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Format of HMA Memory Block (DR DOS 6.0 kernel loaded in HMA)

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Offset Size Description

00h

WORD

offset of next HMA Memory Block (0000h if last block)

02h

WORD

size of this block in bytes (at least 10h)

04h

BYTE

type of HMA Memory Block (interpreted by MEM)
00h = system
01h = KEYB
02h = NLSFUNC
03h = SHARE
04h = TaskMAX
05h = COMMAND

05h

var

TSR (or system) code and data. DR DOS TSR's, such as KEYB, hooks interrupts using segment FFFEh instead FFFFh.