Re: Hardware emulation of 6509 using 6502?

From: smf <smf_at_null.net>
Date: Mon, 16 Jul 2018 23:20:49 +0100
Message-ID: <e7f5bbd9-b9b1-ea97-53ad-655014289eb0@null.net>
On 16/07/2018 16:28, Jim Brain wrote:
> Note that the '816 does not offer an SO pin, and I see no way to emulate it on
> the '816 using the CPLD.  I will, though, try to route the pin through the CPLD
> and optionally connect it when non '816 configuration is selected.

You could route it to the abort input, it's not going to be as fast as 
it pushes registers and then jumps to ($ffe8). But you could write code 
that sets the overflow flag and returns, so that applications might work.
Received on 2018-07-17 01:00:04

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