Epson 4000 - Manual (Page 129)

Hardware In tempts
Hardware interrupts
IRQ no. Function
IRQ0 Timer output
IRQl Keyboard
IRQ2 Cascade from IRQ controller 2
IRQ3 Serial port 2
IRQ4 Serial port 1
IRQ5 Parallel port 2
IRQ6 FDD controller
IRQ7 Parallel port 1
IRQ8
IRQ9
IRQl0
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
Real-time clock
Reserved
Reserved
Reserved
PS/2 mouse
Math coprocessor
HDD controller
Reserved
A-14 Specifications