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Download of older Harddisk Interface Descriptions
Floppy Disk Drive 34 Pin Connector
| Pin |
Signal |
| 2 |
LDENSEL# |
| 4 |
Microfloppy |
| 6 |
EDENSEL |
| 8 |
INDX# |
| 10 |
MTEN1# |
| 12 |
DRSEL0# |
| 14 |
DRSEL1# |
| 16 |
DTEN0# |
| 18 |
DIR# |
| 20 |
STP# |
| 22 |
WRDATA# |
| 24 |
WREN# |
| 26 |
TRK0# |
| 28 |
WRPRDT# |
| 30 |
RDDATA# |
| 32 |
HDSEL1# |
| 34 |
DSKCHG# |
All odd numbered pins are connected to ground (GND)
Simplified drawing, view upon:
34 pin printed circuit board connector
(5,25" drives)
34 2
-----------------
-----------------
33 1
34 PIN connector (3,5" drives)
1 33
ooooooooooooooooo
ooooooooooooooooo
2 34
The printed circuit board connector and the connector of the 3,5" drives
are mounted on the opposite side at the older type of universal cable sets. The cable has
to be twisted between the 5,25" and 3,5" drives. Pin 1 is usually marked red at the cable.
IDE - Bus / AT - Bus
| IDE Signal |
Pin |
Function |
AT-Signal |
Signal Direction |
| RESET |
1 |
Reset drives |
RESET DRV 1) |
Host->Drive |
| GND |
2 |
Ground |
-- |
-- |
| DD7 |
3 |
Data bus 7 |
SD7 |
bi-directional |
| DD8 |
4 |
Data bus 8 |
SD8 |
bi-directional |
| DD6 |
5 |
Data bus 6 |
SD6 |
bi-directional |
| DD9 |
6 |
Data bus 9 |
SD9 |
bi-directional |
| DD5 |
7 |
Data bus 5 |
SD5 |
bi-directional |
| DD10 |
8 |
Data bus 10 |
SD10 |
bi-directional |
| DD4 |
9 |
Data bus 4 |
SD4 |
bi-directional |
| DD11 |
10 |
Data bus 11 |
SD11 |
bi-directional |
| DD3 |
11 |
Data bus 3 |
SD3 |
bi-directional |
| DD12 |
12 |
Data bus 12 |
SD12 |
bi-directional |
| DD2 |
13 |
Data bus 2 |
SD2 |
bi-directional |
| DD13 |
14 |
Data bus 13 |
SD13 |
bi-directional |
| DD1 |
15 |
Data bus 1 |
SD1 |
bi-directional |
| DD14 |
16 |
Data bus 14 |
SD14 |
bi-directional |
| DD0 |
17 |
Data bus 0 |
SD0 |
bi-directional |
| DD15 |
18 |
Data bus 15 |
SD15 |
bi-directional |
| GND |
19 |
Ground |
-- |
-- |
| 2) |
20 |
Mark for Pin 20 |
-- |
-- |
| DMARQ 3) |
21 |
DMA
Request |
DRQx |
Drive->Host |
| GND |
22 |
Ground |
-- |
-- |
| DIOW |
23 |
Write data via I/O-channel |
IOW |
Host->Drive |
| GND |
24 |
Ground |
-- |
-- |
| DIOR |
25 |
Read data via I/O-channel |
IOR |
Host->Drive |
| GND |
26 |
Ground |
-- |
-- |
| IORDY 3) |
27 |
I/O-access done (ready) |
IOCHRDY |
Drive->Host |
| SPSYNC |
28 |
Spindle synchronization |
-- |
Drive->Drive |
| DMACK 3) |
29 |
DMA Acknowledge |
DACKx |
Host->Drive |
| GND |
30 |
Ground |
-- |
-- |
| INTRQ |
31 |
Interrupt Request |
IRQx |
Drive->Host |
| IOCS16 |
32 |
16-Bit-Transfer via I/O-channel |
I/OCS16 |
Drive->Host |
| DA1 |
33 |
Address bus 1 |
SA1 |
Host->Drive |
| PDIAG |
34 |
Passed Diagnostic from Slave |
-- |
Laufw.->Laufw. |
| DA0 |
35 |
Address bus 0 |
SA0 |
Host->Drive |
| DA2 |
36 |
Address bus 2 |
SA2 |
Host->Drive |
| CS1Fx |
37 |
Chip Select for basisadr. 1f0h |
-- |
Host->Drive |
| CS3Fx |
38 |
Chip Select for basisadr. 3f0h |
-- |
Host->Drive |
| DASP |
39 |
Drive Active/Slave Present |
-- |
Drive->Host |
| GND |
40 |
Ground |
-- |
-- |
1) inverted signal of the AT bus signal
2) pin closed, to prevent a wrong
plugging of the connector
3) optional
Simplified drawing, view upon:
40 Pin IDE Cable
39 1
o o o o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o o o
40 2
At some cables pin 20 is coded i.e. closed to prevent a wrong placement of the cable.
Pin 1 is marked by a color (red). At the 44 pin notebook cables the signal assignment is the same as shown for the 40 pin cables.
Simplified drawing, view upon:
44 Pin cable for 2,5" Drives (hard disk in notebooks)
43 1 K C A
o o o o o o o o o o o o o o o o o o o E o o
o o o o o o o o o o o o o o o o o o o Y o o
44 2 D B
At the 44 pin notebook cables
the signals have the same assignment as for the 40 pin cables. The 44
pin cable is physically a 50 pin cable. 2 pins were removed to match the divider in the socket.
Pins A-D are not used.
Further information you find at Seagate at: ftp://ftp.seagate.com/techsuppt/misc/pin-cabl.txt
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