Format of PCMCIA Socket Characteristics table: Offset Size Description ) 00h WORD supported card types (see #00683) 02h WORD steerable IRQ levels (bit 0 = IRQ0 to bit 15 = IRQ15) 04h WORD additional steerable IRQ levels bit 0: NMI bit 1: I/O check bit 2: bus error bit 3: vendor-unique bits 4-7 reserved (0)