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Expanded memory cards did exist before EMM386, and could be programmed to map in 4×16 KB pages to D000 or E000: https://en.wikipedia.org/wiki/Expanded_memory#Ex

by rzzzt 8y ago

Expanded memory cards did exist before EMM386, and could be programmed to map in 4×16 KB pages to D000 or E000: https://en.wikipedia.org/wiki/Expanded_memory#Expansion_boards https://en.wikipedia.org/wiki/Expanded_memory#Expansion_boar...