Re: CBM DOS 1.0 / CBM 2040, 3040 with 670 blk free

From: André Fachat (
Date: 2000-03-07 12:59:20

Ethan Dicks wrote:

> How about the 6530?  Here's what I have for DOS 1 (originals)

I don't emulate the FDC side of the drive. Instead I monitor certain
memory locations and do the stuff in C.

As I can read the DOS version/error message at least partially I assume
that starting up works, and the bug is somewhere else (reading the error
message should not involve the FDC)
[In fact, only startup and format use custom code that gets loaded
into the FDC RAM and executed there, and of course some bad programs.
The rest uses the standard FDC commands that are easily emulated.
This way we save a third CPU to be emulated...)

> > - Anyone with a working 2040/3040 that would be willing to read out
> >   the (possibly different) ROMs and upload them to funet?
> My 2040 drives all have V2 of CBM DOS.  My V1 chips all came out of the
> spare parts bin of the local Commodore dealer when I bought his service
> department as scrap almost ten years ago.  I could see about reading these
> in, but I suspect that they are identical to what's on funet.

It might be a good idea to have a double check on the ROMs, but then I
I should first try again to make them work and see where the error is.

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