[sdiy] Prophet 5 Rev3 RAM issues

[Gordonjcp]

On Sun, Sep 20, 2015 at 10:17:03PM +0100, John Henson wrote:
> I have two Rev3.0 Prophet 5's here right now with bad 6508's in the
> battery backed up RAM, the availability of these chips is low and
> the costs very high, I built a piggyback board to use a 6116LP chip
> but while it mostly worked, the memory timings must not have been
> quite right as random bits got changed, I tied CS to ground and OE/
> to the Chip enable from the original system, should I try this the
> other way around, and has anyone else out there had to do this?
> 

/OE is Output Enable, /CS is Chip Select.  If I recall correctly /CS needs to be high then go low just before /WE goes low.

Wasn't there a late version of the P5 that used 6116s?  Maybe you could look at how they're wired up in that.

-- 
Gordonjcp MM0YEQ