greg@ccwf.cc.utexas.edu (Greg Harp) (02/10/91)
I have a project I'm working on where I want to sample a TTL-level signal
and convert it to binary numbers for storage. I would then need to be able
to output a similar signal.
I basically need some recommendations on the best wat to do this. I only
need a 1-bit input and output (I can use the same line since I will only
be doing one at a time). Can I make the fire button pin of port 1 into
an output? I remember being able to specify specific lines on my C64's
I/O port (run by the 6526) as inputs or outputs by setting a register.
I'd prefer to use the joystick port since I don't want to have to switch
the printer or modem in or out.
The data I need to be able to transmit and recieve is at about 2kHz or
less, so I expect to be sampling at around 10-20kHz since the length of each
pulse is important. This may require me to directly access the hardware
(something I personally dislike in programming) so I was wondering if
there was an OS-friendly way to do this.
Also, I could use some suggestions on the best way to time the sampling.
Don't some audio samplers use Paula for timing?
I really haven't done much Amiga-specific programming except for intuition
and graphics dallying, so I could use some help. Oh yeah, before you
recommend buying the Hardware Reference Manual, I already have plans to do
so.
TIA,
Greg
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