Macros starting with 'd' in i386/isa

• disable_intr i386/isa/npx.c:61
• DMA1_CHN i386/isa/isa.c:70
• DMA2_CHN i386/isa/isa.c:78
• DMA_DONE i386/isa/wt.c:113
• dtoi i386/isa/spkr.c:136