What limited the use of the 6809 CPU in personal computers?
Feb 19, 2018 · The 6809 had inherent advantages. From the Wikipedia: The 6809 was, by design, the first microprocessor for which it was possible to write fully position-independent code and fully …
Are the 6809 and 6809E different from a programmer's point of view?
Oct 13, 2020 · From the other point of view: there is no way how a program can decide if runs on 6809, or 6809E. There are methods to distinct between MC6809 and HD6309 programmatically (HD6309 …
Why was the 6809 so expensive? - Retrocomputing Stack Exchange
Oct 19, 2018 · The 6809 was released in 1978, but looking at the usual source for price quotes for old computer components, Byte magazine, I cannot find any quotes for 1979. December 1980 lists it at …
How useful were the 6809/6309's indirect addressing modes?
Oct 19, 2018 · The 6809 offers to combine indirect with either a fixed extended (16 Bit) address or all indirect indexed modes. These modes are extremely useful for all kinds of linked list and/or table …
What's the timeline of Motorola 6800-family CPUs from 1974 to 1979?
Jul 30, 2019 · 19 According to Wikipedia, The Motorola 6800 was released in 1974. Between that and the release of the 6809 in 1979 (or 1978?) there was at least one other 6800-series CPU released, …
6809 - Advantages of a Hitachi HD6309 versus a plain Motorola …
Apr 19, 2016 · Hitachi was a second source for the Motorola 6809 Micro Processor. The 6309 had many secret features. What advantages does the HD6309 have over the MC6809?
How did the 6809 achieve source-code compatibility with the 6800?
Feb 28, 2020 · The 6809 is assembler source-compatible with the 6800, though the 6800 has 78 instructions to the 6809's 59. Some instructions were replaced by more general ones which the …
trs 80 - Bank-switching a CoCo 2 to "All RAM" and back ...
May 14, 2025 · @Justme:that's not how a 64KB CoCo 2 works.On boot,24KB RAM above $7FFF are shadowed by ROMs;non-shadowed address-space intervals remain RAM,totaling slightly below …
Motorola 6809 two stacks design - Retrocomputing Stack Exchange
Jan 12, 2022 · Well, the intent behind the two-stack design we can only guess today. It was definitely not the same as the intent behind the later development of User and Supervisor Stack in the Motorola …
Hardware multipliers on classic CPUs - Retrocomputing Stack Exchange
Aug 22, 2018 · The 6809 is a complete new design, and the next generation after a 6800 or 6502, more in line with upcoming 16-bit processors of the same time. It seems that B or C models of the 6502 …