re: A83: OS Pic Vars


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re: A83: OS Pic Vars




PIC vars were intended to save an image of the graph screen.
The graph screen doesn't include the lasr column and last
row of pixels. This was done so that in the "standard" viewing
window the point (0,0) would land on a pixel and not between 2
which is the case on the TI-81 that has an even # of pixels for
each direction, we screwd that one up. 

The last row of pixels was not saved just because it was a waste
of bytes. At the time we had no idea that PIC vars would be used
for anything other than storing graph screen snap shots.

Sorry. 

Later,
Pat

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Original text

From: Jkhum98@aol.com, on 5/16/99 12:35 PM:

Does anyone know why the OS doesnt allow for the far right verticle line to 
be drawn to on the Graph Screen, also the lowest horizontal line?  In 
assembly when you write to every place on the buffer and store it to the OS's 
pic var, it will keep the far right data (except for the top right corner 
which gets erased because of the run indicator), yet the far bottom line gets 
wiped out. Does anybody know TI's intentions for making pic vars only 756 
bytes and not 768, and is there any way around it to create a pic var which 
saves the last line as well? Thanks...

Jason_K



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