Examples of 41128 type RAM chips

128K by 1 bit, in a particular pin configuration ('pinout').

The 41128 consists of two stacked (piggybacked) chips. The top chip is slighly different to the bottom chip. If you are interested in the detail of the difference used in the 41128, read the datasheets (datasheet links in table below).

The 41128 is by no means the first and only stacked (piggybacked) chip arrangement. As an example, click here to see some earlier chips from 1982.

IMPORTANT:	Putting aside the major difference of access time, the vast majority of 41128 type chips shown below are functionally the same.
	However, there can be subtle differences, ones that result in a particular 41128 chip not being suitable for your purpose.
	Sometimes, a device maker will produce a list of chips known to be compatible with their device.

Make	Part Number	Access Time	Photo	Source	Source	Datasheet	Comment
Hitachi	HM48128P-2	150 ns	photo				Hitachi appear to use -2 for 150 ns (e.g. see their 4116 and 4164 chips).

Micron	MT1128-15	150 ns
Micron	MT1128-20	200 ns					200 ns is unsuitable for the IBM 5170 (IBM AT) and cards.

Mostek	MK4128N-15	150 ns	photo
Mostek	MK4128N-20	200 ns	photo				200 ns is unsuitable for the IBM 5170 (IBM AT) and cards.

Samsung	KM4128U-15	150 ns	photo			datasheet
Samsung	KM4128U-20	200 ns				datasheet	200 ns is unsuitable for the IBM 5170 (IBM AT) and cards.

Texas Instruments	ZA1250NL	150 ns	photo				This is the most common RAM chip found on an IBM 5170 motherboard of type 1
Texas Instruments	TMS41128A-15NL	150 ns	photo
Texas Instruments	TMS41128B-15NL	150 ns		41128 list 1		datasheet