quad.eco

Thursday, 6 March 1980  --- JLK					-*-TEXT-*-

This is an ECO to fix the timing jumpers on QUAD CHAOS Rev. 2.

Flush incorrect default jumper setting

Delete			Add

B11-4 : B04-13		B04-8 : B11-4
B04-13 : B04-8

Fix toplevel jumper wiring lossage

A11-9 : E08-14		A11-8 : E08-14
A11-8 : A11-9		A11-6 : C01-6
A11-6 : C01-6
A11-11 : A11-6

Fix toplevel jumper lossage

B03-3 : B03-6		B03-3 : B03-7
B03-7 : B03-8		B03-7 : B03-8
B03-6 : B03-7
B03-5 : B03-10

Fix interval timer bug

F14-13 : B16-15		B16-11 : B16-15

Then follow instructions in AI:CHAOS;QUAD SETUP

----------------------------------------------------------------
ECO#5  8/3/80 RG/JLK  Change cable speed to 4 MHz.

LMTCLK: Change jumper.

	Delete			Add

	B3-6 : B3-7		B3-6 : B3-5.	;This changes the speed of FCLK.

On some boards, the following wiring may be needed to accomplish this:

	Delete			Add

	B3-6 : B3-7		B3-3 : B3-7
	A3-8 : B3-3		A3-8 : B3-3
	B3-3 : B3-6		B3-5 : B3-6

LMDETC: Change timing jumpers. The deletions are only necessary on revision
	1 and 2 QC boards.

	Delete			Add

	all toplevel		B4-6 :  B4-13		;lengthen GENCLK
	wires on		B4-8 :  B4-11
	B4-6			B11-6 : B11-13
	B4-8			A11-6 : A11-13
	B11-6			A11-7 : A11-8
	A11-6
	A11-8

NOTE: Some boards require the following set of deletions and additions.

	Delete			Add

	B4-7 : C1-14		C1-14 : B4-6
	B4-6 : B4-7		B4-6 : B4-13

FCLK/2 fix to allow UNIBUS readout at 8 MHz while cable rate is 4 MHz.

	Delete			Add

	A6-7 : A16-4		A6-7 :  A16-4
	A6-7 : D8-6		A8-11 : D8-6
	A6-8 : D13-3		D13-3 : E3-12
	A6-8 : E3-12		A9-3 :  E3-12