Toshiba America Information Systems Inc. ("TAIS") shall not be liable for damages of any kind for use of this information, which is
subject to change without notice. Copyright 1994 TAIS. 4800.DOC Rev. 3 12/29/94 MQC/nmm
Page 1 of 5
System Memory Map
Space
Address range
(Kilobytes)
Used For:
'00000000'
640
Conventional memory
'0009FFFF'
'000A0000'
128
Video RAM
'000BFFFF'
'000C0000'
32
Video BIOS ROM
'000C7FFF'
(Shadow RAM)
'000C8000'
32
Reserved
'000CFFFF'
'000D0000’
64
Reserved
'000DFFFF'
'000E0000'
32
Reserved
'000E7FFF'
'000E8000'
32
Backup RAM
'000EFFFF'
'000F0000'
64
System BIOS ROM
'000FFFFF'
(Shadow RAM)
'00100000'
7,424
System working
'007FFFFF'
memory
'00800000'
16,384
Optional working
'017FFFFF'
memory
'01800000'
256
The rest of system
'0183FFFF'
working memory
'01840000'
Memory expansion in
'07FEFFFF'
expansion port
'07FF0000'
64
System BIOS ROM
'07FFFFFF'
(Duplicated)
Interrupts
Interrup
t
Level
Assigned To:
--
NMI
I/O Channel check
0
Timer (channel 0)
1
Keyboard
2
PIC #2 for level 8 to 15
1
3
COM 2
4
COM 1
5
PRT2 (LPT2)
6
FDC
7
Printer 1 or Windows Sound System
2
8
RTC
9
Software Redirect to INT 0Ah or *Windows Sound System
10
*Windows Sound System
11
*Windows Sound System
12
PS/2 mouse
13
Math-coprocessor
14
HDC
15
Reserved
*: Select one NMI level from 7, 9, 10, or 11 in the Windows Sound System SETUP program.
DMA channels
DMAC
Channel
Assigned To:
0
*Windows Sound System
#1
1
*Windows Sound System
2
Floppy disk
3
*Windows Sound System
#2
4
Cascade for DMAC #1
5
Reserved
6
Reserved
7
(Not used)
*: Select one NMI level from 0, 1, or 3 in the Windows Sound System SETUP program.
