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  • What limited the use of the 6809 CPU in personal computers?
    By time the 6809 was readily available other 8 bit CPUs were already well established and going downward in price From an ISA perspective the 6809 walked all over any CPU available - but concepts of clean code structure were minor considerations still in the PC world
  • 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 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
  • 6809 - Advantages of a Hitachi HD6309 versus a plain Motorola MC6809 . . .
    HITACHI says in the manual of 6309 that 6309 is compatible with 6809, but some OS-9 hackers found that it has secret features It has following features: 1 More registers (additional two 8 bit accumulators, 8 bit register, and a 16 bit register), 2 Two modes (6809 emulation mode and native mode), 3
  • Motorola 6809 two stacks design - Retrocomputing Stack Exchange
    Also the implementation is different: The later 68000 uses both stacks as system stacks (i e stores return addresses for JSR BSR TRAP and interrupts there) in user and supervisor mode, while the 6809 leaves the "U" stack to exclusive use by the application (i e the only instructions that put something there are the equivalents of "push" and
  • How did the 6809 achieve source-code compatibility with the 6800?
    The 6809 has 59 instructions, as compared with 78 on the 6800 So far as I can see, the 6809 lacks instructions that the 6800 has, such as aba, eorb and the transfer instructions (tba, tap and the like) Still, Wikipedia claims: The 6809 is assembler source-compatible with the 6800, though the 6800 has 78 instructions to the 6809's 59
  • 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, compared to its closest competitor, the Z80A, for $14 50 Transistor counts for the Z80 and 6809 were 8500 and 9000 respectively, a very small difference
  • 6809 - Why did MC6809(E) require two-phase clock consisting of two . . .
    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 x4 XTAL, but MC6809E, lacking XTAL generator, requires such phases as the input, so it could be thought as the internal requirement
  • 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
  • How to use rounding with 6809 multiplication
    The 6809 doesn't have hardware division, but if you can accept the result being sometimes off by one, then the approximation is quick and easy, multiplying by the reciprocal of the dividend, converted to a fixed-point binary fraction You can do this without rounding and get results that are close, but often off by one





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