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tVIstec 20 by Orb [web]
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popularity : 57% |
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alltime top: #10537 |
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added on the 2013-11-15 17:59:59 by ultra  |
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popularity helper
comments
could someone plz add orb as group ?... somehow that got lost...
pouet is damn slow here atm...
pouet is damn slow here atm...
holy shit video link is: http://www.ultrafex.de/tVIsteC20/tVIsteC20.avi
sound is kinda unnecessary imho. looks great! (=
Group and video link added. Nice looking twister, good stuff as usual! :)
thx ;)
Oh, quite nice. Liked the sound also.
Yup, does twist. Sounds nice too.
Nice :) (from video, link is 404)
Loved the nfo as well :)
Loved the nfo as well :)
Pretty good!
nice twister, "music", 256b on vic... yeah, i think that deserves a thumb up. Several even. But I only have 2, and pouet only allows one (why, when I have 2?).
ULTRA is... ultra! :D
oi.
One good thing done!
but does anybody got the file itself? I got 404 by pressing on the Download-Button...
thanks for pointing me to the actual VIC file...
thanks for pointing me to the actual VIC file...
I have fixed the download link.
thx...
hm seems to be a bug with the link... if you do not add http:// infront of the url or so...
hm seems to be a bug with the link... if you do not add http:// infront of the url or so...
No, that wasn't the problem, the spelling of the file name was wrong (lower case 'c' vs upper case 'C'). :)
oh... didn't see that...
but i was talking about the video link in the first comment... this one is correct and gives a wrong link looks like a link inside of pouet...
but i was talking about the video link in the first comment... this one is correct and gives a wrong link looks like a link inside of pouet...
just converting the source to Atari8... clever usage of VIC-1 hardware... (8 chars wide screen etc).
maybe after 20 years of 6502 coding... I don't get the magic trick here: ;=)
LDA sintab,x
LDY sinpostab,x
LDA sinbittab,x
STA (scrpos),y
...
I compared the plot routine in vice monitor and source code and it seems no typo... or is the unnecessary LDA sintab,x there for "slowing down" the code??? :D
maybe after 20 years of 6502 coding... I don't get the magic trick here: ;=)
LDA sintab,x
LDY sinpostab,x
LDA sinbittab,x
STA (scrpos),y
...
I compared the plot routine in vice monitor and source code and it seems no typo... or is the unnecessary LDA sintab,x there for "slowing down" the code??? :D
oh...there is no magic in there... indeed that makes no sense...
seems i didn't see the useless lda sintab,x ;)
but be careful some variables @$40-$50 needs to be 0 maybe on atari8 they aren't 0 ... otherwise you will get wrong results.
on vc20 the system clears some of them and i'm using the $0 ones...
seems i didn't see the useless lda sintab,x ;)
but be careful some variables @$40-$50 needs to be 0 maybe on atari8 they aren't 0 ... otherwise you will get wrong results.
on vc20 the system clears some of them and i'm using the $0 ones...
ok. runs on A8...
only thing is the damned 128 char limit vs 256 VIC has... but next step will be to go bitmap mode anyway ;)
only thing is the damned 128 char limit vs 256 VIC has... but next step will be to go bitmap mode anyway ;)
another question regarding your sin generator... it is a simple approxmiation and can this be adjusted? f.e. instead of 64 pixel wide half of amplitude or 40x amplitude?
(ok... I could use the sin-generator build in assembler but well... just wondering).
(ok... I could use the sin-generator build in assembler but well... just wondering).
cool @a8... if done send me the source ;)
it can be adjusted ... tmp1 is the start value. in my case it's $100 and sbc #4
$100 sbc #4 ->64
$c0 sbc #3 -> 48
$80 sbc #2 -> 32
$40 sbc #1 -> 16
other values will not create a clean "sin"...
it can be adjusted ... tmp1 is the start value. in my case it's $100 and sbc #4
$100 sbc #4 ->64
$c0 sbc #3 -> 48
$80 sbc #2 -> 32
$40 sbc #1 -> 16
other values will not create a clean "sin"...
i mean you always have to double or half both start value and sbc... if not the sin is not clean...
no... ;) sorry this is more correct...
amp = n * 16
startvalue = n * $40
sbc = n
for example... if you want a 128 wide sin:
amp = n * 16
n = amp / 16
n = 128 / 16
n = 8
startvalue = 8*$40 -> $200
sbc = 8
amp = n * 16
startvalue = n * $40
sbc = n
for example... if you want a 128 wide sin:
amp = n * 16
n = amp / 16
n = 128 / 16
n = 8
startvalue = 8*$40 -> $200
sbc = 8
ok. thanks... will do... I can send you the WIP already. E-Mail-Adress?
everytime I touch VIC code I love the machine... simple but the VIC is so flexible...
everytime I touch VIC code I love the machine... simple but the VIC is so flexible...
ultrafex1 at gmx.de ...thx... maybe i'll do something on it again...
yeah vc20 is cool... but unforunately a bit too less memory limits you quite often... esp in music and stuff... but on the other hand that's the challenge...
@love how about doing a demo on it ? ;)
yeah vc20 is cool... but unforunately a bit too less memory limits you quite often... esp in music and stuff... but on the other hand that's the challenge...
@love how about doing a demo on it ? ;)
sent...
cool
yes
submit changes
if this prod is a fake, some info is false or the download link is broken,
do not post about it in the comments, it will get lost.
instead, click here !
tVIsteC 20 ... A 256 byte twister for vc20 with sound
So far i know there is no 256 byte twister on VC20 yet... Hm even no 256 byter ? Strange...Anyway
As you can see looks very like the twistex twister i did for vectrex but the code is quite different. The video setup and drawing is a lot more complicated on VC20. Also the VC20 has a 6502 and vectrex a 6509. 6509 has 16 bit registers quite cool Cpu besides...
For those not having the real machine, you can try Vice emulator with the proper settings (no expansion memory, 5kb of ram) or else it won't run: Settings -> Vic settings
Video can be found here:
www.ultrafex.de/tVIsteC20/tVIsteC20.avi