Re: c264 series (c16/c116/+4) memory MAP and ROM banking

From: Rob Clarke <>
Date: Mon, 02 Mar 2015 09:18:48 +0100
Message-ID: <>
Hi Spiro,

> 2. What exactly is banked in? Looking at the ROM routines, I have the
>    impression that not all ROM can be banked out after an access to
>    $FF3F, right?

When you write to $FF3F, all the ROM is banked out but the I/O space 
remains visible. This means that the only RAM you cannot access is from 
$FD00 to $FF1F and the two pseudo registers themselves at $FF3E and 

> Furthermore, is there any complete memory map of the machines out that
> tells me what is visible where?

As well as the page table docs that Gerrit highlighted, another useful 
resource is the 264 Ultimate ROM Map by SVS :

It's not a disassembly but its pretty in depth documentation.

Cheers, Rob

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Received on 2015-03-02 10:00:39

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