Acer 721TX Service Guide - Page 22

Hardware Configuration and Specifications Memory Address Map Address Range 000000-09FFFF 0A0000-0BFFFF 0C0000-0CBFFF 0F0000-0FFFFF 100000-top limited FE0000-FFFFFF Definition 640 KB memory 128 KB video RAM Video BIOS 64 KB system BIOS Extended memory 256 KB system ROM Interrupt channel default assignment Function Base memory Reserved Video BIOS System BIOS SIMM memory Duplicate of code assignment at 0E00000FFFFF Channel NMI IRQ0 IRQ1 IRQ2 IRQ3 IRQ4 IRQ5 IRQ6 IRQ7 IRQ8 IRQ9 IRQ10 IRQ11 IRQ12 IRQ13 IRQ14 Default setting System errors System timer Keyboard (cascade) Modem/COM1 (can be disable) Infrared mode Edge trigger Edge trigger Edge trigger Edge trigger Edge trigger SoundBlaster Audio (PCI device) Floppy Printer Level trigger Edge trigger Edge trigger Real time clock (SCI for ACPI OS) PCI device Modem Edge trigger Level trigger Edge trigger PCI device Level trigger Pointing device Math coprocessor Hard disk driver Edge trigger Edge trigger Remarks Dynamically programmable Dynamically programmable PCI interrupt sharing Dynamically programmable PCI interrupt sharing Dynamically programmable PCI interrupt sharing 14 System Specifications