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Words starting with motorola6

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  • motorola — Motorola, Inc.
  • motorola 14500b — (processor)   (MC14500B) A 1-bit ICU from Motorola. Probably the limit in small processors, the 14500B had a 4-bit instruction and controlled a single data read/write line, used for application control. It had no address bus - that was an external unit that was added on. Another CPU could be used to feed control instructions to the 14500B in an application. It had only 16 pins, less than a typical RAM chip, and ran at 1 MHz.
  • motorola 6800 — (processor)   A microprocessor released shortly after the Intel 8080, in about 1975. It had 78 instructions, including the undocumented HCF (Halt and Catch Fire) bus test instruction. The 6800 evolved into the Motorola 6801 and 6803. The 6502 was based on the design of the 6800 but had one less data register and one more index register.
  • motorola 68000 — (processor)   (MC68000) The first member of Motorola, Inc.'s family of 16- and 32-bit microprocessors. The successor to the Motorola 6809 and followed by the Motorola 68010. The 68000 has 32-bit registers but only a 16-bit ALU and external data bus. It has 24-bit addressing and a linear address space, with none of the evil segment registers of Intel's contemporary processors that make programming them unpleasant. That means that a single directly accessed array or structure can be larger than 64KB in size. Addresses are computed as 32 bit, but the top 8 bits are cut to fit the address bus into a 64-pin package (address and data share a bus in the 40 pin packages of the 8086 and Zilog Z8000). The 68000 has sixteen 32-bit registers, split into data and address registers. One address register is reserved for the Stack Pointer. Any register, of either type, can be used for any function except direct addressing. Only address registers can be used as the source of an address, but data registers can provide the offset from an address. Like the Zilog Z8000, the 68000 features a supervisor and user mode, each with its own Stack Pointer. The Zilog Z8000 and 68000 are similar in capabilities, but the 68000 is 32 bits internally, making it faster and eliminating forced segmentations. Like many other CPUs of its generation, it can fetch the next instruction during execution (2 stage pipeline). The 68000 was used in many workstations, notably early Sun-2 machines, and personal computers, notably Apple Computer's first Macintoshes and the Amiga. It was also used in most of Sega's early arcade machines, and in the Genesis/Megadrive consoles. Variants of the 68000 include the 68HC000 (a low-power HCMOS implementation) and the 68008 (an eight-bit data bus version used in the Sinclair QL).
  • motorola 6801 — (processor)   (And 6803) A version of the Motorola 6800 with ROM, some RAM, a serial I/O port and other functions on the chip. It was meant for embedded controllers, where the part count was to be minimised. The 6803 led to the 68HC11 and that was extended to 16 bits as the 68HC16.
  • motorola 68010 — (processor)   A microprocessor from Motorola. It was the successor to the Motorola 68000 and was followed by the Motorola 68020. Some instructions which were previously user mode were made system mode, which necessitated patches to a few programs. The 68010's main advantage over the 68000 was that it could recover from a bus fault. The 68000 microcode didn't save enough state to restart all instructions; the 68010 corrected this fault. This allowed it to use paged virtual memory. The 68010's DBxx (decrement and branch) instructions could hold and execute the preceding instruction in the prefetch buffer, allowing some two-instruction loops to execute without refetching instructions. At one time there was a 68010 variant that was pin-for-pin compatible with the 68000. Early Amiga hackers replaced their 68000s with 68010s in order to get a small performance increase.
  • motorola 68020 — (processor)   A microprocessor from Motorola. It was the successor to the Motorola 68010 and was followed by the Motorola 68030. The 68020 has 32-bit internal and external data and address buses and a 256-byte instruction buffer, arranged as 64 direct-mapped 4-byte entries[?]. The 68020 added many improvements to the 68010 including a 32-bit ALU and external data bus and address bus, and new instrucitons and addressing modes. The 68020 (and 68030) had a proper three-stage pipeline. The new instructions included some minor improvements and extensions to the supervisor state, some support for high-level languages which didn't get used much (and was removed from future 680x0 processors[?]), bigger (32 x 32-bit) multiply and divide instructions, and bit field manipulations. The new adderessing modes added another level of indirection to many of the pre-existing modes, and added quite a bit of flexibility to various indexing modes and operations. The instruction buffer (an instruction cache) was 256 bytes, arranged as 64 direct-mapped 4-byte entries. Although small, it made a significant difference in the performance of many applications. The 68881 and the faster 68882 FPU chips could be used with the 68020. The 68020 was used in many models of the Apple Macintosh II series of personal computers and Sun 3 workstations.
  • motorola 68030 — (processor)   A 32-bit microprocessor in Motorola's Motorola 68000 family, with on-chip split instruction and data cache of 256 bytes each. The 68030 has an on-chip MMU (except in the 680EC30 version). The 68881 and the faster 68882 FPU chips could be used with the 68030. The 68030 was the successor to the Motorola 68020, and was followed by the Motorola 68040. The 68030 is used in many models of the Apple Macintosh II series of personal computers.
  • motorola 68040 — (processor)   (MC68040) A microprocessor from Motorola. It was the successor to the Motorola 68030 and was followed by the Motorola 68060. The 68040 was the first 680x0 family member with an on-chip FPU. It also had split instruction and data caches of 4 kilobytes(?) each. It was fully pipelined, with six stages. The 68040 was used in the Apple Macintosh Quadra series of personal computers. The MC68LC040 is an MC68040 without a built-in FPU, and the MC68EC040 is an MC68040 without an MMU or FPU.
  • motorola 68050 — There was no 68050. The successor to the Motorola 68040 was the Motorola 68060. The even numbers (68000, 68020, 68060) were reserved for major revisions to the 680x0 core. The odd numbers (68010, 68030, 68050) were minor upgrades from the previous chip. For example, the Motorola 68010 was a Motorola 68000 with some minor enhancements and modifications to some user/superuser instruction assignments. The Motorola 68030 was a Motorola 68020 with an MMU and more minor enhancements. The 68050 would have been a 68040 with some bugs fixed, which didn't really warrant a new name so it was sold as a 68040.