[Simh] [HECnet] TOPS-20 V4.1 DECnet

[Cory Smelosky]

On Fri, 2 May 2014, Paul_Koning at Dell.com wrote:


On May 1, 2014, at 9:36 PM, Cory Smelosky <b4 at gewt.net> wrote:

On Thu, 1 May 2014, Cory Smelosky wrote:

Looks like there's no DMC on the PDP-10, no DMC OR KDP on the MicroVAX, and no KDP on the VAX780.

However, the PDP-11 has the DUP.   Looks like I can use that as the go-between.


Wonderinf if this is an RSTS/E bug...or a simh bug.

Device XK0: does not interrupt - device disabled.

Probably a SIMH limitation.   It   s complaining about the KMC11.   RSTS supports those only for use with the RJ2780 emulator; it doesn   t use them with DECnet.

The message comes from the hardware scan code, where it looks around the bus looking for devices and makes them interrupt to learn what vector each uses.   For the KMC11, it does that by loading a short program into it.   That only works if the KMC emulation knows how to emulate a KMC well enough to run that program.   If it emulates a KMC only as a KMC/DUP pair that speaks DDCMP, this won   t work.


Ahhhh.

If you want a RSTS system to connect to your Phase III machine, you   ll want to use a DMC (or DMR/DMP/DMV, they are all roughly interchangeable).   In a sufficiently recent SIMH, the DMC emulation speaks real DDCMP so it should talk with a software DDCMP implementation, such as one that uses a DUP.   Or, since it doesn   t know sync from async, it will probably talk to a software DDCMP implementation that uses a terminal interface.


That I can do.   Once I figure out the TOPS-20 DECnet configuration. ;)

	paul



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Cory Smelosky
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