Subject: Re: High serial port (output) speeds
To: None <email@example.com>
From: der Mouse <mouse@Rodents.Montreal.QC.CA>
Date: 10/23/1999 21:32:56
> I remember Jonathan experimented once with running sone pmax
> workstations in 1x mode. It just didn't work reliably in his
> experience. I'm afraid the same'd happen here.
Do the pmax boxen also use 8530s? If so, which ones? Someone quoted a
Zilog data sheet...but I just now opened up an IPX, and it (at least
this particular one) uses AMD chips, not Zilog chips. They may be
bug-for-bug compatible, but they also may not; if I built a chip with
the interface of the 8530 but with more accurate mid-bit sampling and
synchronization (see an upcoming message for how this could be done), I
wouldn't hesitate to call it an 8530. For all I know, not having seen
the spec sheets, AMD did.
> Or actually what I'm more concerned about is that folks who didn't
> understand what's wrong with 1x mode would try to use it, and then
> get mad at NetBSD when it didn't work. :-)
Or rather, mostly worked but produced garbled bursts now and then.
This is certainly a reasonable concern; if anything like that patch
goes into the tree perhaps it should be in a fashion that requires
explicit turning on before it can be used at all. (Kernel build
7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B