Programmers - Chunks on the curb.

MULTICOLOR AND CHUNKS ON THE BORDER 
                                         
(C) Nikolay Vitenko (VNN)                
(C) Denis Tokarczuk (DWT)                 
    K.S.SoftWare                         
-------------------------------------------------------
 The beginning of the story         
                                         
   One bright winter evening in 1999
yes, when there was a white snowball on the ground, I
(DWT) was sitting in ZASM and preparing the next
codes for a failed project called
"ZX-Press #2". (Quit ZASM! Pe-
go to ALASM, since you have increased your memory in
computer Note. ed.)Yawning again and
Having opened my eyes, I noticed how my
dem LED - it meant that someone
the other end of the line is calling me. Not
for a long time I load the terminal MMD v2.20
and I observe several interesting phenomena in
the process of docking and reading the catalog. B
once again happy for us, "pro-
advanced" computer scientists of the native Carlo-
Marksovo (we have telephone linesterrible,
therefore, happiness to communicate in real-time mode
Not everyone has a me-terminal, but we have
spektrumistov, a special line that
we did it ourselves (!!!!), I typed the following -
more:                                     
   "Who's there?"                            
   To which they answered:                  
   "This is VNN. Hello, Denis! I'm here for something
I made it, if you want, I’ll throw it off. You'll be surprised
very much, I promise."                        
   “Another multicolor on the border?”, -
Yawning again, I typed on the keyboard.  
   "Almost, but this is something new!"          
   I'm wary - if VNN says that
new means it's really NEW! On
it's worth watching.  In short, VNN dropped
I need MASM's source code...              
                                         
            Get to the point             
                                         
 After a short lyrical digression,
Now let's start looking at the IDEAS of the effect
in detail. And it's not that complicated - how
they say: “the devil is not so terrible...”.     
                                         
   It all comes down to the fact that different colors
vye connections (color combinations) through
each interrupt is switched (approx.
the same as with two screens or jersey
lore, though it’s more difficult to implement - ri-
poking on the curb is not as easy as on
normal screen).Naturally, the frequency
Switching colors affects the frequency of measures
zaniya, which, of course, is not very pleasant
for the eyes :(                             
                                         
   Now let's do some math. Because on boron
dur you can display colors from a palette of 8,
then using the above method is very
It's quite easy to get 64 colors using
overlay in two color combinations. Name-
but this is what we will consider (it should be said about
side properties of this effect: shift
nuv one of the color combinations for 2 so-
ta (on the border, 1 tick is equal to 2 pixels)
we “cut off” exactly 4 pixels and get
a kind of chunk point that can be used
call in chunk effects.                  
                                         
   Now, actually, about the algorithm. New
Let's talk about the general scheme:                   
                                         
     +---------------------------------+   
     |Place in register pair NN|   
  +->+block address color. combinations 1 |   
  |  +--------------+----------------+   
  |                 |                    
  |      +----------+----------+         
  |      |Displaying the block to the curb|         
  |      +----------+----------+         
  |                 |                    
  |             +---+--+                 
  |             | HALT |                 
  |             +---+--+ |                 |                    
  |  +--------------+----------------+   
  |  |Place in register pair NN|   
  |  |color block address. combinations 2 |   
  |  +--------------+----------------+   
  |                 |                    
  |      +----------+----------+         
  |      |Displaying the block to the curb|         
  |      +----------+----------+         
  |             +---+--+                 
  |             | HALT |                 
  |             +---+--+                 
  +----------<-----------+                    
                                         
  The algorithm was specially “deployed” for
greater visibility. As you can see, you can
obtain a larger palette of colors only by
adding new links "***"+"***"+"Halt"...
True, there will be a flickering - not in a fairy tale.
shut up...                                  
                                         
   Now let's move from theory to practice
and let's look at the real code. I'll say right away
that the procedure is tailored to the Pentagon -
Chinese INT.  It is not possible to modify it for your computer.
will be difficult, I hope...             
                                         
;Multicolors border & 4x4 cHunky op bor- 
;der. Demo version for Pentagon INT.     
;(C) Nickolas -VNN- Vitenko 1999         
;Listing for ALASM.                      
                                         
