Oh ya...I forgot sub( can be used on numbers I'm always just used to using it on strings haha.

So Idecided to make a basic routine for doing the undo process. I'll type it up when I get home, currently at school waiting for class to start. I don't know how you were compressing your data so I just created my own way.

Edit:
Here is the example I made.
ZStandard
104→Xmax
72→Ymax
ZInteger
ClrDraw
For(A,0,31
Horizontal A
End
"L1(A→u
{100621062,301030,10059.1,20359.1,30759.1,110027.1,120327.1,130727.1,201059.1,201027.1,56.2,156.2,107252.3→L1
For(A,1,dim(L1
iPart(E2fPart(u/E2→Z
iPart(E2fPart(u/E4→X
fPart(u→C
If .1=Ans
Then
iPart(10fPart(u/E5→B
iPart(u/E5
If not(Ans
Pt-On(X,Z,B
If 1=Ans
Pt-Off(X,Z,B
If 2=Ans
Pt-Change(X,Z
End
If .2=C
Then
If X
Horizontal Z
If not(X
Vertical Z
End
If .3=C
Circle(X,Z,iPart(E2fPart(u/E6)),{i
If not(C
Line(iPart(E2fPart(u/E8)),iPart(E2fPart(u/E6)),X,Z,iPart(u/E8
End
Every time in that code that you see a capital letter "E" it is the scientific notation "E" and "L1" means L1. Also, I'll go over how I compressed the data:

If a element does not have a decimal part it is a Line( command, .1 is a Pt-On/Off/Change command, .2 is a Vertical or Horizontal command, and .3 is a Cirlce( command.

For Line(:
-Nine total stored numbers.
--First one is for it is drawing (1) a line or erasing (0).
--The next eight are the X1, Y1, X2, and Y2 coordinates (in groups of two), respectfully.

For Pt-On/Off/Change:
-Six total stored numbers:
--First one says what kind of command it is (Pt-On (0), Pt-Off (1), or Pt-Change (2)).
--Second number says what kind of point (dot (1), square (2), or cross (3)) (Only used for Pt-On and Pt-Off).
--The next for are the X- and Y-coordinates (in groups of two), respectfully.

For Horizontal and Vertical:
-Three total stored numbers:
--First one says what command it is (Horizontal (1) or Vertical (0)).
--The next two are the coordinate used (one two digit number).

For Circle(:
-Six total stored numbers:
--The first is the radius of the circle to be made (one two digit number).
--The next four are the X- and Y-coordinates (in groups of two), respectfully.

So, if you put the zeros back in the list would look like this:
{100621062,000301030,010059.1,020359.1,030759.1,110027.1,120327.1,130727.1,201059.1,201027.1,056.2,156.2,107252.3}

Hopefully that all makes sense. Also, I'm sure there are some optimizations that could be made to that, I just made it real fast for the sake of an example so wasn't really trying to optimize.

Um, gee, I appreciate the effort, but I already have code. I have 3 vars, V,X,theta (because ClrDraw screws up Y). They're compressed into one list element at the end of the loop, and a single var, L, is used as a flag denoting which set of coords the program is on for LineOn/Off and Circle, and the First set of coords is stored in L₁. V is the command number, in order from 1 to 8: Pt-On/Off/Change Line(On/Off) Circle Horizontal Vertical.
And that's the most documentation on this program ever.

What do you find confusing?
I have a character limit on my posts right now, which is why I'm not posting code at the moment.

Weird, posts are limited to 50000 characters I think, which should be more than enough to post code. Otherwise you could simply use pastie.org or something.

Surely there's specific code responsible for each element of your program and you've identified which elements aren't working?

The low char limit's just for me, 'cause I'm special. (I'm posting from my PSP.)
But seriously, unless I know what doesn't make sense, I can't fix it so that it does make sense.

Oh ok, I see about the char limit.

Also when you can, could you check your forum inbox at http://www.omnimaga.org/index.php?action=pm ? Because I noticed some of your posts have questionable content (by Omnimaga T.O.S standards)

Oh, ok. I'll try to explain it better.
There are 4 variables:
V, which is the command number
X, the current X coord
theta, the current Y coord
L, a flag that indicates which pair of coords is being entered. It is used for all of the two coord commands
And L1, which stores the first pair of coords when a 2 coord command is being entered.
Elucidification:
coord=coordinate