This is a post of a message from the Usenet newsgroup, comp.sys.atari.st about
installing TOS 2.06 in a 1040ST without the TEC board.  It seemed to work for
the author of this post, but there are no guarantees when 'hacking' your
computer...

 - - - - - - - - - - - - - - - post follows - - - - - - - - - - - - - - - - - -

Well, thanks to everyone who replied to me about where to shove and where to
get TOS 2.06 I have gotten it to work in my 1040ST without a TEC.  The solution
requires 10 wires from the GLUE chip, 3 TTL devices (<$1) and 5 pins of each
ROM lifted.  The circuit I used is shown below:

TOS 2.06 Address Decoder and DTACK Generator:

  (19,XX)  ROM2_>--------------------------+          +--------+-----+--------+
                                           |          | Chip   | +5V | Ground |
                         74F138            |          +--------+-----+--------+
                    +--------------+       |          | 74F138 | 16  |   8    |
  (11,52)    A23>---|a0(1)   q0(15)|o-     |          | 74F08  | 14  |   7    |
  (10,51)    A22>---|a1(2)   q1(14)|o-     |          | 74F06  | 14  |   7    |
  (09,50)    A21>---|a2(3)   q2(13)|o-     |    74F08 +--------+-----+--------+
                    |        q3(12)|o-     |  _______
  (12,06)    AS_>--o|e1(4)   q4(11)|o-     |  \      \
  (08,48)    A20>--o|e2(5)   q5(10)|o-     +--o\a(1)  \
  (55,09)   R/W_>---|e3(6)    q6(9)|o-          )  y(3))o--------> CE_
                    |         q7(7)|o---*-----o/b(2)  /
                    +--------------+    |     /______/
                                        |
                              +5V       |
                              _|_       |
                     330 Ohm  | |       |
                              | |       |
                              |_|       |
                      4   /| 3 |  2 /|1 |   74F06 (Must be open collector)
  (50,10) DTACK_<-------o< |---*---< |o-+
                          \|        \|


                         +5V  74F08
                          |  ____
                          +--|4  \
                             |  6 )-------------------------->BA17
  (05,45)    A17>------------|5__/

                         +5V  74F08
                          |  ____
                          +--|9  \
                             |  8 )-------------------------->BA16
  (04,44)    A16>------------|10_/


  Note:  Numbers in parenthesis on the left are (GLUE pin,68000 pin).
         Parts needed are:

                1 74F138
                1 74F08
                1 74F06

         Different families (LS, ALS, AS) may be substituted for the above
         parts.  The buffer that drives DTACK_ must be open collector or if
         a 7406 part can't be found a tri-state buffer can be used as long
         as it is used like the example below:

                          74LS244
                        +-------------+
                        |        oe(1)|o-------- to pin 7 of 74F138
       DTACK_<----------|y0(18)  i0(2)|---+
                        |             |   |
                        +-------------+   |
                                          |
                                       GROUND


I have been working on a document that explains in detail how I installed
TOS 2.06 (the mechanics is the main deal).  When I finish it, I would like
to place it in the archive but I don't know how.  Could some one please tell 
me how to submit a text file.  Also, if anyone would like a copy of the 
current document just send me email and I'll send you what I have.


				Bye
					Ted Rossin