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MS-DOS 6.0 UPGRADE PACKAGE 251-8155 251-8157 (English) 251-8156 251-8158 (French) Recommended System Requirements: 286AT or Better 1MB Memory - 640K Base, 384K Extended 3.5" or 5.25" High Density Drive Hard Drive New Features: Improved Memory Management Microsoft's Anti-Virus program (Requires purchase of updates) New BACKUP program for DOS and Windows Hard Drive Defragmenter INTERLNK program for file transfers between computers Improved DOS HELP program New UNDELETE program Problems with 1000's and DOS6.0: The README.TXT file on the DOS 6.0 Installation Diskette Set warns customers of ROM-Based computers to contact the hardware manufacturer before installing. SEE DIRECT QUOTE BELOW 1.5 Tandy with ROM DOS ---------------------- Contact your hardware manufacturer for information about upgrading a Tandy computer with ROM DOS to MS-DOS 6. This applies to the following models: 1000EX, 1000HX, 1000SL, 1000SL2, 1000TL, 1000TL2, 1000TL3, 1000RL, 1000RLX, 1000RL-HD, 1000RLX-HD, 1100FD, 2500XL. The early 1000's up to and including the 1000TX computer have problems formatting and reading floppy drives to their fullest capacity with any DOS higher than DOS 3.2. These formatting and reading problems show themselves as a 720K drive behaving as a 360K drive. The 1000's have also shown problems with hard drive FAT tables being scrambled or corrupted by DOS version higher than 3.2, thereby rendering the hard drive inoperable!. The 1000's ROM DOS-Based systems will lose the use of Deskmate if any other version of DOS is loaded other than the one it was shipped with. The Tandy 1000 ROM DOS based computers are either 8088, 8086, or 286XT's, because of this they can't load DOS into high memory. Therefore all of DOS must reside in base memory, (640K) leaving less of it free for programs to run in. The original DOS 3.2 or 3.3 leaves between 557K to 575K of free memory for programs to run in. Installation of DOS 5.0 or 6.0 may scramble the EEPROM chip beyond recoverability on the Tandy 1000 ROM-DOS based computers. This will causing the computer to lock with the 640K memory size displayed on the screen and fail to boot any further. To correct this problem the computer will have to have it's EEPROM chip replaced at a repair depot. The Kernel of DOS 6.0 is the same size as that of DOS 5.0 but 17K larger than that of DOS 3.3. After the DOS kernel and a mouse driver have been loaded into memory you are left with approximately 538K to 545K of free memory. If you use DoubleSpace to increase the hard drive size, DOS 6.0 will automatically load a 42K driver to support the compressed drive. This will leave approximately 496K to 503K of free memory for software to run in. As most programs for these machines require between 540K to 580K of free memory, this will leave insufficient base memory for these programs to run in. If you have any questions about DOS upgrades on any systems call COMPUTER SUPPORT at (705) 728-7474 /Ext. 4327 before installing.