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
link:
http://home.t-online.de/home/r.benda/-A3000t-j.txt
