microcoding a PC into a PDP-11 (was: RE: Classic Computers vs. Classic Computing)

From: Bill Pechter <pechter_at_bg-tc-ppp892.monmouth.com>
Date: Tue Sep 18 13:46:14 2001

> >Very good point. I was thinking that it would be nice to have a machine that
> >was a PDP-11 as soon as you flipped on the power, but probably not worth the
> >cost and hassle of the flash. Didn't some of the VAXen boot their microcode
> >from a floppy?
> Yes, the VAX 11/780 does.
> --Chuck

Actually much of the 11/780 microcode is in rom.
The stuff loaded from RX01 is mostly bug fixes to the rom code.
The patches went into the Writeable Control Store board.

The 11/785 went to completely RAM loaded microcode.
The 11/780 did have an optional second User Writeable Control Store

  d|i|g|i|t|a|l had it THEN.  Don't you wish you could still buy it now!
Received on Tue Sep 18 2001 - 13:46:14 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:34:25 BST