Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
08850 Media Support Major Always Apr 10, 2024, 01:39 Apr 10, 2024, 11:15
Tester pnp2084 View Status Public Platform MAME (Official Binary)
Assigned To Resolution Duplicate OS Windows 10/11 (64-bit)
Status [?] Closed Driver
Version 0.264 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary 08850: DMK Disk format detection rejects single-sided DMK files
Description MAME fails to identify single-sided DMK disk image files and rejects loading them.
Steps To Reproduce Try to load a DMK file e.g.
mame -w trs80m3 -flop1 TRSDOS13.dmk

Results in:
Fatal error: Device 5.25" double density floppy drive load failed: Unable to identify image file format
Additional Information At least one problem: dmk_dsk.cpp checks for byte 4 to be zero but that byte contains flags (e.g. single-sided)
The "i =4" below should be "i = 5"
for (int i = 4; i < 0x10; i++)
    if (header[i] != 0x00)
        return 0;
Introduced by wilbertpol in this commit:

There may be other problems but this is the most likely.
Github Commit
Regression Version
Affected Sets / Systems
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User avatar
Apr 10, 2024, 01:41
Accidental duplicate, 8851 has the proper attachment.
User avatar
Senior Tester
Apr 10, 2024, 11:15
Duplicate of 8851.