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  • What limited the use of the 6809 CPU in personal computers?
    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 reentrant code in a simple and straightforward way, without using difficult programming tricks
  • 6809 - Advantages of a Hitachi HD6309 versus a plain Motorola MC6809 . . .
    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?
    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 assembler translated into equivalent operations and some were even replaced by addressing modes
  • Are the 6809 and 6809E different from a programmers point of view?
    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 has a specific set of undocumented instructions), but 6809 and 6809E are the same chips, the only difference is the clock generating part
  • Motorola 6809 two stacks design - Retrocomputing Stack Exchange
    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 68000 The 6809 has nothing comparable to a supervisor mode Also the implementation is different: The later 68000 uses both stacks as system stacks (i e stores return addresses for JSR BSR TRAP and
  • How useful were the 6809 6309s indirect addressing modes?
    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 processing Essentially the basics for any operating system, thus simplifying and speeding up OS programming including any kind of list defined I O Especially the latter is quite powerful in a concurent
  • Whats the timeline of Motorola 6800-family CPUs from 1974 to 1979?
    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, the 6802 microcontroller with the same registers and instruction set as the 6800
  • Newest 6809 Questions - Retrocomputing Stack Exchange
    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 $38, compared
  • Motorola 6809 Stack Blasting
    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 cycles plus one per byte, which is much faster than other methods of writing to memory So by pointing the stack registers (U and or S) at the area of memory you want to read from and or write to, you can quickly
  • Why was the 6809 so expensive? - Retrocomputing Stack Exchange
    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 $38, compare





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