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Int 2F Fn 1A43 - Avatar Serial Dispatcher - Install IRQ4 Handler [S]
AX = 1A43h
BX = 4156h ('AV')
ES:DI -> FAR handler for serial port using IRQ4
DS = data segment needed by handler
Return: AX = 1A43h if ASD not installed
= 0000h if no more room
else handle to use when uninstalling
Notes: (see AX=1A42h)
See Also: AX=1A42h,AX=1A63h
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