Date   : Sat, 04 Oct 2008 21:38:53 +0100
From   : afra@... (Phill Harvey-Smith)
Subject: Save location for temp variables.

Hi again,

Firstly thanks for all those who replied to my request for a PC 
assembler, finally settled on BeebAsm, as it seemed to fit what I needed 
most.

Ok, so next question is this, the ROM code I'm working on will need to 
store a couple of temp variables, I could request a page of private 
storage, but as at the moment I only need a few bytes, this seems like a 
  complete waste of 200+ bytes.

Next thought was to store them on the stack, but again with the 6502's 
limited stack I don't really want to put too much on there and also 
accessing them will get messy.

So is there a convenient place I can save a few bytes whilst in my ROM 
code ? This is mainly for parsing the command line passed to my 
commands, and the binary parameters for my code, e.g. I'm working on a 
command thus

*SRZAP <id> (<id>)

The command will blank the specified ram banks, but I need a place to 
store the bank numbers whilst reading them in and actually executing the 
command.

Cheers.

Phill.

-- 
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !

"You can twist perceptions, but reality won't budge" -- Rush.