IBM PC CONVERTIBLE

08BC
08CO
08C2
08C4
08C8
08CA
08CC
08CE
08D2
0803
08D4
08D5
08D6
08D8
08D8
08DB
08DE
08EO
08E4
08E5
08E5
08E7
08E9
08EA
08EB
08EC
08 ED
08EF
08F3
08F5
08F7
08F9
08FC
08FE
08FF
0903
0906
0908
090C
090E
090F
090F
090F
0910
0912
0914
0915
0917
0918
09lA
091C
----- WRITLTTY IS CALLED TO PROCESS THE SPECIAL CHAR. WRITE_TTY WRTS
TO THE CURRENT ACTIVE PAGE DEFINED BY GLOBAL VAR ACTIVE_PAGE.
WRITLSTRING WRITES TO THE PAGE DEFINED BY USER IN BH REGISTER.
THE ACTIVE_PAGE VARIABLE MAY NOT BE SAME PG AS DEFINED BY USER
IN BH REGISTER. THE ACTIVE_PAGE VAR MUST BE TEMP SET TO
86 3E 0062 R
B4 OE
CD 10
86 3E 0062 R
8A DF
32 FF
01 E3
8B 97 0050 R
07
58
5B
59
EB 37
B9 0001
80 FC 02
72 05
26: 8A 5E 00
45
B4 09
CD 10
07
58
5B
59
FE C2
3A 16 004A R
72 1A
FE C6
2A D2
80 FE 19
72ll
50
86 3E 0062
B8 OEOA
CD 10
86 3E 0062
FE CE
58
50
B4 02
CD 10
58
E2 8A
5A
3C 01
74 08
3C 03
BH REGISTER BEFORE CALLING WRITE_TTY. AND, BOTH ACTIVE-PAGE AND
BH REGISTER MUST BE RESTORED AFTER.
XCHG
ACTIVE_PAGE,BH TEMPORARILY EXCHANGE VALUES
MOV
AH, WRITE_TEL ETYPE WRITE TTY CHAR TO THE ACT PG
INT VIDEOJN INT 10H
XCHG ACTIVE_PAGE, BH RESOTRE VALUES
MOV BL, BH GET CURRENT CURSOR POSITION
XOR BH, BH
SAL BX ,I
; INTO THE OX REGISTER
MOV DX, [BX+OFFSET CURSOILPOSN]
POP ES
POP AX ; RESTORE REGISTERS
POP BX
POP CX
JMP
SHORT ROWS_SET
GELATTRIBUTE:
MOV CX ,I SET CHAR WRITE AMOUNT TO ONE
CMP AH,2 IS ATTRIBUTE IN THE STRING
JB GOLIT I F NOT THEN JUMP
MOV BL,ES: [BP] ELSE GET IT
INC BP BUMP STRING POINTER
GOLIT:
MOV AH, WR ITE_ATLCHAR WRITE CHAR AND ATTRI BUTE
INT VIDEO_FN
POP ES
POP AX
RESTORE REGISTERS
POP BX
POP CX
INC
DL ; INCREMENT COLUMN COUNTER
CMP
DL, BYTE PTR CRLCOLS ;. I F COLS ARE I N RANGE FOR
THIS MODE THEN
JB
COLUMNS_SET GOTO COLS SET
INC DH
BUMP ROW COUNTER BY ONE
SUB DL,DL
SET COLUMN COUNTER TO ZERO
CMP DH,25
I F
ROWS ARE < 25 THEN
JB
ROWS_SET
GOTO ROWS_SET
WRITLTTY IS CALLED TO PROCESS SCROLL LINE CMD. WRITE_TTY WRITES
TO THE CURRENT ACTIVE PAGE DEFINED BY GLOBAL VARIABLE ACTIVE_PAGE.
WRITE_STRING WRITES TO THE PAGE DEFINED BY USER IN BH REGISTER.
THE ACTIVE_PAGE VARIABLE MAY NOT BE THE SAME PAGE DEFINED BY USER
IN BH REGISTER. ACTIVE_PAGE VARIABLE MUST BE TEMPORARILY SET TO
BH REGISTER BEFORE CALLING WRITLTTY. AND, BOTH ACTIVE-PAGE AND
BH REGISTER MUST BE RESTORED AFTER.
PUSH
AX SAVE WRITE STRING PARM REGS
XCHG
ACTIVE_PAGE,BH ; TEMPORARILY EXCHANGE VALUES
MOV AX,WRITE_TELETYPE*256+0AH ; SCROLL 1 LINE
INT
VIDEO_FN
FEED COMMAND TO WRITE TTY FN
XCHG
ACTIVE_PAGE, BH
RESTORE TO ORIG VALUES
DEC DH RESET ROW COUNTER TO 24
POP AX RESTORE REG'S
ROWS_SET:
COLUMNS_SET:
PUSH AX SAVE WRITE STRING OPTION
MOV AH, SELCURSOR_POS SET NEW CURSOR POSITION
INT
VIDEO_FN
AND RESTORES VIDEO PAGE
POP AX
LOOP
WRITE_CHAR
DO IT UNTIL CX = ZERO
POP DX RESTORE OLD CURSOR COORDIN
CMP
AL,l
I F CURSOR WAS TO BE MOVED
JE DONE
WE'RE DONE
CMP AL,3
ROM BIOS 2-111