
PC-HDD/LG User’s Guide
7PC-HDD/LG
Connector Pin Assignment
Pin Signal Function I/O Pin Signal Function I/O
1 RESET- Bus Reset I 2 GND Signal Ground
3 DB7 Data Bus Bit 7 I/O 4 DB8 Data Bus Bit 8 I/O
5 DB6 Data Bus Bit 6 I/O 6 DB9 Data Bus Bit 9 I/O
7 DB5 Data Bus Bit 5 I/O 8 DB10 Data Bus Bit 10 I/O
9 DB4 Data Bus Bit 4 I/O 10 DB11 Data Bus Bit 11 I/O
11 DB3 Data Bus Bit 3 I/O 12 DB12 Data Bus Bit 12 I/O
13 DB2 Data Bus Bit 2 I/O 14 DB13 Data Bus Bit 13 I/O
15 DB1 Data Bus Bit 1 I/O 16 DB14 Data Bus Bit 14 I/O
17 DB0 Data Bus Bit 0 I/O 18 DB15 Data Bus Bit 15 I/O
19 GND Signal Ground I/O 20 KEY Key Pin
21 Open 22 GND Signal Ground
23 IOW- Host I/O Write I 24 GND Signal Ground
25 IOR- Host I/O Read I 26 GND Signal Ground
27 IORDY I/O ch RDY O 28 Reserved
29 Reserved 30 GND Signal Ground
31 INTRQ Interrupt Request O 32 IOCS16- Drive 16 Bit I/O O
33 ADD1 Host Address 1 I 34 PDIAG- Passed Diagnostic I/O
35 ADD0 Host Address 0 I 36 ADD2 Host Address 2 I
37 CSO- Chip Select 0 I 38 CS1- Chip Select 1 I
39 DASP- Active (LED) O 40 GND +5V Return
41 +5V +5VDC 42 +5V +5VDC
43 GND +5V Return 44 Reserved
Drive Characteristics (Logical Drive Format)
Description Logical
Head
Number
Logical
Sector
/Track
Logical
Cylinder
Number
Logical
Sector
Size
Number
of
Sectors
Total
logical data
Bytes
PC-HDD/LG 16 63 16,383 512 39,070,080 20,003,880,960
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