On Fri, Dec 15, 2017 at 1:49 PM, systems_glitch <systems.gli...@gmail.com> wrote: > It's on my list of things to do -- you can run external clock into DL11 and > DLV11-J style connectors, and IM6402 UARTs are supposed to go up to 2 mbit, > so somewhere between 38400 and 2 mbit should be possible.
Good to know the IM6402s will go that fast. > I believe it'll > require external RS-232 transceivers due to the design of the ones used on > various DEC boards. Yeah... that's kinda why I was thinking of hacking a DLV11J or DL11-W... I have a number of each of those and have no problems making multiple changes for the purposes of media slurping. They are common boards and hacking 1-2 of them isn't going to increase scarcity. A side-effect of modding the DLV11J could be high-speed TU58 emulation... > Figure if I can get any real improvement out of it, I'll lay > out a board and provide high-speed kits. I'm available for any experimentation, etc. I have plenty of mid-range PDP-11 hardware for this sort of experimentation. > Anyone know of a 40-pin UART with a FIFO? :) I do not, but it would have to be a transparent FIFO - that was one of the problems with the 8250/16550 was the host code had to know about the FIFO, so the 16550 worked fine as a 8250 but also supported the 16-byte FIFO that drastically cut interrupt overhead. I do not know of any material enhancements to the IM6402 in any subsequent chips. -ethan
