lord@leadsv.UUCP (Parker Lord) (02/27/90)
I was able to get my hands on a free C= 2Meg Expansion card with no RAM or
sockets installed. Someone had gotten the cards and removed all the RAM from
them. I spent last weekend installing socket and the RAM from my Startboard II.
Well, after I fixed the trace I damaged during the soldering process and plugged
it into my 2000, it caused a GURU on power up. The error was 8100009.xxxx which
I think is something like "freed memory for second time") ?????. I also heard
that the boards might have originally had some dip resistors on the back and
figured that they must have been to tie the RAM's data bus to +5V through a
pullup resistor of some kind. I installed some 1K pullups to the 2 74F245 chips
on the side that goes to the RAMs. This kept my 2000 from crashing, but the
extra RAM was still not recognized.
Does anyone have this card in use? Is there some special command I need
to send during the startup-sequence to recognize the extra RAM or should it
autoconfigure. Also, could you tell me if my assumption for the placement
of the pullup resistors is correct and how the four jumper pins on the bottom
left are used.
PS The place I got the card still has more if anyone is interested.
He told me that he would sell them for $25.
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