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From: fisher@dvinci.DEC
Newsgroups: net.micro.atari
Subject: Where is the memory?
Message-ID: <1055@decwrl.UUCP>
Date: Mon, 11-Mar-85 16:50:56 EST
Article-I.D.: decwrl.1055
Posted: Mon Mar 11 16:50:56 1985
Date-Received: Fri, 15-Mar-85 02:18:20 EST
Sender: daemon@decwrl.UUCP
Organization: DEC Engineering Network
Lines: 39

<Sacrificial line>

I recently upgraded from an Atari 400 w/32K to an 800XL with the full wad of
64K.

What I thought was strange was that when I tried my LOGO cartridge, it showed
no more nodes (memory available) than I had with my 400.

I tried the following algorithm in both LOGO and the builtin basic:

    address = 0
    loop while (address < 64K)
	temp = peek(address)
	poke address,127	!Put distinguishable number in mem loc
	if peek(address) = 127 then print "ram",address
				else print "rom",address
	poke address,temp
	address = address+1024
	end loop

As expected, Basic showed 40K of RAM available (40-48K=basic code,
48-64=OS ROM, hardware registers, etc etc).  The odd thing is that LOGO
showed there to be only 32K.

My old hardware manual says that RAM is usable between 32K and 40K if there
is no right cartridge in the non-XL 800.  Is an 800XL different?  Is a LOGO
cartridge different (has 16K?)

BTW, is there any software which uses the memory above 40K by bank-switching
or whatever?

Burns


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