MS-DOS 1.25 [TI Professional Computer OEM r1.13]
Released in 1983 by Microsoft/Texas Instruments
For the Texas Instruments Professional Computer
Image Quality: Unused/Unmodified (Disk had some physical damage)

Labeled as "MS-DOS Operating System version 1.13", This is the
special OEM version of MS-DOS needed to operate a Texas Instruments
Professional Computer. It contains IO.SYS 1.13, MSDOS.SYS 1.25,
COMMAND.COM 1.17, and support utilities.

Important: This disk will ONLY boot on a TI Professional Computer. It 
will NOT boot on an IBM PC, IBM hardware compatible PC, or a PC 
emulator.

This archive contains one 5.25 320k (DSDD 8 sector) floppy disk
image.

TI Professional Disks are formatted with an interleave of 1:2 instead
of 1:1. If you use a sector copying tool, you must make sure the 
tracks are formatted appropriately.