Manufacturing multicolor
music by DNK
(C) MIK. VIRT GROUP.
_______________________________
This article is a direct logical
continuation of the previous dedicated to curb the effects.
Therefore, for the best understanding set out below, I advise
you
read the previous article.
Part of the first and only.
Multicolor can be defined as such
presentation graphics, and
which with the help of software tools
achieved in obtaining a familiarity
more than two colors. Note:
Please note that receipt of
more than two colors within the byte
owned by familiarity, nevozmozhmo
by the following type of technology.
Now it's time to move to a description of the technical side
of multicolor. As I noted earlier, the principles of the
curb-effects and multicolor similar. The most problematic
is fixing them in time.
The very existence is based multicolor
on the fact that the construction of each line
the main screen, ULA (group Chipset
Responsible for graphics output) re-
reads the information from the attributes and
If, after the construction of a fragment of the screen,
before the start of construction of the next line
replace the data describing these lines,
then the next line will be constructed in accordance with new
data about the attributes. So, in order to obtain multicolor,
you need to make the following steps:
1. Wait for the signal INT.
2. Pause before the start of
construction of region of interest (on
actually lower at the time that you
necessary to transfer the necessary information
In the Attributes).
, 3. Wait until you have replaced the attributes will be built.
4. Throw in their place the new data.
5. If necessary, pause =
When you build a single line - the time
spent on items 3 and 4.
6. Cheerfully proceed to step 3.
7. Do something useful.
By tradition, will not clog your head
empty writings, and immediately move on to the suit.
Arrange in a multicolor line of zero ,0-5
familiarity.
ORG # 8000
DI
LD HL, # BE00
LD DE, # BE01
LD BC, 256
LD A, H
LD (HL), # BF
LDIR
LD I, A
LD A, # C9; Processor
LD (# BFBF), A; interrupt
IM 2; command RET
MAIN EI
HALT
DI
LD A, 63;!
LOOP1 DS 52, 0;!
DEC A
JR NZ, LOOP1
; Loop waiting for constructing
; Border, the time depends
; The type of computer
LD HL, DATA
LD A, 8
LOOP2 LD DE, # 5800
LDI; 16
LDI; 16
LDI; 16
LDI; 16
LDI; 16
LDI; 16
; Transfer attributes
LD DE, 0
; No significant team
; Needed something to spend
; Time
DS 23, 0;!
, Waiting up to 224 cycles (for
, So most Comper
; Building line.
DEC A
JR NZ, LOOP2
LD A, # 7F
IN A, # FE
RRA
JP C, MAIN
IM 1
RET
DATA DB ......
; Data about the attributes.
All time delay in this example
made under the Scorpion. If you have another type of computer
you'll have to choose the numbers in the rows marked with (!).
Actually, that's all you can say
this issue and I hope that you will be able to apply this
knowledge. _______________________________
