Programmable control of EMS page register addresses

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395425, 3642452, 364DIG1, G06F 1202, G06F 1200

Patent

active

054106621

ABSTRACT:
A full set of 36 EMS registers is provided for a computer, without using any of the registers located in the 256K to 640K address range of the standard RAM. This is accomplished by providing first and second alternate RAM sets of 12 registers each, which are accessed in the same 768K to 960K space as the standard twelve registers located in the 768K to 960K space. Access to the 24 registers in the first and second alternate sets of registers is controlled by two control bits. These bits translate address signals directed to the 768K to 960K space to be directed to one or the other of the first and second alternate sets of 12 registers; so that the alternate registers are accessed in the same space as the standard 12 registers in this 768K to 960K space.

REFERENCES:
patent: 5247631 (1993-09-01), Hilton et al.

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