[sdiy] EPROM replacement?

[Cary Roberts]

As I was purchasing two 2716 EPROMs for my Prophet 5 rev2 today it
struck me as really lame to copy data from two 30 year 2708s into two 25
year old 2716s.  That can't be any better.  I've already lost a EPROM in
my OBXa and it's one of the later manufacture polysynths I own.

Has anyone looked at making a new EEPROM or FLASH based replacement for
old 2708/16/32/64 EPROMs?  I was thinking something along the lines of a
carrier board for a TSOP Atmel AT28C256 or AT29C256.  With a few solder
pads it could be easily reconfigured after programming to any one of the
2708/16/32/64/128/256 parts.  I'm also wondering how much longer 5V
EEPROM or FLASH parts will be available from Atmel, etc.  With 3.3 and
now 1.8v parts becoming the norm it can't be long.  Cramming three octal
level shifters and a 3.3v reference on a DIP28 package might be kind of
tight.

-Cary