49
MPU-401 select from 300~330H (2 bytes)
Digital I/O may select 240H,260H or 280H
B.2 DMA channel assignments
Channel
Function
0
Available
1
Audio*
2
Floppy disk (8-bit transfer)
3
Parallel**
4
Cascade for DMA controller 1
5
Audio*
6
Available
7
Available
* Audio DMA defaults setting: DMA 1.5
Audio High DMA select: DMA 1.3
Audio Low DMA select: DMA 5.6.7
** parallel port DMA default setting: DMA 3
parallel port DMA select: DMA 1.3
B.3 Interrupt assignments
Interrupt #
Interrupt source
NMI
Parity error detected
IRQ 0
System timer
IRQ 1
Keyboard
IRQ 2
Interrupt from controller 2 (cascade)
IRQ 8
Real-time clock
IRQ 9
Available
IRQ 10
Available