Intellec MDS questions

Thu Apr 7 19:36:58 CDT 2005

> 
> I recently purchased an MDS 800 without a disk drive.  It does have a =
> controller and cable to the backplane for a disk drive.  Do you have a =
> schematic for the PCB and a wiring diagram of the PCB to backplane =
> cable.  I have some old SA801 drives and a power supply that I could =
> use.

I've got the double-density diskette system schematics here... I think 
the drive cabinet may well be the same for the single density one too.

OK, there are basically 4 parts to the cabling : 

1) Controller board top edge connectors to DC37 sockets on the back of the 
MDS800

2) DC37 plug to 50 pin Blue Ribbon plug cable (MDS to drive box external 
cable)

3) 50 pin blue ribbon socket to 2 50 pin header sockets ribbon cable 
(drive box internal cable)

4) The little PCB on the back of the drive.

Number 3 is a straight-through IDC cable. Here's some info on the others...

1 : 

Edge connector (double sided 50 pin) ---- DC 37 sockets (J8 == drives 0,1 ; 
J9 == drives 2,3)

A21 ----- J8/1     INDEX 01/
B21 ------J8/20 
A12 ----- J8/2     READY 1/
B12 ----- J8/21
A15 ----- J8/3     READY 0/
B15 ----- J8/22
A10 ----- J8/4     WPROT 01/
B10 ----- J8/23
A5  ----- J8/5     WRT DAT 01/
B5  ----- J8/24
A16 ----- J8/6     FILE INOP 01/ 
B16 ----- J8/25
A19 ----- J8/7      TRACK 00 -01/
B19 ----- J8/26
A3  ----- J8/8      DIR 01/
B3  ----- J8/27
A30 ----- J8/9      INOP RESET 01/
B30 ----- J8/28
A1  ----- J8/11      STEP 01/
B1  ----- J8/30
A7  ----- J8/12      WRT GT 01/
B7  ----- J8/31
A24 ----- J8/13      DRV SEL 1/
B24 ----- J8/32
A27 ----- J8/14      LED 0/
B27 ----- J8/33
A18 ----- J8/15      READ DATA 01/
B18 ----- J8/34 
A33 ----- J8/16      LED 1/
B33 ----- J8/35
A23 ----- J8/17      DRV SEL 0/
B23 ----- J8/36
A28 ----- J8/18      TRACK >43 -01/
B28 ----- J8/37

A20 ----- J9/1      |NDEX 23/
B20 ------J9/20 
A11 ----- J9/2      READY 3/
B11 ----- J9/21
A13 ----- J9/3      READY 2/
B13 ----- J9/22
A9  ----- J9/4      WPROT 23/
B9  ----- J9/23
A6  ----- J9/5      WRT DAT 23
B6  ----- J9/24
A17 ----- J9/6      FILE INOP 23/
B17 ----- J9/25
A22 ----- J9/7      TRACK 00-23/
B22 ----- J9/26
A4  ----- J9/8      DIR 23/
B4  ----- J9/27
A31 ----- J9/9      INOP RESET 23/
B31 ----- J9/28
A2  ----- J9/11     STEP 23/
B2  ----- J9/30
A8  ----- J9/12     WRT GT 23/
B8  ----- J9/31
A26 ----- J9/13     DRV SEL 3/
B26 ----- J9/32
A32 ----- J9/14     LED 2/
B32 ----- J9/33
A14 ----- J9/15     READ DATA 23
B14 ----- J9/34
A34 ----- J9/16     LED 3/ 
B34 ----- J9/35
A25 ----- J9/17     DRV SEL 2 /
B25 ----- J9/36
A29 ----- J9/18      TRACK > 43 - 23/
B29 ----- J9/37

All B-side pins ground.

2 :

DC37    50 pin Blue RIbbon
1       8    INDEX /
20      7
2       30   READY 1/
21      29
3       28   READY 0/
22      27
4       36   WPROT/
23      35
5       18   WRT DATA/
24      17
6       44   FILE INOP/
25      43
7       6    TRACK 00/
26      5
8       14   DIR/
27      13 
9       46   INOP RESET/
28      45
11      12   STEP/
30      11
12      16   WRT GT/
31      15
13      22  DRV SEL 1/
32      21
14      47  LED 0/
33      48
15      2   READ DATA/
34      1
16      49  LED 1/
35      50
17      20  DRV SEL 0/
36      19
18      10  TRACK > 43/
37      9

4 : PCB On back of drive : 
All odd pins (both conenctors grounded

Cable     Drive 
2         46  READ DATA/
4 N/C
6         42  TTACK 00/
8         20  INDEX/
10        16  TRACK > 43/
12        36  STEP/
14        34  DIR/
16        40  WRT GT/
18        38  WRT DATA/
20 or 22  26 and 28 DRV SEL (cable pin jumper-selected)
24 N/C
26 N/C
28 or 30   28  READY (cable pin jumper-selected)
32 N/C
34 N/C
36         44  WPROT/
38         48  READ DATA SEP/ (Single density systems only?)
40 N/C
42         50  READ CLK SEP/ (Single Density systems only?)
44 N/C
46 N/C
48 N/C
50 N/C

Hope that helps...

-tony