FNRJH@ALASKA.BITNET (01/23/88)
From: Robert Jesse Hale III
Dave I put the FBE mod in my old H100 and it worked.
The only problem I ever had with the upgrade was for a while I would
get a random buss error. I traced the error to the grid that jumps
pin 1 on all of the memory chip sockets. What was happening to my
machine was the chip would heat up and move ever to small of a length
and blam, it would cause a buss parity error. My solution was to go
back in and move the pin 1 on the memory chip so that it sanwiched the
jumper in the socket.
---------- --------
| jumper | | | ... ect
| pin 1 | | pin 2 |
---------- ---------
^
|____part of the chip socket. pin 1 presses aginst jumper to
maintain a firm hold.
Since that mod I have never had any problems. No dowm time. I have a
feeling it was just one loose conection. Put my mod in last september.
Good luck. RobertGUBBINS@RADC-TOPS20.ARPA (Gern) (01/25/88)
If you are a technoklutz and can't handle a soldering iron, I would recommend the FBE upgrade. Their support of their products is excellent. However, I recommend using the soldering method because the connectors are subject to poor connections (as mentioned) and that the baby board has been known to interfer space wise with other things (Gemni or UCI PC emulators - Not that ANYONE would actually want to pay money and use those...). Rob Logan (Thanx Rob) has posted the Clarkson Recommended way to upgrade the RAM. I recommend a slightly cleaner way (you Clarkson ECEs that came up with it didn't look at the whole situation completely) Do NOT use the mentioned resistor (which is left dangling from a bent IC pin), as there is one already provided on the motherboard for this use and is strategically located. We covered all of this a year or so back. I will be covering it all again in the ZUPGRADE series soon. I found a LOT of info on the mystery working of the power supply, including Theory of Operation... If only I had a lot of spare time to crank out the series faster... Cheers, Gern -------