Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
07711 Media Support Major Always Jul 19, 2020, 18:13 Aug 14, 2020, 17:13
Tester ArcadeShadow View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10 (64-bit)
Status [?] Acknowledged Driver
Version 0.222 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary MESS-specific 07711: ct486: Read 5.25" HD Floppy Disk in a 3.5" HD Floppy drive
Description I have configured a 3.5"HD floppy drive on the [ct486] PC/AT 486 with CS4031 chipset (the bug also happens on another ibm5170's PC).
And I can insert and read and 5.25" HD Floppy Disk on the 3.5" HD Floppy drive. It should not be possible.
Steps To Reproduce
Additional Information
Github Commit
Regression Version
Affected Sets / Systems ct486
Attached Files
png file icon Image.png (96,190 bytes) Jul 19, 2020, 18:13 Uploaded by ArcadeShadow
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User avatar
Jul 19, 2020, 20:59
Which image is this?
Is it happening with just one image or all images?
Can you give command-line examples to duplicate your observed behaviors?
User avatar
Jul 20, 2020, 07:43
It happens with any 5.25"HD floppy images.
For example, take the "Dune (5.25)" [dune525] in the ibm5170 SoftwareList.
Configure the A: floppy drive for a 3.5"HD floppy.
Now you can insert the 5.25" disk image on the A: drive (at this point it should gave an error).
Then you can access the disk with the command prompt "A:", you can make "DIR" command to list the disk files, and "CHKDSK" to analise the disk.
User avatar
Jul 20, 2020, 18:33
edited on: Jul 20, 2020, 18:33
For the CT486 machine you are using, is the internal BIOS selected to use the proper drive?
Setting a device through MAME is only a layer of configuration as the BIOS that runs on the machine, I think, has the final say how that device is used.
User avatar
Jul 20, 2020, 20:45
Yes I have the BIOS sets with the correct drive.
If you see the middle screenshot, you can see that the A: drive is a 3.5" HD floppy drive.
User avatar
Aug 14, 2020, 17:13
It seems to be happening in the Apple II Plus too. It gives me an error saying: "Device 5.25" single density floppy drive load (-floppydisk1 sabotage) failed: file not found