What is the use of an ATR card in an HP9000/7xx?

Actually, the ATR card used in Snakes is *exactly* (I know, I spec'd it) the same one used in the old DPCI-Ring product. That means it's the same board as used in the DN4XXX-series, but with the Aegis boot PROM removed and a node ID inserted in the socket that was always there (way back in the REAL old days, you couldn't even boot an Apollo node without a network card in it because then it wouldn't have a node ID to generate UIDs from, but somewhere along the line we got smart and started putting them on the system board, but that's another story...). As to IP encapsulation on ATR, Pete is right, the entire basic DDS header, all *70* bytes of it, is there.

It has to be or I'd have broken real Domain nodes. Right after the DDS header is a little 12 byte header called the DR header that Domain TCP uses for its own purposes. After that comes a conventional IP packet.

I *didn't* port DDS to HP-UX in order to get ATR support into it. That would have been an extremely time-consuming effort ... more.

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