20 Sep
2015
20 Sep
'15
7:47 a.m.
On 20 September 2015 at 13:54, Peter Coghlan <cctalk at beyondthepale.ie> wrote:
BBC BASIC (when running on a BBC Micro at least) does
clear (most) variables
when a program is loaded. Most variables are stored in memory above the
program and if a small program was replaced by a larger program, some could get
overwritten. Acorn may have decided that it was too much trouble to figure out
whether or which variables might be affected and that it was easier to be safe
by clearing them every time a program is loaded.
BBC BASIC (on a BBC Micro) doesn't have a MERGE command or equivelant either
but it is possible to merge programs together using slight hackery. However,
once BASIC is made aware of the change, it will clear the variables so a
certain level of deviousness is required to do stuff like overlays.
Hmmm. I'm now wondering if the command was CHAIN not LOAD...
--
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