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- From: rossin@hpfcso.FC.HP.COM (Ted Rossin)
- Date: Mon, 4 Jan 1993 16:51:33 GMT
- Subject: TOS 2.06 +$1 works in 1040ST
- Message-ID: <7340114@hpfcso.FC.HP.COM>
- Organization: Hewlett-Packard, Fort Collins, CO, USA
- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!hpscit.sc.hp.com!hplextra!hpfcso!rossin
- Newsgroups: comp.sys.atari.st
- Lines: 75
-
- 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
-