        ORG #8000                    
        DEFS 257,#81 ;table IM 2    
                        ;for unstable
                        ;data buses     
        ORG #8181                    
        RET ;processing IM 2  
                        ;we don't need it!   
        ORG #8200                    
        D.I.                               
        LD A,#80                    
        LD I,A ;understood, right?    
        IM 2                        
LOOP EI                               
        HALT ;can be removed for
        XOR A ;experiments   
        OUT(#FE),A                  
        LD BC,403 ;delay until 
B1 DEC Sun ;started more or less
        LD A,B ;visible part   
        OR From ;curb         
        JR NZ,B1                    
        LD A,7 ;white border    
        OUT(#FE),A                  
        LD BC,6 ;outlined in white
B2 DEC Sun; line for kra- 
        LD A,B ;cells. On the brake -
        OR With ;nyh computers nothing-
        JR NZ, B2; it’s not visible :(  
        DEFS 6;wasteful,  
                        ;but 24 clock cycles Wait
        LD C,#FE                    
        LD HL,DATA1;output program
ADDT EQU $-2 ;on block curb 
        DUP 32 ;measurement data 
 NOP ;to address  
        NOP ;in HL. In bars  
        DUP 13; this will be 224.  
        OUTI                             
        EDUP                             
        NOP                              
        NOP                              
        EDUP                             
        XOR A ;black border 
        OUT (#FE),A ;we add the remaining 
        JP EFF1 ;seating place.    
ADEF EQU $-2 ;variable    
                        ;address hypertransition
                        ;move to EFF1/EFF2
EFF1 LD HL,EFF2 ;address replacement  
        LD(ADEF),HL                
        LD HL,DATA2                 
        LD (ADDT),HL                
        JP PROD                     
                                         
EFF2 LD HL,EFF1                  
        LD(ADEF),HL                
 LD HL,DATA1                 
        LD (ADDT),HL                
        JP PROD                     
                                         
PROD LD HL,0;cunning method for-
        LD DE,0 ;holds          
        LD BC,2                     
IZ EQU $-2                      
        LDIR                             
        LD A,#7F                    
        IN A,(#FE)                  
        RRA ;space - exit  
        JR NC,Stop                  
        LD A,#DF                    
        IN A,(#FE)                  
        RRA ;"P" - increase 
        JR C, KL1; delay        
        LD HL,(IZ)                  
        INC HL                       
        LD (IZ),HL                  
KL1 RRA ;"O" - decrease 
        JR C,KL2                    
LD HL,(IZ)                  
        DEC HL                       
        LD (IZ),HL                  
KL2 JP LOOP                     
                                         
Stop DI                               
        LD A,#3F ;restore    
        LD I,A ;normal mode
        IM 1 ;interrupts      
        EI                               
        RET                              
                                         
;data of the 1st color combination         
                                         
DATA1 DUP 16                       
        DUP4                        
        DEFB 1,5,2,7,4,3,1,7,4,6,2,5,0
        EDUP                             
        DUP 4                        
        DEFB 1,2,3,4,5,6,7,1,3,4,6,0,7
        EDUP                             
        EDUP                             
                                         
;2nd color combination data         
                                         
DATA2 DUP 16                       
        DUP 4                        
        DEFB 0,1,0,1,0,1,0,1,0,1,0,1,0
        EDUP                             
        DUP 4                        
        DEFB 2,0,6,0,3,0,5,0,1,0,4,0,6
        EDUP                             
        EDUP                             
                                         
   And notes.Once you launch
above program, you will see the
developed stripes of different colors and
tenkov, as well as cut-off chunks-points. B
this way it’s not very beautiful, so
they can be removed using the "O" and "P" keys. Fak-
It's almost like manual adjustment of the clocks
computer for effect.                        
                                         
          About another #1          
At first it was planned to place it in "Cher-
Noah Vorone" two more variants of this effect
fect (with one moving vertically
range of color combinations, as well as with two-
me by moving vertical stripes, but
this seemed to us unnecessary for now, and not
will prevent you, readers, from experimenting yourself
ment. GO FOR IT!                   
                                         
  VNN has been active and
fruitful work on the invention of all kinds
multicolor effects like on a border,
and on the screen. So, recently he wrote
for our new demo, which will be released soon -
children (January-February 2001), several
parts with border effects, where in one
one of them says "ZX" on the curb without
all sorts of “squares” and flickering (personally I
after viewing this masterpiece for a long time
dropped my jaw on the table :). Also un-
dependent movement of six "color sprites"
kov" along the border! Also in the "assortment"
there are many other effects. For example
measures, smoothly moving running line
like on the border (it also has enough color
run).  If you are interested, then in the next
issue of the magazine we will publish examples of these
and other effects.                       
                                         
          About another #2          
                                         
People!!! Who has extra (or
extra) aligned printed circuit board(s)
DMA-card - respond!  We are pleased
We will buy it (or them) for a reasonable price.
Or at least there is a magazine "Radio-
amateur Your computer" numbers 4-7 of this
year (2000, naturally), where it was published
The PCB layout is jubilant.        
                                         
            Epilogue             
                                         
   If you have any questions
or you want to correspond, then write
write to us at the following addresses:         
                                         
             86486             
   Denis Vasilievich Tokarchuk   
             PO Box 1             
        Yenakievo=19         
       Donetsk region        
            Ukraine            
                                         
or                                      
                                         
             86486             
  Nikolai Nikolaevich Vitenko   
       house 5 apartment 16       
         st. Jubilee         
        Yenakievo=19         
       Donetsk region        
            Ukraine            
                                         
P.S. Speccy rulez forever!!!             
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