41256 RAM Equivalent Question

[simondo]

Hi.
I hope someone can help.


I want to do the DK'Tronics Ram Upgrade as posted here a while ago [size=78%]http://www.cpcwiki.eu/index.php/Upgrading_a_Dk%27tronics_RAM_Expansion[/size]


I have come across some  Intel 21256. Are they the same as a 41256?


Thanks,

[Bryce]

Hi Simondo,
         the article was from me. The 21256 is pin compatible with the 41256. The only difference is that the 21256 has a fast page mode which the 41256 doesn't. I haven't ever tried using 21256 instead of 41256, but I think they would work, however I can't guarantee this. 41256 chips should still be easy to source though.

Bryce.

[simondo]

Thanks Bryce. Sorry for not crediting you in my last post

Theres some Intel 21256s on Ebay. Seller reckons that these Intel 21256 are same as 41256?

I also have some Hitachi HM51256P-10s at work. Looking at datasheets pinouts are also the same as 41256. Do you think these would work also?

[Bryce]

Yes, the 51256 will definitely work, I've used them in other computers to replace 41256 in the past.

Bryce.

[simondo]

That's great Bryce. Many thanks as always.


In that case .... I have a few 51256s if anyone else needs some.

[simondo]

Unfortunately I have got the SMD version PCB dated 10/90,so no upgrade for me