Re: Hardware emulation of 6509 using 6502?

From: Jim Brain <*brain_at_jbrain.com*> Date: Thu, 28 Jun 2018 20:16:32 -0500 Message-ID: <acbc4f32-e30d-06f3-560f-313d36b0e72c@jbrain.com> · brain_at_jbrain.com

On 6/28/2018 8:14 AM, Jeff Laughton wrote:
>
>
> Hi, Jim. You'll find some details about timing *differences* in Table 
> 7-1 of WDC's 65c02 datasheet [1], which makes a comparison with the 
> NMOS 6502. On the 'C02 the $6C opcode (jmp indirect) takes one cycle 
> longer. ADC and SBC also apparently take one cycle longer if you're in 
> decimal mode.
I am using a Rockwell 65C02.  Any info on those?  I don't know that I 
have a 65c02s here yet.

Jim