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Article #40004Re: Unexpandable megas
From: Dave Clemans APD x1292
Date: Wed, 03 Jan 1990 22:01
Date: Wed, 03 Jan 1990 22:01
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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
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Path: arc1-ca.pugleaf.net!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