HP Vectra Technical Reference Manual page 231

Table 7.4
Serial Port Driver Function Code Summary
INT Function
Hex Equate
14H INT_SERIAL
F14_INIT
F14---><MIT
F14_RECV
F14_STATUS
F14_INQUIRE
F14_EXINIT
F14_PUT_BUFFER
F14_GET_BUFFER
F14_TRM_BUFFER
Function
Value
OOH
01H
02H
03H
6FOOH
6F01H
6F02H
6F03H
6F04H
Definition
Serial
Initialize Serial Port Parameters
Send Out One Character
Receive One Character
Get Serial Port Status
EX-BIOS present
Initialize serial port (19.2 Kbaud)
Write a buffer of data
Read a buffer of data
Read a buffer of data, terminate on specified
condition
Serial Port Driver Function Definitions
All of the following functions range check (between 0 and 3 inclusive) the requested port
number specified in the DX register. If legal, the function looks up the I/O address contained in
the 5TD-8105 data area. If the port table entry is non-zero the port is assumed to exist. If the port
table entry is zero the function returns without altering any registers.
F14_INIT (AH
=
OOH)
The initialize function, F14_INIT, sets the baud rate, nU"r.lber of stop bits, parity and character
length of the specified serial port. On return it reports the current contents of the line status
register and the modem status register of the specified port.
222 Serial and Parrallel I/O