Strange Demo screens

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Strange Demo screens

Postby alexh » Tue Jan 16, 2007 1:34 pm

I am looking for a list of demo screens that did strange things with the ST. I remember one or two screens doing outrageously different things

Like What?

Strobe (PCM) the drive / power LED. I am sure that one of the LED's was supposed to be uncontrollable from software and someone worked out how to do it I am sure.

Stepper Motor Music. Playing tunes / noise by using the motor in the floppy disk drive.

Anything else "strange" and unusual.

I always liked reset demos too but they were more common.

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Postby Marcer » Tue Jan 16, 2007 2:46 pm

the Led of the disk drives wasnt that hard to use as VU meters. I used that alot in my old gfa demo times..

but about the drive hmm.. Cant really remember that FX :)

but i think i remember you had to swing your joystick to speed up an scroller in a demo. :)

which was a bit erf..odd.

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Postby Bnicke » Tue Jan 16, 2007 3:00 pm

Stepper Motor Music was used in some C64 demos.. but I never heard of it on Atari ST.
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Postby alexh » Tue Jan 16, 2007 3:24 pm

I thought that one of the LED's wasnt supposed to be able to to be controlled by software (power LED) but I thought that someone was able to do it but I may be thinking about Amiga's (but the power LED is easy on the Amiga).

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Postby alexh » Tue Jan 16, 2007 4:12 pm

I dont see anyone posting the names of any Demo screens :(

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Postby Mug UK » Tue Jan 16, 2007 5:20 pm

I too remember some of the above effects from the C64 days - drive light and the light on the Action Replay cart as well as making the drive heads "sing" - but other than some badly written DMA loaders, I don't remember the ST drive motor being abused that way.
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Postby Zorro 2 » Tue Jan 16, 2007 5:26 pm

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Postby Arch Deviant » Tue Jan 16, 2007 8:02 pm

I'm sure there was a demo which moved the drive motor backwards and forwards to make a chug chug sound. but after ten seconds your drive would be knackered so not a great effect to unleash on the unsuspecting public, i'll be buggered if i can remember what it was called tho... :(

(probably thinking of some old tosh I wrote ;)
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Postby PaulB » Tue Jan 16, 2007 9:07 pm

I do remember the floppy access light coming on with the bass in a demo. I also can't remember what it was called. I would say it was probably some demo off a cover disc, or perhaps dark side of the spoon, so-what or cuddley demo's. I'd only just received those 3 compil's via a pd supplier around that time.

Edit: From memory the demo had digi drums in it and an almost static screen with a statue where only the statues hands moved to bang the drums. The point of the demo I recollect was the digi drums as according to their scroller digi drums were impossible on an ST before they done it.

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Postby Mug UK » Tue Jan 16, 2007 11:31 pm

Sounds like the Knucklebusters conversion to me with that description PaulB?
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Postby Grunaki » Wed Jan 17, 2007 4:27 am

Thermopylae is now an Enemy Island!

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Postby Mug UK » Wed Jan 17, 2007 7:57 am

Don't know if that's 100% legit as some of the sound could have been added afterwards (the advent of YouTube and similar sites has caused me a lot of cyncism - everyone wants 15 minutes of fame!) but if it's 100% legit then that's a good video (and a dead scanner!) :)
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Postby atari_mark » Wed Jan 17, 2007 1:13 pm

PaulB wrote:I do remember the floppy access light coming on with the bass in a demo.


I did this effect on a few POV compilation disk menus. I can't remember which compilations but it is real easy to do.

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Postby NiceGuyUK » Wed Jan 17, 2007 9:18 pm

My menu screen on DMG CD 3 has a drive LED going with the music. CD 2 probably does too, its the same menu code :wink:
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Postby NiceGuyUK » Thu Jan 18, 2007 10:50 am

NiceGuyUK wrote:My menu screen on DMG CD 3 has a drive LED going with the music. CD 2 probably does too, its the same menu code :wink:


And here they are...
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Postby Mug UK » Thu Jan 18, 2007 11:44 am

Mentioned about the disk drive noise on another retro forum and someone remembered the name of the demo on the C64 which "sang" Daisy Daisy to the user via their disk drive!

Wouldn't reckon that drive being able to read a great deal after the program was run though!

