15 Dec
2017
15 Dec
'17
11:22 a.m.
On Fri, Dec 15, 2017 at 1:49 PM, systems_glitch
<systems.glitch at 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