<s>
Psychedelia	B-Application
is	O
an	O
early	O
light	B-Application
synthesizer	I-Application
developed	O
by	O
Jeff	O
Minter	O
and	O
published	O
by	O
Llamasoft	O
in	O
1984	O
.	O
</s>
<s>
It	O
was	O
converted	O
to	O
the	O
MSX	B-Operating_System
and	O
ZX	B-Operating_System
Spectrum	I-Operating_System
by	O
Simon	O
Freeman	O
.	O
</s>
<s>
Psychedelia	B-Application
allowed	O
a	O
user	O
to	O
generate	O
a	O
light	O
show	O
on	O
the	O
screen	O
grid	O
,	O
using	O
the	O
joystick	O
to	O
send	O
pulses	O
or	O
bursts	O
of	O
coloured	O
squares	O
.	O
</s>
<s>
Unlike	O
Minter	O
's	O
later	O
synthesizers	O
such	O
as	O
Neon	B-Application
,	O
Psychedelia	B-Application
does	O
not	O
use	O
audio	O
as	O
a	O
factor	O
,	O
only	O
using	O
a	O
joystick	O
's	O
input	O
.	O
</s>
<s>
He	O
coded	O
it	O
in	O
6502	O
assembler	B-Language
language	I-Language
,	O
fitting	O
into	O
about	O
1	O
kilobyte	O
.	O
</s>
<s>
He	O
continued	O
to	O
develop	O
the	O
light	B-Application
synthesizer	I-Application
concept	O
,	O
designing	O
Colourspace	O
(	O
1985	O
)	O
,	O
Trip-a-Tron	B-Application
(	O
1987	O
)	O
,	O
Virtual	B-Application
Light	I-Application
Machine	I-Application
(	O
1990	O
,	O
1994	O
,	O
2000	O
and	O
an	O
unreleased	O
version	O
in	O
2003	O
)	O
and	O
Neon	B-Application
(	O
2004	O
)	O
.	O
</s>
<s>
Psychedelia	B-Application
,	O
along	O
with	O
other	O
older	O
Llamasoft	O
programs	O
,	O
has	O
since	O
become	O
public	B-Application
domain	I-Application
software	I-Application
.	O
</s>
<s>
On	O
its	O
release	O
Psychedelia	B-Application
received	O
mixed	O
reviews	O
.	O
</s>
<s>
Your	O
Spectrum	O
criticized	O
the	O
concept	O
of	O
a	O
light	B-Application
synthesizer	I-Application
,	O
describing	O
Psychedelia	B-Application
as	O
boring	O
and	O
awarding	O
an	O
average	O
of	O
2/5	O
.	O
</s>
<s>
The	O
magazine	O
featured	O
Psychedelia	B-Application
on	O
their	O
October	O
1991	O
covertape	O
.	O
</s>
