SimonSoft's IDE-hardware for ATARI-computers.

Chapter 2A, IDE-Interface in a cartridge.

THIS INTERFACE USES PORT $D500.

Parts needed:
-------------
One IDE Flatcable (Cut one end off)
One 74LS04 (NOT)
One 74LS32 (OR)
One ATARI XE-Cartridge to scrap
Some wires and a handy friend :-)

IDE Flatcable to cartridge connection:
--------------------------------------
40 pins flatcable layout    Connect to atari cartridge
(1 is marked red/black)     (see below)

1  pull up (4.7KOhm)     ->   13
2  ground                ->   B
3  D7                    ->   M
4  ground                ->   B
5  D6                    ->   11
6  ground                ->   B
7  D5                    ->   7
8  ground                ->   B
9  D4                    ->   6
10 ground                ->   B
11 D3                    ->   L
12 ground                ->   B
13 D2                    ->   8
14 ground                ->   B
15 D1                    ->   9
16 ground                ->   B
17 D0                    ->   10
18 ground                ->   B
19 ground                ->   B
20 not connected
21 not connected
22 ground                ->   B
23 IOwrite               (see chips)
24 ground                ->   B
25 IOread                (see chips)
26 ground                ->   B
27 not connected
28 not connected
29 not connected
30 ground                ->   B
31 not connected
32 not connected
33 A1                    ->   4
34 not connected
35 A0                    ->   5
36 A2                    ->   3
37 IOadress              ->   15
38 pull up (4.7KOhm)     ->   13
39 not connected
40 ground                ->   B

Atari cartridge connector:
Back              15 14 13 12 11 10 9  8  7  6  5  4  3  2  1
		  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
		  +++++++++++++++++++++++++++++++++++++++++++
		  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Front (keyboard)  S  R  P  N  M  L  K  J  H  F  E  D  C  B  A

Other usefull signal:
R/W    : R
IOnr5  : 15
O2     : S
5 Volt : 13
Ground : B

Chips:
------
The numbers are the pinnumbers of the corresponding chip.
Each chip has pin 7 connected to ground
Each chip had pin 14 connected to the 5 Volt supply

R/W--------------------1(OR)3----->IOwrite
                         2
                         |
O2--1(NOT)2--------------+
                         |
 			 5
R/W-3(NOT)4----------- 4(OR)6----->IOread

(Version-1b, Edited 25-06-2000 By Mr. Atari. No warranty)