Specifications

EPC-3305 Hardware Reference
68
Table A-13. Second (16-bit) DMA controller
I/O Addr Functional group R/W Usage
00C0 DMA controller 2 R/W DMA 2 channel 4 address
00C2 R/W DMA 2 channel 4 count
00C4 R/W DMA 2 channel 5 address
00C6 R/W DMA 2 channel 5 count
00C8 R/W DMA 2 channel 6 address
00CA R/W DMA 2 channel 6 count
00CC R/W DMA 2 channel 7 address
00CE R/W DMA 2 channel 7 count
00D0 R
W
DMA 2 status
DMA 2 command
00D2 W DMA 2 write request
00D4 W DMA 2 write single mask bit
00D6 W DMA 2 write mode
00D8 W DMA 2 clear byte pointer
00DA W DMA 2 master clear
00DC W DMA 2 clear mask
00DE R/W DMA 2 read/write all register mask
bits
Table A-14. Coprocessor interface
I/O Addr Functional group R/W Usage
00F0 Coprocessor W Coprocessor error
Table A-15. VGA controller
I/O Addr Functional group R/W Usage
x102 VGA controller R/W POS102 register
Table A-16. Secondary IDE
I/O Addr Functional group R/W Usage
0170 Secondary IDE R/W Data
0171 R/W Error/features
0172 R/W Sector count
0173 R/W Sector number
0174 R/W Cylinder low
0175 R/W Cylinder high
0176 R/W Drive/head
0177 R/W Status/command