Epson ActionTower 7500 User Manual - Page 174
Hardware Interrupts, System Memory Map
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Hardware Interrupts IRQ no. IRQ0 lRQ1 IRQ2 IRQ3 IRQ4 IRQ5 IRQ6 IRQ7 IRQ8 IRQ9 IRQ10 IRQ11 IRQ12 IRQ13 IRQ14 IRQ15 Function I Timer output 0 I Keyboard Cascade to IRQ9 Serial port 2 Serial port 1 Available Diskette drive controller Parallel port 1 Real-time clock Available Reserved Reserved PS/2 mouse Math coprocessor Primary IDE controller Secondary IDE controller System Memory Map Address range FE0000h-FFFFFFh 100000h-FDFFFFh 0E0000h-0FFFFFh 0C8000h-0DFFFFh 0C0000h-0C7FFFh 0A0000h-0BFFFFh 000000h-09FFFFh Function 128KB duplication of ROM BIOS stored at 0E0000h-0FFFFFh System extended memory (128MB maximum) 128KB ROM BIOS Adapter ROM BIOS Video ROM BIOS 128KB video memory 640KB base memory A-12 Specifications
![](/manual_guide/products/epson-actiontower-7500-user-manual-eb66eee/174.png)
Hardware
Interrupts
IRQ no.
Function
IRQ0
I
Timer output 0
lRQ1
I
Keyboard
IRQ2
Cascade to IRQ9
IRQ3
Serial port 2
IRQ4
Serial port 1
IRQ5
Available
IRQ6
Diskette drive controller
IRQ7
Parallel port 1
IRQ8
Real-time clock
IRQ9
Available
IRQ10
Reserved
IRQ11
Reserved
IRQ12
PS/2 mouse
IRQ13
IRQ14
IRQ15
Math coprocessor
Primary IDE controller
Secondary IDE controller
System Memory Map
Address range
FE0000h-FFFFFFh
100000h-FDFFFFh
0E0000h-0FFFFFh
0C8000h-0DFFFFh
0C0000h-0C7FFFh
0A0000h-0BFFFFh
000000h-09FFFFh
Function
128KB duplication of ROM BIOS stored at 0E0000h-0FFFFFh
System extended memory (128MB maximum)
128KB ROM BIOS
Adapter ROM BIOS
Video ROM BIOS
128KB video memory
640KB base memory
A-12
Specifications