Integral RAM upgrade

[Tony Duell]

> 
> On 28 Feb 2008 at 19:51, Tony Duell wrote:
> 
> > Anyway, the RAM board was clearly identical to the 1M board, just with 
> > only have the RAM chips fitted and the links set differently. Having got 
> > a lot of 41256 chips on old PC memory boards, I spent the afternoon 
> > upgrading it to 1M.
> 
> Sounds very similar to what was often done to the first-round 5150s 
> to get the planar memory increased from 64K to 256K.

Not really. In the case of the Integral, the 512K oartd has 16 RAM chips 
and 16 empty spaces. I had to add the extra RAMs, but not remove 
anything. 

I would have thought the 5150 upgrade involved removing the existing RAMs 
nad rpelacing them with larger-capacity chips, more like what I did to 
my HP9816.

-tony