oops, late 80s is 25yrs ago ... not 35yrs ... finger slip. in the 80s, it was recognized that the half-duplex channel paradigm (not just ibm mainframe) ... introduced a lot of end-to-end latency overhead chatter. there were several serial, asynchronous efforts launched in the late 80s ... all including latency masking by batching whole i/o program to the remote end ... this was facilitated by the increasing improvements in technology and associated cost that could be put at the remote end (or instance ... much more intelligent controllers & devices with lots of local storage)
FICON initially just mapped on top of underlying fibre channel ... ignoring all the i/o program batching ... finally FICON starts with zHPF and TCW. -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
