From mboxrd@z Thu Jan  1 00:00:00 1970
From: michael_davidson@pacbell.net (Michael Davidson)
Date: Sun, 24 Apr 2005 17:12:36 -0700
Subject: [pups] Seeking info on SBC11/21+ Falcon Plus
In-Reply-To: <20050424.225511.125377820.cfmd@bredband.net>
References: <20050424.225511.125377820.cfmd@bredband.net>
Message-ID: <426C35F4.6050905@pacbell.net>

Magnus Danielson wrote:

>Dear all,
>
>I'm sitting here with a M7676 SBC11/21+ Falcon Plus card. It came with a
>BA11-VA chassi and a custom A/D card (controlled over the parallel bus).
>
>I have been scanning the Internet a number of times, but have had no luck in
>finding much material related. It has the T11 (DC310) chip, a pair of DC 319
>serial chips and some unknown chip called DC331 "FALCON". I've found a few
>related hints about it in the Micronotes (about the 82S100 PLA chip among
>other things). I've also done some reverse-engineering, so part of the
>schematic is know to me. But, since I have no plans of reverse-engineering the
>DC331 chip getting the hands on some hard documents would be much apprechiated
>
While it isn't identical, you might find the user guide for the original 
M8063 Falcon SBC 11/21
to be at least somewhat useful. It can be found at:

http://www.bitsavers.org/pdf/dec/pdp11/1121/EK-KXT11-UG-PR1.pdf

As far as I can remember the Falcon and Falcon+ are functionally very 
similar with the Falcon+
supporting larger memory devices and having a more flexible set of 
options for the memory map.

Chapter 6 of the 1985 edition of the Microcomputer Products Handbook 
lists all of the configuration
options for the Falcon+ and also shows the DC331 at E20 as being a "gate 
array". I have a copy
of this manual and could send you a copy of the relevant pages if that 
would be helpful.

Michael Davidson