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 …
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?
Motorola 6809 Stack Blasting
May 1, 2016 · The 6809 has a couple of instructions which provide very quick ways of pulling (popping) and pushing registers off and onto the stack, PULS / PULU and PSHS / PSHU. PSHx only takes 5 …
6809 - Why did MC6809 (E) require two-phase clock consisting of two ...
Jan 20, 2020 · However, 6809 requires rather strange two-phase clock (see here, page 3, that consists of two square waves shifted by 90 degree. Actually, MC6809 generates those phases internally from …
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 …
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 …
6809 - Where can I find the Motorola Application Note AN-754 ...
Aug 31, 2020 · Urgently need a copy of Motorola Application Note AN-754 "Device Operation and System Implementation of the Asynchronous Serial Interface Adapter". I have two boards from …