FPGA VAX update, now DIY TTL computers - test-drb@ccmp.vtda.org

4 Nov 2005

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Subject: Re: FPGA VAX update, now DIY TTL computers
   From: woodelf <bfranchuk at jetnet.ab.ca>
   Date: Fri, 04 Nov 2005 10:19:25 -0700
     To: General Discussion: On-Topic and Off-Topic Posts <cctalk at
classiccmp.org>

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. 
I think VMS and a few of the real OSs do but PCs nah.

Allison