TRS80 help needed - test-drb@ccmp.vtda.org

23 Aug 2001

On Aug 23,  7:23, Pete Turnbull wrote:
...
  On Aug 22, 17:24, Don Maslin wrote: 
...
   Pete, were
those the ones that also had a `touch latch' door on them?
 Some of the Otrona Attache's used such drives, but I had no idea that
 they were 40/80 switchable!  Do you have any jumper information for
 them? 
 They actually made two or three models, so yours may not be switchable.  I
...
  do have the jumper information somewhere, and I'll
look for it this
 evening. 
Mine is a Canon MDD220.  Yes, it's a "touch-latch" door.  It has three DIL
switch packs:

SW1, 4-way, beside the 34-way connector:

SW1-1  on for DS1
SW1-2  on for DS2
SW1-3  on for DS3
SW1-4  on for DS4 (40/80-track switching)

SW2, 7-way, near the front of the drive:

SW2-1  InUse LED with Head Load
SW2-2  InUse LED with Door Lock
SW2-3  Door Lock with Drive Select
SW2-4  Door Lock with InUse
SW2-5  Door Lock with Head Load
SW2-6  unused
SW2-7  Head Load with DrvSel/DoorClosed

SW3, 6-way, beside the 34-way connector:

SW3-1  Independant Head Load
SW3-2  Head Load with Drive Select
SW3-3  Motor On with Drive Select
SW3-4  Independant Motor On
SW3-5  80/40-track (Drive Select 4)
SW3-6  80/40-track switching via Drive Select

SW3-5 = ON means that 40/80 mode is determined by the position of SW1-4,
not by the select signal received from the host:

SW3-5 ON, SW3-6 ON, SW1-4 OFF => 40=track mode, LED will be GREEN
SW3-5 ON, SW3-6 ON, SW1-4 ON  => 80=track mode, LED will be RED

There are also 7 pads near the power connector, laid out like this:
         ___
        |   \     7   1
        |    }    6   2
        |    }    5   3
        |    }    4
        |    }
        |___/

Normally, these are made 1-6, 2-5, 3-4.  To use the 80/40-track switching,
cut link 1-6.

The MDD210 drive is similar but without switching (80-track only).
The MDD6106 is also similar but without switching (I think 40-track only).

-- 
Pete						Peter Turnbull
						Network Manager
						University of York