On Wed, 22 Nov 2006 18:16:38 -0500, you wrote:

>Here's an off-the-wall idea, take it with a grain of salt :-)
>
>Considering advancments is speed and proccessing capabilities since these chips were designed in, couldn't a person produce a suitable emulator on a DSPIC or an ARM and put it on a simmilar carrier board? 

Might be worth looking at an FPGA - maybe one of the slightly older generation that run on 5V.
I think there are may be some 6502 VHDL models around (try opencores.org or
http://www.6502.org/homebuilt/) that could be adapted.
 

>If that were so, would such a product require the UL re-listing (and it's assosciated costs)?
>
>-Denny
>
>> 
>> I just finished re-designing a product for a client that's been in
>> production since 1985. It originally used a Rockwell R6501Q MPU. See
>> where this is heading?
>> 
>> The client builds about 1500 of these units a year and for the past
>> several years has been building them with a R6501J mounted on a
>> carrier board to fit the old R6501Q quad inline holes. This assembly
>> is a life-safety type device and changing the PCB layout would
>> require a complete U.L. re-listing to the tune of about $80K. So we
>> needed something that would "drop-in" and not require any software or
>> PCB re-work. We were lucky to find the R6501J's and be able to adapt
>> them to the old PCB design.

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