IIPXD B4
85
READ CLOCK IRCXD B16 B17
READ DATA
tROXD
A16
1.17
ILLEGAL CYLINDER ADDRESS IICAO
B3
B2
FILE PROTECTED
IFPXD
Al
1.2
MALFUNCTION
DETECTED
IMDXD
B6 B5
DUAL
PLATTER DRiVe IOPDD B7
B8
DOUBLE TRACK DRIVE
IDTDD
A7
A8
(Special Interface
Signall
A3 A2
Termination Voltage A45
B45
Tolal
Output
Lines =
23
2-9
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