I think there's some monkeying with the mappings at boot time (to map the ROM containing MOS into bank 0 to catch the reset vector) but after that it all remains where you'd expect. It all happens at $B04F in the MOS module which is in the rom labelled "0" in the mdfs.net files - I can't recall how ...

Sorry I meant to answer this topic when Ed prompted me but it slipped my mind.

You shouldn't need all of those COP calls to be implemented - I think the BBC Micro build and shim only do a handful

There's documentation of most of the Communictor OS here https://github.com/dominicbeesley ...

Thanks Hoglet,

Are the known differences listed anywhere?

I got a lot further than I expected yesterday evening and I'm on to the stack relative addressing modes now - I'm not clear when or how these should wrap in Emulation mode. Should the behaviour in 6502decoder be right for these cases. If ...

Yes, thanks Daryl.

I've got a way to go before my core is quite ready to tackle these tests (it passes Dormann NMOS and CMOS tests currently) but I'm looking forward to having a good test of edge cases. I'd particularly forgotten about the PLB wrap "feature"!

D

Hi, I'm experimenting with a 65816 vhdl core at the moment and this looks like just the thing to test it out. Do you have a link to the original as I didn't turn the up during my searches.

Thanks to BigEd for the pointer to this thread

D

Edit: I've found the original git by searching properly ...

Is the wiki dead...I see it still has an error. Is this something we need to raise money (or time) to help with housing?

Gratified to find that my unfinished Electron emulator passed! TBF I cribbed the pseudo-mico-code for the cpu from MAME.

Thanks Garth, trust BigEd to spot it first!

Hello,

The Visual 6502 wiki seems to be down - is this a known problem?

Not sure who to contact.

D