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Int 61 Fn 1F - PC/tcp Kernel V2.05+ - "net_asynch" - Set Up Asynchronous [N]
AH = 1Fh
BX = network descriptor
CX = event type (see below)
DS:SI -> event handler routine
ES:DI = 32-bit hint passed to handler
Return: CF clear if successful
DS:DX -> previous handler
CF set on error
AX = error code (see INT 61"PC/TCP")
Note: ICMP messages do not trigger events on stream connections
See Also: INT 61"PC/TCP",INT 61/AH=00h"PC/TCP"
Values for event type:
00h alarm
01h open (successfully opened stream connection)
02h receive (data available)
03h transmit (ACK received on stream connection)
04h transmit flush???
05h foreign close (remote host closed data connection)
06h close (local host closed connection and protocol is complete)
07h error (error code passed to handler as arg)
Event handler called with:
BX = network descriptor
CX = event type (see above)
DS:DX -> arg
ES:DI = 32-bit hint value
STACK: small stack, possibly the DOS stack
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