[HECnet] VMS/RSX Guest accounts

You know, I have been racking my brains from time to time and I can't remember a thing about the ADP modifications to the 2020. So, the 2020 came with a maximum of 512K words, 2**9.? An addition bit would have brought it up to a full megaword, 2**10, which is quite reasonable for the target audience (some kind of installation that didn't hold stock in the local power utility). I guess there may have been modifications to the 2020 build of the monitor to allow for the extra bit.? I don't know if the Unibus devices could do DMA into the full address space. Did you pick up any software with these little jewels?? The monitor changes might be interesting. > ------------------------------------------------------------------------ > On 4/24/20 12:12 AM, Dave McGuire wrote: > Nice! > > One of our 2020s is in the brown color scheme. You know what that > means: ADP, and one more address bit. >> ------------------------------------------------------------------------ >> On 4/23/20 6:15 PM, Thomas DeBellis wrote: >> >> The solution for 4.1 was one of the finest hacks I have ever heard of; >> while the 2020 doesn't support extended addressing, it does support >> multiple address spaces, so what they did was move all the symbols into >> a separate address space.? This was called 'hiding' symbols and I >> thought it was great because it made them harder to smash.? However, all >> of that went out the window with 5.0, which fully supported extended >> addressing.