IBM PC CONVERTIBLE Technical Reference page 126

057E
057E 8A C7
0580
0580 E8 05AC R
0583 81 EF 2050
0587 FE CB
0589 75 F5
058B FC
058C E9 016F R
058F
058F 8A DE
0591 EB EB
0593
0593
0593 8A CA
0595 56
0596 57
0597 F3/ A4
0599 5F
059A 5E
059B 81 C6 2000
059F 81 C7 2000
05A3 56
05A4 57
05A5 8A CA
05A7 F3/ A4
05A9 5F
05AA 5E
05AB C3
05AC
05AC
05AC 8A CA
05AE 57
05AF F3/ AA
05Bl 5F
0582
81 C7 2000
05B6 57
05B7 8A CA
05B9 F3/ AA
05BB 5F
05BC C3
05BD
R14:
MOV
AL, BH
R15:
CALL R18
SUB D I ,2000H+80
DEC BL
JNZ R15
CLD
JMP VIDEO_RETURN
R16 :
MOV BL,DH
JMP R14
GRAPH I CS_DOWN ENDP
ROUTINE TO MOVE ONE ROW OF
R17 PROC NEAR
MOV CL, DL
PUSH SI
PUSH
DI
REP MOVSB
POP DI
POP SI
ADD SI,2000H
ADD DI,2000H
PUSH SI
PUSH DI
MOV CL,DL
REP MOVSB
POP DI
POP SI
RET
R17 ENDP
CLEAR A SINGLE ROW
RIB PROC NEAR
MOV CL, DL
PUSH DI
REP STOSB
POP DI
ADD DI,2000H
PUSH DI
MOV CL, DL
REP STOSB
POP DI
RET
R18 ENDP
CLEAR_ENTRLDOWN
ATTRIBUTE TO FILL WITH
CLEAR_LOOP _DOWN
CLEAR A ROW
POINT TO NEXT LINE
NUMBER OF LINES TO FILL
CLEAR_LOOP _DOWN
RESET THE DIRECTION FLAG
EVERYTHING DONE
BLANILFI ELD_DOWN
SET BLANK COUNT TO EVERYTHNG
IN FIELD
CLEAR THE FI ELD
I N FORMA TI ON
NUMBER OF BYTES IN THE ROW
SA V E PO INTERS
MOVE THE EVEN FI ELD
POINT TO THE ODD FIELD
SAVE THE POINTERS
COUNT BACK
MOVE THE ODD FI ELD
POINTERS BACK
RETURN TO CALLER
NUMBER OF BYTES IN FI ELD
SAVE POINTER
STORE THE NEW VALUE
POINTER BACK
POINT TO ODD FIELD
FILL THE ODD FILELD
RETURN TO CALLER
GRAPHICS WRITE
ENTRY
EXIT
THIS ROUTINE WRITES THE ASCI I CHARACTER TO THE
CURRENT POSITION ON THE SCREEN.
AL
=
CHARACTER TO WRITE
BL
=
COLOR ATTRIBUTE TO BE USED FOR FOREGROUND COLOR
IF BIT 7 IS SET, THE CHAR IS XOR'D INTO THE REGEN
BUFFER (0 IS USED FOR THE BACKGROUND COLOR)
CX
=
NUMBER OF CHARS TO WRITE
OS
=
DATA SEGMENT
ES
=
REGEN SEGMENT
NOTHING IS RETURNED
FOR THIS ROUTINE, THE IMAGES USED TO FORM CHARS ARE CONTAINED
IN ROM.
ROM BIOS 2-101