Re: strange read with a 6502...

From: groepaz_at_gmx.net Date: Wed, 30 Mar 2016 10:19:37 +0200 Message-ID: <3183485.eeBgk0VLe3@rakete>

On Wednesday 30 March 2016, 10:06:21 didier derny <didier@aida.org> wrote:
> I have a problem with a read with a 6502
> 
> I read a data on a register (from a CH376S)
> 
> I have the following code:
> 
>                      *= 2000
> readdata      LDA    CH376data
>                       RTS
> 
> 
> this code always get  the wrong value
> 
>                      *= 2001
> readdata     LDA    CH376data
>                       RTS
> 
> 
> now with this code I get the right value...
> 
> I have a diffent result with a 6502 from:
> 
> mos technology    sometimes good (even addresses) / always good
> rockwell                 always bad (even addresses)  / always good (odd
> addresses)
> WDC                      not working both cases
> bulgarian clone    not working both cases
> 
> any idea ? I dont really know what to think...

that makes no sense at all... it really shouldn't make a difference.

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