Still none the wiser as to Alex's original post. Drive LED light was fairly easy to do but doesn't seem that there were any other "original" odd effects done on the ST.

Unless Ijor has got some code that he knows of that makes the ST drive "sing" ?
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Postby NiceGuyUK » Sat Jan 20, 2007 12:42 pm

Just checked the two menus again while I wait for a download - it looks like I was wrong and the drive LEDs don't go with the music after all. Sorry - must have been where it was still loading from the disk that made me think it was.
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Postby Gunstick » Tue Feb 20, 2007 7:00 pm

some ULM demos with chip music have the 3 YM channels playing on 3 LEDs!

No, not the power led.
It's Floppy1, Floppy2 and CarrierDetect on the modem!

Most, or all, of the ULM digisound playing demos have the digital sound output onto the parallel port. Just connect a D/A converter to the 8 data lines on the parallel port and you have better quality gigisound.

I have a program called "BigY" which changes the GEM desktop to run with the lower border opened. Just slight flickering on floppy access.

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Postby guythp » Tue Feb 20, 2007 10:35 pm

Gunstick wrote:some ULM demos with chip music have the 3 YM channels playing on 3 LEDs!

No, not the power led.
It's Floppy1, Floppy2 and CarrierDetect on the modem!


That's it! I remember there being a demo that flashed the LED lights on my floppy and external (never had a modem, though).

The disk drive grinding was on the amiga, some demo played the american anthem or somethign silly like that.. As we all remember it had a god awfully loud floppy. I was very nearly honestly scared the first time I heard my mates amiga chugging away at a game - I looked at him to see if something was wrong, but all seemed normal.. Don't let SainT's flopppy emulation fool you, the ST's was whisper quiet in comparison.
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Postby karlm » Wed Feb 21, 2007 5:44 am

Gunstick wrote:Most, or all, of the ULM digisound playing demos have the digital sound output onto the parallel port. Just connect a D/A converter to the 8 data lines on the parallel port and you have better quality gigisound.


Gunstick : one like this?

Code: Select all


    3. HOW TO MAKE AN EVEN CHEAPER D/A
    ─────────────────────────────────────────────────────────

    For the price of 20 1% resistors and a plug, with no power supply
    needed you can make a D/A converter that sounds close to the IC
    one above (it seems only the UK can get a Plessey ZN426E)

    You need one plug for your amp, one for your parallel port and
    9 20k and 9 10K resistors
    Use 1% resistors if possible ─ and 20k sound much better than 22k

          Printer Port:

          signal   pin        20k   20k
          D0       2      >───░░░─┬─░░░──0v
                              20k ░ 10k
          D1       3      >───░░░─┤
                              20k ░ 10k
          D2       4      >───░░░─┤
                              20k ░ 10k
          D3       5      >───░░░─┤
                              20k ░ 10k
          D4       6      >───░░░─┤
                              20k ░ 10k
          D5       7      >───░░░─┤
                              20k ░ 10k
          D6       8      >───░░░─┤
                              20k ░ 10k
          D7       9      >───░░░─┤
                              20k ░ 10k  100nF
                                  ├──────┤█────> TO AMPLIFIER
                                  ░ 10k
          GND      20     >───────┼────────────>
                                  0v
         
     Thanks to Harry Stox for the above circuit.  Again, make sure all
     the 0v lines are connected together.  The 100nF capacitor may not
     be needed, try removing it if this circuit sounds poor.


Damn I feel old, I can remember when that was cool because there were no sound cards :)

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Postby Gunstick » Sun Feb 25, 2007 2:03 pm

yes, this one (see attached pic)
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Postby karlm » Sun Feb 25, 2007 10:00 pm

cool. Soldering iron coming out tonight :)

which demos should I try Gunstick?

cheers

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Postby tobe » Mon Feb 26, 2007 12:49 pm

Uh, well, err... Can I have more details please? :)
Looks good, is the quality really better?
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Postby alexh » Tue Feb 27, 2007 10:29 am

Wings of Death supports one of these too.

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Postby bullis1 » Sun Mar 11, 2007 8:43 pm

Does anyone have any better schematics for the parallel D/A above? I'm not really getting that ASCII diagram. I want to play the digi music from Lethal Xcess through one of those.

Also, do you have the full docs that you quoted from, karlm?

Thanks in advance.


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