Hardware - Scorpio improvements: circuit for disabling the music processor.

 SCHEME THIRD (O4EHb NECESSARY)       
                                        
 Surely many SCORPION owners
are familiar with this situation: there is no
some toy (or
MEGADEMO), you press the MAGIC button,
fall out into the shadow service monitor
(in order to break out the music,
put unlimited lives into the toy,
or (less likely) formatted
put a floppy disk...), and in the speakers amplify-
What remains is such a tedious hum, from which
who might go crazy if you don't-
cut the amplifier or do not turn down the volume
bone.  And constantly turn down the volume -
annoying task (especially if you
every now and then you press MAGIC). Here comes
try to listen to the buzzing while you are digging there -
you are in the monitor... I don’t know about anyone,
but I got pretty tired of this glitch, and I
decided to end it once and for all.   
 The crux of the problem is that the developers
SCORPIONA ROM did not provide complete
software shutdown of the music processor
when outputting to the monitor (in fact it
turns off, but the sound specified by the frequency
the envelope remains).                    
 This glitch can be eliminated in two ways -
mi - software and hardware. First
The method is to re-flash the area
O3Y, (well, it’s a very cool _ochepyatka_ 
so I (MH) decided to leave it...;-))
which is unlikelyadvisable at home
loviyah.  The second method is to use
use of free logical element
ment of a microcircuit and several wirings,
which in my opinion is not difficult
ness. If you have a lock
port #1FFD according to the diagram published in
ZX-FORMAT N1 (by the way, a very good circuit
ma, recommended for repetition by everyone
owners of SCORPIONs), then no
There are no problems with modification. Is-
use the first option in this case
schemes. If you have not done this modification,
ku and you do not have free space on the board
nal element “AND” (K5SSLI1), that is, the meaning
or make both improvements together
(block #1FFD and below),
or use two free elements
D57 chips (K555LAZ) on the board
computer (second version of the circuit).      
                                        
 Option-1               
                                        
К5SSЛИ1                 
                                        
 _____ ┌──┐ ______           
 RESET─12┤& O─11──>AU.RES           
_____┌13┤  │                       
     MAGIC┘  └──┘                       
                                        
                                        
               Вариант-2                
                                        
                К555ЛАЗ                 
                                        
     _____   ┌──┐     ┌──┐    ______    
     RESET──1┤& O3──┬4┤& о6──>АУ.RES    
     _____┌─2┤  │   └5┤  │              
     MAGIC┘  └──┘     └──┘              
                                        
          ______                        
 Сигнал   АУ.RES  подается  на  16  ногу
АУ-3-8912  (23  нога  АУ-3-891O). Старые
связи,  подходящие  к  этим ногам должны
быть удалены. Сигналы RESET и MAGIC мож-
но  взять  либо  прямо с соответствующих
кнопок, либо с платы компьютера:        
 _____                                  
 RESET- 26 нога Z8O                     
 _____                                  
 MAGIC- 12 нога D59(K555TM2).          
                                        
 Now hard reset the music processor
occurs not only after pressing a button -
ki RESET, but also after pressing the button
MAGIC.                                  
                                        
P.S. We care about you and your_ears_!
                                        
                                        
 (c) COOPER!
__________________________________________
                                        
 All the above schemes have been tested
We are the author of this article. No anti-
no indications were noticed, so the scheme
we are recommended for wide repeat-
research and use.                    
                                        
P.S.  Any comments regarding: from-
    absence of glitches, steepness of roads,
    and also without any reason to attack
    send it to the editor or to the author
    in person (address in the Advertising section)     
                                        
 Sincerely, COOPER/SHB/ASM/Simferopol
 & MIGHTY/SHB/ASM/Sevastopol'97(n.e.?!)
________________________________________