Inferno #10 30 апреля 2007

Железо

Sound - Features audio device TurboSound FM.

   TurboSound FM, also known as TS FM, it is simple
then TFM - a sound device, plugging
in socket AY. Has 6 normal channels
TurboSound (I will call them SSG channels
Without going into particular terminology
energy) and 6 channels particularly cunningly synthesized
transverse sound (I'll call their FM channel
mi). The first six channels do not interfere with the six
second, as well as vice versa, so we
we have 12 channels simultaneously.

   The device is built on two chips
YM2203. It appeared in the middle of the distant
2005, when the LVD soldered circuit developed
tannuyu them with JTN'om. Later
scheme to fix and be refined
active participation CHRV and King of Evil.

   In that same 2005 Dexus (known as
author of the musical editor PSM) added
in UnrealSpeccy emulation device and vmes
those with Shiru began to convert under him
music from the Sega Mega Drive. On this police officer
Ke (also known as Sega
Genesis) is a combination of two sound
chip (SN76489 and YM2612), possessed by
approximately the same capabilities, but SSG Channels
there are other (and not tonalnikov 6, and 3)
and the FM part of the added low-frequency gene
operator - for vibrato.

   In 2006, Shiru began to write the editor
Music for the TFM (affecting only the FM
channels) - TFM Music Maker. He had a long development
was considered in the form of betaversy and most recently
was released for public review.

   TFM Music Maker is able to upload music
the flow registrov.Mozhno just play
this stream, but you can recompile my
utility TFM compiler, which makes it much
more compact file (a few kilobytes
instead of tens).

   The special trick of sound synthesis in FM ka
nalah TFM is that the channel -
this is not a generator, and four, with different
in general frequencies. They modulate
each other, joined by some scheme.
Scheme (all these schemes, 8 - to sound again
type) can be selected for each channel
la. In addition, while playing music
does not necessarily change every frame
loudness values ​​(generally speaking, the amplitude
amplitudes of the generators). It makes itself glands
only need to specify for each generator
speed of attack, decay, hold and release
of, as well as the level where the decline becomes
retention, and total volume (in general
series, the maximum amplitude, from which the races
read other levels). After this
each new note can be synthesized, pro
giving one hundred press and release events
buttons and changing the base frequency (frequencies
operators are calculated by Asked
factors). Therefore, the FM music player for
TurboSound FM, despite a lot of options
sound, very fast - about 1500 cycles
srednem.Tolko in the peak (when changing tools
ments) the execution time can be income
dit to 13000 cycles.

   In the Appendix are examples of music as
written in the TFM Music Maker'e and velocity
nvertirovannoy with Sega Mega Drive. In music
from the game Sonic 3D Blast thrown digital
shock, but theoretically they can be implemented
vat. In your application as an example
is the source player for modules TFM
compiler (the same player and have to
Sega Mega Drive - it ported back
Shiru).

   Programming Instructions TFM
(Booklet format. Doc) with source
converters and various players lying on
http://alonecoder.narod.ru/zx/books/
This manual is constantly updated and
files to it - too.

   This year, organizers DiHalt 2007
(2-3 June 2007, Nizhny Novgorod) for the first time
organized a competition TFM music. Please
all people of goodwill to participate in
competition. To avoid overlap compile
vat sent by modules assigned to me, so
(So ​​as not to lose precious time, which
rogo there are few) modules do not send
directly to my address.

Alone Coder