Topic - Theory zhurnalostroeniya.

<b>Topic</b> - Theory zhurnalostroeniya.

SoundTrack: (FROSTBITTEN) BY DX-1969 020 498
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(C) dAn!! L / PGC / BDA
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          THEORY ZHURNALOSTROENIYA



   This article is intended for those who wish to try to 
produce our own magazine, but do not know where to start ... 

   First and foremost, need too much "light up"
for without the desire to make a class journal
simply impossible. Immediately necessary to set aside the 
financial side of the second plan and fanatically get down to 
business! The point is not so difficult as laborious. And 
before you "settle" into a favorite assembler need to sit down 
and think about some aspects of this case. You can even on 
paper, for himself, to paint what should be "my"

magazine every detail.

   We will not deal with information
side, and dwell on the purely technical.

   To better understand the things I
slightly opened the structure of the inner
Journal DEJA VU, and the reader thinking, will already be to 
delve into the matter and wind conditions on, and somewhere, 
maybe it will overshadow the idea and then maybe a project born 
of the new edition, which will undoubtedly ruleznym. 

   Let's start ...


                Interface



   Explain what it is, probably not
sense. Importantly - to understand that there must
do not like you want, but as the user wants!
And even more. You have to try to surprise the user and create 
a "punch", which he love, began to respect and live without it 
can not! It is not necessary to explain that the more device 
will interrogate, the better. And, just to give the choice of 
management. Everything should be queried in parallel: 
joysticks, keyboard, mouse, etc. Do not forget to test the 
hardware prior to the survey click on the availability thereof 
devaysa. 

   Be sure to pay attention to both
called "auto-repeat" function by pressing and releasing FIRE. 
Explain, especially than perform the selected user-defined 
function, check out, and let a user key FIRE? I hope it is 
clear what I mean? 


               Memory (RAM)



   Two questions arise: First, the volume
memory on which to calculate the shell;
secondly, the distribution of memory.

   If you donate 48kb, then you have no
will not scold, but to accelerate to kakihto heights is simply 
impossible. 128kb - standard configuration that can and should 
be supported! Especially because it's corporate standard! If 
you feel a forces to support the memory> 128kb, then, of 
course, it's good and it should be done, whether it is 
RAM-drive, or simply to store vital necessary data.


   Again, save the user from selecting the desired 
configuration to it. All tested automatically and informal 
level, imperceptibly for the user.


   Allocates memory so that you can store the text of a maximum
length in a continuous form!

   Example of DEJA VU:



   In the 48th to address # 6000 "sit" data and
object code to the address 38000. With up to 38,000
# FFFF contain buffer that is loaded
Text (no graphics).

   Music - BANK 1. Graphics - BANK'i 3, 4,
6. In BANK'e 7 - standard second screen, Dahle Data: 
screensaver, sprites, the block schedule, etc. 

   Time-critical procedures in place
address # 8000 and below. Loader, text messaging, font, 
variables, etc. place to address # 8000! 

   Do not forget about the mode IM2, the vector must be in the 
range # 80 to # BF. Also remember about 257 bytes

for machines with unstable data bus.

   In the extended memory "sit" different
"Raskryunchennye" procedure and schedule (frame-scroller, 
screen saver, shooter sprites, etc.). 


              Text Format



   Standard GOST - an alternative encoding for "implanted" 
control codes. Color management (code 16), then Byte attributes 
sprites (code 15), further options sprite: location, length, 
etc. With the support of saving text to disk, do not forget it 
"dry." 


                  Music



   How do you want, but if you all
music compiled in PT 3.01, it suffices to use one player for any
Mouzon STP, PT, ST! When podgruzku text
music "jamming." And in general, give the user the ability to 
enable or disable the music! The new fashion - is a choice any 
melody and no music anchor to a particular text. By the way, if 
you not enough music, and sufficient information

then we can release the magazine though, with 3 tunes.

   How is it done? A very simple!
There is a certain procedure (call it MUZNEXT),
when you call it is loaded into the next Mouzon
accordance with the table (and, if the music is turned off, the 
load and do not - why waste time and drive wear;)). A plate, 
approximately, is this: 


        SONG1 DEFB SEC1 TRK1 SIZE1

        SONG2 DEFB SEC2 TRK2 SIZE2

        SONG3 DEFB SEC3 TRK3 SIZE3

        DEFB 255; mark the end of the table


   Substitute the data in accordance with the directory drive: 
track, sector length. 


