Toshiba T-Series T4900CT - System Memory Map and I;O Assignments; System Memory Map; Interrupts and DMA Channels

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