Re: Examining the Monitor?

[mjmahon@aol.com (Michael J. Mahon)]

Ernest wrote:

>Is it possible to examine the code in the ROMs and find out what the various
>control key functions are? Would that kind of information be in the Monitor?
>The controlling key functions are well documented for the Apple II computer
>but I have several clones, like the Havoc for example, that none of the
>normal key commands work on. Is there a way to find out what those commands
>would be without having a User Manual to look them up in?

If you can find the command to display a range of memory addresses
in hex, that's a start.  If you can find the command (L on the Apple)
to disassemble memory, that's even better.

You will have to disassemble and "reverse-engineer" enough of the
monitor to find its command decoding so that you can document it.

Just displaying the address range of the monitor in ASCII may turn
up a table of commands, though it may not be compact, and if they
are single-letter commands, it may not be easy to find.

Another starting point is to assume (!) that the monitor for an Apple
clone is similar to, or derived from, the Apple monitor, and using the
Apple monitor source as a guide to the ROM, look for any changes.
(If it is _much_ different, that should be obvious.)

-michael

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