FPGA VAX update, now DIY TTL computers

[woodelf]

Allison wrote:

>There is also the matter of fault tolerence.  Parity doen't provide that
>unless the OS can map out the offending bank and the offending bank
>isn't in a critical location.  ECC can keep you going if you have a 
>stuck bit but it's up to the user/maintence to fix asap.
>
>  
>
But does any software even consider being able to be rolled back from a 
check point nowdays?
With a well designed  virtual memory system ( no gui stuff  I guess ) a 
process that takes several
days? or more to process needs to interuptable and saveable.