Re: 2001N/basic-4 UD3 option

From: Bo Zimmerman <bo_at_zimmers.net>
Date: Tue, 10 Oct 2017 12:47:51 -0500
Message-ID: <56b39b2e-ed2f-4de8-43ee-a9f827d516a4@zimmers.net>
I gave it a shot, and my best guess is some sort of basic extension.  I 
see several calls to $0070, and lots of calls to random places in the 
basic roms (I can't be more specific than that).  Also, the code blocks 
are very disconnected, meaning there's not a lot of cross-linking 
between the bits of code, which suggests that most of the little 
routines are being called into from outside of the rom block.

There are 0 calls to the traditional kernal i/o routines.  No jsr 
$ffcf/e4/d2.  One call to $ffcc, and one to $ffc9, but no idea what .x 
is at that point.

Anyway, this was my very first time trying to do something like this 
with a rom, so I'm certain someone else could do better, but that's my 
guess.

- Bo

On 10/10/2017 4:48 AM, Francesco Messineo wrote:
> Did anyone try to disassemble this dump? I have to give back the 4032
> as it's repaired now and I would like to suggest the owner what might
> be this option ROM.
>
> On Fri, Oct 6, 2017 at 7:02 AM, Francesco Messineo
> <francesco.messineo@gmail.com> wrote:


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Received on 2017-10-10 19:00:04

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