IBM PC CONVERTIBLE Technical Reference page 172

00A9
OOAA
OOAB
OOAC
OOAE
OOBI
00B3
00B4
00B6
00B9
OOBB
OOBE
00C2
00C3
00C6
00C6
OOCA
OOCD
OOCE
0000
0001
0002
= 03FB
0005
0005
0006
0007
0008
OODA
0000
OODF
OOEl
00E4
00E6
00E8
OOEA
OOEC
OOEE
OOFO
00F2
00F4
EE
42
42
B7 20
E8 0158 R
75 DB
4A
B7 01
E8 0158 R
75 03
80 E4 lE
8B 94 0000
EC
E9 003F R
OUT DX,AL
INC OX
INC OX
MOV
BH,DSR_BIT
CALL WAILFOILSTATUS
JNZ A8
DEC OX
MOV BH,1
CALL WAILFOILSTATUS
JNZ A8
AND AH,RCLERR
MOV
OX, RS23LBASE [S I]
IN AL,DX
JMP A3
COMMO PORT STATUS ROUTINE
A18:
MODEM STATUS REGISTER
DATA SET READY
TEST FOR DSR
NO, RETURN WITH ERROR
LINE STATUS REGISTER
RECEIVE BUFFER FULL
TEST FOR REC. BUFF. FULL
NO, SET TIME OUT ERROR
SAVE ERR ON RECV CHAR
DATA PORT
GET CHARACTER FROM LINE
RETURN
8B 94 0000 R MOV OX, RS23LBASE [SI]
83 C2 05
EC
8A EO
42
EC
E9 003F R
53
51
52
E4 7C
BA 03FB
B4 10
Bl 04
F6 C3 03
75 06
FE CE
DO EC
FE C9
OA FF
74 06
OA C3
E6 7C
EB 47
ADD
IN
MOV
INC
IN
JMP
DX,5
AL,DX
AH,AL
OX
AL,DX
A3
LINE STATUS REGISTER
GET LINE CONTROL STATUS
PUT IN AH FOR RETURN
~I~
ro
~D~ ~MUS
Rffi
GET MODEM CONTROL STATUS
RETURN
COM_POWER
TURN POWER ON/OFF TO COMMO CARD
ENTRY:
BL = MODEM/ASYNC POWER BIT IN FEATURE CONFIGURATION REGISTER
( =02 FOR MODEM, =04 FOR ASYNC SEC, =05 ASYNC PRIMARY
BH = 0 - TURN POWER OFF
= 1 - TURN POWER ON
EXIT: AH = 0 AND CF = 0 IF OPERATION OKAY
AH = 80 AND CF = 1 I F POWER ON REQSTED AND NO RESP FROM 8250
WITHIN 500 MSEC
REGISTERS USED:
AX IS DESTROYED. ALL OTHERS ARE NOT MODIFIED.
INTERRUPTS:
INTERRUPTS ARE ENABLED WITHIN ROUTINE, RESTORED UPON EXIT.
---
- -- - - - - -- -- - -
-
--
--
--
--
- --
-
----
--
--
--
-
- - -
--
-
---------------
--
----
--
; LOCAL EQUATES
EQU 3FBH
COM-POWER PROC NEAR
PUSH BX SAVE REGISTERS
PUSH CX
PUSH OX
IN AL,KYBD_CNTL GET INITIAL REG CONTENTS
MOV DX,LINE_CTL_REG PRI PORT LINE CONTROL REG
MOV AH,10H SET FOR LVL 4 SYSTEM IRPT
MOV CL,4 ; PARM FOR GELVECTOR CALL
TEST BL,SELRS23LPRIM+ACLMODEM; PRIMARY ASYNC?
JNZ CPO
DEC DH NO - POINT TO SEC INT 10 REG
SHR AH,1 SET FOR LEVEL 3 SYSTEM IRPT
DEC CL ADJUST PARM FOR LEVEL 3 I RPT
CPO:
JZ
OR
OUT
JMP
OR BH, BH
CPl
AL,BL
KY BD_CNTL, AL
SHORT CP2
CHECK REQUEST CODE
JUMP I F A POWER OFF REQUEST
TURN POWER ON
BE ABLE TO HANDLE ANY PENDING INTERRUPT WHEN POWER IS TURNED OFF
ROM BIOS 2-147