Hardware - About connecting AY-3-8910(8912) for playing digital music.

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  (C) DR.DEATH/SPEED Co.'97        
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       About connecting AY-3-8910(8912).     
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    Recently, a large number of
number of SPECTRUM compatible machines,
which either there is no musical co-process
litter, such as  PENTAGON 128K, or
the connection is so faulty that it hurts
The majority of Russian SOFTA is simply silent,
for exampleSCORPION ZS 256, on which there is no
it is possible to listen and also write DIGITAL
SOUND. Not possible on most machines
listen to digitized music written by
in fraternal Poland , since the 'smart' Polesbefore “throwing” data into the port
do something like this:                         
                                          
           OR  #80                       
           OUT (#FD),A ,                 
                                          
although most of our machines require
do:                                   
           OR  #A0                       
           OUT (#FD),A                   
                                          
It was these glitches that made me reconsider
Read the connection diagram AY-3-8910(8912).   
                                          
 In the scheme that I present,
we  all   to me known disadvantages.
The coprocessor does not “garbage” onto the bus during
fetching the command by the processor, since it was entered
signalM1:sampling of musical coprocessor
ra is now independent of stateA13and
thanks to this there is  DIGITAL SOUND in
all Polish demokhs...                
 Well, now let's move directly to the diagram:

    If you understand the principle of operation of this
diagrams, and understood where all the signals come from
for the functioning of the circuit, then forward for
a soldering iron, and for those who have recently been in our robes -
yeah, I’ll explain how to launch the very scheme
tit.                                     
All signals of typeM1,not WR,A14,A15,A1,
not IORQ,RESET you can take it from the system
connector of your computer, if any
in stock. But if you still don't have
system connector, then these signals are reduced
start from the same feet Z80.               
 Signals D0-D7 go to the legs of the same name
processor Z80 .                          
A signal with a frequency of 1.75 MHz can be removed from:
                                          
       Moscow 48k   2D3                  
       Leningrad 1   2D35                 
       Leningrad 2   2D3                  
       Pentagon 48k 2D10                 
       Pentagon 128k 2D3                  
       Moscow 128k   2D3                  
 If your car still didn’t hit
on this list and you don’t know where it is (hour-
that) take, then look for the scheme 1.75 MHz
in the area of ​​the clock generator. Signal from
such a frequency can exist either at
mikruhe 5SSUES,or 5SSUE7,variations are possible
antes. If you are too lazy to look for something by...
some scheme, then just repeat what I
I drew it in the lower left corner.            
                      
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║  WARNING!!!  ║
║   ║
║ Micro power supply ║
║ 5SSUES scheme submitted - ║
║ is on 5 and 10  ║
║ legs: +5V and ground ║
║  respectively   ║
║                    ║
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Сигналы   с  выходов
сопроцессора   можно
комбинировать,   как
душе угодно.        
 Например, соединить
все  выходы  в один,
как  это было сдела-
но на фирменном 128к
SPECTRUM'е.         
And if you have a sky
a crazy fantasy, then
I offer my variation
ant (see picture).   
                    
 I indicated on the diagram
main   option
ABC STEREO, like  
me,  although now
more and more  people
writes under ACB STEREO.                     
 Well, at the end of the article I’ll give a couple of small
tips:                                  
 1. If your wheelbarrow does not plow digitally
bathroom sound in Polish demos, then just
tear away from the coprocessor sampling circuit
signal A13,agive a signal instead
A15.                                      
   2. If your sampling scheme is co-processed
Sora the signal is not activated M1, then for the purpose of
reliability better enter instead of signal
A14 simple mixture signals  A14 and M1
through any 'AND' element, for example 5SSLI1.
                                          
Now, if there are no questions, go ahead!
                                          
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