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DMAs
PCS PC-compatible DMA channels:
DMA0 8-bit IEEE1284 ECP port or Sound Blaster
DMA1 8-bit IEEE1284 ECP port (BIOS Setup) or Sound Blaster
DMA2 8-bit Floppy Disk Controller
DMA3 8-bit Sound Blaster
DMA4 DMA0–DMA3 cascade
DMA5 16-bit unassigned
DMA6 16-bit unassigned
DMA7 16-bit unassigned
I/O Address List
Never attempt to access an I/O address for which no device exists.
I/O Address Device
0000 to 000F DMA controller
0020 to 0021 Interrupt controller
0040 to 0043 System timer
0060 to 0064 Keyboard controller, NMI status and control is at 0061
0070 to 0071 Real-time clock, NMI mask
0080 to 008F DMA bank register
0094 to 009F VGA controller
00A0 to 00A1 Interrupt controller
00B2 to 00B3 Power Management
00C0 to 00DE DMA controller 2
00F0 to 00FF Coprocessor
0102 to 010F VGA controller
0220 to 022F Sound generator
02E8 to 02EE Serial port COM4
02F8 to 02FE Serial port COM2
0378 to 037F Parallel port
0388 to 038B Sound generator
0398 to 0399 Super I/O #1
03B4 to 03DA VGA controller
03E8 to 03EE Serial port COM3
03F0 to 03F7 Floppy disk controller
03F8 to 03FE Serial port COM1
0CF8 to 0CFF PCI bus controller
46E8 to 46E9 VGA controller
Appendix B: Programming Interface 35
CS Manual LAYOUT#1787 3/9/98 5:33 PM Page 35