home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Crawly Crypt Collection 1
/
crawlyvol1.bin
/
program
/
hard_prj
/
tos206in
/
tos206in.txt
Wrap
Text File
|
1993-01-27
|
4KB
|
83 lines
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