4 ms·

https://en.m.wikipedia.org/wiki/Motorola_6809 https://en.m.wikipedia.org/wiki/Motorola_6809

• forinti 7y ago
  I've never seen one in person, but from the specs, the Fujitsu 8 bit micros were the best and they used the 6809. My beloved beeb could only really compete in expandability.
• cmrdporcupine 7y ago
  The Hitachi 6309 is even better. But the problem with the 6809/6309 is that they max out at a clock rate of 3-4mhz and there's no new chips being made. Whereas WDC & Zilog still manufacture brand new 6502 and Z80 chips, and they clock way higher. A brand new 6502 can do 20mhz. So probably for retro projects that want a little more oomph, you're better off picking a 65816 clocked at 15mhz or so, than a 6809 at 4mhz. The 816 has relocatable direct page and stack like the 6809, too.
• ddingus 7y ago
  Strongly seconded, along with the Hitachi 6309. But the latter is hard to source. 6809 would be just fine. I keep a Color Computer 3, which has the 6809 stock, just because it's so much fun to program. Best of the 8 bit chips, if you ask me. You know, when David gets done with this system, it's not a big stretch to make one with a 6809. Maybe someone will. The 6502 was used because the Commodore kernel can be reused, or something like it can. It's not a total rewrite and that gets the project somewhere useful and familiar quickly. I don't blame 'em, and the 6502 is fun too. I also suspect a rewrite of those components, BASIC, etc... in 6809 would end up smaller, faster and more feature rich too. Big project though.