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Re: Input/output on the Apple ][

sam124@operamail.com wrote:

I would like to do single character output using data stored in the
6502's accumulator.  I would also like to do single character input,
with and without echoing.


Next question:  Output to what?  connected how?  (serial? parallel?...)
                Input from what?  etc., etc.

Generally, you do character I/O by calling a "driver" which
manipulates registers, handshakes, etc. to accomplish the
task.  But what you are talking to and how it's connected
are crucial to the answer.

If you are talking about the built-in text display, or the
keyboard, then the firmware to control the operation is already
provided in ROM.

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