IPC@CHIP Documentation - SC12 @CHIP-RTOS V1.10

Interrupt 0x14 service 0x0B: Transmit byte, do not wait.
Place a byte into the transmit buffer if there is space available. Otherwise simply return with AX=0,
without handling the transmit byte.
Parameters
AH
AL
DX
0x0B
Byte to transmit
Port number: 0 for EXT, 1 for COM
Return Value
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AX=0 if byte was not accepted (no space in buffer)
AX=1 if byte was placed in buffer
Interrupt 0x14 service 0x0C: Peek if next byte is available.
Parameters
AH
DX
Returns the next byte available in the receive buffer, without removing it from the buffer.
0x0C
Port number: 0 for EXT, 1 for COM
Return Value
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AX=0xFFFF if no byte was available
AH=0x00 and AL=next byte, if a byte was available.
Interrupt 0x14 service 0x0F: Enable/disable flow control.
Parameters
Configure the flow control for a port.
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