INT 60 u - HP 95LX System Manager - QUERY COMM CHANNEL RECEIVE QUEUE
        DI = 0E0Ah
        STACK:  2 WORDs unused dummies (for calls from high level languages)
                WORD    comm channel handle
                DWORD   pointer to WORD to get receive buffer size
                DWORD   pointer to WORD to get free bytes in receive buffer
Return: ???
        STACK unchanged
SeeAlso: INT 60/DI=0E09h,INT 60/DI=0E0Bh