HP Vectra Technical Reference Manual page 240

On Exit: AH
=
Line status (see table 7.5)
Normal Completion Full Transfer:
AL
=
last byte read
ex
=
Number of bytes transferred successfully
ES:DI
=
Base of data buffer
Normal Completion Terminate Character Detected:
AL
=
last byte read (terminate byte)
ex
=
Number of bytes transferred successfully
ES:DI
=
Base of data buffer
Error Completion (bit 7 of AH register non-zero):
AL
=
0, the null byte
ex
=
Number of bytes transferred successfully
ES:DI
=
pointer to next byte to be transferred
Registers Altered: AX,
ex,
DI, ES
Example:
INJUFFER DB 512 OUP (20H)
END_BUFFER:
START:
MOV AX, seg IN_BUFFER ,. set pointer
to
string
MOV ES,AX
LEA 01, offset INJUFFER ,
MOV AX, F14_TRMJUFFER ,. (AX
=
6F04H)
MOV CX, ENOJUFFER-INJUFFER
,. length of character
,. string
MOV OX, 0
,. Port
0
specification
INT
INT_SERIAL ,. Call serial driver
,. (lNT 14H)
TEST AH, 10000000B ,. test for errors
JNZ short ERRORJUT_STRING
CMP AL, BL
,. lower bound?
JL NOTJETWEEN
CMP AL, BH ,. upper bound?
,.
JG NOTJETWEEN
NOTJETWEEN:
Serial and Parrallel I/O 231