9 Jun
2004
9 Jun
'04
11:31 a.m.
So are these 256K per bank, or 256K per chip? IOW,
if they turn out
to be compatible and I install 16 of them on the Amiga A2091, will that
be a 2MB or 0.25MB upgrade?
Most DRAM chips are 1 bit wide. A 256K DRAM stores 256K _bits_ (not bytes
or words), arranged as 262144 locations of 1 bit each. 8 such chips store
256K btes, 256K locations of 8 bits each (bit 0 is stored in the
locations of one of the chips, bit 1 in another chip, and so on). 9 chips
were used to store a byte + a parity bit (very common on PCs)
16 of them, used conventionally (which I assume the A2091 does) would
store 512K bytes or 256K 16-bit words. It would be a 0.5M upgrade I guess
-tony