(Topic ID: 354728)

MPU089 Rottendog NVRAM

By siddhartha

32 days ago



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#1 32 days ago

I have this MPU89 to replace a WPC98. I want to change the current 62256 SRAM to NVRAM. From the picture, you can see it looks double(?) socketed. Would I be able to drop in the more common 6264 NVRAM or do I have to find 62256 NVRAM?

20240304_233955 (resized).jpg20240304_233955 (resized).jpg
#2 31 days ago

My guess is Rottendog was having trouble finding DIP SRAM so they used a pin out adapter board. It is probably just a straight SO28 to DIP28 adapter board but the chip is on the bottom. Not sure why they double stacked a socket.

Unless Rottendog did something unexpected, a FM1608 based NVRAM should drop in and work even if board jumper is set to 62256 (no CE2 on FM1608)

2 weeks later
#3 14 days ago

I removed the SRAM and adapter board and slipped in a 6264 NVRAM. It works great!

#4 13 days ago
Quoted from barakandl:

Not sure why they double stacked a socket.

barakandl probably to prevent the board mounted socket from being damaged by the legs they put the RAM module.
I use this method to prevent even machine pin SIPs from damaging sockets.
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