Cheetah Cub board

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Wed Jun 9 23:28:25 2004

> Back to the DRAM nomenclature, the 1 bit vs 1 byte explanation helps
> a lot. I'm still confused about the multiplier.
>
> The Amiga docs show 16 256Kx4 DRAMs for a total of 2MB, so does that
> mean that these chips are 256Kx1?

256*4 DRAMs are what the numbers imply. 256K (262144) locations of 4 bits
(1 nybble) each. So 2 of _those_ chips store 256K bytes, 16 of them store
8*256K bytes == 2 Mbytes

The 256K *1 and 256K *4 chips have totally different pinouts (in fact I
think the former is a 16 pin chip, the latter a 20 pin chip), you
certainly can't interchange them.

-tony
Received on Wed Jun 09 2004 - 23:28:25 BST