[Coco] MAME FDC Issue that can cause corruption

[David Ladd]

Francis,

Copying files between drive 0 and drive 1

Accessing programs from both drive 0 and drive 1

Technically this is how I found the problem to start with is when I was in
OS-9 L2 which I had in drive 0 working on stuff and I had VDG term open and
I went to drive 1 to start a game of Cave Walker and when it started load
the binaries and data files from drive 1 while other files were being
accessed.

So right there are real world reasons to be accessing two drives at once.

If it wasn't for me doing something real world I wouldn't have found the
problem to start with.

And as far as doing this on a real CoCo I hate to say this but again I was
doing this all the time.

Every CoCo user is unique to how they used their CoCo. Some people only
played games. Others ran BBS off of the CoCo which in deed could and would
access all the floppy drives. Then there is development where OS-9 and
development tools are in drive 0 and source files on drive 1 and doing a
build of your project which would cause programs to be loaded and unloaded
off of drive 0 while scratch files are created and worked with on drive 1
while source files also being read from drive 1 at same time.

There are people who are indeed using the real CoCo for real development
right now.

I myself have used EDTASM+ in drive 0 and my source disk in drive 1.

So there is my list of real world reasons to do it on real CoCo and MAME.

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| David Ladd a.k.a. PacoOtaktay a.k.a. Drencor                          |
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On Wed, Aug 2, 2017 at 6:17 AM, Francis Swygert <farna at att.net> wrote:

> So the problem is when you try to access two drives simultaneously, or
> real quickly one after the other? Simultaneously shouldn't be a big issue
> -- you wouldn't do that on a real CoCo, why would you on an emulator? If
> the issue is accessing one then the other, such as in copying from one to
> another, then I can see this as being a problem at times. Even then most
> won't see the bug, as you would rarely (if ever) copy from one emulated
> floppy to another. Maybe from the emulated hard drive to the
> floppy... Frank Swygert
>  Fix-It-Frank Handyman Service
>  803-604-6548
>
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