[Coco] HDB-DOS build fixes. Untested as of yet.

[Bill Pierce]

Charlie,
In playing around with lower level dw cmds while working on my dw manager, I crash the Coco and the emulator quite often. The screen you describe is exactly what I see on most crashes. This happens on the real Coco as well as VCC so it's definately software generated and not hardware. It seems to happen most when my data structures get out of hand and overwrite the $ff00-$ffff area. If the HDBDOS code is situated the same as it is for the Coco3 1.4 version, the DW read and write routines are very near the end of ram/rom. First check and make sure the code is compiling at the right size. There is no room for extra code there. I'm pretty sure Robert Gault or David Ladd can give you the max size that it can compile to. Also, if the routines are over-writing the code, then there's a good possibility it's running right past it into the $FFxx regs.

Just a thought.. 
Bill P

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Bill Pierce
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-----Original Message-----
From: Charlie Pelosi <chazbeenhad at hotmail.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Sun, Dec 30, 2012 2:50 pm
Subject: Re: [Coco] HDB-DOS build fixes. Untested as of yet.


Gene, I have no doubt! But I only see the lines with the bad rom during DW i/o.


Sent from my Windows Phone
________________________________
From: Gene Heskett<mailto:gheskett at wdtv.com>
Sent: ‎12/‎30/‎2012 2:24 PM
To: coco at maltedmedia.com<mailto:coco at maltedmedia.com>
Subject: Re: [Coco] HDB-DOS build fixes. Untested as of yet.

On Sunday 30 December 2012 14:20:58 Daniel Campos did opine:

> Em 30/12/2012 14:51, Charlie Pelosi escreveu:
> > And older version of the rom 1.1D works fine, so the config is good.
> >
> >
> >
> > I do notice something hard to describe. When the coco 1 tries to do
> > I/O through DW the screen gets these very subtle verticle lines that
> > jump all over, almost like interference.....

Its quite likely that the electrolytic capacitors on your coco's board are
dried out and suffering from high ESR.  After nearly 30 years, its to be
expected.   That is today, 90% of the capacitor failures I have found over
the last 20 years.

> >
> > Charlie
>
> Hi Charlie,
>
> Do you know where I can get this older 1.1D ROM package ?
> Never saw the Color64 working with Drivewire and would like to test
> that.
>
> Thanks!
>
> Daniel
>
>
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Cheers, Gene
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