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Bitfields for feature byte 1

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Bit Description

7

DMA channel 3 used by hard disk BIOS

6

2nd interrupt controller (8259) installed

5

Real-Time Clock installed

4

INT 15/AH=4Fh called upon INT 09h

3

wait for external event (INT 15/AH=41h) supported

2

extended BIOS area allocated (usually at top of RAM)

1

bus is Micro Channel instead of ISA

0

system has dual bus (Micro Channel + ISA)

See Also:

#00509,#00511