8-bit CPUs normally use an 8-bit data bus and a 16-bit address bus which means that their address space is limited to 64 kilobytes; this is not a "natural law", however, and thus there are exceptions.
The first widely adopted 8-bit microprocessor was the Intel 8080, being used in many hobbyist computers of the late 1970s and early 1980s, often running the CP/M operating system. The Zilog Z80 (compatible with the 8080) and the Motorola 6800 were also used in similar computers. The Z80 and the MOS Technology 6502 8-bit CPUs were widely used in home computers and game consoles of the 70s and 80s. Many 8-bit CPUs or microcontrollers are the basis of today's ubiquitous embedded systems.
More on [ 8-bit ]

2500AD Simulator-Debugger - Includes disassemblers for many micro-processors, by Avocet Systems.
Meta Description: [ Avocet Systems builds professional tools for embedded systems development: c compilers, assemblers, simulators, in-circuit emulators, background mode debuggers, and an RTOS ]
6809 Emulation Page - Some disassemblers and debuggers for 6809.
Meta Description: [ 6809/6309 Emulation Page: 6809 Information, Assemblers, Emulators, Source codes And More... ]
M68HC11 Simulator - Have 68HC11 Disassembler by Rijswijk Institute of Technology.
Meta Description: [ The Motorola 68HC11 microcontroller is a popular electronic
device used in many applications. With this program you can
edit, assemble and simulate programs for the 68HC11 on your
windows PC. ]
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Tom's Timex Page - Contains two 6805 disassemblers by Tom Johnson.
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