This is what I know, thought I knew or remember:
 1. The front-end connected to the master DTE (I.E., **the** front-end)
    runs a version of RSX called RSX20F
 2. The DN60 software running to speak RJE/37xx/HASP to an IBM system is
    specially written and not RSX based.
 3. The DN20 software is or was called "MCB".  Somewhere there is an
    email as to what this means.  I don't know if it is RSX based.
I never heard of COPOS/11 and there is no mention of it in any of the 
emails that I have preserved from the 80's and 90's.  The Tops-10 NFT 
and related sources appear to have some special casing for it.  That's 
of interest because I don't believe the MCB could do DAP or had FAL.
I was wondering what ELAN meant?
    RSX
    Symbol 	RSX
    Value 	RSX
    OS Type 	Tops-20 DAP
    Symbol
    OS$ELN 	15 	ELAN 	.OSELN
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On 11/21/22 11:02 AM, Johnny Billquist wrote:
  On 2022-11-21 16:32, Robert Armstrong wrote:
   Thomas
DeBellis <tommytimesharing(a)gmail.com> wrote:
 COPOS/11 
    So what exactly is COPOS/11?  Did I miss that in the original 
 discussion?   I think it was said that COPOS/11 was the front end for 
 TOPS-20, but AFAIK the FE for both -10s and -20s is RSX-20F.  Was 
 COPOS some internal name for that, or is there another story here? 
 
 I don't think anyone actually knows. But someone found some mention of 
 it being some kind of FE for TOPS, but it't not *the* FE, as far as I 
 could understand.
   Johnny