Types Of Memory Used In The Janus 2050 - Intermec Janus 2050 User Manual

JANUS 2050 Vehicle-Mount Computer User's Manual (4MB)

Types of Memory Used in the JANUS 2050

The JANUS 2050 uses the types of memory described in this section. Memory
in the reader is similar to that of a PC in some ways, and very different in other
ways. One major difference is that the reader uses memory to simulate disk
drives. This memory map shows how the reader uses memory.
Address Contents
FFFFFF No Physical Memory
E00000
APPLICATION DISK
C00000 Drive D
Unused Address Space
880000 No Physical Memory
USER FLASH
800000 Drive C
No Physical Memory
400000
3MB DRAM
Extended Memory
Contains 256K Drive E:
110000
HIMEM, 64K
100000 MS-DOS 6.2 Loaded
FFFFF RESET VECTOR
FFFF0 (10H Bytes)
BIOS & PM
(56K)
F2000
INT13/19
F0000 (4K, 8K allowed)
BIOS Extensions
E0000 (64K)
Scanner/Decodes
D0000 (64K)
PC Card Window
C0000 (64K)
B-8
39 nugget
Description
End of 386SX Address Space
2MB Flash
(3.5MB)
512K Flash
(4MB)
HIMEM is included in this 3MB
1MB Real Mode Boundary
Bootstrap Vector
10H ASIC BANKED
BIOS Flash, Shadowed
BIOS Extensions, Shadowed
Upper memory block
Can be used for optional upper memory
A