084f2db8c6 ^ "Motorola reveals MC68SEC000 processor for low power embedded applications" at the Wayback Machine (archived March 28, 1997), Motorola press release, November 18, 1996. This interrupt routine would handle the virtual memory functions and restart the "leading" 68000 in the correct state to continue properly synchronized operation when the "main" 68000 returned from the interrupt. The "extend" (X) flag deserves special mention, because it is separate from the carry flag. Motorola replaced the MC68008 with the MC68HC001 in 1990.[8] This chip resembled the 68HC000 in most respects, but its data bus could operate in either 16-bit or 8-bit mode, depending on the value of an input pin at reset. .. Pre-release XC68000 chip manufactured in 1979. (A0) Address with pre-decrement, e.g.
15 . In 1982, the 68000 received an update to its ISA allowing it to support virtual memory and to conform to the Popek and Goldberg virtualization requirements. Early versions of these used a specialized microcontroller with a static 68EC000 core; later versions use a standard MC68SEC000 processor. The 68000 continued to be widely used in printers throughout the rest of the 1980s, persisting well into the 1990s in low-end printers. The Sega Genesis game console uses a 68000 processor (clocked at 7.67MHz15/7 the NTSC video colorburst frequency) as its main CPU, and the Sega CD attachment for it uses another 68000 (clocked at 12.5MHz). ^ [4] "historic-mess / src / mame/ drivers / cischeat.c", Retrieved 2016-1-15. Several companies did succeed in making 68000-based Unix workstations with virtual memory that worked by using two 68000 chips running in parallel on different phased clocks. This mode was very useful for position-independent code.
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