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ZX Review #5-6
04 ноября 1997 |
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Studies - A set of eight programs of "extension" screen. Two procedures are manifestations of the screen.
(C) Komandin IG, Kaluga
Propose a set of eight
programs, united by a common
purpose. Below we give a brief
characteristics of each program, and then their listings.
PICTH1 - a doubling of
height of the contents of the middle part
screen so that the resulting
image occupies the entire screen;
PICTH2 - doubles by
height of the contents of the upper half of the screen (lines
0-11);
ATTRH1 - the same as PICTH1,
but for the attributes;
ATTRH2 - the same as PICTH2,
but for the attributes;
PICTW1 - a doubling of
width of the image in the center of the screen (columns 8-23);
PICTW2 - a doubling of
width of the image in the left half of the screen (columns
0-15);
ATTRW1 - PICTW1 for attributes;
ATTRW2 - PICTW2 for attributes.
140.
PICTH1 LD B, 48
LD HL, # 40C0
LD DE, # 4000
LOOP PUSH BC
PUSH HL
PUSH DE
LD BC, 32
LDIR
POP DE
EX DE, HL
CALL DOWN
EX DE, HL
POP HL
CALL DOWN
POP BC
DJNZ LOOP
LD B, 48
LD HL, # 5720
LD DE, # 57E0
LOOP1 PUSH BC
PUSH HL
PUSH DE
LD BC, 32
LDIR
POP DE
EX DE, HL
CALL UP
EX DE, HL
POP HL
PUSH HL
PUSH DE
LD BC, 32
LDIR
POP DE
EX DE, HL
CALL UP
EX DE, HL
POP HL
CALL UP
POP BC
DJNZ LOOP1
RET
DOWN INC H
LD A, H
AND 7
RET NZ
LD A, L
ADD A, 32
LD L, A
RET C
LD A, H
SUB 8
LD H, A
RET
UP DEC H
LD A, H
AND 7
CP 7
RET NZ
LD A, L
SUB 32
LD L, A
RET C
LD A, H
ADD A, 8
LD H, A
RET
PICTH2 LD B, 96
LD HL, # 4F60
LD DE, # 57E0
LOOP PUSH BC
PUSH HL
PUSH DE
LD BC, 32
LDIR
POP DE
EX DE, HL
CALL UP
EX DE, HL
POP HL
PUSH HL
PUSH DE
LD BC, 32
LDIR
POP DE
EX DE, HL
CALL UP
EX DE, HL
POP HL
CALL UP
POP BC
DJNZ LOOP
RET
UP DEC H
LD A, H
AND 7
CP 7
RET NZ
LD A, L
SUB 32
LD L, A
RET C
LD A, H
ADD A, 8
LD H, A
RET
ATTRH1 LD B, 6
LD HL, # 58C0
LD DE, # 5800
LOOP PUSH BC
PUSH HL
LD BC, 32
LDIR
POP HL
LD BC, 32
LDIR
POP BC
DJNZ LOOP
LD B, 6
LD HL, # 5A3F
LD DE, # 5AFF
LOOP1 PUSH BC
PUSH HL
LD BC, 32
LDIR
POP HL
LD BC, 32
LDDR
POP BC
DJNZ LOOP1
RET
ATTRH2 LD B, 12
LD HL, # 597F
LD DE, # 5AFF
LOOP PUSH BC
PUSH HL
LD BC, 32
LDIR
POP HL
LD BC, 32
LDDR
POP BC
DJNZ LOOP
RET
PICTW1 LD B, 192
LD HL, # 4000
LD DE, # 4008
LOOP PUSH BC
PUSH HL
PUSH DE
LD B, 8
L3 PUSH BC
LD A, (DE)
LD B, 2
L2 PUSH BC
LD B, 4
L1 RLCA
PUSH AF
RL (HL)
POP AF
RL (HL)
DJNZ L1
INC HL
POP BC
DJNZ L2
INC DE
POP BC
DJNZ L3
POP DE
EX DE, HL
CALL DOWN
EX DE, HL
POP HL
CALL DOWN
POP BC
DJNZ LOOP
LD B, 192
LD HL, # 401F
LD DE, # 4017
LOOP1 PUSH BC
PUSH HL
PUSH DE
LD B, 8
L6 PUSH BC
LD A, (DE)
LD B, 2
L5 PUSH BC
LD B, 4
L4 RRCA
PUSH AF
RR (HL)
POP AF
RR (HL)
DJNZ L4
DEC HL
POP BC
DJNZ L5
DEC DE
POP BC
DJNZ L6
POP DE
EX DE, HL
CALL DOWN
EX DE, HL
POP HL
CALL DOWN
POP BC
DJNZ LOOP1
RET
DOWN INC H
LD A, H
AND 7
RET NZ
LD A, L
ADD A, 32
LD L, A
RET C
LD A, H
SUB 8
LD H, A
RET
PICTW2 LD B, 192
LD HL, # 401F
LD DE, # 400F
LOOP PUSH BC
PUSH HL
PUSH DE
LD B, 16
L3 PUSH BC
LD A, (DE)
LD B, 2
L2 PUSH BC
LD B, 4
L1 RRCA
PUSH AF
RR (HL)
POP AF
RR (HL)
DJNZ L1
DEC HL
