Apple II DOS 3.3 BASICS

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Apple II DOS was a family of disk operating systems for the Apple II series. In August 1980, Apple released an upgrade for DOS 3.3. consisting of a new System Master disk and a hardware upgrade chip.

The original disk drive had been designed with the ability to read and write 35 tracks of 13 sectors each on a 5.25 inch disk. At 256 bytes possible per sector, this made the disk capable of holding 113.75Kb of information. Since it was designed to have DOS present on each disk in the first three tracks, and the catalog took up another entire track, there was actually only 100.75Kb available for data storage. Steve Wozniak, the author of the original DOS disk driver (RWTS), had found a way to increase the storage capacity of Apple floppy disks to 16 sectors per track, resulting in a disk that could now hold a maximum of 140K of data (124K excluding DOS and the catalog track), a 23 percent increase. The great thing about this upgrade was that the disk drives themselves did not need to be changed to make this possible. Only the ROM program on the Disk II controller card needed to be changed to make the move to DOS 3.3.

This separate disk called DOS 3.3 BASICS was included that could be used in the same way as a pre-boot for 13 sector disks.

Platform: Apple II, II+, IIe 48Kb RAM

OS: Apple DOS 3.3

System Software (SS:) Apple DOS 3.3

Version: 3.3

Platform :	Apple II
Format :	Disk 5.25
Publisher :	Apple
Authors :
Date :	1980
Product Code :

Related Items in the Collection:

Apple II ProDOS

Apple II DOS 3.3

Apple II Monitor ROM Listings

Apple II DOS User's Manual

Apple II DOS 3.3 - Set of Disks

Macintosh System 7 Personal Upgrade

Mac OS System 7.5

Mac OS System 7.6

BeOS Preview Release 2

Mac OS X Versions 10.1.3/10.2/10.3

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