E: screen editor source code?

[Cybernoid]

Does anyone have the E: source code? Is this in the OS Manual?

[Rybags]

Atari released the Source for the OS back in the 400/800 days.

 

AFAIK, they never did the same for the XL OS, but there is one available - I think someone else reverse-engineered and added comments.

 

It should be essentially the same for all OS versions - the major differences for the XL:

- availability of fine-scrolling, although I believe most of that is handled by the Stage 2 VBlank

- clear screen bug supposedly fixed (clear screen on older models often wiped memory beyond where the screen ended)

 

Of course, there's also the fact that E: is mainly a hybrid of S: and K: so some differences there too:

- extra graphics modes for S:

- extra key functionality for K: Help key, and Function key support actually exists in other XL and XE ROM versions.

 

Here we go. OS Source for 400/800, and XL Rev 5

[Cybernoid]

Awesome! I thought I had seen that, but I didn't search the forum for the right keywords...

 

As always, Rybags, you have proven to be an excellent technical source...

 

Thanks!

[thorfdbg]

Does anyone have the E: source code? Is this in the OS Manual?

Not the "original" since that was never released, but you find one here:

 

http://www.math.tu-berlin.de/~thor/atari++/

 

Download os++.tgz, you'll find the E: handler in "editor.asm". This release fixes a couple of bugs of the 400/800XL editor handler, most notably that

even this handler had a bug in overwriting memory behind RAMTOP when inserting or removing lines. This usually doesn't matter as there's ROM

space, but nevertheless it got fixed. Furthermore, the editor also creates a buzzer sound when the line grows too long when inserting characters

(the original one just overrun the buffer). A couple of other minor details have been fixed (window size is flexible, E: is decoupled from S: and

some others).

 

So long,

Thomas

[Cybernoid]

Thanks Thomas.