Re: Gforth BLOCK 0

Bernd Paysan <[email protected]> Sat, 06 Aug 2022 16:48:30 +0200

Newsgroups	gmane.comp.lang.forth.gforth
Message-ID	<12033212.O9o76ZdvQC@liubei>

Am Samstag, 6. August 2022, 16:39:06 CEST schrieb Josh Grams:
> IIRC 0 isn't a valid block number: for instance,
> 
> http://forth.sourceforge.net/standard/dpans/dpans7.htm#7.6.1.1790 LOAD
> says "An ambiguous condition exists if u is zero or is not a valid block
> number."
> 
> I believe in some systems blocks were actually the raw disk, so the
> bootloader would be in block zero and thus it wasn't available for
> source code? I could be totally wrong about that.

Originally, in Gforth, block 0 did not exist, for that reason.  However, other 
systems had block 0, which you just couldn't load from, so we changed the 
block numbering scheme to accommodate that.  But the code was written around 
the assumption that block 0 does not exist.

Fixed in current git head.

-- 
Bernd Paysan
"If you want it done right, you have to do it yourself"
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