Exchange of experience - DIGITAL MUSEC + SCORPION - wiring diagrams AY.

<b>Exchange of experience</b> - DIGITAL MUSEC + SCORPION - wiring diagrams AY.

     (C) Bumagin A. (STEEL RAT Software /

             CPU)

     (C) Music: Davos Soft



        Digital Music + Scorpion



     Many times in many electronic publications has been 
written about digital music on SPECCY, but, basically, all 
articles were aimed at Pentagon. When I bought

currently Scorpion, then faced a number of
problems in this thread, since Scorpion
some kind of machine, and much that
works on other machines on it at all
refuses to work (well, and vice versa), as they say "that 
russkogoblago for German - death." And the problem is following:


     1. In the Scorpion 'e is a little different
wiring diagram AY;

     2. In connection with non-corporate
SPECCY scheme does not work, some Polish and English demos with 
digitization; 

     3. The printer port has a different address
and therefore is not for the music for Covox
Pentagon 'a.

     Voobschem This is not an exhaustive list, but
this is a topic for another conversation.


     We begin in order (just like the one
defendant, who asked "How
it all started? "-" God created the Earth "):


     Went to digital music by
AY, requires three things: a knife, soldering iron and a 
resistor of 1 kOm. 


     Open the chest with chips
(Scorpion) and look for a chip D53, usually
it KR1533ID7, saw off her 6-foot by
tracks above the scalpel and solder in between her and +5 
resistor (you can solder between the 2nd and 12th). Everything 
now You will work SampleTracker, Digital

Studio, Instrument and anything else that
throws digitization at AY.



     For those who first opened his
Scorpion and saw a bunch of chips (yes
still, sometimes, and unmarked), cite
wiring diagram this revision.


 System

  raz'em Mounting box



         TM9 TM9


                              AY3812


        KP11A ID7


             1k

     X


     Sometimes, instead of AY3812 set
AY3810 on the assembly field, but in general
is "the speed is not affected."



     To implement the second paragraph of our plan for you: 
Again, a scalpel, soldering iron and a piece of wire (as thin 
as possible, and then the trunk will not close). 


     First, determine what you vpehnut coprocessor in your 
computer: AY3810 or AY3812, since the numbering of the 
conclusions they have does not match. Then you need to find

28 th for the AY3810 (with 19 to AY3812) leg and
saw off her on track. Thus, we deny entry BC2, er ... No, not 
that you thought, and the signal A13, because of which

we have not worked polish demos. And on
location of the signal must be submitted +5 V. Where
I get them? But at least the 40 th leg AY3810
(Or third AY3812). Now payaem Wire
and ... we passed the second level of the game under
entitled "If not himself, then who?".



     Okay, it's lyrical digressions. We proceed to the next 
problem. I warn you right away who do not want to hang myself 
Covox, can stop reading, because will continue to be a question 
just about this gadgets for SPECCY.




     What kind of beast this - Covox?
Actually, it is usual DAC or digital to analog converter. That 
is, he tramp down a bunch of numbers into an analog sound. 
There Two basic concepts Covox'a: based on a resistor matrix 
and based on the chip DAC (typically KR572PA1, but variants are 
possible). Both schemes have both advantages and disadvantages 
(although rumor is not noticeable!). 


     Resistor MATRIX MC KR572PA1

------------------- ---------- R2
CO> general

                         +5 B January 1916 X

   R2 R1 0.1MkF February 15 Sound
C1 = March 14 +5 B

                > Sound D7 April 1913

   R2 R1 D6 May 12 STROB
C2 D5 11 June D0

                          July 10 D4 D1

   R2 R1 R1 = 7.5K D3 Sept. 8 D2
C3 R2 = 15K


   R2 R1
C4, of course, the resistive

            easier to assemble, no need to +5 B,

   R2 R1 and even find them more easily than the DAC
C5, on the other hand, the chip

            can be put on stage

   R2 R1 field and it will take much
C6 less space. Actually, it

            a matter of taste, but the taste is not

   R2 R1 argue.
C7


       R1



     All is good, except that the printer port to which this 
thing is soldered, the Scorpion 'a purely his own, the one and 
only - DDh! And do not like the Pentagon 'a - FBh. Therefore, 
all the music under Covox, written on the Pentagon 's, the 
Scorpion' e will not play. Classic question - WHAT SHOULD I DO? 
Reply so the same classic: take a scalpel,

soldering iron ....

     There are two ways to resolve this problem: software and 
hardware. 

     If you have no desire to solder, you can
any program monitor correct
output port for Covox, ie,


     OUT # FB

     replaced by

     OUT # DD


     In general, then you have all
will work fine. Just do not forget that every time you have all
this was done with each new program
under Covox!

     Hardware method invented Alexander
Majors and he was described in the journal
ZX-NEWS. Here's his diagram:


     Cut

D55 (1914) X D10 (11noga)


                  /

                 

          /

A2 2K
Z80 (32)>

          /


     In dopolnenie this mean
that if you decide to hang some pribambas, do to disable it 
(once the switch is not your SPECCY corrupt, out of ELF 'and 
their half a dozen or seven and did not yet blown up). Due

this with the fact that under the law of conservation of 
energy, if somewhere something to add, then somewhere nibub 
anything can burn! So he thinks.



     And finally, I want to bring a small pair shemku AY and 
Covox (for At least I have done so).



     2. 7K
A => LEFT

         7.5K 2.7K

                =

                             0.1MkF
C = = => AUDIO

         7.5K 2.7K (BEEPER)

                =

         2.7K
B => RIGHT


     COVOX


     That's all I wanted here today
write, if anyone had questions
or comments you can send an email to
Address editorial ADVENTURER 'and for STEEL
RAT Software.