                  LOADER



   Importantly, to ship! But turbo-loader still nice!

   Be sure to Install the loader on the drive from which you 
started the magazine (A, B, C, D). Also, be aware that not all 
loaders are working in turbo mode! 

   If the survey error TR-DOS is not done, then at least try to 
get by pressing BREAK or when there is no disk in the drive 
track is not left hanging! 


                  VIEWER



   80% success! The most important thing - how can
faster. Reduce by any means all sorts of blinking and 
twitching. And absolutely Lazha - is when in 128 mode, text 
propechatyvaetsya completely in front of the user! Include an 
alternate screen. If the interface on an "arrow", then take 
care of a survey of "hot" keys! 


                   FONT



   Legible! 32, and preferably 42 characters in
line. 64 characters - in exceptional cases and only for 
listings. Avoid any distortion in the fonts (Gothic, italic, 
propyl). 


             Packing data



   The stronger zakryunchim, the more "vpihnem" on the disc - 
it's a goat and clear! Find a packer, which allows you to save 
the compressed files without depakera. Keeping data without 
depakera you, firstly, complicates the hacking, and secondly, 
save about 1 sector for each file (and there you have a lot)!

Also look at the time of unpacking - the
sooner the better. At Scorpion'ah can
include turbo: LD A, # 7F; IN A, (# FD). Disabled since: LD A, 
# 1F; IN A, (# FD). 



              zE Optimization



   What is the optimal code? This is when
code takes up little space and works fast.
Use a plate. For example, there is no need for everyone to 
write your text loader! Doing so:



    CALL LOADER
TAB DEFB SEC, TRK; track and sector for the text

    DEFB SEC, TRK; track and sector for the music

    DEFB 13; Bank

    DEFB SEC, TRK; track and sector graphs

    DEFB 14; Bank

    DEFB SEC, TRK; track and sector graphs

    DEFB 255; marker

    ... A continuation of the program


   I explain. Call the loader, the stack is postponed the 
return address to the address TAB. The first thing we remove 
the address from the stack and in accordance with the tablet 
will ship files until we reach the marker. By the way, BANK

for the text is always # 10, for music - # 11
therefore, the plate may be omitted, the loader itself "knows" 
where they were shipped. 

   We are looking for the address at which is 255 and
transfers control to the ADR +1 (JP (IX +0), or
JP (HL)). Thus it is possible, for example,
window to draw. Call WINDOW, and the stack
remove the address from which the stored coordinates and text 
on the print! 

   Do not spend on the job variable:


  Standard Optimum


BYTE DEFB 0 MET LD A, 0

     LD A, (BYTE) LD A, B

     LD A, B LD (MET +1), A

     LD (BYTE), A ...

     ...



   And anyway, give yourself installation to optimization, 
think about how to save more! Indeed, as the proverb says - any

protsedurku can be reduced by at least
1 byte.


              Catching bugs!



   Another proverb says that
in any program there is a glitch. I'd add, if no glitches, the 
program itself there is a big glitch! And another idea, each 
caught a glitch raises two other, but this is debatable!


   What to do with glitches? There is much more interesting 
than fishing! First glitch to be found, and then catch it. Good 
will "bite" if the fish are not on the same machine on which to 
write programs. For example, you write on Scorp'e - catch on 
PROFI; write on PROFI - catch on Pentagon'e etc. 

   If a bug is found, and catch it fails, you can try to get 
around it in software, although it may cause new bugs! 


                 RELEASE!



   This is certainly the most pleasant in zhurnalomeykerstve! 
When the magazine is ready and all the glitches caught, it's 
time to gather all those who participated (in every sense of 
the word). If the winter, the apartment, the summer-on nature. 
Good Zatar all necessary and implement the most savage way 
RELEASE! If this is the first number, then these things called 
the presentation! In this process, need to say nice words to his

address because a beneficial effect on digestion. And only 
after you feel RELEASE zhurnalostroeniya great benefit and will 
feel fine, at least until the morning ... ;)