The Capacity Of These RAM Modules For The 500 Series?

The module on the left uses a Hitachi HM5117400A chip. Well, it's an HM5117400ATS6, which means it's 60 ns and in a TSOP package:

http://www.datasheetarchive.com/HM5117400A-datasheet.html

Each one of those chips is 4,194,304-word * 4-bit, or in other words 16 megabits or 2 megabytes. There are 16 of them, so it looks like the left module is 32 megabytes.

The module on the right uses (I think) a Fujitsu MB8117400, again 60 ns. I'm not 100% sure on this one, but it appears very likely.

http://www.datasheetarchive.com/MB8117400A-50%2F-60%2F-70-datasheet.html

This one is also 16 megabits (2 megabytes), and again 16 chips, so I think the right module is also 32 megabytes.

Thank you! That's where I was screwing up, I was reading the datasheets as 16 megabytes, I was like "...There is no way that is correct..."

Well, looks like I'll have a spare 32 MB card to put up in the trading forum once they arrive. Assuming they both work correctly.

Now I just have to figure out which one to keep. I think I'll go with the spectrum eng. one. That one seems more like the design I am familiar with.

Doug, you were right, they are both 32 MB cards. I guess I got lucky, or they're easier to find than people think.

Thanks for coming back and confirming! I was curious if I was reading the datasheets correctly.