Ok, now that you have opened your HP, let's start with the upgrade.
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Solder the new ram, 128K x 8bits static SMD. Take care at the orientation
of the ram: The first pin is down near the ROM chip, near
the battery case. There's a dot on the chip near one corner of the ram locating
the pin number 1. It already works!! Close the HP (see how to do it) replace the batteries and check if the HP turns ON... If it doesn't, then you are in troubles... Reopen your HP, check all your solders, check for soldering bridges, try to bend up the pins to check if they are good soldered,... If you have done it carefully, there should be no problems. At this point, you have 128K. You may want to stop now, there's no problem. If on the other hand you are brave enough, you can try to do the second part of the upgrade: adding 128k more for a total of 256k! |