From: utzoo!decvax!duke!unc!mcnc!idis!pitt!hoffman
Newsgroups: net.micro
Title: Re: DEC Micro PDP-11 & 11/70
Article-I.D.: pitt.502
Posted: Fri Apr 22 23:47:32 1983
Received: Sun Apr 24 04:51:02 1983
References: whuxk.181

The Micro/J-11 *IS* a CMOS processor.  The PDP11 Systems and Options
summary for January-March 1983 (received by me on April 20. harumph.)
indicates that the T-11 is of NMOS construction and the J-11 is of
CMOS construction.  The rated performance puts the J-11 at 3 to 5 times
faster than the T-11.

The semiconductor manufacturers' CMOS fabrication techniques have
improved tremendously over the last few years...CMOS no longer means
necessarily slow.  Check out the Hitachi HM6147-3 4k x 1 CMOS static
ram chips: access time is 55 ns.  The old 5101 256 x 4 chips were
usually around 450 ns though newer chips are faster.

While scanning the components section of the DEC PDP11 summary, I
found a chip they call the DLART.  It's a UART that will interface
directly with the T-11 chip and is software compatible with the
DL11.  This should make single board implementations easy.

I didn't get a price list with it, but $400-500 sounds about right
for the J-11.  Our local DEC office is handing out samples if you
can prove that you're going to buy large quantities for an upcoming
project.  We can't.  Sigh.

	Not afraid to claim that the PDP-11 is far from dead,
	Bob Hoffman, Pitt CS
	{mcnc,decvax,floyd}!idis!pitt!hoffman
	hoffman.pitt@UDel-Relay