Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!usc!brutus.cs.uiuc.edu!caesar.cs.montana.edu!milton!uw-beaver!zephyr.ens.tek.com!tektronix!sequent!mntgfx!dclemans
From: dclemans@mentor.com (Dave Clemans @ APD x1292)
Newsgroups: comp.sys.atari.st
Subject: Re: Unexpandable megas
Message-ID: <1990Jan3.220110.409@mentor.com>
Date: 3 Jan 90 22:01:10 GMT
References: <1989Dec30.064240.9297@murdoch.acc.Virginia.EDU>
Organization: engr
Lines: 12

In the systems I've seen, the "unexpandable" Mega 2 board does not
look like a new PCB layout.  Instead it looks like the original
layout artwork with the second memory bank covered up so that that
area stayed all copper.

My theory is that they ended up with a run of memory controller
chips that would not reliably drive a 4mb system.  Rather than
throw those away, they decided it was cheaper to do a kludge
run of "unexpandable" Mega-2 boards, stuffing the "bad" memory
controller chips into them.

dgc