2023年9月25日 · When the Macintosh line switched to Power PC, the Motorola 68000 family begun to disappear. It's been rather the other way around. Apple switching was a result of Motorola losing the race. New contenders, such as the Power PC, ARM and MIPS take the …

2020年11月14日 · Motorola's 68000 was simply not ready at the time - and as well without second source (at the time) Zilog's Z8000 could have made it - except Zilog was (at that time) owned by Exxon, who at that time invested an extreme amount of money in what they perceived as a future without oil, creating Exxon Office System in direct competition to IBM in ...

2023年7月6日 · The Motorola 68000 has 16 (somewhat) general-purpose registers of 32 bits each, a generous complement by the standards of its day. I would expect these to take a significant fraction of the die area. (If they didn't, there would be little reason for competing microprocessors like the 8086 to fail to provide something similar.)

2020年10月17日 · Reading the Wikipedia article about real-time computing, I found written that:. Once when the MOS Technology 6502 (used in the Commodore 64 and Apple II), and later when the Motorola 68000 (used in the Macintosh, Atari ST, and Commodore Amiga) were popular, anybody could use their home computer as a real-time system.

The 68000 family was clearly designed with an eye towards high-level language programming. The architecture was 32-bit in concept, although the original implementations were 16-bit. It had "flat" unsegmented memory addressing, which is always easier for compilers, and could address 16MiB of RAM, which increased to 4GiB in later members of the ...

2019年7月30日 · [mot81] Motorola Microprocessors Data Manual. 1981. [mot83mpu] 8-Bit Microprocessor & Peripheral Data. Motorola, 1983. [mot83mcu] Single-chip Microcomputer Data. Motorola, 1983. [mot88v1] Microprocessor, Microcontroller and Peripheral Data, Volume I. Motorola, 1988. [oral] Motorola 6800 oral history panel: development and promotion. Computer ...

2020年6月29日 · In the 80s, the two great 16/32-bit desktop CPU architectures were the x86, used in the IBM PC and compatibles, and the 68000, used in the Amiga, Atari ST, Macintosh, early UNIX workstations and re...

2022年6月27日 · The 68000 documented that 32-bit values could be loaded or stored from half-word boundaries, and supporting software that did this in page-crossing scenarios was a major complication. If a fault stores the address of the faulted instruction, rather than the instruction following, I don't think identifying the bit patterns associated with pre ...

2019年7月24日 · For an 8Mhz 68000, there are 8,000,000 clock cycles per second. A bus cycle is the complete set of states that describes a bus interaction — most normally a read or write, and usually 4 cycles / 8 states long.

Got a question about how the 68000 addresses memory. Wikipedia says: The 68000 has a 24-bit external address bus and two byte-select signals "replaced" A0. Here is an image of the chip's pins...