RX02 Bootstrap

Ben, let me continue to be picky, as I often learn new things by trying to really and thoroughly understand how something works. ;-) Will work for some, but not all, media. RL01/RL02, for example, can be done this way. I have seen a four-word bootstrap that indeed only consists of putting the required command into the CSR and then WAITing. Operating instructions: "let the program run for a few seconds, then HALT and restart at address zero." Will the IRQ really clear the halt F/F, causing the processor to resume running? - I need to get my machines running soon, memory is fading... Other disk types, such as the RXs, require loading of more than one sector, and not many controllers are like the RK11 in that they automatically increment sector counters. What I wanted to point out is that you need to have some kind of "handler" for the reset button if you want your PDP-11 to have a life after that. I might call this "handler" a "bootstrap" :-) - And I intended to have a PDP-11 processor execute the instructions, not a human! ;-) -- Andreas Freiherr Vishay Semiconductor GmbH, Heilbronn, Germany http://www.vishay.com