RE: [midatlanticretro] Re: RCA COSMAC Microkit
- When I get back from a brief vacation I will look up the commands from their
HEX values, and/or convert to an Intel record that would be easier to
assemble. I believe I have the instruction set in my
vintagecomputer.net/RCA/COSMAC directory, or elsewhere. If assembly is
possible. No way to know about whether inversion is necessary yet.
[mailto:email@example.com] On Behalf Of joshbensadon
Sent: Thursday, April 18, 2013 1:39 PM
Subject: [midatlanticretro] Re: RCA COSMAC Microkit
--- In firstname.lastname@example.org, "B. Degnan" <billdeg@...> wrote:
> > In this case, if you had an inverted bus, it would make sense to
> > store
> the ROM as inverted so you didn't have to put another buffer chip on
> the bus. If you're trying to disassemble it, just run it through a
> program to flip the bits.
> -Thanks Dave-
I don't think Bill has determined that the bus is inverted.
I observed the dump that Bill posted didn't make sense as 1802 machine code
until I guessed that the bits might be inverted.
I am only guessing that the bus is inverted and wish to advise Bill to look
out for that.
I could be totally out to lunch, since it is an 1801 chip set.
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