Re: I/O of the 41CV Message #2 Posted by John Ioannidis on 24 Feb 2002, 4:48 p.m., in response to message #1 by Robin Heim
Yes, but with a lot of effort.
First, you would have to build circuitry to interface the bit-serial i/o ports to whatever it is you are building.
If you want to control things from a user-level program without also writing your own machine-code functions, you could build a circuit that looks like a memory module mapped into some of the unused address space. Of course, said module would actually have to behave the same way as memory would, and since this process normalizes numbers, you would basically be limited to 48-bit i/o instructions that look like alpha data. You would still need to use synthetics to move the curtain so you could access your memory-mapped devices.
Look at old issues of the PPC Journal, and some work that I have done interfacing to the PIC in http://www.tla.org/hp41/, in particular the mldl.html and pic.html pages in that directory.
What are you trying to do anyway?
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