[TI ASM] Bug in VPutMap?

Maelstrom · Post by **Maelstrom** » Sat 21 Oct, 2006 12:40 am

When I output a null character with VPutMap, sometimes it displays nothing (like you would expect), but sometimes it displays a garbage character.

Hex codes
Characters

Look at the 00s on the bottom of the first picture. Some of those on the right appear as garbage.

Is this a known bug in VPutMap?

Jim e · Post by **Jim e** » Sat 21 Oct, 2006 1:21 am

Bug? Thats not a bug thats a feature.

Its probably displaying some leftovers in the ram. If Im right Ti is using there lame HtimesL rountine to calc the offset of the font character. So rather than get the very first charater its getting beyond the last character. If thats in the ram anything could end up getting displayed.

Ofcourse Im guessing. Either way just catch 0 and anything beyond $EC, as there shouldn't be any font characters there(or atleast none that we were told about).

Maelstrom · Post by **Maelstrom** » Sat 21 Oct, 2006 1:38 am

Hmm, usually I hear 'feature' used as a euphemism for 'bug'... Then again, that was probably what you meant.

Yes, the workaround is very easy. We shouldn't need one, but at least it's easy.

Saibot84 · Post by **Saibot84** » Sat 21 Oct, 2006 6:13 pm

I wonder if anything worthwhile could be displayed using this "feature".

King Harold · Post by **King Harold** » Sat 21 Oct, 2006 6:22 pm

Ofcourse you can, you would know what the memory around the characters looks like.
<completely insane thought> you could even make your own characters that way! but you would probebly crash your calc if you didn't restore it to that exact same state as you found that piece of memory in, so save a copy of it somewhere, which would mean its completely useless to do. </insane thought>