martypc/floppy

Floppy Directory

Put floppy images in this directory. Valid image formats are flat sector images of the type created by WinImage, dd or other such utilities, typically with *.img or *.ima extensions. Compressed *.imz images are not supported.

MartyPC will adjust the floppy drive size within the capabilities of the currently emulated machine, based on the size of the image loaded. Thus if you load a 720KB floppy image, the drive becomes a 720KB floppy drive. There is no need to configure this setting.

However, if emulating a IBM PC or XT, note that certain floppy sizes will not work as the machine/BIOS does not know how to handle a disk of that size.

Floppy images must be one of these exact file sizes:

bytes	type
163,840	160KB floppy, single-sided	Rare, only used by the earliest PCs.
184,320	180KB floppy, single-sided	Rare, only used by the earliest PCs.
327,680	320KB floppy, double-sided	Somewhat rare.
368,640	360KB floppy, double-sided	Extremely common.
737,280	720KB floppy, double-sided	Extremely common.
1,228,800	1.2MB floppy, double-sided	Extremely common.

The exception is anything smaller than 163,840 bytes will be loaded as that size, padded with 0s. This is a convenience feature for development of boot sector software or loading of boot sector demos and games.