DecServer 550 chassis

Paul Koning paulkoning at
Mon Oct 19 09:32:04 CDT 2015

> On Oct 19, 2015, at 3:42 AM, Pontus Pihlgren <pontus at Update.UU.SE> wrote:
> Interesting. I thought Tthe DECserver 550 was merely the big brother in 
> the terminal server line. But it looks like it is essentially a 
> PDP-11/53 with 1.5MW of ram, you need new boot roms though. Pretty nice.

It's been a while, but I think it may be a member of the "pluto" family.  The original plan for terminal servers was that they would run CTERM.  But the initial Pluto terminal server was incredibly slow, not surprising given how complex that protocol is.  So an AD project was started which created LAT, originally also in a PDP-11 processor (perhaps even the same one, I forgot).  And that turned out to be so superior in practice that it ended up being the main product instead of the original plan.  But we still have CTERM as a leftover from all this.


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