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| • | 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 SIMM's S1 and S2. - A location diagram is here. - A diagram showing bit breakdown is here. - Both SIMMs need to be present. - According to here, in the 5162, "industry-standard 30-pin, of 256KB, with parity, of 150ns access time (or faster), of 256cycle/4ms refresh", should work as a substitute to what was fitted by IBM. - If either SIMM fails, the symptoms presented depend on the type of video card fitted: * MDA or CGA card: You will see a 201 error which points to address 000000. * Other: No visual nor audible indication. A POST card will reveal the situation (per 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. - A diagram showing bit breakdown is here. - If required, this memory can be disabled via jumper block J10. |
| • | 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 maximum 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. |
