Setting up the Burr-Brown parallel I/O card as a debug master.
Bob Powell - 9/23/85

In short:
	1. Set the mapping and address select jumpers.
	2. Jumpering P1LO, P1HI, P2LO and P2HI to be bidirectional ports.
	3. Making P3LO a bufferred output by inserting a 74S00.
	4. For a long debug cable, replacing IC24 and IC26 with 74F374's.
	5. Mating the board with a Multibus carrier-card.
	6. Connecting the Nu-Debug cable to P3.

Lambda-diag knows about up to two Burr-Brown boards.  The first is the
"primary" board; the second is the "secondary".

1. Set the jumpers:
	Select multibus address 0x2ff00 for the first ("primary") board:
		A13 - row 0
		A12 - row 0
		A11 - row 1
		A10 - row 0
		AF through A8 - row 1
		A7 through A4 - row 0
	For the second ("secondary") board in a rack (0x2fe00),
		set A8 to 0 instead of 1.
	Select 20-bit addressing:
		Insert jumpers at 20-BIT, 16-BIT and 12-BIT.
	Select memory-space address:
		Jumper M-R at I-M-R; M-W at I-M-W.
		Jumpers at INH1 and INH2.
	Remove jumpers at ID0, ID1, ID2.
	Note: there aren't enough jumpers; get some more or use wire-wrap.

2. Jumper P1LO, P1HI, P2LO and P2HI to be bidirectional ports:
	These sockets are wired for generic quad two-input gates, e.g. 7400.
	To make bidirectional ports, connect the "inputs" and "outputs".
	For each of the four sockets, jumper 2-3, 5-6, 12-11 and 9-8.
	Pin 1 is closest to the edge of the board.  You can short the
	pins together on the back of the board, or insert 14-pin dip headers
	and short the pins on those.

3. Make P3LO a bufferred output:
	Insert a 74S00 or 74F00 at P3LO; pin 1 closest to the I/O connector.
	This drives the Nu-Debug control lines.

4. Long debug cable:
	If the debug cable is longer than about eight feet, the 74LS374's
	that drive the Nu-Debug data lines D0..D15 are not powerful enough.
	IC24 and IC26 should be replaced with 74F374's.  The best way
	is to replace the chips with sockets and plug in the chips.
	The 74F374's can drive at least 100 feet of ribbon cable.

5. Carrier-card:
	The Burr-Brown board plugs into any carrier card.  None
	of the carrier cards have compatible I/O connectors, so the
	debug cable connects directly to the board.

6. Nu-Debug cable:
	The 50-pin cable connects to P3.  *** NOTE: Pin 1 (stripe) of
	the cable should connect to pin 50 of P3.