Cool AppleSoft BASIC trick I never thought of before

From: Vintage Computer GAWD! <foo_at_siconic.com>
Date: Wed May 17 15:06:46 2000

On Wed, 17 May 2000, Pete Turnbull wrote:

> Yes, probably :-) Since you wouldn't need much code, and nothing on a
> standard Apple uses interrupts, you could go one further and make it a
> time-sliced system instead of a cooperative one, with a very simple circuit
> (not much more than a 555 timer, though you might want it on a card with a
> PROM to hold the code).

I considered this. An easier way to do this is to copy the BASIC ROM into
RAM in the upper 16K bank of memory and then modify the interpreter to
switch after the execution of each BASIC program line.

Sellam
Received on Wed May 17 2000 - 15:06:46 BST