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14 System Specifications
Hardware Configuration and Specifications
Memory Address Map
Address Range Definition Function
000000-09FFFF 640 KB memory Base memory
0A0000-0BFFFF 128 KB video RAM Reserved
0C0000-0CBFFF Video BIOS Video BIOS
0F0000-0FFFFF 64 KB system BIOS System BIOS
100000-top limited Extended memory SIMM memory
FE0000-FFFFFF 256 KB system ROM Duplicate of code
assignment at 0E0000-
0FFFFF
Interrupt channel default assignment
Channel Default setting mode Remarks
NMI System errors
IRQ0 System timer Edge trigger
IRQ1 Keyboard Edge trigger
IRQ2 (cascade) Edge trigger
IRQ3 Modem/COM1
(can be disable)
Edge trigger Dynamically
programmable
IRQ4 Infrared Edge trigger Dynamically
programmable
IRQ5 SoundBlaster
Audio (PCI
device)
Level trigger PCI interrupt
sharing
IRQ6 Floppy Edge trigger
IRQ7 Printer Edge trigger Dynamically
programmable
IRQ8 Real time clock Edge trigger
IRQ9 (SCI for ACPI
OS) PCI device
Level trigger PCI interrupt
sharing
IRQ10 Modem Edge trigger Dynamically
programmable
IRQ11 PCI device Level trigger PCI interrupt
sharing
IRQ12 Pointing device Edge trigger
IRQ13 Math
coprocessor
Edge trigger
IRQ14 Hard disk driver
720.book Page 14 Saturday, March 6, 1999 10:00 AM