If the timing was wrong, wouldn't it fail to save the score in that 2212 all the time? I thought he said that SW saved the scores now, but, when switching back from ESB, SW was re-initialized.
Maybe I'm misreading him again.. don't know.
Joel
On Feb 21, 2011, at 11:33 PM, Jess Askey wrote:
> 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. ;-)
>>
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Received on Mon Feb 21 23:40:44 2011
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