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IBM 5162  -  RAM Information


0 KB to 640 KB

Commonly known as conventional memory.
In IBM 5162 documentation and software, IBM refers to this as 'base' memory.
In the 5162, conventional memory addressed 0 KB to 512 KB, resides on the motherboard in SIMMs S1 and S2.  A location diagram is here.
Both SIMMs need to be present.
If either SIMM fails, the motherboard will appear 'dead'  (noting of course, that symptom can have other causes).
A diagram showing bit breakdown is here.
In the 5162, conventional memory addressed 512 KB to 640 KB, resides on the motherboard in the six RAM chips adjacent to the power connector.  A location diagram is here.
If required, this memory can be disabled via jumper J10.
A diagram showing bit breakdown is here.


640 KB to 1 MB

Refer to the diagram here.


1 MB to 16 MB

Commonly known as extended memory.
In IBM 5162 documentation and software, IBM refers to this as 'expansion' memory. Do not confuse 'expansion' with 'expanded'.
In an IBM 5162, conventional memory does NOT have to be at the 640 KB maximim before extended memory is added.
Rules: Extended memory must start at the 1 MB address, and be contiguous (no gaps).
For example, if you have three 2 MB extended memory cards, the cards would be configured as follows:
         CARD #1: Address 1 MB to 3 MB
         CARD #2: Address 3 MB to 5 MB
         CARD #3: Address 5 MB to 7 MB
If you break any of the two rules, the 5162 will not 'find' all of your RAM.
Click here to see an example of a 4MB Intel InBoard card (providing 2 banks of 2 MB).