Technical information

B/10 LS PRO OWNER'S HANDBOOK
Technical Information
Appendix B
DMA channels
Some hardware devices can use a direct memory access (DMA)
channel to access system memory without directly burdening
the processor.
The following table shows the assignment of DMA channels. (The
current PCMCIA standards do not allow PC Cards to use DMA
channels.)
DMA Assignment
DMA0 Enhanced Business Audio (capture)
DMA1 Enhanced Business Audio (playback)
DMA2 Diskette controller
DMA3 Enhanced Capabilities Port
DMA4 System
DMA5
DMA6
DMA7
I/O ports
I/O ports are used by the processor to communicate with
hardware devices. Each port appears to the processor as an
address low down in its address space, usually below 3FFh.
The following table shows the typical assignment of I/O ports:
I/O port Typical assignment
000h-01Fh DMA controller 1
020h-027h Interrupt controller 1
030h-037h Interrupt controller 1
040h-047h System timer
050h-057h System timer
060h-06Fh Keyboard controller
070h-07Fh Real time clock, NMI mask
080h-09Fh DMA page register
0A0h-0BFh Interrupt controller 2
0C0h-0DFh DMA controller 2
0F0h, 0F1h Math coprocessor
0F8h-0FFh Math coprocessor
1F0h-1F8h Hard disk drive controller