Dni-Pro #02 30 марта 2001

Железо

RGB2001 - an analysis of existing graphical improvements for the Spectrum, RGB color scheme.

28.06.2000 (GAME BOY)



                R.G.B-2001



                   I


      Hello to all fans of iron!
I decided to write and engage in a discussion you.
And the debate will go on increasing color
for our cars. Say: what more can
speak and write? For many this has been written and a diagram - 
you can not write one book. Well, let's analyze and remember.


  1. Software development. First signs in that direction - 
"multi solor.  Advantages: It is changing the architecture of 
the machine allows you to draw 8 colors on familiarity (8x2 
pixel, 2 colors)  Disadvantage: Poor compatibility with other 
platforms (that one is beautiful, then on the other - 
bullshit), even on similar machines, high costs

processor, it is impossible to draw dynamic images (sprites), 
except tickers and bands.


  1.01. 2 Screen. I do not remember the name of the
direction. I remember the first program
was MACv1.1 (only 128K). Principle:
switching between two screens with a frequency of 50 Hz,
creates additional colors. Example: from
light red to a cherry. I once
try - not bad, it was not necessary to turn out at the wrong 
side of brain to combine the color, as in multicolor.  
Disadvantage: Not a flower, ever any Halftone primary colors - 
this can be accept. Staring at the screen - not very

looks, especially in black and white monitor.

  1.02. 3 of the screen. This seems to be the peak of software 
excellence. Somewhere about 256 colors and shades, you can 
insert photos, and somewhere saw something like cartoon, even a 
toy is "Rabbit"  (Author, answer will be in touch.)

And the studio 3hCOLOR appeared.
 Disadvantage: One very significant.
Guess? That's right, BLINK, although
There are many outlets: mute the brightness and
contrast of the monitor (TV), turn off the light, draw the 
curtains ... Sorry, but this is perversion. 


                   II

 Now consider HARDWARE DEVELOPMENT.

  2. A hardware multi color. In our region do not like, can be 
somewhere and settled down, but rather because of the software 
has not spread much. If I am wrong - please. 

  2.01. FLASH. Well, it reminds me of
snowball: polls done everything, sighed, gasped, and back 
everything was restored.  Disadvantage: The paint on 
familiarity. 

  2.02. FLASH.1. Not a very serious reworking, too little 
stuck. Here, rather, its role was played by the absence of 
software Although, somewhere something delolos operating 
principle: a monochrome screen (black) you can draw in flash 
mode, only two colors (for familiarity), but with a rich 
palette.  Disadvantage: I will not lie, did not work.


  2.03. INTERLES Please God, remember
principle is this: Split screen on-line:
1 line - 1 screen, 2 lines - 2 Screen 3
Line - 1 screen, 4 lines - 2 screen and
etc.
 Disadvantage: All the time split screen.

  It seems that I have listed. May have forgotten that, but the 
basic name. 


                  III


  I do not zhelezyachnik and not a coder, and the artist
and my opinion and probably ostalnyh of our brethren (artists): 
-= HELP COLOR = As the saying goes, let's not reinvent the 
wheel, and turn to have the actual production and recall DENDI. 
Well, again, you say, were already developing in this

subject, and not alone. And who said something about adapters? 
I was referring to the architecture DENDI. Let's start with the 
video ... Yes - yes! from memory. At this point you can buy 
your cache (8, 16, 32K) for a penny, in any region. With this 
proposal, I asked to one group and asked them to think

development based on the cache and the GPU HA6538, no, not 
right. Take the basis of the formation of a processor and a 
video put in SPECTRUM. The boys coped,

but I was gnawing hunch is painfully
This smacks of the bells and whistles 3hCOLOR that
they are confirmed.
 Principle: the screen Simultaneously drawn with three colors 
(RGB), does not take CPU time. 


  I give the floor to the developer.

 - Yura, explain the principle of its development.
 - Video consists of three similar blocks of memory, each for 
its color (RGB), consisting of the cache registers

(Buffers) and the shift register, and port improvements, in 
which the perekyuchenie screen areas, inclusion and

shutdown mode and much more. Output
images on the screen is carried out simultaneously reading from 
the cache three attributes. Record in each cache (the area of 
​​color) is consistently based the state of the port, ie, each 
byte three-color image is recorded separately. If there is a 
cache of 16 or 32 kb, then we can make 2 or 4 screen.



data bus



           IR IR IR cache

            23 23 9

                  8Kb

                                      R

                                   o>



                       scheme



           IR IR IR cache

            23 23 9

                  8Kb

                                      G

                                   o>



                       scheme



           IR IR IR cache

            23 23 9

                  8Kb

                                      B

                                   o>



                       scheme



                    OUT 252 R.G.B.

    PORT: 0,1,2 - PAGE.

    Revised: 3,4 - VYBOTR FOR READING

                        SCREEN.

                 : 5,6 - CHOICE FOR RECORDING IN
 RIGHT SCREEN.: 7 0,1 - OFF, including CHIT.

PS From the Editor, tobish from me: though it is possible
and simplify the scheme, prisoedenyayus and send their designs 
and development.