EXOS 2.1 Constants

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5. Software Interrupt Codes

A software interrupt with a certain code can be caused by storing that code in the variable FLAG_SOFT_IRQ. The codes which are used by the built in devices are listed here. Details of enabling and disabling these can be found in the appropriate device driver specification.

KEYBOARD

10h..1fh ?FKEY

Function keys 1 to 8 and also shifted function keys 1 to 8

20h - ?STOP

STOP key pressed

21h - ?KEY

any normal key pressed (this is disabled by default)

NET

30h - ?NET

Data block received on a network channel.

KERNEL

40h - ?TIME

The TIMER EXOS variable has counted down to zero.

Next Chapter: Special Function Sub­Function Codes.