[Coco] [COCO] MAME FDC Issue that can cause corruption

[Ron Klein]

Let me clarify...

I sent the developer your example below.  I want to have him try the OS-9
example from your video, but want to know what DSK images you used.

Thanks!


On Tue, Aug 1, 2017 at 5:27 AM, Ron Klein <ron at kdomain.org> wrote:

> Hi David,
>
> I'll get this in front of one of the MAME developers to look at.  Please
> provide the links to the DSK images you used so the developer can reproduce
> the exact issue you are describing.
>
> Thanks!
>
>
> On Tue, Aug 1, 2017 at 12:50 AM, David Ladd <davidwladd at gmail.com> wrote:
>
>> Dear MAME users,
>>
>> Over the last couple months I have been doing a LOT of disk testing and
>> stuff with emulators, but is even more scary than I thought 2 months ago.
>>
>> I just found out tonight that MAME does indeed have a issue related to the
>> FDC emulation.  I can reproduce the issue in NitrOS-9 L1/L2 or OS-9 L1/L2.
>> I have even been able to re-produce some stuff in Disk Basic.
>>
>> Till this issue is fixed I would recommend to not use more than 1 floppy
>> drive in MAME.
>> 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
>>
>> You will see TEST1.BAS show up twice.  Which it should not.
>>
>> So please take heed that this can cause corruption if data is written to
>> both drives at same time.  I found this out the hard way tonight.
>>
>> I am also going to clarify I am doing this just as a warning.  I am not
>> trying to scare people away from MAME or say one emulator is better than
>> another one.  I just want people to take heed with this issue till the
>> problem has been addressed.
>>
>> Also the more people who can also verify this problem and report it to the
>> development website for MAME might also help motivate the dev team to fix
>> the issue as well.
>>
>> Thank you for your time with reading this.
>>
>> +-----------------------------------------------------------------------+
>> | David Ladd a.k.a. PacoOtaktay a.k.a. Drencor                          |
>> | YouTube: http://www.youtube.com/user/PacoOtaktay                      |
>> | YouTube Gaming Live: https://gaming.youtube.com/user/PacoOtaktay/live |
>> | Websites: http://dwladd.com     &     http://www.theterrorzone.com    |
>> | G+:  https://plus.google.com/113262444659438038657                    |
>> | G+:  https://plus.google.com/+DavidLaddPacoOtaktay                    |
>> |                                                                       |
>> | Do you have your CoCo 3 yet?                                          |
>> +-----------------------------------------------------------------------+
>>
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>
>