High Memory Area (Hma; User Flash Memory; Application Flash Memory - Intermec JANUS 2020 User Manual

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JANUS 2020 Hand-Held Computer User's Manual (4MB)

High Memory Area (HMA)

The high memory area (HMA) is a 64K block of memory, starting 16 bytes

below the 1024K mark, and is the first 64K of extended memory.

Since HMA can only hold one item, the first program that requests HMA uses

it, regardless of the size of the program. The DOS=HIGH statement in

CONFIG.SYS loads MS-DOS into high memory.

User flash memory contains the 512K ROM drive C. It is mapped to 800000H.

Drive C is similar to the hard drive C on your PC and contains the MS-DOS

startup files, CONFIG.SYS, and AUTOEXEC.BAT.

Since drive C is a ROM drive that resides in flash memory, you cannot write

files to this drive as you would on your PC. You must use the Auto-Loader or

MakeDisk and PutDisk to modify the startup files or change other files on

Application flash memory is the 2MB ROM drive D. It is mapped to C00000H.

DOS files and utilities are stored on drive D.