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ZX Review #7-8-9-10
08 ноября 1997 |
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Forum - ZX Spectrum emulator for IBM. About the hexadecimal system. Program ZX-Stars. Oddities in the Elita
(C) Kashnikov V., Samara Region.,
g.Kinel
I'll start with a bit of a forgotten game -
ELITE.
1) As Double
stars, then I have some
doubts about their "dvoichnosti.
As you know, a double star -
it's two suns, which revolve around a common center of mass. A
in fact: I fly to the planet, and instead of two suns there are
only two Coriolis or dodecahedron - just two stations. I'm 99%
sure that the world's two stations, if the compass is straying,
and it there is another circle, or
square (usually the left side of the compass). When approaching
a station as usual, and when approaching another start
manifest various oddities:
no signal S, the station
may be far from the planet, or nearly so above the surface,
there were other minor details (for example, the inlet is
directed away from the planet). True, I did not understand the
system, how to find one or another station.
2) After I read
Book by E. Kaufman "Space
boundaries of the theory of relativity "
1981, I went into their
theory about the planet RAXXLA. Black
hole? - A new idea, or not really new? Judging by the written
in the book, from the black hole you can get from (-) infinity
to (+) infinity in time. Or maybe you can out of it
go to RAXXLA? Main -
only to find it. But do not run away - because in the first
mission, the sun explodes, and who knows what will happen to
him on Over time - a white dwarf or a black hole, or even
something. So, in essence: you become ELITE - wind to the
planet where the first mission to fulfill, and will
investigate. There.
3) When the screen goes circles during the flight to another
planet, then both Q + O + C + A. Try to predict what
will! And now download the game and
check, then read on. Well? That's right, nothing
happened. Ha-ha! Then all
honestly. Download the game. Tune in to a flight to another
planet. Off and at full speed, flying toward the planet. When
height would be minimal and red light will blink
press C, further experiment and read on. I pressed the H and
"Happy Feet" to another planet. After this has not worked up
control of the ship, down, left, right, and the rest
worked fine. He flew so
I read a version of "M1 loading",
although he moved on to "M128".
Now just add-on.
First mission to the M128 give much later than in M1. Net time
I have played at least five days, and the job was never
received. Time in this version stations are not going as well
in version M1 loading time goes on everywhere. By
my estimation of the time meet bytes 94-102, and for what
Need 103 and 104 - is unclear, but
it is suspected that this, too
time. I have no floppy drive,
therefore have to settle for old versions of ELITE,
and so want to "rubanutsya in
ELITE-2!
The next question focuses on
ZX-Spectrum emulator for IBM.
I wanted to try to edit the font in the game ACADEMY using
FONTEDIT, but it font is not found. Manual search also gave
nothing. Perhaps emulator compresses data, and then write? If
yes, You can disable this or not?
Since my last letter I sent you their program ZX-STARS,
Now send her away, but a bit optimized. Ticks
marked differences between the versions. Hence the question -
is the program different versions or different editorial? If
you can, then tell me in which cases the version number is in
the public - Editorial (preferably with specific examples). And
in general, may I put (c) in this program? Indeed, almost half
of the program was not written by me but by other authors (RND
procedures and PLOT).
I decided to try "sbatsat"
Program Life, which you
previously mentioned. And figured
decided that the basic procedures are procedures for survival
and death at the same time, and the procedure was born. Get
everything except for birth - no trying to figure out how to do
it. Maybe you help?
With regard to the hexadecimal number system, then I did
barely digested. But it became
much easier when I had a scientific calculator
Citizen, which can translate numbers in HEX, DEC, BIN, OCT
system, and also has some additional features. Surely, you know
where applicable vosmerichnayaV (OCT) Vsistema - I
I do not know. HEX-system, in my
opinion, is inconvenient because of ambiguities
address # A528, and because it is unclear where the program.
If there was a command SAVE "name"
CODE # A528, nn, then everything would have been
better. Although HEX-system is
and its advantages. For example,
immediately clear what the numbers are in
register pair (LD HL, 16384 and
LD HL, # 4000). For myself, I decided
that the use of any system - a matter of practice.
Program listing ZX-STARS:
140.
