Real=time clock and index register controller for portable computer - restarts following power interruption using stored information in back-up RAM for initialisation process

摘要

A portable computer has start up routines stored in a ROM memory (12) coupled to a bus (10A) that supports the system modules and connects with the CPU. A RAM memory (13) stores the program and data used and is associated with a DMA controller (14). A real-time clock or index register unit has an index stage (51), data register (53) and system register (55). A memory (19) stores data during a power supply interruption and the data is used during restart. ADVANTAGE - Provides correct operation during power-up restart.