IR Transmitter/Receiver module

I hacked an old satellite receiver and removed the IR receiver module and the
remote control's IR LED assembly and built a simple interface for the 6522.
The receiver has 3 pins, Gnd, +5VDC, and the Output, which goes low when a modulated
IR signal is received. This eliminates the decoding of the 45KHz IR transmitter.

The IR transmitter works by toggling the IR LED using software to work out the timing
issues.

Here's a simple diagram:

        IR RCVR
    _____ _____
   |     U     |
   |___________|
     1  2    4
     |  |    |                              
     |  |    \---------O 6522 B5 (pin 15)   
     |  |      
     |  o +5vdc
    _|_                                                       
     -                                                       
    gnd        
    
        IR XMTR

    ____n____
   |         |
   |_________|
     1  2  3
     |  |  |                              
     |  |  \---------O 6522 B4 (pin 14)   
     |  |      
     |  o +5vdc
    _|_                                                       
     -                                                       
    gnd        
    

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There are two source files supporting the IR TX/RX hardware. One runs the
Transmitter section and the other the receiver section. These two routines
have been written with very accurate cycle counting in order to ensure
compatibility. Be careful if you decide to modify them.

Both source files are available in the "Download" tab.