On Aug 6, 2017 12:44 PM, "Sam O'nella via cctalk" <cctalk@classiccmp.org> wrote:
Theyre always out of my reach but is there a way to upgrade or convert 5100/5110s to IPL or basic or are you stuck with what you get? I assume you meant APL. In general you're stuck with what you get. In principle if you found all of the necessary ROS (ROM) cards and wired a switch or jumper to the backplane, you could convert a 5100/5110/5120 to the other language or to dual-marked. I need to design a 5100 language ROS card replacement, as one of the APL language ROS chips in my 5100 model C has gone bad. It fails self-test. There is also "executable ROS" associated with each language. The system can't self-test that. Naturally IBM made their own ROM chips which are neither pin nor electrically compatible with industry standards. The backplane signals are TTL compatible, though.