; ZX-STARS Version 1.2
3 (C) Vladimir Kashnikov 07/20/1996
ORG 58210
SEED EQU 23672
LD HL, # 4000
LD DE, 58622
LD BC, 6912
LDIR
XOR A
OUT (# FE), A
LD HL, # 4000
LD (HL), A
LD DE, # 4001
LD BC, 6143
LDIR
LD A, 7
LD HL, 22528
LD (HL), A
LD DE, 22529
LD BC, 767
LDIR
RES 5, (IY +1)
LD HL, 58420
LD B, 101
P0 PUSH BC
LD C, (HL)
INC HL
LD B, (HL)
INC HL
PUSH HL
CALL PLOT
POP HL
POP BC
DJNZ P0
BEG LD HL, 58420
PUSH HL
CALL RND
LD A, D
P1 CP 101
JR C, CON1
SUB 100
JR P1
CON1 ADD A, A
POP HL
ADD A, L
LD L, A
PUSH HL
LD C, (HL)
INC HL
LD B, (HL)
CALL PLOT
CALL RND
LD A, E
CP 192
JR C, CON2
AND 192
CON2 POP HL
LD (HL), D
INC HL
LD (HL), A
LD B, A
LD C, D
CALL PLOT
BIT 5, (IY +1)
JR Z, BEG
LD A, (23624)
SRL A
SRL A
SRL A
OUT (# FE), A
LD HL, 58622
LD DE, # 4000
LD BC, 6912
LDIR
RET
RND LD HL, (SEED)
LD A, H
OR L
JR NZ, NOZERO
INC L
NOZERO LD A, L
RLCA
XOR H
RLCA
RLCA
XOR H
RLCA
XOR H
RLCA
ADC HL, HL
LD (SEED), HL
EX DE, HL
RET
PLOT LD A, 191
SUB B
LD B, A
AND A
RRA
SCF
RRA
AND A
RRA
XOR B
AND # F8
XOR B
LD H, A
LD A, C
RRCA
RRCA
RRCA
XOR B
AND # C7
XOR B
RLCA
RRCA
LD L, A
LD A, C
AND # 07
LD B, A
INC B
LD A, # FE
LOOP RRCA
DJNZ LOOP
LD D, # FF
XOR D
LD B, A
LD A, (HL)
XOR B
LD (HL), A
RET
; ZX-STARS Version 2.1
3 (C) Vladimir Kashnikov 09/09/1996
ORG 58210
SEED EQU 23672
LD HL, # 4000
LD DE, 58622
LD BC, # 1B00
LDIR
XOR A
OUT (# FE), A
LD HL, # 4000
LD (HL), A
LD DE, # 4001
LD BC, # 17FF
LDIR
LD A,% 111
INC HL √
LD (HL), A
LD DE, # 5801
LD BC, # 02FF
LDIR
RES 5, (IY +1)
LD HL, 58420
LD B, 101
P0 PUSH BC
LD C, (HL)
INC L √
LD B, (HL)
INC L √
PUSH HL
CALL PLOT
POP HL
POP BC
DJNZ P0
BEG LD HL, 58420
PUSH HL
CALL RND
LD A, D
P1 CP 101
JR C, CON1
SUB 100
JR P1
CON1 ADD A, A
POP HL
ADD A, L
LD L, A
PUSH HL
LD C, (HL)
INC L √
LD B, (HL)
CALL PLOT
CALL RND
LD A, E
CP 192
JR C, CON2
AND 192
CON2 POP HL
LD (HL), D
INC L √
LD (HL), A
LD B, A
LD C, D
CALL PLOT
BIT 5, (IY +1)
JR Z, BEG
LD A, (23624)
SRL A
SRL A
SRL A
OUT (# FE), A
LD HL, 58622
LD DE, # 4000
LD BC, 6912
LDIR
RET
RND LD HL, (SEED)
LD A, H
OR L
JR NZ, NOZERO
INC L
NOZERO LD A, L
RLCA
XOR H
RLCA
RLCA
XOR H
RLCA
XOR H
RLCA
ADC HL, HL
LD (SEED), HL
EX DE, HL
RET
PLOT LD A, 191
SUB B
LD B, A
AND A
RRA
SCF
RRA
AND A
RRA
XOR B
AND # F8
XOR B
LD H, A
LD A, C
RRCA
RRCA
RRCA
XOR B
AND # C7
XOR B
RLCA
RRCA
LD L, A
LD A, C
AND # 07
LD B, A
INC B
LD A, # FE
LOOP RRCA
DJNZ LOOP
LD D, # FF
XOR D
LD B, A
LD A, (HL)
XOR B; inversion of the pixel
LD (HL), A
RET
2
Ed.: As for number systems. We
also believe that the use of a
radix - purely a personal matter
programmer. After all, he wrote the source code for
themselves and not for someone, so you need them
to write as it is convenient to him.
Naturally, the source code, which go on
general considerations (for example, in our
magazine), should be easy to read and understand, but here,
too, should not say that the decimal number system only
pomeha.VNaprimer, esliVtsiklVnado repeated 2000 times, then LD
BC, 2000 will be look clearer than LD BC, # 07D0. A
If we load the B number 3, and C - 6
in this case would be clearer LD
BC, # 0306. So what sorts of skirmishes on the
this topic, we believe just as meaningless as the skirmish on
the topic "what is better - QWERTY or YAVERTY. "Unfortunately,
this kind of squabbles have become very common, although there
is in our opinion, it is worth recalling the proverb "the taste
and color mates there. "Surely the programmers so
difficult to make a removable table keys as
in the ZX-WORD?
Now, regarding the strange plants in
ELITE. I, the editor of this paper, also once faced with the
phenomenon. I saw a station that was almost the planet's
surface to the entrance, directional from it. I fly into it
could not - I collided with the planet. We believe that the
phenomena of this kind - it's a bug of the program. You can
even try to explain the mechanism his education. So when are we
going to planet in the right direction, we see the planet and
the station at some distance from it. Now imagine we flew to
the planet in a diametrically the opposite point. Advised to
also pay attention to one important fact - all objects in the
game are transparent, through them all seen. And, flying close
enough to planet, we can see the station, located on the
opposite side of the planet. Naturally, we'll see her entrance
to her, ie as if directed from the planet. Can
even catch a signal S (which was then with
I). Now imagine that due to
Some features the planet's surface as it moves, resulting in
the station can be even sit. There you are, another station on
the planet's surface to the input directed to it. This
conjecture even once been tested experimentally. Broke so I
uploaded the old state and repeated the flight. As expected,
while approaching the planet signal has been received S, which
went directly from its center. I became fly around the planet,
being oriented so that the signal was always on the left. After
a while I saw a normal station, which, without any weirdness
could fly into.
*
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