LYCOS RETRIEVER 
Motorola 6809
built 653 days ago
The Motorola 6809 processor is a very powerful successor of the 6800. Not only does it have more registers, like an extra index register and a user definable stack pointer, but some very powerful addressing modes were added as well. The direct page addressing mode is changed in a way that the direct page can now be located in any memory page you like.
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The Motorola 6809 was a major advance over its predecessor, the 6800. It was optimised so that the instructions were hardwired into the processor, rather than being written in microcode. This made for faster processing.
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The OS9L1 is an OS9 level One emulator (for Motorola 6809) that runs under UNIX/Linux. It is almost full-featured, and can emulate fork, signals, pipes etc. All without needing the OS9 kernel from Microware.
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The Motorola 6809 is an 8-bit (arguably, an 8/16-bit) microprocessor CPU from Motorola, introduced circa 1979. It was a major advance over both its predecessor, the Motorola 6800, and the related, MOS Technology 6502.
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In 1978, Southwest introduced the /09 computer based on the new Motorola 6809 microprocessor. each of 16 bits. Of the Motorola models, Southwest chose to use the 68B09, for 2MHz operation. For users wishing to upgrade their 6800 systems, Southwest provided update documentation to accommodate the new processor.
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Neither Motorola nor Hitachi produce 6809 processors or derivatives anymore, despite the 6809 being one of the most powerful general-purpose 8-bit CPUs ever produced. Many of its innovative features have since been copied. 6809 cores are available in VHDL and can be programmed into FPGA and used as an embedded processor with speed ratings up to 40 MHz. Some 6809 opcodes ... live on in the Freescale embedded processors.
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