Crystal Dream by Triton
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Crystal Dream is a result of many hours spoiling the schoolwork and other
necessary dutys, sleepless nights, lots of fun developing, lots of hard work
and a hell lot of debugging and finetuning. (mera kåd - mera buggar)
We planned to contribute with it at Hackerence 5 in Härnösand, but we ran
out of time and couldn't show a 100% version. Some time passed till we got
all the inspiration needed to finnish the project, but 6 weeks later the
product was ready for a release.
REQUIREMENTS
This demo requires a 12 MHz 286 with VGA graphics, but we recommend at least
a fast 386 computer. You'll need about 550 kb free memory. If you have a
386 or 486, make sure that there's no EMM386/QEMM386 driver or something
like that installed, because these programs slow down your computer while
playing music.
It supports SoundBlaster, SoundBlaster Pro (Stereo), parallell port D/A
converter (Mono and Stereo) and internal speaker for the music. If you don't
have a SoundBlaster card, we recommend you to build a D/A converter. The
internal speaker has VERY poor sound quality.
Howewer, you should be entertained by this demo when it is running on a true
486 computer with a real stereo D/A converter or a SoundBlaster Pro card
connected, in a dark room with a cold cc in your left hand (Why left?
[because it's red of course!]) and your bottom pressed into your most
comfortable chair. We hope it will amuse you even though it's only 16 colors
at the screen, but sometimes that might be an advantage.
HISTORY
The group "Triton" was formed from the old group "The Physical Crew" in
winter 91-92. The most succesful cooperation between TPC and Vogue was
soon developing into a demo, and for this purpose, the name was changed.
Some of the earlier TPC releases are "PC Demo" and "Vectra", but those
demos were no products of some serious work. Vogue is originally an Amiga
programmer and was a member of Phenomena in 91. The name "Triton" is taken
from a moon of Neptune.
ADRESSES
VOGUE
Magnus Högdahl
Skarvvägen 7
861 00 Timrå
Sweden
Tel. +46(0)60-576180 or 576467
LOOT
Anders Aldengård
Rigstavägen 1039
860 35 Söråker
Sweden
Tel. +46(0)60-41582
MR. H
Fredrik Huss
Flädervägen 12
860 35 Söråker
Tel. +46(0)60-41624
Some basic rules:
- If you want to contact us - USE OUR REAL NAMES!!!
- We do NOT want to swap software.
- We won't join any groups with only some gfx-artists and musicians.
- We won't join any other group either.
- If you're a coder, you're very welcome to contact us. (Not LOOT)
- Contact us if you want to inform us about any party beeing held somewere.
- Contact us if you want to spread your latest demo.
THE RAYTRACING STUFF
If you're into raytracing and other vectormatematicaly based graphic
producing, you should contact Vogue. The raytraced pictures were rendered
in "Synthetic Image", which is my own raytracingscene editor. It was coded
as my examswork in the last degree of the gymnasium. (Natur så klart!)
TECHNICAL INFO ABOUT THE MUSIC
If you want to contact us about the music system, you should ask Mr. H,
he's the one behind the music software and hardware. (Teknisk linje, vad
annars???)
The music routine is very optimized since the last demo (Vectra). It can now
play at 38 kHz on a 12 Mhz 286. As a result, it might sound a little poorer
at lower frequences.
The SoundBlaster routine uses DMA and takes less CPU time than the normal
way. It is also possibe to use Stereo on a Pro card. Thanks to Shadow man in
TCB for GREAT help with this.
You can now play Stereo on a D/A converter in the parallell port. This
requires an improved D/A converter with a REAL D/A, it won't work with
resistors.
If you still want to build a simple resistor D/A, here is a drawing:
Parallell port:
Pin
2 ──── 3.2 MΩ ───┐
3 ──── 1.6 MΩ ───┤
4 ──── 800 kΩ ───┤
5 ──── 400 kΩ ───┤
6 ──── 200 kΩ ───┤ ≈ 0.1µF
7 ──── 100 kΩ ───┼───────────┤├─────
8 ──── 50 kΩ ───┤ To
9 ──── 25 kΩ ───┘ amplifier:
25 ──────────────────────────────────
The real D/A converter with stereo is a bit more complicated, but here is a
drawing. You can find the components in for example ELFA. It should work
(it does for me), but don't blame me if you burn your parallell port...
Mr. H
+ 9-12 V
├──────────┐
To │ │
parallell │ 3.3kΩ To amplifier:
port: ┌────┴───────┐ │
│ + RefA├──┼── 22kΩ ── - ≈ 0.1µF
1 ───────┤A/B RefB├──┘┌──────────────────────┤├────── Left ch.
│ │ │ ┌────┐<-- ¼ LM324
LSB 2 ───────┤DB0 RfbA├───┴─┤Out ├──── -
: │: OutA├─────┤-IN │ +
: │: │ │+IN ├──┤
: │: Agnd├───┐ └─┬──┘10kΩ
MSB 9 ───────┤DB7 OutB├──┐└───┤ │
│ RfbB├┐ │ ├─────┴─ 10kΩ ─┬ -
PM7528HP -->│ ││ │ ┌─┴──┐ │
│DGnd CS WR ││ │ │+IN ├───────────┴─────────── Gnd
└─┬───┬──┬───┘│ └──┤-IN ├──── +
25 ─────────┴─┬─┴──┘ └─┬──┤Out │
│ │ └────┘<-- ¼ LM324
│ │ ≈ 0.1µF
- └───────────────────────┤├────── Right ch.
The pins in the parallell port is used as follows:
1 - Selects left or right channel
2 to 9 - 8 data bits (2 = Least Significant Bit , 9 = Most ...)
14 - Pin 1 inverted (isn't used in my D/A, but may be useful)
25 - Ground
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