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

From: Spiro Trikaliotis <*ml-cbmhackers_at_trikaliotis.net*> Date: Mon, 2 Mar 2015 08:39:32 +0100 Message-ID: <20150302073932.GA26850@hermes.local.trikaliotis.net> · ml-cbmhackers_at_trikaliotis.net

Hello,

I know that the c264 series machines perform banking via accesses to the
$FF3E / $FF3F memory addresses. $FF3E seems to bank in ROM, $FF3F banks
in RAM.

What is unclear to me, and I have not found much sources about it:

1. Does it have to be memory writes, or does a memory read suffice?

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?

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

Any help would be highly welcome.

Regards,
Spiro.

-- 
Spiro R. Trikaliotis
http://www.trikaliotis.net/

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