MB mem upgrade & VIDO off switch

[Darren Friedlein]

While looking for a solution to my motherboard question, I ran accross
This old article...
+-------
Subject: Re: upgrading mother board memory.
Date: 5 Dec 87 04:41:33 GMT
Sender: news at rtech.UUCP
Organization: Relational Technology, Inc. Alameda, CA

A 7300 mother board can supposedly be changed to 2M as follows.  I
haven't tried it and don't know if this is totally correct, but it is
very similar to the 512k card upgrade.  Anyone who actually does this
should post to these groups with a report.  I do not recommend this
to someone as a first experience with a soldering iron.

1.  Change all the 64k dram chips

2.  Change JR1 to be from E1 to E2.  You must break the board trace
    on the back from E2 to E3.
    
3.  Add a 74F258 chip to location 12B.

Here is a crude picture:

+------------------------------------------------
|	A		B		C
|	+-------+
|13	|	|
|	+-------+
|    cut E2-E3 trace 
|12    /E3		+-------+
|      \E2 \		|74F258	| add this chip
|	E1 / add jumper	+-------+
|
|		slide switch
|		thataway		toroidal coil--\
|		    |			thataway	\
|		    V					 V

Have fun!

-dB
"I don't care what you say, as long as you spell my name right."
{amdahl, cbosgd, mtxinu, ptsfa, sun}!rtech!daveb daveb at rtech.uucp
+------

And for blanking the screen, this article might make a good starting
point...
+------
From: ken at maxepr.UUCP (Ken Brassler)
Subject: Re: cursor & video monitor help
Date: 13 Nov 87 18:00:56 GMT
Organization: Brassler Engineering Co., Mill Valley, CA
Lines: 21

In article <3632 at islenet.UUCP> richard at islenet.UUCP (Richard Foulk) writes:
>
>I'd really like to get a larger monitor ...
>please post the pinouts for the...
>8-pin connector...
>in the computer.

My diagrams show a 10-pin connector in the computer. If you can
resolve this difference, these are the pinouts.

Pin(s)		Function

 1		video vertical synch
 2,4,6,8,10	ground
 3		video horizontal synch
 5		video out
 7,9		+12v
-- 

Ken Brassler {ihnp4|qantel|pyramid|lll-crg}!ptsfa!maxepr!ken
			   ....ethos!gladys!ptsfa!maxepr!ken




+------

NOTE:  It could be possible that 9 and 10 were left off because of a lack of
need for second +v and comm, but that's just an idea.

Let me know if anyone gets anywhere with either of these projects.

-darren
         ____
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  _____|_____     Darren G. Friedlein      data (bacchus) : 919/596-7746
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