Re: Assistance with Star Wars w/Clay's ESB Kit --- SW novram clobber?

  I did lots of fanagling with the NVRAM on my I,Robot when it had
trouble saving settings and indeed, Atari seemed to balance the /SAVE
line with the timing of the +5V NVRAM supply *just right* to make the
NVRAM save data right before power disappeared. Technically, if you
doubled the load, the power supply would drop in about half the time so
putting a big cap in parallel with C93 seems like the best bet... at
least to eliminate that possibility.

On 2/21/2011 8:42 PM, Clay Cowgill wrote:
>> I'm assuming this is the 2212 used for SW novram. Is that right?
> I'm 99% sure that's right. (Sorry, it's been a long time since I had to
> look at/think about that. ;-)
>
> The idea was that you could take your existing Star Wars settings and high
> scores and move them over to the daughterboard without losing anything.
>
> The only thing that comes to (my) mind at the moment is that maybe with two
> NOVRAMs sharing their connections (except for the chip select which is muxed
> by the game select switch) maybe the 'new' SW 2212 doesn't have enough time
> to store the SRAM copy of the memory to the NV portion of the chip before
> the EAROM power goes away.
>
> For grins, you might try something like putting a big electrolytic cap
> across the "+5EAROM" power and ground pins of the 2212's on the
> daughterboard. (Like a 470-1000uF or something-- you could also put it in
> parallel with C93 on the SW board-- careful with the polarity.)
>
> -Clay
>
> P.S. My apologies to anyone contacting me in the last few months if I
> missed replying to you. We *just* finished getting Ground Kontrol back to
> our permanent location after a huge three month remodel, so it'll be several
> weeks still before I get my head above water again. We were doing 120+ hour
> weeks there towards the end. ;-)
>
> ---------------------------------------------------------------------------
> ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
> ** Please direct other questions, comments, or problems to chris@westnet.com
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Mon Feb 21 23:35:20 2011