POP BC
DJNZ L2
DEC DE
POP BC
DJNZ L3
POP DE
EX DE, HL
CALL DOWN
EX DE, HL
POP HL
CALL DOWN
POP BC
DJNZ LOOP
RET
DOWN INC H
LD A, H
AND 7
RET NZ
LD A, L
ADD A, 32
LD L, A
RET C
LD A, H
SUB 8
LD H, A
RET
ATTRW1 LD B, 24
LD HL, # 5808
DE DE, # 5800
LOOP PUSH BC
PUSH HL
PUSH DE
LD B, 8
LOOP2 LD A, (HL)
LD (DE), A
INC DE
LD (DE), A
INC DE
INC HL
DJNZ LOOP2
POP DE
LD HL, 32
ADD HL, DE
LD D, H
LD E, L
POP HL
LD BC, 32
ADD HL, BC
POP BC
DJNZ LOOP
LD B, 24
LD HL, # 5817
LD DE, # 581F
LOOP3 PUSH BC
PUSH HL
PUSH DE
LD B, 8
LOOP4 LD A, (HL)
LD (DE), A
DEC DE
LD (DE), A
DEC HL
DEC DE
DJNZ LOOP4
POP DE
LD HL, 32
ADD HL, DE
LD D, H
LD E, L
POP HL
LD BC, 32
ADD HL, BC
POP BC
DJNZ LOOP3
RET
ATTRW2 LD HL, # 580F
LD DE, # 581F
LD B, 24
LOOP PUSH BC
PUSH HL
PUSH DE
LD B, 16
LOOP2 LD A, (HL)
LD (DE), A
DEC DE
LD (DE), A
DEC DE
DEC HL
DJNZ LOOP2
POP DE
LD HL, 32
ADD HL, DE
LD D, H
LD E, L
POP HL
LD BC, 32
ADD HL, BC
POP BC
DJNZ LOOP
RET
2
Well that's all. It only remains
add that the program "extension" screen a few slow, so it's
best to use them to shadow the screen, and then transfer the
resulting image in the screen area.
I remember once Sergei Kolotov invited to make a program to
zoom in center of the screen in half, so that
it occupies the entire screen (graphics + attributes). Now, in
order To achieve this effect,
just need to consistently call the procedure PICTH1,
PICTW1, ATTRH1, ATTRW1.
The following two programs that I want to offer - the
procedure display screen. Special interest, in my opinion,
represents the latter procedure. 140.
; (C) ZX-MANIACS
; SPECIAL FOR INFORCOM
BUFF EQU 41000
LD HL, BUFF
LD DE, # 4000
SBC HL, DE
LD (DIFF), HL
140. LD HL, DOWN
LD (MODE), HL
LD HL, # 4000
CALL DRAW
LD HL, UP
LD (MODE), HL
LD HL, # 57E0
CALL DRAW
LD HL, DOWN
LD (MODE), HL
LD HL, # 4100
CALL DRAW
LD HL, UP
LD (MODE), HL
LD HL, # 56E0
CALL DRAW
LD HL, BUFF
LD DE, # 4000
LD BC, 6912
LDIR
RET
DRAW LD B, 47
LOOP PUSH BC
PUSH HL
LD D, H
LD E, L
LD BC, (DIFF)
ADD HL, BC
LD BC, 32
LDIR
POP HL
LD B, 4
PASS DEFB 205
MODE NOP
NOP
DJNZ PASS
POP BC
HALT
DJNZ LOOP
RET
DOWN INC H
LD A, H
AND 7
RET NZ
LD A, L
ADD A, 32
LD L, A
RET C
LD A, H
SUB 8
LD H, A
RET
UP DEC H
LD A, H
AND 7
CP 7
RET NZ
LD A, L
SUB 32
LD L, A
RET C
LD A, H
ADD A, 8
LD H, A
RET
DIFF DEFW 0
; (C) ZX-MANIACS
; SPECIAL FOR INFORCOM
BUFF EQU 41000
LD HL, BUFF
LD DE, # 4000
SBC HL, DE
LD (DIFF), HL
LD B, 0
LOOP PUSH BC
LD C, B
INC B
LD A, B
CP # C0
JR C, M1
LD B, # C0
M1 XOR A
L1 PUSH AF
CALL 8880
CALL PLOT
POP BC
POP AF
DEC C
INC A
DJNZ L1
POP BC
INC B
LD A, B
CP # FF
JR NZ, LOOP
LD B, # BF
LOOP1 PUSH BC
LD A, # BF
SUB B
LD C, # FF
INC B
L2 PUSH AF
PUSH BC
CALL 8880
CALL PLOT
POP BC
POP AF
DEC C
INC A
DJNZ L2
POP BC
DJNZ LOOP1
LD HL, BUFF +1800
LD DE, # 5800
LD BC, # 0300
LDIR
RET
PLOT ADD A, A
ADD A, A
ADD A, A
ADD A, # 46
LD (BITP), A
ADD A, # 40
LD (RESP), A
ADD A, # 40
LD (SETP), A
LD DE, (DIFF)
ADD HL, DE
DEFB # CB
BITP NOP
PUSH AF
SBC HL, DE
POP AF
JR Z, CONT
DEFB # CB
SETP NOP
RET
CONT DEFB # CB
RESP NOP
RET
DIFF DEFW 0
2
Sincerely, ZX-MANIAC.
*
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