Omnimaga

Calculator Community => Other Calc-Related Projects and Ideas => TI Z80 => Topic started by: Keoni29 on October 27, 2011, 05:11:00 am

Title: TI84+ Generating Video!!
Post by: Keoni29 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.
Title: Re: TI84+ Generating Video!!
Post by: Sorunome on October 27, 2011, 12:17:52 pm
haha, nice! :)
Title: Re: TI84+ Generating Video!!
Post by: DrDnar on October 27, 2011, 12:26:12 pm
Ben Ryves already did a proof-of-concept to that effect. (http://benryves.com/projects/pal) Have fun---projects like this can really teach you a lot.
Title: Re: TI84+ Generating Video!!
Post by: aeTIos on October 27, 2011, 02:25:36 pm
Seems a cool project either. Did you use a FULL?
Title: Re: TI84+ Generating Video!!
Post by: apcalc on October 27, 2011, 04:58:40 pm
Very nice!  Great work! :)
Title: Re: TI84+ Generating Video!!
Post by: Keoni29 on October 27, 2011, 05:02:22 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
Title: Re: TI84+ Generating Video!!
Post by: DJ Omnimaga 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?
Title: Re: TI84+ Generating Video!!
Post by: Keoni29 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