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Article #42 (75 is last):
From: vparada@inf.utfsm.cl (Victor Parada G.)
Newsgroups: freenet.sci.comp.atari.prog.8bit.resource
Subject: Dummy Cartridge for Atari 800 [16k]
Posted-By: xx004 (aa853 - Craig Lisowski)
Edited-By: xx004 (aa853 - Craig Lisowski)
Date: Sun Sep 18 03:20:36 1994

Hola mundo.

Chad N.R. Knudson  wrote:
>Schematic for Dummy Cartridge
>This modification tricks the computer into thinking a cartridge is
>installed.  [...]

The following does the same for a dummy 16K cartridge.  A friend of
mine gave me this home made cart.  Since I'm not an IEEE member,
I just can describe it:

  ROM                                          ROM    PROCESSOR
PRESENT   GROUND                      +5V    PRESENT     R/W
   A        B        SN74LS04N         13      14         R
   |        |        ---------          |       |         |
   |        +------+|8       7|-   +----+       |         |
   |        |      -|9       6|-   |    |       |         |
   |        |      -|10      5|-   |    |       |         |
   |        |      -|11      4|-   |    |       |         |
   |        |      -|12      3|-   |    A resis |         |
   |        |  +---+|13      2|-   |    H tence |         |
   |        |  | +-+|14  _   1|+---+    V       |         |
   |        |  | |   ---- ----          |       |         |
   |        |  | +----------------------)-------)---------+
   |        |  |                        |       |
   |        |  +----o/o-----------------)-------+
   |        +-------o/o-------------++--+       |
   |           double-switch    LED ()          |
   |                                            |
   +--------------------------------------------+

Codes for the resistence:  orange/orange/purple/gold  (? ohm)

I'm not sure about the number of the pins in the LS, because I can't
remember if the chip is in the front or the back of the card.
If I'm wrong, I'll correct it...

The names in the cartridge port are from "Mapping the Atari".

Bye...   ++V
-- 
:           | / . -/-         vparada@inf.utfsm.cl         Victor Parada G.
:   -/- -/- |/ /  / () ( ()   vparada@loa.disca.utfsm.cl  Informatica UTFSM


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