Re: Test suite for 6509 processor

Den Tue, 27 Feb 2018 15:18:43 +0000 skrev smf <smf@null.net>:
> On 27/02/2018 12:27, Mia Magnusson wrote:
> 
> >
> > Agree. This is also why I'm thinking about some kind of simplified
> > hardware emulation of the 6525's for a (hypothetical) CBM-II
> > replica.
> 
> A replica that doesn't replicate the hardware would be rather odd. If 
> you can't get the original chips then a CPLD or FPGA would be more 
> interesting.

Is there any reason to emulate unwanted behavior / unusable features
of the original chips?

Being able to run all (or almost all) software, including the
Kernal/Basic, without any modification, seems good enough.

It seems rather useless to emulate the possibility of configuring parts
of the keyboard matrix as interrupt pins on U28 6525. Also while it in
theory might be some rare usage of configuring the interrupt pins as
plain I/O pins on U2 6525, it's really unlikely that any software will
do that.

> I'm looking forward to https://ultimate64.com/Ultimate-64 as it
> should be pretty easy to knock up a p500 or cbm2 core to run on it.

That seems like cheating. :)

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