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ZX Review #3-4
22 июля 1997 |
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Studies - M. Lazutov: The modernization program font. Program encode / decode block codes. The effect of the attributes.
(C) Lazutov M., 1996
g.Tuchkovo, MO
This program of modernization of the font was "pulled" from
Boot to the game "DAM Busters"
140.
ORG 40000
LD DE, 41000
LD HL, 15616
PUSH DE
LD BC, 768
LDIR
POP HL
PUSH HL
LD B, 96
M2 PUSH BC
LD B, 4
INC HL
INC HL
INC HL
INC HL
M1 LD A, (HL)
LD C, A
SLA A; can be replaced
; At SRA A
OR C
LD (HL), A
INC HL
DJNZ M1
POP BC
DJNZ M2
POP HL
DEC H
LD (23606), HL
RET
2
I also propose that the simplest
program that "encodes"
block codes, and when called again - decodes.
140.
LD HL, START; Initial
; Address encoded block.
LD BC, LEN; Length
; Encoded block.
M1 LD A, (HL)
CPL
LD (HL), A
INC HL
DEC BC
LD A, B
OR C
JR NZ, M1
RET
And this creates the effect of
attributes:
ORG 40000
ENT $
CALL 3435
M0 LD HL, 22528
LD DE, 768
M1 LD A, (23560)
CP 1932
RET Z
LD A, (HL)
OUT (254), A
INC A
RRC A
RRC A
XOR L
LD (HL), A
INC HL
DEC DE
LD A, D
OR E
JR NZ, M1
JR M02
; ATTR EFFECT
; BY MAXSOFT
; (C) 1996
********************************
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