FF „                  ˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙˙Upgrade the XEGS into a 130XE. No claims. Your risk. It works.››Components:›2 ea 41464 Dynamic RAMs (18 pin DIP - 64K x 4)›1 ea C025953 XE Gate Array (B&C or Best)›2 ea 18 pin sockets to fit RAM chips›1 ea 33 ohm resistor (orange/orange/black/gold)›4 ea 3.3K ohm resistors (orange/orange/red/gold)›30 gauge insulated wire››Of course, working on electronic components requires static control. You will be required to solder and unsolder connections.››1. Disconnect everything. Unscrew the phillips screws from under the main box. The keyboard will not be modified. Keep the screws so you'll know where to find them to put the unit back together. Pull out the shielded case, and unbend the tabs to expose the PC board. Remove the board from the shielding.›2. With the board facing you with the keyboard connector on the left, locate the ICs labeled U2 and U3. They are probably labeled 41464, have 18 pins, and are the RAM chips. If you want a clean installation, desolder these chips and solder the sockets into the RAM chip positions. You don't have to...but if you do, note which way the notch faces so that they are installed properly.›3. Put a new 41464 RAM chip piggy-back on top of the old. Solder all pins together except number 16: bend it outward on the top chip only. Do the same to the other chip. If you put in sockets, put the chips back in the sockets.›4. Take the C025953 chip and bend all of the pins out straight except 8 and 16. Locate U13, a 74LS138 16 pin chip. Place the C025953 piggy back on top of this chip and solder pin 8 to 8 and 16 to 16.›5. Locate pins 12, 13, 14, and 15 on U14. Now turn over the circuit board and locate them again. Solder one end of a 3.3K ohm resistor to each of these pins. Then solder the other end of all the resistors to pin 20 of U14. Yes, it gets tight. Remember you have to get this thing back in the case, so plan properly. Insulate the leads from the circuit board with either shrink tube or electrical tape.›6. Turn the board back over to the component side. Using wire, connect the following:›Pin 1 of C025953 to pin 19 of U8›Pin 2 of C025953 to pin 20 of U8›Pin 3 of C025953 to pin 12 of U14›Pin 4 of C025953 to pin 13 of U14›Pin 5 of C025953 to pin 14 of U8›7. Locate R21 to the right of U2. Desolder the upper end of R21 (33 ohms) and bend it upwards. Connect pin 6 of C025953 to the solder spot on the PC board left from the pulled end of R21›8. Connect the following:›Pin 7 of C025953 to pin 8 of C025953›Pin 9 of C025953 to pin 9 of U8›9. Connect the bent up pins 16 of U2 and U3. Connect one end of the 33 ohm resistor to the bent up pin 16 of U2, and the other end (with additional wire) to pin 10 of C025953.›10. Connect pin 11 of C025953 to the free end of R21.›11. Desolder and pull up pins 23 and 24 of U6. Solder pin 12 of C025953 to pin 23 of U6. Solder pin 13 of C025953 to pin 24 of U6.›12. Connect pin 14 of C025953 to pin 15 of U14›13. Connect pin 15 of C025953 to pin 5 of U6›14. Reassemble everything after you recheck the connections. You now have a fully compatible 130XE in your XEGS. No parallel bus, but a detachable keyboard!››