3 ms·

I still have a Motorola 6809 TRM that has artwork right on the cover about how the 6809 was a "bridge" processor to transition you from the 6800 to the 68000.

I still have a Motorola 6809 TRM that has artwork right on the cover about how the 6809 was a "bridge" processor to transition you from the 6800 to the 68000. https://m.media-amazon.com/images/I/51Pu7b17-CL._SR600%2C315_PIWhiteStrip%2CBottomLeft%2C0%2C35_SCLZZZZZZZ_FMpng_BG255%2C255%2C255.jpg https://m.media-amazon.com/images/I/51Pu7b17-CL._SR600%2C315... Let's all pour one out for the D register.

cmrdporcupine 3y ago
Kind of weird though, the 6809 was developed concurrent to the 68k, by an entirely different team at Motorola and its instruction set looked nothing like the 68000. The only thing they had in common was the "68" prefix and big-endian-ness. I guess there was also the ability to interface the 68k with 6800/6809 support chips on the bus, though. The 68000 was very VAX and PDP-11 inspired.