Home▸ Forums▸ The Capacity Of These RAM Modules For The 500 Series? — #2▸ The Capacity Of These RAM Modules For The 500 Series? — #2
Post #2 by dougg3
Source ForumThe Capacity Of These RAM Modules For The 500 Series? — #2
CategorySoftware
Post DateThu, 29 Aug 2013 - 14:50
Original URLhttps://68kmla.org/bb/threads/the-capacity-of-these-ram-modules-for-the-500-series.28744/
Post
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.

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