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

On 2022-11-21 16:32, Robert Armstrong wrote:

Thomas DeBellis <tommytimesharing@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