saj@chinet.chi.il.us (Stephen Jacobs) (06/13/91)
What with GNU Emacs, big RAMdisks, Scheme, Smalltalk, MultiGEM, etc. etc. it
seems like a reasonable thing to want to expand a Mega beyond 4 MB. Anyone
done it? Any possibility of a commercial expansion?
Steve saj@chinet.chi.il.usytsuji@wucc.waseda.ac.jp (Y.Tsuji) (06/13/91)
In article <1991Jun12.183028.20305@chinet.chi.il.us>, saj@chinet.chi.il.us (Stephen Jacobs) writes: > What with GNU Emacs, big RAMdisks, Scheme, Smalltalk, MultiGEM, etc. etc. it > seems like a reasonable thing to want to expand a Mega beyond 4 MB. Anyone > done it? Any possibility of a commercial expansion? > > Steve saj@chinet.chi.il.us I have done some preliminary probe into this matter two years ago and there was absolutely no problem at all. Expanding up to 8 MB is rather easy if you know how to build a RAM board for 68000 CPU. The reason I haven't done it yet is that so far I couldn't persuade the DMA controller to handle the upper 4 megabytes. I have recently heard that CRT controller (SHIFTER) can be persuaded by poking their I/O addresses (Reflex board does this and allows us to use any kind of monitor on TOS 1.4). I don't think using a RAM disk of 4 MB is very fantastic (I'd rather use a hard disk). Another thing I had to consider was using Standard SIMMS sockets... Germans actually sell expansion boards, but they are VERY expensive at least in England where I am based in a way. A 4 MB expansion module costs Sterlng Pounds 689.43 at Atari Workshop in Windsor. It may not include the actual chips which they charge StgL 275 for 4 MB. Tsuji
csbrod@immd4.informatik.uni-erlangen.de (Claus Brod) (06/13/91)
saj@chinet.chi.il.us (Stephen Jacobs) writes: >What with GNU Emacs, big RAMdisks, Scheme, Smalltalk, MultiGEM, etc. etc. it >seems like a reasonable thing to want to expand a Mega beyond 4 MB. Anyone >done it? Any possibility of a commercial expansion? There is a commercial solution distributed by Richter Computer in Germany. With their expansion cards, you can pump up memory volume to 12 MB. ---------------------------------------------------------------------- Claus Brod, Am Felsenkeller 2, Things. Take. Time. D-8772 Marktheidenfeld, Germany (Piet Hein) csbrod@medusa.informatik.uni-erlangen.de Claus_Brod@wue.maus.de ----------------------------------------------------------------------
ant@mks.com (Anthony Howe) (06/13/91)
Gadgets by Small has a 68030/8Mb expansion board which will combine your on-board memory with the above to give a Mega 4 a whole 12Mb of RAM!!!!! I saw Mr.Small at CeBIT this year and he showed me this marvelous expansion board for Megas. There are a lot more details about this board and I recommend contacting him for more information. -- ant@mks.com Anthony C Howe Mortice Kern Systems Inc. 35 King St. N., Waterloo, Ontario, Canada, N2J 6W9 "Fate favors fools, small children, and ships named Enterprise" - Riker
adamd@rhi.hi.is (Adam David) (06/15/91)
In <1991Jun13.120105.18786@informatik.uni-erlangen.de> csbrod@immd4.informatik.uni-erlangen.de (Claus Brod) writes: >There is a commercial solution distributed by Richter Computer in >Germany. With their expansion cards, you can pump up memory volume to >12 MB. Does anyone know how well this handles DMA and video? I'm not prepared to buy one just to find out. How many other commercial / DIY homebrew memory expansion systems are there? Gadgets seem to have a clear value-for-money winner. Keep it up Dave & friends! -- Adam David. (adamd@rhi.hi.is)