In what way was early DEC not open? In the 1960s and 1970s, every DEC computer came with a full schematic. You could troubleshoot any signal on any board. Mo

In what way was early DEC not open? In the 1960s and 1970s, every DEC computer came with a full schematic. You could troubleshoot any signal on any board. Most of it was COTS components, and replacements were easily obtained. Also, by 1980 there was a thriving industry of 3rd party add-on boards. The operating systems were less open, but that had a lot to do with the cost of distributing megabytes of source code. It was possible and recommended to recompile RT-11, at least, from source to optimize for your hardware configuration.