Compaq AP550 Compaq Professional Workstation AP550 Maintenance & Service G - Page 160
Table 7-3, System Direct Memory Access DMA, System I/O, Hardware DMA, System Function, I/O Address Hex
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7-4 Compaq Professional Workstation AP550 Maintenance and Service Guide Hardware DMA DMA 0 DMA 1 DMA 2 DMA 3 DMA 4 DMA 5 DMA 6 DMA 7 I/O Address (Hex) 000 - 00F 010 - 01F 020 - 021 02E - 02F 040 - 043 044-04D 04E - 04F 050-05F 060 061 062 - 063 064 065 - 06F 070 - 071 072-077 072 - 07F 080 - 08F 090 - 091 Table 7-3 System Direct Memory Access (DMA) System Function Business Audio (default; alternate = DMA0, none) Business Audio (default; alternate = DMA0, DMA3, none) Diskette drive ECP parallel port LPT1 (default; alternate = DMA 0) DMA controller cascading Unused Unused Unused Table 7-4 System I/O System Function (Shipping Configuration) DMA controller # 1 Unused Interrupt controller # 1 Super I/O index/data registers Counter/Timer Unused Super I/O index/data register alternate Unused Keyboard controller Port B Unused Keyboard controller Unused NMI enable/real-time clock CMOS storage Unused DMA page registers Unused continued