Re: Test suite for 6509 processor

From: smf <*smf_at_null.net*> Date: Mon, 26 Feb 2018 08:18:09 +0000 Message-ID: <5732f1d4-24c6-2964-7dc7-ef1a77174eb2@null.net> · smf_at_null.net

On 25/02/2018 23:19, Mia Magnusson wrote:

> If the IPC code is in bank 15, then the incorrect write would end up at
> adress 0 and 1 in bank 15, which I assume is not a place where the 8088
> wants to read/write from disk. So the 6509 IPC disk I/O code should
> work even when crossing page boundaries.

 From my understanding of what has been said here:

Writing to 0 in any bank will cause the 6509 to start executing code in 
another bank & there won't be any code there for it.

The value written to 0/1 in any bank doesn't end up in ram because the 
cpu doesn't drive the data bus.

But maybe I'm wrong.

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