IBM PC CONVERTIBLE User Manual

0041 5F
0042 5E
0043 5A
0044 IF
0045 CF
0046
0046
8A EO
0048 83 C2 03
004B BO 80
004D EE
004E 8A D4
0050 Bl 04
0052 D2 C2
0054 81 E2 OOOE
0058 BF 0000 E
005B 03 FA
005D 8B 94 0000 R
0061 42
0062 2E: 8A 45 01
0066 EE
0067 4A
0068 2E: 8A 05
006B EE
006C 83 C2 03
006F 8A C4
0071 24 IF
0073 EE
0074 4A
0075 4A
0076 BO 00
0078 EE
0079 EB 4B
007B
007B
50
007C 83 C2 04
007F BO 03
0081 EE
0082 42
0083 42
0084 B7 30
0086 E8 0158 R
0089 74 08
008B
008B
59
008C 8A Cl
008E
008E 80 CC 80
0091 EB AC
0093
0093
4A
0094 B7 20
0096 E8 0158 R
0099 75 FO
009B 83 EA 05
009E 59
009F 8A Cl
OOAI EE
00A2 EB 9B
00A4
00A4 83 C2 04
00A7 BO 01
POP
POP
POP
POP
IRET
DI
SI
DX
DS
; RETURN TO CALLER
INITIALIZE THE COMMUNICATIONS PORT
M:
MOV
ADD
MOV
OUT
AH,AL
DX,3
AL,DLAB
DX,AL
SAVE INIT PARMS IN AH
POINT TO 8250 CONTROL REG
ACCESS BAUD RATE BY
SETTING DLAB=1
DETERMINE BAUD RATE DIVISOR
MOV
MOV
ROL
AND
MOV
ADD
MOV
INC
MOV
OUT
DEC
MOV
OUT
ADD
MOV
AND
OUT
DEC
DEC
MOV
OUT
JMP
DL,AH
CL,4
DL,CL
GET PARMS TO DL
DX,OEH ; ISOLATE THEM
DI,OFFSET BAUD_TABLE; BASE OF TABLE
DI,DX PUT INTO INDEX REGISTER
DX,RS23LBASE[SIJ POINT TO HIGH ORDER OF DIV
DX
AL,CS: [DIJ+l
DX,AL
DX
AL,CS: [DIJ
DX,AL
DX,3
AL,AH
AL,OIFH
DX,AL
DX
DX
AL,O
DX,AL
SHORT AI8
GET HIGH ORDER OF DIVISOR
SET HIGH OF DIVISOR
GET LOW ORDER OF DIVISOR
SET LOW OF DIVISOR
ADDRESS LINE CTR REG
GET PARMS BACK
STRIP OFF THE BAUD BITS
SET LINE CTRL TO WORD LENGTH
PARITY AND # STOP BITS
ADDRESS INTR ENABLE REG
DISABLE INTERRUPTS (IER)
COM_STATUS
SEND CHARACTER IN (AL) OVER COMMO LINE
AS:
A7:
PUSH
ADD
MOV
OUT
INC
INC
MOV
CALL
JZ
POP
MOV
A8:
A9:
OR
JMP
DEC
MOV
CALL
JNZ
SUB
POP
MOV
OUT
JMP
AX ; SAVE CHAR TO SEND
DX,4 ; ADDRESS MODEM CONTROL REG
AL, DTR_BIT OR RTS_BIT ; SET DTR AND RTS
DX ,AL ; DATA TERM RDY, REO TO SEND
DX ; MODEM STATUS REGISTER
DX
BH, DSR_BIT OR CTS_BIT ; DATA SET RDY & CLR TO SEND
WAILFOR_STATUS ARE BOTH TRUE
A9 YES, READY TO TRANSMIT CHAR
CX
AL,CL
AH ,80H
A3
DX
BH,DSILBIT
WAILFOR_STATUS
A7
DX,5
CX
AL,CL
DX,AL
A3
RELOAD DATA BYTE
INDICATE TIME OUT
RETURN
CLEAILTO_SEND
ADDRESS LINE STATUS REGISTER
IS TRANSMITTER READY
TEST FOR TRANSMITTER READY
NO, RETURN WITH TIME OUT SET
ADDRESS DATA PORT
RECOVER IN CX TEMPORARI L Y
MOV E CHAR TO AL FOR OUT,
STATUS IN AH
OUTPUT CHARACTER
RETURN
RECEIVE CHARACTER FROM COMMO LINE
A12:
ADD
MOV
DX,4
AL,DTILBIT
MODEM CONTROL REGISTER
SET DATA TERM I NAL READY
2-146 ROM BIOS

IBM PC CONVERTIBLE Specifications

General

Brand	IBM
Model	PC CONVERTIBLE
Category	Laptop
Language	English