[Coco] BASIC irony
John R. Hogerhuis
jhoger at pobox.com
Thu Aug 12 19:07:05 EDT 2004
On the Model 100, ' is actually 3 bytes not two: $3A$8E$FF
Apparently it's different for Coco though?
Another bit of strangeness is ELSE which always gets a separator $3A in
front of it as well.
I am writing a Tandy Portable Disk Drive emulator for the Palm to be
used with Model 100 laptops ( http://bitchin100.com/dlpilot ). As a
convenience, it converts .BA files and .DO files to editable PalmDoc
.pdb files, and back again.
Have you started on the tokenizer? I haven't written that portion yet. I
guess an inefficient algorithm is simple, for each character, loop
through the token table and compare characters; if get a match then put
the token instead of just text. Otherwise just put the character as-is.
The exceptions are of course for :else and ' and ignore-to-EOLN handing
Other strangeness in LIST comes with hidden high-numbered lines.
On Thu, 2004-08-12 at 10:02, tim lindner wrote:
> I am in the process of writing a tokenizer/de-tokenizer for Boisy's CoCo
> Tools project and I have run accross something interesting.
> Everyone knows that the apostrophe is a short cut for the REM keyword.
> The the irony is that the apostrophe is tokenized as two bytes where the
> REM keyword is tokenized as one.
> BASIC changes the apostrophe to a colon-apostrophe. I would guess the
> interrupter can only handle an apostrophe at the beggining of a new
> During a LIST command BASIC drops the initial colon, so it is never
> tim lindner
> tlindner at ix.netcom.com
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