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IBM PeraQ,...1 Computer MACRO Assembler
Veraion 2.00
• -1
VIDEOI
--- 06/10/85
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OU1
OX,AL
TURN OFF Y IDEO OUR I NG VERT I CAL RETRACE
POP
OX
N9:
POP
AX
RESTORE LINE COUNT
OR
BL,BL
o
SCROLL MEANS BLANK FIELD
RE1
RETURN
II
I TH FLAGS SET
SCROLL_POS I T I ON ENDP
1-----
MOVE ROW
N I 0
PROC-
NEAR
MOV
CL,DL
GET /I OF COLS TO MOVE
PUSH
S I
PUSH
0 I
SAVE START ADDRESS
REP
MOVS.
MOVE THAT LINE ON SCREEN
POP
01
POP
SI
RECOVER ADDRESSES
RE1
NIO
ENOP
;-----
CLEAR ROW
Nil
PROC -
NEAR
MOV
CL.oL
I GET /I COLUMNS TO CLEAR
PUSH
01
REP
STOSW
STORE THE FILL CHARACTER
POP
01
RET
Nil
ENoP
SCROLL DOWN
THIS ROUTINE MOVES THE CHARACTERS WITHIN A DEFINED
BLOCK OOWN ON THE SCREEN , FILLING THE TOP LINES
¥II I TH A DEF I NED CHARACTER
INPUT
(AH)
=
CURRENT CRT MODE
(All
=
NUM8ER OF LINES TO SCROLL
(CX)
=
UPPER LEFT CORNER OF REGION
(OX)
=
LOWER RIGHT CORNER OF REG I ON
(8H)
=
FILL CHARACTER
(OS)
=
DATA SEGMENT
(ES)
=
REGEN SEGMENT
OUTPUT
NONE -- SCREEN
I
S SCROLLED
~~~~~~
-
~~;~
- - - - -
~~;;
-- - -
~~~~
- - - - - -
-
- -
---
-
STo
I DIRECTION FOR SCROLL DOWN
CALL
TEST LINE COUNT
I
CMP
AH,4-
-
I TEST FOR GRAPHICS
JC
N( 2
eMP
AH,7
TEST FOR BW CARD
JE
N!2
JMP
GRAPH I CS_DOWN
N12:
CONT I NUE DOWN
PUSH
BX
SAVE ATTR I BUTE
IN BH
NOV
AX,OX
LOWER RIGHT CORNER
CALL
SCROLL_POS I TlON
GET REGEN LOCA T [ON
"Z
NI.
SUB
SI,AX
S I
I S FROM ADDRESS
NOV
AH,oH
GET TOTAL ,
ROWS
SUB
AH,BL
COUNT TO MOVE
1N SCROLL
N 13:
CALL
NIO
MOVE ONE ROW
SUB
SI,8P
SUB
OI,8P
OEe
AH
"NZ
NI3
N14:
POP
AX
I
RECOVER A TTR 18UTE IN AH
NOV
AL, '
N15:
CALL
Nil
CLEAR ONE ROW
SUB
DI,BP
GO TO NEXT ROW
OEe
BL
"NZ
NI5
""P
N5
Nib:
NOV
8L , OH
""P
NI'
SCROLL DOWN
ENDP
-
;-----
IF
AMOUNT OF LINES TO BE SCROLLED", AMOUNT OF LINES IN WINDOW
;-----
THEN
ADJUST AL; ELSE
RETURN,
TEST_LINE_COUNT PROC
NEAR
NOV
BL,AL
SAVE LINE COUNT IN BL
OR
AL,AL
TEST IF AL I S ALREADY ZERO
"Z
AX
BL SET
IF
IT IS THEN RETURN •••
PUSH
SAVE AX
NOV
AL,DH
SUBTRACT LOWER ROW FROM UPPER ROW
SUB
AL,CH
.Ne
AL
ADJUST DIFFERENCE BY
I
e"p
AL , 8L
LINE COUNT", AMOUNT OF ROWS IN WINDOW?
POP
AX
RESTORE AX
"NE
BL SET
I F NOT THEN WE' RE ALL SET
SUB
8L-;-BL
OTHERWISE SET 8L TO ZERO
RET
RETURN
TEST_LiNE_COUNT ENDP
VIDEO1
5-149
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