-COMPUTER PERFORMANCE/INSTALLATIONS: T.E. Batten
Program, compiled to run on standard Amiga
Generates continuous image/sound
Once started the program is completely autonomous
Can be situated in exhibition, reception or queuing areas
or anywhere where a monitor with (hidden) computer can be placed
or where (optional) video projection is possible.
Areas are preferred where (casual) visitors may be (repeatedly)
confronted with images over a period of time rather than
being required to visit location specifically to view work.
Program can be silent if required -to avoid sound problems.
Program does not interact with public -no extra space required.
3. Personnel Requirements:
required to set up (and start) computer system.
4. Estimated set up time:
Essentially the time it takes to set up a computer system in situ.
the programs can be transferred to the hard-disk
and automatically started via the "start-up" file.
programs are to be run on consecutive days then
the programs are easily started manually by double clicking
on the icons.
to allow sound versions to run on Amigas with different
processing speeds, a total of four input data may need to be
entered via the keyboard immediately after staring the program
(see "Sound Notes").
5. Equipment Requirements For Live Performance:
Computer (1200, 3000 or 4000 have been successfully used)
-External Amplifier + Speakers (advisable for optimal sound quality)
-Video Projection System -or Monitor
-Projector hangup system -or Plinth (or table with cloth) for Monitor
-Power supply and connecting cables:
-computer to power supply
-computer to monitor/projector
-computer to sound system and speakers
-Mouse and Keyboard may be required to start programs,
but should be out of sight when programs are running.
These are general remarks
based on the presentation of a single
(unspecified) work running on one computer. Most (recent) works
are in fact based on a series of variations and can be presented
on a single computer over a period of time, or on several computers
simultaneously. Obviously, specific works may, for aesthetic reasons,
require variations in the presentation (i.e. formal or informal
Although intended for continuous
operation the random configuration
set up while initiating the procedures make it impossible to guarantee
that in all cases a process will not degenerate to a static image.
Should this happen then restart the process and inform the artist.
Regrettably, the artist cannot
provide hardware for the installation.
6. System Preferences:
presentation can be via monitor or video projection.
For optimal visual presentation the Amiga screen preferences
should be set to:
PAL: High Res
Visible Size: 640 x 256
Font: Topaz 8
7. Sound Notes:
The Machine processing speed
affects the sound. This sound has been
developed on an AMIGA 3000. A faster machine may process the image
quicker than the sound pulse -which means the sound queue can get
too long and the whole system simply jams up (requiring a reset).
Therefore the versions on
the disk allow one to "fine tune"
the sound according to taste and the machine speed.
(trial) input values are placed <within these>
the first set (on each line) give the values used in the 3000
version and the second set (on each line) give a possible value
for a machine approx. 10 times faster. One is free to play with
these input values (please let me know if you discover fantastic
values which are much better than mine).
line defines <pulse Width, pulse Duration> ratios.
These directly affect the Timbre and usually can be the same on any
machine. Doubling the pulse Width value will double the hypothetical
frequency which defines the potential pulse Width. Halving the pulse
Duration value will halve the actual Duration of the pulse
(in relation to it's Width).
line defines <Constant pulse delay, Variable pulse delay>.
The total pulse delay is a function of these two values.
These values are machine dependant. As a guide to finding the
input input input
1,0 2,1 2,1
0,0 2,1 20,10
a. If sound-queue jams up -increase one or more values.
Instead of waiting for machine to crash, depressing the
Right-Hand mouse button in the upper left corner of the
screen (the menu QUIT function) will temporally stop the
program without Exiting. If the sound continues after the
program has stopped -Delay values are too short (or possibly
pulse Duration is too long).
Obviously the Variable factor gives a statistical increase
and not an absolute increase.
b. If separate pulses can be heard -decrease one or more (Delay)
Please use a separate stereo-amplifier
with external speakers for
each work if one wishes optimal sound presentation.
Amsterdam, March 1998