[HECnet] Multinet alternatives ...

[Johnny Billquist]

Hum. I seem to remeber that the max number of RH20 was eight. However two were lost if you had a NIA-20 and two were lost if you had a CI.

But I might be misremembering.

  Johnny


Robert Armstrong <bob at jfcl.com> skrev: (27 februari 2020 00:10:22 CET)
>>You would likely have never seen a DTE on a KS processor …
>
>The DTEs plugged into dedicated slots on the KL.  There's no way you
>could have ever seen one on another model CPU - it's physically not
>possible.  The KL could hold up to four DTEs, and the first one was
>"special" in that it could poke around in the KLs microstore and
>internal datapaths.  The 11/40 CFE was connected to that one and that's
>how the KL was started up.  All the microcode was stored in RAM and
>immediately after a power on the KL was little more than a big heater. 
>The other three DTEs were more general purpose and were used for
>communications interfaces.
>
>There was, however, a DL10 for the KI that interfaced up to four
>PDP-11s to the I/O and memory busses.  Conceptually the DL10 was
>similar to the DTE, although I don't know how close they were
>programmatically.  Of course there was no equivalent to the CFE on the
>KI and all four -11 ports on the DL10 were identical.  And where as
>every KL had at least one DTE for the CFE, the DL10 was strictly
>optional.
>
>It's a similar story for the RH20s - they were dedicated options for
>the KL only.  A KL could have a maximum of 4 RH20s and every one needed
>at least two - one for disk and one for tape.  Although I believe on
>TOPS10 you could mix disk and tape on the same MASSBUS - maybe, I'm not
>sure about that.
>
>And likewise there was an RH10 MASSBUS controller for the KI which was
>similar to, but not the same as, the RH20.
>
>Bob

-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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