Re: 6509 questions

From: Ullrich von Bassewitz <*uz_at_musoftware.de*> Date: Tue, 16 May 2023 21:44:37 +0200 Message-ID: <20230516194437.GA572503_at_trixie.musoftware.de> · uz_at_musoftware.de

On Tue, May 16, 2023 at 09:17:09PM +0200, Rhialto wrote:
> About the banking of the 6509: If you use the STA (zp),Y instruction to
> the effective address $0000 or $0001, does it store in the banking
> register, or does it store in RAM? 

I think there's no way easy way to test this, at least not with a naked 6x0
because the CPU cannot access the underlying RAM at these addresses. 

Maybe someone with a coprocessor card can run a test? Or someone with a bus
analyzer? I don't know if this has ever been researched.

Regards

        Uz

-- 
Ullrich von Bassewitz                                  uz_at_musoftware.de
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