Static RAM (SRAM) help, equivalent part to a 65256-150???

ifkz

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Static RAM (SRAM) help, equivalent part to a 65256-150???

I am a step away from getting my board working, I have a spot that needs a chip with the part number 65256 and a speed of 150, which I know is commonly abbreviated -15. Is there anything greater I can use, also? Any cheap vendors?

I tried a chip marked LH52256L-90 from Sharp, but I think this is actually a 62256 from reading the datasheet.
 
Well, a Hitachi chip would be a HM65256BLP-12
Unfortunately, a normal 62256 won't work, it has to be a 65256 or the sprites have very strange flickering color faults.
 
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Ouch.

That's pseudo-static RAM which is an odd one. You can find that on some Sega boards.

What size is it? Is it the same width as an EPROM (.6 inches) or the width of most TTL logic (.3 inches)?

Raymond
 
Im showing qty 9 M5M5165P-15L which might work. Thats the only thing im showing in stock other than the 62256 but it might actually be the same as a standard one.
 
My bad, typed in the wrong pn. I meant M5M5256BP-10. Same pinout but I dont think it will sub the psuedo ram.
I use datasheet archive all the time :)
 
It is the same size package as a 27c512/27c256 etc. EPROM.
I found one on ebay but the price is sky high; the auction is a BIN/BO starting at $12.95 + $6.95 shipping. The board is worth it, and I'll pay if I have to, but that is excessive. A couple of my JAMMA boards have been cheaper than that!

I have a couple parts SEGA boards, but I would need the chip numbers they used, I could never find out what they meant. I have a parts Hang-On CPU board, a System 1, and a System 2 Choplifter board I can use.

I am also in contact with the owner of an unmodified board to try and get the part number of the specific chip that was originally in the slot.

Thanks for the help, there's going to be some more friend requests sent out after this repair :)
 
A nice owner e-mailed me a picture of his chip, it is a Hitachi chip HM65256BLP-10.
Fingers crossed that Riptor finds his source :)
 
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