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From: martyl@rocksvax.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: 8 bit ram on PC ATs?
Message-ID: <868@rocksvax.UUCP>
Date: Sat, 14-Mar-87 13:56:29 EST
Article-I.D.: rocksvax.868
Posted: Sat Mar 14 13:56:29 1987
Date-Received: Sun, 15-Mar-87 04:54:27 EST
Organization: Xerox: Henrietta, NY
Lines: 30

I just received a  leased PC AT.

A few questions about PC AT's in general:
	1) How can I tell the difference between 6 meg and 8meg PC AT's without opening them up and looking inside or running some type of benchmark on them?
I use a Model 339 at work (8 Meg one), but where in the world do they 
distinguish the model?  Outward appearances of 6 meg and 8meg models don't seem
to provide a clue.  They just seem to say "PC AT".

	2) The leased unit I received has 256k of RAM on the motherboard, and an 
additional 384k on an 8 bit expansion board to bring it up to 640K (I didn't
ask for this configuration, this is just the way it came).  Does it make 
sense to run 8 bit memory on a PC AT?   It seems to me doing PC bus operations
will make the CPU pay a dear penalty (i.e. I just got the unit yesterday and
it's powerup ram tests seem awfully slow.  I use both a 6 meg and 8 meg unit 
everyday, each with 512 k on the motherboard.  Doing tests on another 128k of
Ram appears at least twice as slow [this is just an impression]).  Would it
be worth repopulating the motherboard with another 256k of dram?

	3) The monitor I got is an IBM monochrome monitor.  It seems to have
unusually long persistence (on the order of 15 seconds).  When the screen 
scrolls, it is unreadable for 15 seconds or so until things settle down.  After-
wards the image appears normal.  Is there a simple adjustment on the monitor
to control persistence?  I really don't want have to give it back for service
which may take several weeks (for want of a monitor, the PC was lost).  If it
just involves tweaking a pot, I'd rather do it myself.

marty leisner
xerox corporation
leisner.henr@xerox.com	(preferred address)
martyl@rocksvax.uucp	(alternate)