to do then now would be retro, to do then then was very nowtro
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6809 Assembly

since 1977 (earliest usage recorded on this site was 1976)

The Motorola 6809 is an 8-bit (with some 16-bit features) microprocessor CPU from Motorola, introduced circa 1977-78. It was a major advance over both its predecessor, the Motorola 6800, and the related MOS Technology 6502.

Among the significant enhancements introduced in the 6809 were the use of two 8-bit accumulators (A and B, which could be combined into a single 16-bit register, D), two 16-bit index registers (X, Y) and two 16-bit stack pointers. The index and stack registers allowed very advanced addressing modes. Program counter relative addressing allowed for the easy creation of position-independent code, while a user stack pointer (U) facilitated the creation of reentrant code.

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danceswithvowels
mnulli
cloudssanswater
jtauber
njr
hexdump42
codewritinfool
dabeaz
undoingemptyvoid
karmakaze
davidpaccoud
danceswithvowels - 6 years
mnulli - 2 years
cloudssanswater - 6 years
jtauber - 42 years
njr - 3 years
hexdump42 - 5 years
codewritinfool - 4 years
dabeaz - 1 years
undoingemptyvoid - 1 years
karmakaze - 1 years
davidpaccoud - 2 years
danceswithvowels
1976–1981
First job out of school. Got to write a real-time kernel and SCADA systems for oil&gas and fiber industries. And enhance a homegrown assembler written in FORTRAN.
mnulli
1978–1979
Comment is wrong on at least one point, based apparently on a mistake in Wikipedia. The 6800 already had A and B accumulators. The interesting thing about the 6809 was that if you wanted to do something, the first way you thought of was probably pretty close to the best you were going to do. Compare and contrast to the 6502 where serious skull sweat could be rewarded with significant performance gains.
cloudssanswater
1981–1986
jtauber
1983–
A truly beautiful instruction set. The first assembly language I learnt and still my favourite. I learnt using the EDTASM cartridge for the TRS-80 CoCo.
njr
1984–1986
Well, it was slightly better than 6502!
hexdump42
1984–1988
codewritinfool
1984–1987
undoingemptyvoid
1985
College course - final project for our class was implementing a symbolic debugger. Very cool. Loved Motorola over Intel - hate segment registers.
dabeaz
1985
Played with controlling some hardware devices using a 6809 card for a S100 bus system. Involved punching codes in directly with a hex keypad.
karmakaze
1986
A sane processor
davidpaccoud
1997–1998
Micro-controllers programming for embedded systems at the University. Coming from 68000 Assembly the instruction set was more limited but still quite powerful.
abcoates
alelondon

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