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monahan_z
March 19th, 2010, 07:18 PM
In our continuing efforts to build new S-100 boards, we have now just completed the second prototype of our S-100 4Mg Static RAM S-100 board. The board is now as best I can tell complete and ready for a production run.

While this board will work with current 8 bit systems, it is really for 16 bit systems (8086, 80286 and 80386 etc.). The board has a capacity for 4MG of RAM (way past most people’s need) It has 50ns access time chips! You can read more about it here.

http://s100computers.com/My%20System%20Pages/RAM%20Board/4MG%20RAM%20Board.htm

Ole Juul
March 19th, 2010, 07:37 PM
Google wasn't much help here and I guess I'm ignorant, :) but what exactly is 4 MG? Did you mean MB?

MikeS
March 20th, 2010, 12:09 AM
Google wasn't much help here and I guess I'm ignorant, :) but what exactly is 4 MG? Did you mean MB?Well, he usually spells it Mg; that'd be a pretty heavy board (4 metric tons)... ;-)

Wonder if it'd work in my Cromemco 68000/68020 systems; it'd sure use less power than the set of 4x2MB boards in there now... not about to spend the big bucks to find out though...

monahan_z
March 20th, 2010, 12:16 AM
Mike the two SRAM chips are about $20 each. The board will be about $50 and say 20$ for TTL chips.

Chuck(G)
March 20th, 2010, 09:02 AM
There's a cheaper source for these. Futurlec has the Samsung KM684000 for about $9.

A nit on the article--the AS6C4008 is a 32-pin DIP, not 36.

monahan_z
March 20th, 2010, 11:05 AM
Thanks for noticing that Chuck, will update. I re-looked at Jameco catalogue they are now only $5.96 each. (#1927617)

MikeS
March 20th, 2010, 11:39 AM
Mike the two SRAM chips are about $20 each. The board will be about $50 and say 20$ for TTL chips.Certainly cheaper than what the 2MB Cromemco cards cost in their day, but even at $5.96 per RAM chip (free actually, since I already have some) still more than what I'm prepared to spend (which is $0.00 ;-) )
But it would have been interesting to see whether your card would work in their 68020 systems.