IBM 1-8MB 286 Memory Expansion Adapter (MCA)

For more information, see this article's corresponding Wikipedia page: Device.

This device is in the WorkNeeded:OriginalParts category because it was flagged as missing information on the original parts. It may have replacement parts listed but those cannot be assumed to be identical to the originals. If you have a list of the original parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables

This device is in the WorkNeeded:ReplacementParts category because it was flagged as missing information on replacement parts. If it has the original parts listed you may be able to search for replacements using the parametric searches available from parts distributors. If you have or make a list of replacement parts, please feel free to add them by copying the relevant table from EditorsToolbox:Tables

This device is in the WorkNeeded:General category because it was flagged as missing general information about the device. The information may be incomplete, using default text, or inaccurate and should be verified with external sources if possible. If you can add or correct information on this page, please feel free to edit it and do so.

IBM 1-8MB 286 Memory Expansion Adapter (MCA)

Preliminary Information
Release Year	1987
Leak Risk	Low
Batteries	None
Mounting Technology	Through Hole
Capacitor Types	Tantalum
Destructive Entry	No

This MCA memory expansion card allows for up to 8MB of RAM to be installed in PS/2 Models 50, 50Z and 60. It supports extended memory and LIM EMS 3.2.

Known Issues

RAM installed on the card is not detected on POST

Causes

• Unknown

Solutions

• Unknown

Original Parts

P/N: 61X6752

P/N 61X6740 is printed on the board. Label on ROM chip U14 is dated 1986 and bears the P/N 11F8060.

Capacitor Specifications and Footprint Information

RefDes	Qty	Capacitance	Voltage	Mount	Diameter/Size	Height	Lead Spacing	Temp	Type	Brand	Series
	12	0 µF						0 °C	Tantalum		Markings: "104 C5K", "911 RAJ"
	18								Tantalum		Markings: "104 C5K", "907 RFS"
	2								Tantalum		Markings: "10-6", "2" (circled)

The capacitor series are unknown. Markings are provided for later identification.

Replacement Parts

Basic PCB Name

Capacitors

RefDes	Qty	Compatible Part Number	Order Links
			Digikey

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Kits

• Digikey BOM: https://www.digikey.com/

Related Links

• IBM Memory Expansion Adapters on Ardent Tool of Capitalism