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AX = 1A42h
BX = 4156h ('AV')
ES:DI -> FAR handler for serial port using IRQ3
DS = data segment needed by handler
Return:
AX = status/return value
0000h if no more room
1A42h if ASD not installed
else handle to use when uninstalling
Notes: The handler need not save/restore registers or signal EOI to the interrupt controller. The handler should return AX=0000h if the interrupt was meant for it, and either leave AX unchanged or return a non-zero value otherwise. The most recently installed handler will be called first, continuing to earlier handlers until one returns AX=0000h
Category: Serial I/O - Int 2Fh - A
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