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Offline Keoni29

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TI84+ Generating Video!!
« on: October 27, 2011, 05:11:00 am »
I really don't know if it's possible to generate a proper 1-bit video signal with a TI 84+, but I ran some tests and this is my best result:

It alternates the linkports' state rapidly, but it's still too slow to generate a full white screen. I used AXE, but I think I have to use very optimized ASM to generate better video. Even then it won't be possible to do anything else but video playback.
« Last Edit: October 27, 2011, 05:11:35 am by Keoni29 »
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Offline Sorunome

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Re: TI84+ Generating Video!!
« Reply #1 on: October 27, 2011, 12:17:52 pm »
haha, nice! :)
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Offline DrDnar

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Re: TI84+ Generating Video!!
« Reply #2 on: October 27, 2011, 12:26:12 pm »
Ben Ryves already did a proof-of-concept to that effect. Have fun---projects like this can really teach you a lot.
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Offline aeTIos

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Re: TI84+ Generating Video!!
« Reply #3 on: October 27, 2011, 02:25:36 pm »
Seems a cool project either. Did you use a FULL?
« Last Edit: October 27, 2011, 02:25:50 pm by aeTIos »
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Offline apcalc

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Re: TI84+ Generating Video!!
« Reply #4 on: October 27, 2011, 04:58:40 pm »
Very nice!  Great work! :)
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Offline Keoni29

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Re: TI84+ Generating Video!!
« Reply #5 on: October 27, 2011, 05:02:22 pm »
Quote from: aeTIos on October 27, 2011, 02:25:36 pm
Seems a cool project either. Did you use a FULL?
Yes I did :( Pure optimized asm might do the trick, cuz I got big white scanlines when I rubbed the wire over the battery
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Offline DJ Omnimaga

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Re: TI84+ Generating Video!!
« Reply #6 on: October 27, 2011, 05:29:21 pm »
Interesting. I'M curious how much this can be pushed in terms of graphical display. I remember seeing Benryves' project a few years ago and was amazed.

By the way does this work only on PAL TVs or will it work on NTSC ones too?
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Offline Keoni29

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Re: TI84+ Generating Video!!
« Reply #7 on: October 28, 2011, 12:52:02 pm »
It's actually easier on ntsc tv's cuz it's a lower frequency thats needded. I really dunno if it matters since modern tv's support both
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