Avery Dennison 6035 Programmer Manual Rev.A 7/98 - Manual (Page 46)

2-34 ROM-DOS 6.22 User Manual 7/9/98
Examples
Device = HIMEM.SYS
Installs the XMS device driver. Once this driver is installed, accessing
the HMA and Extended Memory (XMS) memory areas is legal. The
Extended Memory area can contain up to 2 GB’s of memory. Typical
systems have 4, 8, or 16 MB’s XMS memory installed.
Device = HIMEM.SYS /machine:1
Forces the use of the AT style A20 line control.
The HIMEM driver fails to load if the machine does not have memory
above the 1 MB boundary or the BIOS does not provide support for it.
It also fails to load if another XMS manager has been installed
previously.
DOS Conventional RAM
Video Buffers
HMA
1MB
384K
64K
BIOS
DOS Vectors
640K
High
Low
16 MG
Upper
Memory
Extended Memory