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Old 06 July 2005, 12:39   #18
lopos2000
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Here are all the jumper settings I've found in a A3000 Manual.

Appendix G
Jumper Settings

FUNCTION
J100 4 2-3 2-3 1-2 1-2 Quadrature Clock Phasing
J101 3 2-3 2-3 2-3 2-3 FPU Clock Source
J102 3 2-3 2-3 2-3 2-3 System Clock Source
J103 4 3-4 3-4 3-4 3-4 FPU CS/BERR
J104 3 1-2 1-2 1-2 1-2 CPU Clock Source
J151 3 2-3 2-3 1-2 1-2 ROM Timing
J152 3 2-3 2-3 1-2 1-2 ROM Timing
J180 3 2-3 2-3 2-3 2-3 A2000 ROM Compatibility Jumpers
J181 3 2-3 2-3 2-3 2-3 A2000 ROM Compatibility Jumpers
J200 3 1-2 2-3 1-2 2-3 NTSC/PAL Select
J350 3 1-2 1-2 1-2 1-2 Tick Clock Source
J351 3 2-3 2-3 2-3 2-3 Disable DF1: (1-2 to enable )
J352 3 2-3 2-3 2-3 2-3 Light Pen Source
J481 3 2-3 2-3 2-3 2-3 VDE Scan Double Only Jumper
J482 3 1-2 1-2 1-2 1-2 VDE PLL Loop Adjust
J483 3 - - - - VDE Factory Test Points
J800 3 1-2 1-2 1-2 1-2 WD33C93 Speed
J851 3 1-2 1-2 2-3 2-3 RAM Controller Speed Jumper
J852 5 4-5 4-5 4-5 4-5 -012A Ramsey only (See Notes)
J853 3 2-3 2-3 2-3 2-3 -012A Ramsey only (See Notes)

Notes:
J150,J151: ROM Timing.
The ROM timing circuit provides four different speed settings to match the output enable and access timing of the system ROMs.
To set the jumpers, determine the output enable time and access times for the ROMs you wish to use . The ROM must have lower values than for the setting you select.
System standard ROMs have Toe = 110 ns, and Teo, = 250 ns.

CLK J151 J150 Toe (min) Taco (min)
16 MHz 2-3 2-3 157 ns 250 ns
16 MHz 2-3 1-2 220 ns 312 ns
16 MHz 1-2 2-3 282 ns 375 ns
16 MHz 1-2 1-2 345 ns 437 ns
25 MHz 2-3 2-3 90 ns 160 ns
25 MHz 2-3 1-2 130 ns 200 ns
25 MHz 1-2 2-3 170 ns 240 ns
25 MHz 1-2 1-2 210 ns 280 ns
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