IBM 1-8MB 286 Memory Expansion Adapter (MCA)
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- 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 | 
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| 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 | 
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| 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. | 
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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.
| RefDes | Qty | Capacitance | Voltage | Mount | Diameter/Size | Height | Lead Spacing | Temp | Type | Brand | Series |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 12 | 100 nF | 0 °C | Tantalum | Markings: "104 C5K", "911 RAJ" | |||||||
| 18 | 100 nF | Tantalum | Markings: "104 C5K", "907 RFS" | ||||||||
| 2 | 10 uF | Tantalum | Markings: "10-6", "2" (circled) |
The capacitor series are unknown. Markings are provided for later identification.
Replacement Parts
Basic PCB Name
| 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/