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System Memory Map
000FFFFFFh
000FF0000h
OOOFEOOOOh
001OOO0Oh
OOOFOOOOh
OOOC8O0Oh
OOOCO0OOh
000B8000h
OOOBOOOOh
OOOAOOOOh
00000000h
System BIOS ROM: 84KB
Duplicated from OFOOOOh
Resewed for system board: 84KB
Duplicated from OEOOOOh
Extended memory
System BIOS ROM: 84KB
Default Shadow RAM duplicated at FFOOOOh
Unused or l/O expansion ROM: 160KB
Reserved for ROM on l/O adapters
VGA BIOS ROM: 32KB
Default Shadow RAM
VGA text
(color): 32KB
Unused or VGA text
(monochrome): 32KB
Video memory: 64KB
Reserved for graphics display buffer
Conventional system memory: 640KB
System l/O Address Map
64MB
(Maximum
system
memory)
1MB
640KB
Hex
address
000-01F
1
Assigned device
1
DMA controller 1,8237
020 - 03F
lnterrupt controller 1,8259, master
022 - 024
Chip set configuration register
040 - 05F
Timer, 8254
080-08F
Keyboard controller, 8042
070 - 07F (CMOS) Real-time clock NMI (non-maskable Interrupt) mask
080
-
09F
DMA page register, 74LS612
1
OAO-0BF
084, 0BB
0BC
1
Interrupt controller 2,825QA
1
AD12 control register
1
AD12 control register
OCO - ODF
OF0
OF1
0F8 - 0FF
DMA controller 2,8237
Clear math coprocessor busy
Reset math coprocessor
Math coprocessor
Epson
ActionDesk
4000
Information Reference List
Engineering Change Notices
None.
Technical Information Bulletins
None.
Product Support Bulletins
None.
Related Documentation
TM-ACTD4
Epson ActionDesk 4000 Service Manual
PL-ACTD4 Epson ActionDesk 4000 Parts Price List
4002497
Epson ActionDesk 4000 User’s Guide
9/15/93
Epson ActionDesk 4000-7