Max Memory Mod parts list 	R. Grieb	9/11/2013

Ref Des		Description				Digi-Key Part #

U115		27C256 32Kx8 CMOS EPROM		 	---			$2.60 (ebay)

U112		DS1230Y-150+ Battery-backed 32Kx8	DS1230Y-150+		$14.33
		SRAM, 150 nSec access time
		
D1,D2		Schottky diode, BAT48			497-2512-1		$0.70 for two
		used for its low forward voltage

R1		1/4W 5% 1K Ohm resistor			1.0KQ			$0.05

C1,C2		0.1 uF Ceramic capacitor		BC1148CT		$0.24 for two

-		28-pin IC socket for EPROM		A24804			$0.84
		stamped contacts
		
-		28-pin IC socket for NVRAM		ED3029			$1.38
		machined-pin contacts
		
-		14-pin gold PCB header			SAM1111-14		$7.71 for two
		two required

- 		Custom PC Board (Express PCB)		---			$10.40

-		Tie wrap to secure bd to socket		---			$0.05
		on Max main bd
----------------------------------------------------------------------------------------------
		Total parts cost						$38.30
		
		
Note:  It is possible to perform the modification without using the plug-in memory board.
This would reduce the parts cost to about $20.  To accomplish this, you would need to remove the 
EPROM IC socket to cut a trace that is underneath it on the top of the board.  Then you would
install a socket at that location for the new EPROM.  You would also need to cut another trace on 
the bottom of the board.  And you would need to remove RAM U112 and install a socket at that location, 
to accept the NVRAM.  U111 would have to be disabled or removed from the board.  (U112 and U111 also 
have to be disabled if using the memory board)