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JANUS 2010 Hand-Held Computer User's Manual (4MB)
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nugget
Types of Memory Used in the Reader
Address
Contents
FFFFFF
No Physical Memory
E00000
APPLICATION DISK
Drive D
C00000
Unused Address Space
880000
No Physical Memory
USER FLASH
Drive C
800000
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
F2000
(56K)
INT13/19
(4K, 8K allowed)
F0000
BIOS Extensions
E0000
(64K)
Scanner/Decodes
D0000
(64K)
PC Card Window
C0000
(64K)
A-14
helconital
The JANUS reader 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.
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
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