> On Jun 13, 2020, at 2:01 AM, Stephen Buck <stephenb...@mac.com> wrote:
>
> Hi, I’m interested in having a go at writing a simulator for the RCA CDP1802
> processor. There is quite a bit of renewed interest in this unique processor
> and the systems that made use of it, like the Cosmac Elf and a variety of
> different spacecraft. It had some very unique features, such as the ability
> to use any register as the program counter. The 1802 had a few successors
> that added features and a family of peripheral processors. It was used as the
> basis of commercial products as well as home-brew systems.
>
> I’m looking for a good place to start. If you were starting a new simulator
> for a simple but unique chip which other simulator would you use as a SIMH
> learning tool? Which simulator structure would best match the variety of
> systems is was used in?
SIMH is a framework for writing system simulators. Its particular strength is
that it helps write not just the CPU but also the I/O device emulations, and
lets you connect them in flexible ways.
If all you want is to simulate a microprocessor, SIMH is probably more than you
need (though it should certainly work). But if you want to recreate some 1802
based systems, especially if more than one, it's probably a good choice. The
documentation is decent and there are a number of existing machine emulations
you can use as references. If there's anything in SIMH you're already familiar
with, that's a good starting point. For example, in my case I looked a lot at
the PDP11 emulation.
paul
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