• Balloon3BuildVariants

There have been several builds of the Balloon3 boards:

Prototypes P1 and P2

Build E1

Here we describe how to tell which you've got and the differences that might matter to you.

Memory

There are 8 chips in the schematic but only 6 fitted on boards so far.

Physically laid out like this: (power connector in top LH corner)

On P1 and P2 Because Bank 0 isn't fitted a bodge wire is added on the back to make Bank3 into Bank 0

P1 and P2 have 64Mbyte per bank - 16M x 16 bits (256Mbit) per chip - marked K4S561633F

E1 has 128 Mbyte per bank - 32M x 16 bits (512Mbit) per chip - marked K4M511633C

Memory map

The pxa has two memory layouts 'small' and 'large'. Large allows for more than 256 MB of RAM. They are laid out as follows: