AY-VS / M - How to distinguish between coprocessors AY and YM.

<b>AY-VS / M</b> - How to distinguish between coprocessors AY and YM.

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           AY versus Yamaha
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                    (C) Viper / Techno Lab

                       (C) Oleg Bashtenko


  Well, it would seem that in such complex
small melkosheme as musical co-processor. However, until now 
pC-Schnick not can make a plausible simulation

this chip. There are problems with
using real ZX. I do not have
because of troubles with the frequency 1.75 ... MHz. There
another problem - the model co-processors.
In use are the following models:
AY 3-8910 General Instruments
AY 3-8910 (Taiwan, Korea)
AY 3-8912
YM-2149F Yamaha


  How to distinguish between coprocessors AY? If the
chip package is a letter GI, then your
AY from the firm General Instruments, if their
No - then hack "dragons".

  Real Spectrum 128 used
AY-8910 the firm General Instruments. Then
Sales appeared shorter analogs
AY-8912. The sound quality is the same. Further, the market 
flooded YM-2149F. This is apparently connected with the release 
by Yamaha coprocessors for PCs MSX own production. The trouble

that YM - not a complete analog AY
both in sound and in some
functions for operations with registers (at
This is based auto-in demo
Action).

  Personally, I noticed a difference in sound from the 
coprocessor connection to your Computer (July 1994). The fact is

I took my OM to his other
Schneider computer system MSX-1 (who
do not know - based also on the Z80A, but
more colors, and each line znakomestasvoy color besides 
graphics OM). It was the AY of General Instruments. Later, I 
decided to put on AY place (MSX) and bought another coprocessor 
- Yamaha. 

  I did not like the sound, I thought that
a defective copy changed and went to another (also a Yamaha). 
It turned out The new co-processor sounds even worse

previous ... In general, YM passed through
My computer is about ten and three AY. My
personal opinion - AY sounds cool. She
softer sound (including envelope), any music is melodic.
What about all the special envelope the conversation:
YM cut it as he wants. Well, really bad - YM sounds quieter AY.

  I now have 2 chip AY and YM.
Continuing costs AY. To put the interest of YM. Half of the 
effects had disappeared, the envelope has played quite 
differently ... 

  Here's the thoughtful - you write
music by AY, and the listener hears it
YM or vice versa, and he hears not
what you wanted.

  For example, the music for the 3rd, 5 th and 7 th
issues of the paper was written on AY. In this
room - on Yamah'e. Also in different schemes for different 
channels are mixed: in some ABC (A-left, B-centre, C-right), in 
other ACB (A-left, C-centre, B-right). 

  For a newspaper is always music written for
scheme ABC (all such schemes, and the editor written by ABC).

  This topic was discussed in the Fido-echo ZX.
SPECTRUM. The most interesting passage, and
offers:

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