[Coco] BASIC09 - How good is it?

[Luis Antoniosi (CoCoDemus)]

How to use mmu under os9 ?


On Tue, May 14, 2013 at 3:29 PM, Gene Heskett <gheskett at wdtv.com> wrote:

> On Tuesday 14 May 2013 15:26:22 Luis Antoniosi (CoCoDemus) did opine:
>
> > > Which needs one more, a CTRL+U to undo what you just did, in case that
> > > wasn't what you wanted to do.  Say 5 levels deep if memory can be
> > > found to save that much data.
> >
> > Undoing is not that simple when you can remove or duplicate entire
> > lines. If you look a text editor on PC it just save a full text
> > instance for each undo, what is not possible in the short coco's
> > memory.
> >
> > So for each action I should be able to undo-it , gets complicated when
> > lines are split or merged. It's not a $0D character in the middle we are
> > talking about but two separated double linked string lists that are
> > merged and possibly relocated somewhere else in the memory. Also
> > deleted lines should be kept for a while lingering somewhere, what
> > increases a lot the complexity.
> >
> All very true given the coco's 64k memory mapping, but another 8k block is
> only two lines of code away in the 3's.  One to allocate, one to deallocate
> at quitting time.  Making use of it would probably be another 100 lines of
> code though.
>
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>
> Cheers, Gene
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