🚀 go-pugleaf

In article <wZfVc0200...@andrew.cmu.edu>, sa...@andrew.cmu.edu (Sudheer Apte) writes:
> The BASIC not only allowed any characters inside comments, but added
> its own control codes to the basic screen driver routines (the BASIC
> was resident in a ROM and loaded up at boot time along with the OS,
> so the machine was always in BASIC expr-eval mode), making it possible
> to save an ascii file full of control characters and simply EXEC'ing
> it from BASIC... What we did was: wrote a nice long program to do
> graphics on the screen, and exit with a taunt to ``try reading the
> code to discover how this is done!''. Here's the program:

I used to have fun poking a Commodore PET basic program so that the
only lines that LISTed were ones that were not the target of a GOTO.
These had to be contained in the linked list because the interpreter had
to be able to search for them; but sequentially executed statements could
be left out of the list because it just kept going and didn't search for
the next line.

Unfortunately, I soon discovered that you couldn't SAVE a program this way.
When you LOADed it back, the links were restored. :(

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Roger Ivie

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