Service manual

Eagle 250 Service Manual Page 11
Rev. 01
The AM-966-10 board uses the following connections and jumpers:
Location Description Wire Order*
J1 26-pin cable to AM-138. Notice pin 1
orientation on Figure 7.
JP1 Connects to Turbo switch. Black-yellow-white
JP2 Connects to Reset switch. Green-black or black-green
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. Red-black
JP5 Connects to system activity (Turbo) light.
Place connector on left two pins (white goes
on center pin).
Yellow-white
JP6 Connects to disk activity (H.D.D.) light.
Place connector on left two pins (white goes
on center pin).
Red-white
Table 3: AM-966-10 Connectors
* 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 Wires Purpose/Notes
Run Yellow/White Run light; white wire goes toward edge of
board.*
Disk Red/White Disk activity light; white wire toward edge.*
Power Green/White Power light; white wire toward edge*
Reset Green/Black Reset switch
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.