>Can I still beg for an eeprom solution? or at least external
>battery sram? When it boots, the eeprom data is read into ram,
>and eeprom is then only accessed then during menu or high score
>saves. I know this is more complicated, but if the battery backed
>sram doesn't at least have an external battery, Ram changes so
>often, it'll be a pain in 10-15 years.
You can beg, but it won't do any good. ;-) Adding additional EEPROM burdens
the cost and size of the product. The ST/Dallas Zeropower SRAMs are
designed to do this kind of thing, hence why I'm using it.
If you're *really* worried about it, just buy a 1 or 2 spare MK48Z02 from
Jameco for ~$6 each. Tape them inside the cabinet with the PCB. The clock
doesn't start ticking on the 10+ year battery life until power is first
applied, so between that and whatever comes on the kit you're covered for a
good thirty years. By then we'll all be paying $47 each for antique 74LSxx
parts anyway (since everything else will be using 0.25 volt power supplies
and won't interface to TTL anymore :-).
-Clay
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
---------------------------------------------------------------------------
** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
** message body to vectorlist-request@synthcom.com. Please direct other
** questions, comments, or problems to neil@synthcom.com.
Received on Wed Apr 5 16:13:38 2000
This archive was generated by hypermail 2.1.8 : Thu Jul 31 2003 - 23:00:47 EDT