[Coco] MAME FDC Issue that can cause corruption

[Barry Nelson]

I was also able to reproduce this with the DIR commands on separate lines when I was able to type in the second DIR fast enough. When I have time I will try to build 0.188 (or later) and see if the issue persists. This may take some time. There were no special disk images needed to reproduce this issue, I created two blank JVC images and formatted them as described below.

> On Aug 1, 2017, at 4:30 AM, Barry Nelson <barry.nelson at amobiledevice.com> wrote:
> 
> I have confirmed this issue on my Macintosh build of MAME as of version 0.186 and later. David, have you filed a bug report?
> 
>> David Ladd davidwladd at gmail.com  <mailto:coco%40maltedmedia.com?Subject=Re%3A%20%5BCoco%5D%20%5BCOCO%5D%20MAME%20FDC%20Issue%20that%20can%20cause%20corruption&In-Reply-To=%3CCAHW2jkD0ehDiQ7H--G5TxgskT4X3pWxnUuy-XEtkdOd56gMY1Q%40mail.gmail.com%3E>
>> Tue Aug 1 01:50:32 EDT 2017
>> 
>> If you want to try it out the simplest way to show this off is to do this:
>> Startup CoCo 2 or CoCo3 emulation
>> Create a new disk image in drive 0
>> Create a new disk image in drive 1
>> DSKINI 0
>> DSKINI 1
>> Enter a quick basic program like this and save it to disk:
>> 10 PRINT "DIR 0"
>> 20 DIR 0
>> 30 PRINT "DIR 1"
>> 40 DIR 1
>> 50 GOTO 10
>> SAVE"TEST1.BAS"
>> 
>> Then all you have to do to see the problem is to:
>> DIR 0:DIR 1