pouët.net

There Are No Limits by Noice [web]
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screenshot added by Sdw on 2009-12-20 12:05:51
platform :
type :
release date : december 2009
  • rulez 37
  • is ok 2
  • sucks 0
popularity : 58%
 58%
  • rulez 0.95
alltime top: #4144
added on the 2009-12-20 12:05:51 by Sdw Sdw

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Here's a little early Christmas present from me - another attempt to explore the ZX81 from a democoders point of view!

YouTube video captured from real hardware.
added on the 2009-12-20 12:07:14 by Sdw Sdw
n0ice
rulez added on the 2009-12-20 12:54:26 by the-other-pigpen the-other-pigpen
delivers!
Totally incredible work! Many thanx for Your effort.
Keep the ZX81 alive!!!!
rulez added on the 2009-12-20 13:43:09 by YERZMYEY/H-PRG YERZMYEY/H-PRG
!
rulez added on the 2009-12-20 15:59:49 by PENETRATOR PENETRATOR
tnx shadow :)
that twister looks totally like chrome :)
superb work once again !
rulez added on the 2009-12-20 16:02:53 by ɧ4ɾɗվ./Lemon. ɧ4ɾɗվ./Lemon.
nice effect(s)!
rulez added on the 2009-12-20 16:32:00 by toxie toxie
rulez added on the 2009-12-20 16:41:15 by p01 p01
nice one
rulez added on the 2009-12-20 16:51:53 by v3nom v3nom
rulez added on the 2009-12-20 17:39:37 by Buckethead Buckethead
Given that the machine seems to be completely hopeless to code for, this is pretty awesome :)
rulez added on the 2009-12-20 18:46:16 by evil evil
WOW
rulez added on the 2009-12-20 18:47:55 by BackSpace BackSpace
Nice twister!
rulez added on the 2009-12-20 18:58:52 by ham ham
Fucking wow!!
rulez added on the 2009-12-20 19:03:28 by CiH CiH
nice
rulez added on the 2009-12-20 20:56:32 by Insectecutor Insectecutor
looks good
rulez added on the 2009-12-21 05:01:38 by blala blala
Nice exploration :)
rulez added on the 2009-12-21 05:44:17 by Gʀɪʍʍy Gʀɪʍʍy
Video is nice nice :)

Now I wonder if it's possible to run this on the NTSC zx-81 [aka the timex sinclair 1000]. Shall give that a shot
rulez added on the 2009-12-21 06:07:27 by micksam7 micksam7
Yeah Greaaaaaaaaaaaaaat !!
i was a proud owner of that machine a long time ago
and i can't believe what i see .

simply Incredible
rulez added on the 2009-12-21 08:43:05 by _wheely_ _wheely_
whoah!

btw that is one keyboard i do not miss ;)
rulez added on the 2009-12-21 10:38:03 by nerve nerve
micksam7: it should work without problems.
I actually doubt that it would run correctly on an NTSC machines, as they have quite a bit less cycles available in the non-display area.
added on the 2009-12-21 10:49:57 by Sdw Sdw
super
rulez added on the 2009-12-21 12:29:38 by joker_ joker_
yep!
rulez added on the 2009-12-21 12:33:10 by kyv kyv
That's quite impressive.
rulez added on the 2009-12-21 12:58:57 by micdune micdune
Sdw: yes, You're right, it loses synchro on the bottom of the screen on Timex Sinclair 1000 but still the errors are not very visible and it still looks OK. Especially that ZX81/TS users will be happy to have any new demo at all, heheh. :)
It really looks not bad.
nice
rulez added on the 2009-12-21 15:43:01 by psenough psenough
Actually, it looks rather excellent on a timex 1000 :) A few errors here and there, but only at the end of each effect, it also runs about half the speed but still is more than watchable.
added on the 2009-12-21 17:27:12 by micksam7 micksam7
rulez added on the 2009-12-21 18:44:36 by Alpha C Alpha C
kewl
rulez added on the 2009-12-21 19:25:52 by gentleman gentleman
As usual :) Sdw's 1st fan !
rulez added on the 2009-12-21 20:50:03 by Shazz^TRSi^MJJ Shazz^TRSi^MJJ
yet again...excellent!
rulez added on the 2009-12-21 22:46:11 by button button
Nice but a bit repetitive...
rulez added on the 2009-12-22 22:13:18 by Defiance Defiance
Actually it isn't repetitive - it's simply looped. And it's very good, as the computer has no sound by itself.
added on the 2009-12-22 23:56:28 by johny johny
I wouldn't have believed that was possible. Great stuff.
rulez added on the 2009-12-31 09:18:50 by auld auld
I have absolutelly no idea how is it done, but it rules for sure!
rulez added on the 2009-12-31 10:40:29 by Aki Aki
great stuff :)
rulez added on the 2010-02-26 03:56:00 by shock__ shock__
well done
rulez added on the 2010-06-20 19:33:36 by Sir Sir
Hi SDW, this is absolutely nice. How the heck did you do this. I remember my ZX 81 (I soldered it together myself - also the reason why it died years later ;-) could read charset data only from the ROM, but also the CPU was involved somehow. Seems you managed to override what the CPU does. Great job!
rulez added on the 2010-09-25 23:26:48 by JAC! JAC!
rulez
rulez added on the 2010-09-25 23:44:40 by rudi rudi
Thumb for your work and micksam7's test aswell :)
rulez added on the 2010-09-26 00:18:13 by ferris ferris
JAC: You're correct that on the ZX81 the CPU is responsible for outputting the gfx aswell, meaning that as soon as you have something onscreen, the CPU is occupied by that, so once you have gfx on the screen, the only available CPU time is in the blank area below and above the screen.
You're also correct that the ZX81 can only display ROM (unless you solder in some mods = cheating). But by selecting the right ROM area, and overriding the video-output routine with your own code that fetches a new char every rasterline routine you can get a 256x192 pixels pseudo-hires mode. That has been known since the early days of the ZX81.
However, trying to update 32x192 bytes every frame when the only free cpu time is in the border is not doable of course.
The new invention (wohoo, I always wanted to do a world-first!) in this demo is that with some more trickery I get a mode where I can pick from predefined 256x1 pixels lines, and thus only need to update 192 bytes per frame to get these effects running full framerate.
added on the 2010-09-26 18:56:02 by Sdw Sdw
whreee
rulez added on the 2010-11-13 18:29:59 by xeron xeron
aw yeah.
rulez added on the 2011-01-20 00:51:03 by comankh comankh

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