Re: Hardware emulation of 6509 using 6502?

From: Mia Magnusson <mia_at_plea.se>
Date: Mon, 23 Jul 2018 22:41:34 +0200
Message-ID: <20180723224134.00007ecd@plea.se>
Den Sat, 21 Jul 2018 14:21:47 +0200 skrev Michał Pleban
<lists@michau.name>:
> Jim Brain wrote:
> 
> > If desired, I can leave the $0/$1 functionality in place while in
> > '816 mode, but it seems very limiting and confusing to keep it in
> > when you can read from any bank directly using the 24 bit
> > addressing of the '816.
> 
> No, the $00/$01 registers definitely should not be visible in the
> 65816 mode. I just wasn't clear how the startup works.

The only important thing is that they are in a known state when
returning from full 65816 mode to 6509 emulated mode. But I assume they
already are set to $F when reset and they will keep their values when
hidden/ignored.

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Received on 2018-07-23 23:02:16

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