The 6809 was the first microprocessor able to use fully position-independent code without the use of programming tricks.

This is because the Z80 combines two full ( but short ) clock cycles into a relatively long memory access period compared to the clock, while the more asynchronous 6809 instead has relatively short memory access times: depending on version and speed grade, approximately 60 % of a single clock cycle was typically available for memory access in a 6809 ( see data sheets ).

The Motorola 6809 was originally produced in 1 MHz, 1. 5 MHz ( 68A09 ) and 2 MHz ( 68B09 ) speed ratings.

However, there is a certain amount of design philosophy similarity ( e. g., considerable orthogonality and flexible addressing modes ), some assembly language syntax resemblance, as well as opcode mnemonic similarity, but the 6809 is a derivative of the 6800 whereas the 68000 was a totally new design.

In that respect, the 6809 was rather quickly an evolutionary dead-end.

The 6809 was used in Commodore's dual-CPU SuperPET computer, and, in its 68A09 incarnation, in the unique vector graphics based Vectrex home video game console with built-in screen display.

The 6809 was used in the Milton Bradley Expansion ( MBX ) system, which was an arcade console which was used with the Texas Instruments TI-99 / 4A home computer.

In addition to home computers and game consoles, the 6809 was also utilized in a number of arcade games released during the early to mid 1980s.

The KONAMI-1 was a modified 6809 used by Konami in various arcade sets such as The Simpsons.

The 6809 CPU was also used in traffic signal controllers made in the 1980s by several different manufacturers.

The Hitachi 6309 was an enhanced version of the 6809 with extra registers and additional instructions, including block move, additional multiply instructions and hardware-implemented division.

Additionally, the 6809 processor was used in the late 1980s through the early 2000s in Motorola Smartnet Trunking Controllers ( dubbed the 6809 controller ).

The first version (" OS-9 Level One "), which dates back to 1979 – 80, was written in assembly language for the Motorola 6809 CPU, and provided a single 64 KB address space in which all processes ran.

It was developed as a supporting operating system for the BASIC09 project, contracted for by Motorola as part of the 6809 development.

In 1983, OS-9 / 6809 was ported to Motorola 68000 assembly language and extended ( called OS-9 / 68K ); and a still later ( 1989 ) version was rewritten mostly in C for further portability.

Even on the CoCo, a quite minimalist hardware platform, it was possible under OS-9 / 6809 Level One to have more than one interactive user running concurrently ( for example, one on the console keyboard, another in the background, and perhaps a third interactively via a serial connection ) as well as several other non-interactive processes.

Microware initially produced a version of BASIC and a real-time kernel for the Motorola 6800 processor, and was asked by Motorola to develop what turned into BASIC09 for the then-new Motorola 6809 processor.

The downside of the system was that it required much more advanced decoders, typically featuring Zilog Z80 or Motorola 6809 processors with RGB and / or RF output.

The downside was that it required much more advanced decoders, typically featuring Zilog Z80 or Motorola 6809 processors.

While in " Emulation Mode " it is fully compatible with the 6809.

Additions to the 6809 are shown with blue type.

This means it can be used with external DMA without needing refresh every 14 cycles as the 6809 does.

* There are two additional 8-bit accumulators, E and F. These can be concatenated to form a 16-bit accumulator called W. The existing 6809 16-bit accumulator, D, can also be concatenated with W to form a 32-bit accumulator Q.

The Motorola 6809 is an 8-bit ( with some 16-bit features ) microprocessor CPU from Motorola, designed by Terry Ritter and Joel Boney and introduced 1978.

Software development company Microware developed the original OS-9 operating system ( not to be confused with the more recent Mac OS 9 ) for the 6809, later porting it to the 68000 and i386 series of microprocessors.

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.

* German electronics manufacturer Eltec has been manufacturing the Eurocom-model CPU boards for industrial purposes since the late seventies, starting with the 6802 and 6809 Eurocom-1 and Eurocom-2, and onwards with 68K, and derivative, CPU boards up to today.

Several other buses were designed with minor improvements on the S-100 bus: the 50-pin " Benton Harbor Bus " used in the Heathkit H8 ; the SS-50 Bus used in a variety of 6800 and 6809 computers.

By about 1980, TSC had developed a Unix-like multi-user, multi-programming operating system ( UniFlex ), for 6809 systems with DMA 8 " floppy disks and extended memory.

Processors with 16-bit addressing ( Z80, 6502, 6809, etc.

In 1982, Gyruss, known for its stereo sound and musical score, utilized multi CPUs, which included two Z80 microprocessors, one 6809 microprocessor, and one 8039 microprocessor, along with five AY-3-8910 sound chips and a DAC for the sound.

Four GMS 204 units were controlled from a 6809 microprocessor, with the program stored in a solid-state plug-in memory module.

TSC never bundled a C compiler with UniFLEX for the 6809, though they produced one.

In microcomputers, SWTPC's 6800 and 6809 machines used TSC's FLEX disk operating system, Radio Shack's TRS-80 machines used TRS-DOS, their Color Computer used OS-9, and most of the Intel 8080 based machines from IMSAI, MITS ( makers of the legendary Altair 8800 ), Cromemco, North Star, etc., used the CP / M-80 disk operating system.

Other well known 8-bit microprocessors that emerged during these years were Motorola 6800 ( 1974 ), General Instrument PIC16X ( 1975 ), MOS Technology 6502 ( 1975 ), Zilog Z80 ( 1976 ), and Motorola 6809 ( 1978 ).

* Comp Consultants ( later renamed MGlobal ), a Houston-based company originally created CCSM on 6800, then 6809 processors, and eventually a port to the 68000, which later became MacMUMPS, a Mac OS based product.

* Motorola 6800 / 6809, 8-bit

The instruction set and register complement were highly orthogonal, making the 6809 easier to program than the 6800 or 6502.

* Motorola 6809 ( 1978 partially 6800 compatible )

Occasionally and variously renamed after the release of the 6800, 6809, and other microprocessors, the group continues to meet monthly in Cupertino, California.

The extended 8 KB version was then generalized into BASIC-80 ( 8080 / 85, Z80 ), and ported into BASIC-68 ( 6800 ), BASIC-69 ( 6809 ), and MOS Technology 6502-BASIC ( unfortunately spilling over to 9 KB, in an era when 8 KB ROM chips were standard ), as well as the 16-bit BASIC-86 ( 8086 / 88 ).

When microprocessors ( CPU chips ) became available, SWTPC became one of the first suppliers of microcomputers to the general public, focusing on designs using the Motorola 6800 and, later, the 6809 CPUs.

* 6800 / 6809 Flex Emulator for x86 based Microsoft operating systems

A Motorola 6809 central processing unit handles the graphics and gameplay, while a Motorola 6800 microprocessor handles the audio.

Southwest Technical Products Corporation ( SWTPC ), produced the SWTPC 6800 and later the SWTPC 6809 kits that employed the Motorola 68xx series microprocessors.

* SWTPC 6800 FLEX 2 and 6809 FLEX 9 emulator

Also more traditional " von Neumann based " single chip microcontrollers may be regarded as competitors, such as the 6800 / 6809 based Motorola 68HC11, the Hitachi H8 family, and Z80-derivatives, such as Toshiba TLCS-870, to name just a few.