A3000T SERVICE MANUAL JUMPER SETTINGS


			313181		313181

JUMPER	PINS	-O1, -03, -OS	-02, -04, -06	DESCRIPTION

J 100	4		1-2		1-2	CLK9O Delay
J 102	3		2-3		2-3	System clock source
J 103	4		3-4		3-4	FPU enable & chip select source
J 104	3		1-2		1-2	CPU clock source
J 105	3		2-3		2-3	Enable/Disable clock driver
                                                (except CLK3O)
J 106	3		2-3		2-3	Short CLK9O signals together
J 107	3		2-3		2-3	Enable/Disable clock driver to
                                                CPU (CLK3O)
J 151	3		1-2		1-2	ROM timing (see table below)
J 152	3		1-2		1-2	ROM timing
J 200	3		1-2		2-3	NTSC/PAL
J 350	3		1-2		1-2	Tick clock source
J 351	3		2-3		2-3	Floppy drive 1 enable/disable
J 352	3		2-3		2-3	Light pen source
J 482	3		1-2		1-2	VE PPL loop adjust
J 483	3		-		-	Factory test points
J 851	3		2-3		2-3	RAM controller speed
J 852	3		1-2		1-2	RAM chip size


The Rom timing circuitry in GARY provides for 4 different speed settings to match
the output enable and access times of the ROMs being used.

313181 -O1 thru -06 are all 25 Mhz systems

J151	J152	Toe(min)	Tacc(min)

2-3	2-3	90 ns	160 ns
2-3	1-2	130	200
1-2	2-3	170	240
1-2	1-2	210	280
.