Re: strange read with a 6502...

From: silverdr_at_wfmh.org.pl Date: Wed, 30 Mar 2016 11:40:51 +0200 Message-ID: <14C0C6FA-7678-4D50-A2C7-0A9213A3707A@wfmh.org.pl>

They should all work the same. If they don't, I would look for the hardware application they are working in. Power supply, power / bus noise, grounding problems, etc. Grounding problems alone can cause unpredictable behaviour across different implementations. 
-- 
Sent from mobile device. Please have understanding.

On 30 March 2016 10:06:21 CEST, 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...
>
>
>
>
>
>
>       Message was sent through the cbm-hackers mailing list


       Message was sent through the cbm-hackers mailing list