Access server and/or frame relay switch on a 2612?
The 2612 should be able to support both modules. Here's a link with the supported module list for the 2600 and other platforms:
http://www.cisco.com/en/US/products/hw/routers/ps214/products_tech_note0...
The NM8A/S should work with any code version according to the data here:
http://www.cisco.com/en/US/products/hw/routers/ps274/products_tech_note0...
The NM-16A will require certain code versions to work properly as well as octal cables, here's the data on those:
http://www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a0...
Only one module per 2600. Recommend following the hardware installation guide for the specific platform when adding these modules.
Sounds like a fun project. Best of luck building the lab!
Well it's settled then. I'd better start farming on ebay :p
Thanks a lot for confirming my thoughts.
Cheers.
Alex - CCNP - CCNA Security