ZX Review #7-8-9-10 08 ноября 1997

Studies - Program the output image.

(C) Zhilenkov Sergei, Murmansk
reg., pos.Vidyaevo


   I suggest you one of their "lighter", which is quite
effectively displays a picture placed in the buffer - the 
screen slides apart left and right from the center with a step 
equal familiarity (the action is carried out simultaneously 
with the graphics and attributes), and if you make it to the 
screen was already an image, it also moved apart, until it 
disappears behind the screen edges (as in the program "Doors" - 
ZX REVIEW 93, p.121). Program relotsiruema and takes only 56

bytes. Type in - you will not regret!
140.
BUF EQU 40056
; Buffer address


        LD C, 16
L0 LD HL, 16385

        LD B, 216

        HALT
L1 PUSH BC

        LD BC, 15

        PUSH BC

        PUSH HL

        POP DE

        DEC DE

        LDIR

        POP BC

        ADD HL, BC

        PUSH HL

        POP DE

        DEC HL

        LDDR

        POP BC

        PUSH BC

        PUSH HL

        LD DE, BUF-16383

        ADD HL, DE

        LD B, 0

        SBC HL, BC

        LD E, (HL)

        DEC HL

        ADD HL, BC

        ADD HL, BC

        LD D, (HL)

        POP HL

        LD (HL), E

        INC HL

        LD (HL), D

        LD DE, 17

        ADD HL, DE

        POP BC

        DJNZ L1

        DEC C

        JR NZ, L0

        RET


           *