Alpha Microsystems Eagle 250 Manual de servicio - Página 14
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The AM-966-10 board uses the following connections and jumpers:
Location
Description
J1
26-pin cable to AM-138. Notice pin 1
orientation on Figure 7.
JP1
Connects to Turbo switch.
JP2
Connects to Reset switch.
JP3
In an Eagle 250, this jumper must be on the
upper two pins (those closest to J1).
JP4
To speaker and front panel power.
JP5
Connects to system activity (Turbo) light.
Place connector on left two pins (white goes
on center pin).
JP6
Connects to disk activity (H.D.D.) light.
Place connector on left two pins (white goes
on center pin).
*
Wires should be in this order, from top to bottom or left to right, depending on jumper
orientation. In some cases, wires may be reversed; if connection doesn't work in this orientation,
try reversing the connector.
If all front panel lights stop working, check the JP4 connection first. If it is loose, none of the
lights will work.
Front Panel Display Wires for Upgrades
Computers which were upgraded to an Eagle 250 from older Eagle computers may not use the AM-966-
10. If not, the 20-pin connector from the front panel attaches at P10, and additional front panel wires
attach at P8 as indicated:
Board Label
Run
Disk
Power
Reset
UPGRADING EAGLE 250 ON-BOARD MEMORY
The AM-138 has two on-board SIMM (single inline memory module) expansion slots, which support
60ns DRAMs; you can install either one or two memory SIMMs. Because the memory is located on-
board, it can be accessed much faster than memory accessed over the VME bus—i.e., AM-730 and AM-
740 memory boards used with earlier CPU boards.
Rev. 01
Table 3: AM-966-10 Connectors
Wires
Purpose/Notes
Yellow/White
Run light; white wire goes toward edge of
board.*
Red/White
Disk activity light; white wire toward edge.*
Green/White
Power light; white wire toward edge*
Green/Black
Reset switch
Wire Order*
Black-yellow-white
Green-black or black-green
Red-black
Yellow-white
Red-white
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