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T4900CT
(continued)
System Memory Map:
Space
Address Range
(Kilobytes)
'00000000'
640
'0009FFFF'
'000A0000'
128
'000BFFFF'
'000C0000'
32
'000C7FFF'
'000C8000'
32
'000CFFFF'
'000D0000'
64
'000DFFFF'
'000E0000'
32
'000E7FFF'
'000E8000'
32
'000EFFFF'
'000F0000'
64
'000FFFFF'
'00010000'
7,168
'007FFFFF'
'00800000'
32,768
'027FFFFF'
'02800000'
192
'0282FFFF'
'02830000'
'07FEFFFF'
'07FF0000'
64
'07FFFFFF'
Interrupts
Interrup
Level
t
--
NMI
0
1
2
1
3
4
5
6
7
2
8
9
10
11
12
13
14
15
*: Select one IRQ level from 7, 9, 10, or 11 in control panel, drivers, MS Windows Sound System.
DMA channels
DMAC
Channel
0
#1
1
2
3
#2
4
5
6
7
*: Select one DMA level 1, or 3 in control panel, drivers, MS Windows Sound System.
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.
Used For:
Conventional memory
Video RAM
Video BIOS ROM
(Shadow RAM)
Reserved (PNP Work RAM)
Reserved
Reserved
Backup RAM
System BIOS ROM
(Shadow RAM)
System working memory
Optional working memory
The rest of system working
memory
Memory expansion in expansion
port
System BIOS ROM
(duplicated)
Assigned To:
RAM Parity Error, I/O Channel check
Timer (channel 0)
Keyboard
PIC #2 for level 8 to 15
COM 2
COM 1
Reserved
Floppy disk
Printer 1 or Windows Sound System*
RTC
Software Redirect to INT 0Ah
Windows Sound System*
Windows Sound System*
PS/2 mouse
Math Co-processor
Hard disk
Reserved
Assigned To:
Windows Sound System*
ECP or Windows Sound System*
Floppy disk
Windows Sound System*
Cascade for DMAC #1
Reserved
Reserved
Not Used
Copyright 1994 TAIS.
4900.DOC Rev. 2 09/24/96 MQC/nmm
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