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("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: Address Range Space (Kilobytes) Used For: '00000000' '0009FFFF' 640 Conventional memory '000A0000' 128 Video RAM '000BFFFF' '000C0000' 32 Video BIOS ROM '000C7FFF' (Shadow RAM) '000C8000' 32 Reserved (PNP Work RAM) '000CFFFF' '000D0000' 64 Reserved '000DFFFF' '000E0000' 32 Reserved '000E7FFF' '000E8000' 32 Backup RAM '000EFFFF' '000F0000' 64 System BIOS ROM '000FFFFF' (Shadow RAM) '00010000' 7,168 System working memory '007FFFFF' '00800000' 32,768 Optional working memory '027FFFFF' '02800000' 192 The rest of system working '0282FFFF' memory '02830000' Memory expansion in expansion '07FEFFFF' port '07FF0000' 64 System BIOS ROM '07FFFFFF' (duplicated) Interrupts Interrup Level Assigned To: t --NMI RAM Parity Error, 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 Reserved 6 Floppy disk 7 Printer 1 or Windows Sound System* 2 8 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. 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) I/O Port Assignment: Port Address: From/To: Device/Function '000' to '01F' 82C37:DMA Controller 1 '020' to '03F' 82C59:PIC 1 '040' to '05F' 82C54:Timer '060' to '06F' KBC *5 '070' NMI Mask Register '070' to '07F' RTC '080' to '09F' DMA Page Register *2 '0A0' to '0BF' 82C59:PIC2 '0C0' to '0DF' 82C37:DMA Controller 2 '0E0' to '0EF' Not Used '0F0' to '0F7' Math Coprocessor '100' to '1EF' VGA '1F0' to '1FF' HDC '200' to '207' Game I/O *1 '208' to '20F' Not Used '210' to '217' Expansion Unit * 1 '218' to '21F' Not Used '220' to '257' Not Used '258' to '25F' Not Used '260' to '267' Not Used '268' to '26F' Not Used '270' to '277' Not Used '278' to '27F' Parallel PRT 2 *1 '280' to '2A7' Not Used '2A8' to '2AF' Reserved for EMS *1 '2B0' to 2B7' Not Used '2B8' to '2BF' Reserved for EMS *1 '2C0' to '2DF' Not Used '2E0' to '2E7' Not Used '2E8' to '2EF' Reserved for EMS *1 '2F0' to '2F7' Not Used '2F8' to '2FF' Serial Port 2 (COM2) '300' to '31F' Prototype Card *1 '320' to '32F' XT type HDC *1 '330' to '337' Not Used '338' to '33F' Serial Port 3 (COM3) *4 '340' to '377' Not Used '378' to '37F' Parallel PRT 1 '388' to '38B' FM Synthesizer '390' to '39F' Not Used '3A0' to '3AF' Bisynchronous 1 *1 '3B0' to '3BF' MDA, Parallel PRT 3 '3C0' to '3DF' CGA, EGA, VGA '3E0' to '3E7' Not Used '3E8' to '3EF' Serial Port 3 (COM3) *4 '3F0' to '3F7' FDC *3 '3F8' to '3FF' Serial Port (COM1) '400' to '47F' Not Used '480' to '49F' DMA Hi-Page Register *2 '530' to '537' Sound System '604' to '60B' Sound System 'E80' to 'E87' Sound System *1: It is used for expansion cards installed in Desk Station IV expansion slots. *2: 16 x 8 bit read-write registers are assigned to addresses '080' - '08F' and '480' - '49F', however, part of this area is assigned for DMA page register and DMA high-page register. The area not used for either of these registers can be used for other purposes. However, if ports '&90' - '&9F' are accessed, '&80' - '&8F' are also accessed. '&81', '&82', '&83', '&87', '&89', '&8A', '&8B. and '&8F' are used for DMA Page Register /DMA High Page Register. '&80', '&84', '&85', '&86', '&88', '&8C', '&8D', and '&8E' are used for other purpose or not used. &=0: DMA Page Register &=4: DMA High Page Register *3: I/O Ports '3F6' and '3F7' also, are used for the HDC. *4: It is used for Desk Station IV's COM3. *5: I/O ports '060' and '064' are KBC. '061' is system status port. 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 ...

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