Studies - LED channel music processor. The procedure for cleaning the screen. Proposal for standardization.

<b>Studies</b> - LED channel music processor. The procedure for cleaning the screen. Proposal for standardization.

(C) Denis Borisov, Kstovo


   The first procedure is an indicator of channels of music 
processor. Yes, in the sketches have been published several 
options indicator, but a single attribute. Yes, and place the 
effect of rigidly defined for All three channels of music. 
processor. In our procedure address the effect can be set 
separately for each of the three channels.


   You can use the indicator
as follows: draw a picture for each channel has its own, and 
black INK PAPER, then when the indicator is highlighted in the 
picture INK'om depending on volume.


   The length of the procedure, 53 bytes,
Compare with previous versions. The indicator is calculated at 
16 gradations of volume and issue a

given familiarity screen color attributes INKa corresponding 
volume played notes also used BRIGHT. This

protsedurku we wrote together with
Alexey Nikolaev.
140.

          ORG 60000


          LD BC, # FFFD

          LD A, 8

          PUSH AF

          CALL LOOP1

          CALL PRINT1

          POP AF

          INC A

          PUSH AF

          CALL LOOP1

          CALL PRINT2

          POP AF

          INC A

          CALL LOOP1

          CALL PRINT3

          RET
LOOP1 OUT (C), A

          IN A, (C)

          AND 15

          RRA

          RET NC

          ADD A, 64
And if BRIGHT do not, then remove

          RET

; Addresses screen attributes
; Channels A, B and C. We can add; vit 3 10-15 familiarity on
; Channel.

PRINT1 LD (22528), A

          RET
PRINT2 LD (22529), A

          RET
PRINT3 LD (22530), A

          RET
2

   Addresses for the channels selected
for example, and can be any
others.


   Next protsedurka is clear the screen.
Such or similar software, I
(DENWER-DEN) in the Revue are not met.
This program from I tore out of the game
COMANDO TRACER and 40% recycled. What came out of it,
judge you.

   Now about the program. After
Launch the program established
black construction paper and bright white ink, then the picture 
becomes smoothly move from the screen edges to the center to 
complete disappearance. 140.


          ORG 40000

          ENT


          LD HL, 22528

          LD DE, 22529

          LD BC, 767

          LD (HL), 71

          LDIR
METKA LD IX, 61952

          LD B, 96

          LD L, 255

          LD H, 0
L2 LD (IX +0), H

          LD (IX +1), L

          DEC L

          INC IX

          INC IX

          DJNZ L2

          LD B, 96
L1 LD (IX +0), H

          LD (IX +1), L

          INC L

          INC IX

          INC IX

          DJNZ L1

          LD B, 0
MET PUSH BC

          LD IX, 61952

          LD B, 0

          LD HL, 16384
DEN1 LD A, (IX +1)

          ADD A, (IX +0)

140. LD (IX +1), A

          CALL C, DEN2

          CALL LOOP1

          INC IX

          INC IX

          INC B

          LD A, B

          CP 192

          JR NZ, DEN1

          POP BC

          DJNZ MET

          RET
DEN2 LD E, 15

          PUSH HL

          SRL (HL)

          INC L
DEN3 RR (HL)

          INC L

          DEC E

          JR NZ, DEN3

          POP HL

          PUSH HL

          LD A, L

          ADD A, 31

          LD L, A

          LD E, 15

          SLA (HL)

          DEC L
DEN4 RL (HL)

          DEC L

          DEC E

          JR NZ, DEN4

          POP HL
LOOP1 INC H

          LD A, H

          AND 7

          RET NZ

          LD A, L

          ADD A, 32

          LD L, A

          RET C

          LD A, H

          SUB 8

          LD H, A

          RET
2

   I hope you enjoy these
Two small protsedurki.


   Now about the issue, which
has been raised repeatedly in the pages of ZX-Revue. 
STANDARDIZATION. All correspondents offer (in

Basically all) to standardize
our good old SPECCY, system connector, Kempston, co-processor, 
etc. etc. Gentlemen, at this stage it is unreal!


   Look how many species we have the Spectrum will not be 
mistaken if we call the number 30 or 40. And to hope that

users of these computers
abandon them in favor of standardized offspring, which we 
propose to have a joint effort at as unreasonable.


   My proposal is as follows. Must
make custom programs
and not alter them at the computer. That is, in the software 
itself installs the module is located (or the whole program is 
a preference), which during the initial startup requests 
configuration data computer or keeps track of the

automatically. Then, create a working version of the program. So
properly solved two problems: the question of compatibility and
the issue of illegal copying.
Since after the program settings on your computer and
destruction of the installing the module program is unlikely to 
work on another computer. 


   Ca. Ed.: Good, but not a new idea.
Look at programs such as Alasm
v3.5. There's a compatibility issue solved easier than the 
suggested Denis, but the system drivers more flexible. Thus, 
the users' best interests, even very specific (rare) computers. 
After anyone can write drayverok for themselves.

Now imagine if this task
shoulder programmer, writer
program. He did, in your opinion, MUST
know all the possible configurations that
basically impossible. But when writing a program it must ensure 
its work on the most popular cars, which he did

author Alasm'a.


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