The number coming from the POT controller is eight bits and the number sent to the TV speaker is four bits. This program has therefore packed two input voltages into a single byte in the RAM buffer. Other compression techniques such as compression of like characters and Hamming Codes would have to be implemented if this method of generating speech were to be fully implemented. By setting the proper switch this program has used audio channel number one in this mode. This in no way affects what is happening in the other three voices.
X can be a number from zero to fifteen.
Each different X sent to this address causes the TV speaker cone to be moved in or out. This is exactly what our program does with its digitized input. This technique is quite inexpensive and gives one a taste of the machine, its capabilities and limitations. It is fairly easy to implement and the results are reasonably satisfactory.