The Museum of HP Calculators
HP Forum Archive 06
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|PIC-based MLDL (well, just the ROM emulator part)|
Message #1 Posted by John Ioannidis on 12 July 2001, 2:49 p.m.
I just got the PIC-based rom emulator done. It consists of a PIC 18C252 processor running at 40MHz and an EPSON SG-8002DC-PWT programmable oscillator (programmed for 40MHz).
The code is very straightforward, just bit-banging everything in and out of the serial buses. It needs some trimming, and also figuring out how to make it play nice with the calculator in standby/poweroff modes (I can't have the thing drawing 50mA when the calculator is off!), but that shouldn't be hard.
Look in [http://www.tla.org/hp41/mldl.html] for pretty pictures. I'll be putting the code there when I'm ready to release it.
|Re: PIC-based MLDL (well, just the ROM emulator part)|
Message #2 Posted by Dane on 12 July 2001, 11:50 p.m.,
in response to message #1 by John Ioannidis
Cool!!! I can't wait for further details! Wish I could lend a hand but I'm a Mechanical Engineer, but I would love to be able to store my own programs on a module. How much will you have invested in this?
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