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Topic       : Documentation of the CT60
Author      : Didier MEQUIGNON
Version     : Version 2.00 (December 11, 2010)
Subject     : Documentation
Nodes       : 135
Index Size  : 3664
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
@lang       : 
@default    : 
@help       : 
@options    : -i
@width      : 75
View Ref-File5.3.13  Printer and Joystick Ports                                CT60

P0 Printer port error. Data read from the printer port was not what was
   written.
P1 Busy interrupt error. The input to the MFP is not being read, or the
   STROBE output from the PSG is not functioning, or Joystick 0 pin 3 not
   connected.
J0 Joystick Port 0. The keyboard input is not functioning.
J1 Joystick Port 1. The keyboard input is not functioning.
J2 Joystick time-out. Joystick inputs were simulated by outputting data on
   the printer port and routing it via the test fixture to the joystick
   ports. Joysticks inputs are detected by the keyboard and sent to the CPU
   via the 6850. This error can be caused by printer port failure (code
   P0), keyboard failure, or keyboard-CPU communication line.
J3 Left button input. Not seen by the test keyboard.
J4 Right button input. Not seen by the test keyboard.
J5 Aux Joystick Direction. Game controller port (J500, J501) direction
   bits. U511 is used to drive the input via test fixture. The hexadecimal
   data following corresponds to bits read from latches U510 and U512,
   where a one indicates an error. For example, 0002 indicates and erreur
   at J500 pin 3.
J6 Aux Fire Button. Fire buttons are read from U509. Signal is driven via
   the test fixture from the output of U511.
J7 Paddle. The inputs are driven by either 5V/100 ohms or 5V/1M on the
   test fixture. This current charges the RC network on the FALCON030,
   varying the output pulse of the LM556.
J8 Light gun. The light gun (XPEN) input is toggled at three points on the
   screen (the video address counter is used to find the position of the
   screen). The COMBEL should return the X/Y coordinates of the screen
   position.