MEM 0040h:008Eh - FIXED DISK - INTERRUPT CONTROL [not XTIBM PC XT] Size: BYTE Note: cleared to 00h at start of disk operation, set to FFh by IRQ14 handler when hard disk controller completes command SeeAlso: MEM 0040h:008Ch,MEM 0040h:008Dh,MEM 0040h:008Fh