IBM Bus & Tag channel protocol specs?

Sridhar Ayengar wrote: I am not at all familiar with the RTIC libraries, but what I have, I would not infer that the libraries can do what the P/390's LIC can do. I remember discussions with Marty Ziskind at the first show that they came to and they not only cooked the code for what they did with the I/O for channels, etc, but also ran their own specialized Token ring code libraries, to allow them to use unused token ring features for their CTCA emulated between P/370's ( later P/390 ) (no I'm not talking about the AT/370, but the first cards were not 390). So if those libraries have both ends of the hose available, all I'm saying is that it would be nice to know where that is, just to see what it does. On the Hercules group discussion, this was put down as not feasible for reasons I will have to sift thru a lot of postings there to find. The only hardware solution was the third party one used by Flex, I think. Again, this assumes that you want to write your own code and use the hardware like this. That turns out to be very different than what IBM can do with the same hardware and their software on the same pile a lot of times. Jim