Hacker tips for beginners
(C) T.A.W. / JUPITER 77
Hello Young Hacker! It's me again T.A.W. and this time I
tell you (in a live example) as in game programs do
account records, and status (but never do so shipment status in
the games genre ADVENTURE) to disk.
As an example, consider a game made by ACE CASCADE
GAMES in 1986.
It is a procedure for shipment of records from the address
35501, and boot from the addresses of 30,963. Length of 160
bytes of paged unit.
And now I present assembly code of the new procedures save /
working without load system variables.
Tagged Under DRIVER driver itself will work with the disk
and which can be used for any purpose.
ORG 65319
LD HL, 35000
LD B, 1
CALL DRIVER
LD IX, 23296
JP 30716
DRIVER DI
LD DE, 0
LD IX, # 2F65
CALL DOS
L_06 PUSH BC
LD C, D
SRL C
DRV LD A, 0
JR NC, L_01
OR # 2C
JR L_02
L_01 OR # 3C
L_02 LD IX, # 2F4D
CALL DOS
POP BC
L_05 PUSH DE
PUSH BC
LD IX, # 2F1B
BIT O, C
JR NZ, L_03
LD IX, # 2D73
L_03 CALL DOS
POP BC
POP DE
INC H
INC E
BIT 4, E
JR NZ, L_04
DJNZ L_05
JR EXIT
L_04 LD E, 0
INC D
DJNZ L_06
EXIT EI
RET
DOS PUSH IX
JP # 3D2F
DEFM "THIS DISK DRIVER WRITTEN BY CHAOS A.D."
In the main block game using STS put at SAVE
/ 35 501 /:
LD C, 6
JP 65319
and to the address LOAD / 30 963 /:
LD C, 5
JP 65319
At (DRIVER +2), store the variables from the 23796/97, and on
address (DRV +1), store the variable of 23,798. But it's done
after downloading the program, which will have the form
BASIC -???
CODES1-acec1, 23296,256
CODES2-acec2, 25000,40535
CODES3-record, 35000,256 / write out of the game in STS'e /
After downloading CODES2 vyshenapisannuyu follow the
instructions.
I hope that now you will be able to freely make such
things in programs.
The annex will include:
1) assembly code for assembler DRIVER ALASM.
2) Game NIGEL MANSEL'S GRAND PRIX (tailor with this driver).
3) Tape version of the game ACE 1.
To contact the editorial office POWER.
