BOS/360

BOS was one of four System/360 Operating System Versions developed by the IBM General Products Division (GPD) in Endicott, NY to fill a gap at the low end of the System/360 line when it became apparent that OS/360 was not able to run on the smallest systems. BPS (Basic Programming support) was designed to run on systems with a minimum of 8K bytes of memory and no disk. BOS was intended for disk systems with at least 8K bytes and one 2311 disk drive. DOS and TOS were developed for systems with at least 16K bytes and either disks or tape drives.