[pups] Spares, et. al for 11/44 system

Gregory R. Travis greg at ciswired.com
Wed Mar 7 22:59:46 AEST 2001


On Wed, 7 Mar 2001, Fred N. van Kempen wrote:

> Hi,
> 
> > p.s.  The Nat. Semi board is a bit strange.  It has an area of
> > 16x4 TI 64K-bit chips (i.e  64x64k/8 = .5MB) and another
> > area of 10x4 TI 64K-bit chips (i.e. .3MB).  No matter
> > what I do, I can't do the math to get this board to
> > fit into a 256/512/1MB size.  I ASSUME it's a .5MB
> > board, but what about the extra chips?
> 
> FastECC or parity, most likely... usually two or three bits per
> word... 256K x 18.

Thought about that too but the math doesn't work.  40+64 chips = 104
chips * 65536 bits per chip = 6815744 total bits.

6815744 doesn't divide cleanly by any of 9, 18, 19, 36, or 38

greg

Gregory Travis
Cornerstone Information Systems ATS
greg at ciswired.com
812 330 4361 ext. 18





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