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| • | Commonly known as conventional memory. |
| • | In IBM 5170 documentation and software, IBM refers to this as 'base' memory. |
| • | 512 KB is the most that can be fitted to the RAM sockets of the 5170 motherboard. Click here for information on the RAM chips and RAM banks used on the various types of 5170 motherboard. |
| • | If RAM between the addresses of 512 KB and 640 KB is desired, it can only be provided by way of an expansion card. |
| • | Commonly known as the Upper Memory Area (UMA). |
| • | Both ROM and RAM reside in this address space. |
| • | For the IBM 5170, refer to the diagram here. |
| • | RAM past the 1 MB address is commonly known as extended memory. |
| • | In IBM 5170 documentation and software, IBM refers to this as 'expansion' memory. Do not confuse 'expansion' with 'expanded'. |
| • | In an IBM 5170, conventional memory does not have to be at the 640 KB maximum before extended memory is added. Example. |
| • | 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 5170 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). |
| • | Click here to see some possible uses of extended memory in the 5170. |
| • | Click here to see discussion on a possible limitation on the amount of extended memory that can be added. |
