A hard drive interface that has seen better times. Another replacement for SCSI that eventually became IDE. ESDI and IDE suck. If not for them, SCSI would be a lot cheaper. Instead, we're stuck with an inferior interface that only supports&two drives and can't even drive both of them at the same time.

Enhanced Small Device Interface. Disk drive interface introduced in the late 1980s that never really caught on. Had separate Cables for control and data, unlike SCSI and IDE, which use one cable for both. It came after IDE, and is not related to it.

Control cable pinout:

1
GND
Ground
2
SH3
Select Head 3
3
GND
Ground
4
SH2
Select Head 2
5
GND
Ground
6
W
Write Gate
7
GND
Ground
8
CON
Configuration Data
9
GND
Ground
10
TACK
Transfer Acknowledge
11
GND
Ground
12
AT
Attention
13
GND
Ground
14
SH0
Select Head 0
15
GND
Ground
16
FOUND
Sector Found
17
GND
Ground
18
SH1
Select Head 1
19
GND
Ground
20
INDEX
Index
21
GND
Ground
22
READY
Ready
23
GND
Ground
24
TRQ
Transfer Request
25
GND
Ground
26
SD1
Select Drive 1
27
GND
Ground
28
SD2
Select Drive 2
29
GND
Ground
30
SD3
Select Drive 3
31
GND
Ground
32
R
Read gate
33
GND
Ground
34
CD
Command Data


Data Connector:

1
DS
Drive Selected
2
FOUND
Sector Found
3
DONE
Seek Complete
4
AME
Address Mark Enable
5
N/A
Reserved
6
GND
Ground
7
WC+
Write Clock +
8
WC-
Write Clock -
9
CC
Cartridge Changed
10
RRC+
Read Ref Clock +
11
RRC-
Read Ref Clock -
12
GND
Ground
13
NW+
NRZ Write data +
14
NW-
NRZ Write Data -
15
GND
Ground
16
GND
Ground
17
NR+
NRZ Read data +
18
NR-
NRZ Read data -
19
GND
Ground
20
GND
Ground

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