DTR-1 Floppy Drive Connector Pinout
From morris.shaw@support.comSun Jan 21 16:09:48 1996
Date: Fri, 19 Jan 96 18:53:55 -0800
From: morris.shaw@support.com
To: toby@eskimo.com
Subject: DTR-1 IDE/Floppy
I've seen 3 different sets of signal names but pin number is the same.
The correct Drive Select at *your* floppy may depend on design or jumper.
#HRESET 1 2 *GND # - IDE pin assignments
#XT7 3 4 #AT8 (#) - pin assignment at IDE device
#XT6 5 6 #AT9 but not at HDD/FDD port
#XT5 7 8 #AT10 * - Shared pins (same assignment)
#XT4 9 10 #AT11 % - Floppy pin assignments:
#XT3 11 12 #AT12 signal std(34) mini(26)
#XT2 13 14 #AT13 IND 8 2
#XT1 15 16 #AT14 DS 10/12 4
#XT0 17 18 #AT15 MOT 16 10
*GND 19 20 (#not used)%IND DIR 18 12
(#DRQ?)%DS 21 22 (#GND)%MOT STP 20 14
#IOW 23 24 (#GND)%DIR WD 22 16
#IOR 25 26 (#GND)%STP WG 24 18
#IORDY 27 28 (#CSEL?)%WD TK0 26 20
(#DAK?)%WG 29 30 (#GND)%TK0 WP 28 22
#IRQ14 31 32 #IOCS16 RD 30 24
#ADR1 33 34 #PDIAG SIS 32 26
#ADR0 35 36 #ADR2 RDY 34 6
#CS0 37 38 #CS1 HD 2 9
#DASP 39 40 *GND GND all odd 15-25,odd
@+5Vdc 41 42 @+5Vdc +5V separate 1-5,odd
*GND 43 44 @+12Vdc @ - used to power floppy & laptop
%WP 45 46 %RD style HDD w/o separate power
%SIS 47 48 %RDY connector(44 pin,usually 2mm)
(%HD) 49 50 @+12V
Some surplus store in the Chicago probably has a box full of the cables
and can't figure out what they're for because they are too sloppy for
SCSI ports.
The CD-ROM drive ran all right without 21, 28, or 29 connected, albeit
in I/O Port mode, so I'm still unsure whether DMA uses the shared pins.
One is not going to find ready made cables, the market's too small.
Many electronics and computer stores do have standard SCSI-2 to mini
SCSI-2 cables, as well as external SCSI cases which would fit a CD-ROM
and/or floppy drive with the final connections inside the case, but the
shell at the Dauphin will have to be "stretched."
It is left entirely to conjecture as to the technical competence of any-
one foolish enough to try these procedures. I am not responsible for any
damages incurred.
morris
And a second pinout...
Subj: Re: DTR1
Date: 95-12-17 12:15:38 EST
From: DauphinTim
To: PDC ChrisD
Sent on: America Online (using WAOL 2.5)
Pinouts for DTR-1 HDD/Floppy Port
This port contains both a full IDE connector and a full floppy disk
connector. There is some functional overlap between the two and
some pins are shared. However, the only thing keeping both from
being attached via a single connector is that doing so generates
too much line noise. They they begin to interfere with one
another.
Remember, external hard drives connected through this port are
Drive D on the same controller as the internal HDD (drive C).
Floppy drives are drive A.
Top Row (Right to Left)
1 Reset -
3 XT Bus Data Bit 7
5 XT Bus Data Bit 6
7 XT Bus Data Bit 5
9 XT Bus Data Bit 4
11 XT Bus Data Bit 3
13 XT Bus Data Bit 2
15 XT Bus Data Bit 1
17 XT Bus Data Bit 0
19 Ground
21 Drive Select 0 -
23 I/O Write -
25 I/O Read -
27 I/O CH Ready
29 Write Gate -
31 IRQ 14
33 PC Address Bit 1
35 PC Address Bit 0
37 (Hard Drive) Chip Select 0 -
39 Hard Drive LED
41 5 volt source
43 Ground
45 Write Protect -
47 (Floppy) Head Select
49 (Floppy) Density Select
Bottom Row (Right to Left)
2 Ground
4 AT Bus Data Bit 8
6 AT Bus Data Bit 9
8 AT Bus Data Bit 10
10 AT Bus Data Bit 11
12 AT Bus Data Bit 12
14 AT Bus Data Bit 13
16 AT Bus Data Bit 14
18 AT Bus Data Bit 15
20 (Floppy) Index -
22 (Floppy) Motor Select 0 -
24 (Floppy) Direction -
26 Step -
28 (Floppy) Write Data -
30 (Floppy) Track 0 -
32 I/O Chip Select, 16 bit -
34 P Diag -
36 PC Address Bit 2
38 Chip Select 1 -
40 Ground
42 5 volt source
46 Ext. Disk Drive Power
48 Read Data -
50 Disk Change -
52 Ext. Disk Drive Power