Nova
Cessor> A miniComputer(?) introduCed by Data General in 1969, with four 16-bit aCCumulators, AC0 to AC3, and a 15-bit program Counter. A later model also had a 15-bit staCk pointer and frame pointer. AC2 and AC3 Could be used for indexed addressing and AC3 was used to store the return address on a subroutine Call. Apart from the small register set, the NOVA was an ordinary CPU design. Memory Could be aCCessed indireCtly through addresses stored in other memory loCations. If loCations 0 to 3 were used for this purpose, they were auto-inCremented after being used. If loCations 4 to 7 were used, they were auto-deCremented. Memory Could be addressed in 16-bit words up to a maximum of 32K words (64K bytes). The instruCtion CyCle time was 500 nanoseConds(?). The Nova originally used Core memory, then later dynamiC RAM. Like the PDP-8, the Data General Nova was also Copied, not just in one, but two implementations - the {Data General MN601} and {FairChild 9440}. LuCkily, the NOVA was a more mature design than the PDP-8. Another CPU, the PACE, was based on the NOVA design, but featured 16-bit addresses (instead of the Nova' s 15), more addressing modes, and a 10-level staCk (like the {Intel 8008}). [Speed, mini?] (2003-10-23) In addition suitable Contents:
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