IBM 4840-563 User Manual

Appendix D Memory Map
ADDRESS
RANGE (DEC)
ADDRESS
RANGE
(HEX)
SIZE ISA BUS
DECODE
DESCRIPTION
0 to 639K 00000 to
9FC00
512K positive,
subtractive
Conventional DOS memory
639K 9FC00 to
9FFFF
1K positive,
subtractive
EBDA (Extended BIOS Data)
moveable by HIMEM, QEMM,
386MAX
640K to 767K A0000 to
BFFFF
128K positive,
subtractive
Intel 82845GVLegacy Video
Buffer
768K to 815K C0000 to
CBFFF
48K positive,
subtractive
Intel 82845GV Video ROM BIOS
(shadowed)
816K to 895K CC000 to
DFFFF
80K positive,
subtractive
PCI/ISA Space, DOS memory
managers
896K to 1MB E0000 to
FFFFF
128K positive,
subtractive
System ROM BIOS (ISA Bus,
main memory shadowed) and
USB Legacy space
1MB to 16MB 100000 to
FFFFFF
15MB positive,
subtractive
PCI/ISA Space
16MB to 4GB-
20M
1000000 to
FEBFFFFF
4060MB subtractive only PCI Space
4GB-20M to
4GB-19M
FEC00000 to
FECFFFFF
1MB subtractive only APIC Configuration space
4GB-19M to
4GB-18M
FED00000 to
FEDFFFFF
1MB subtractive only PCI - hub interface
4GB-18M to 4GB
- 17M
FEE00000 to
FEEFFFFF
1MB subtractive only APIC Configuration space
4GB-17M to 4GB
- 2M
FEF00000 to
FFDFFFFF
15MB subtractive only PCI - hub interface
4GB -2M to 4GB FFE00000 to
FFFFFFFF
2MB subtractive only System ROM BIOS, extended
BIOS for PCI devices, A20 Alias
of System BIOS
SurePOS 500 Model XX3 Technical Reference, v 1.3 Page 37 of
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IBM 4840-563 Specifications

General

Brand	IBM
Model	4840-563
Category	Cash Register
Language	English