Talk:Motorola 6809

message: what do simm dimm stand for. — Preceding unsigned comment added by 196.4.80.2 (talk) 08:31, 10 October 2002 (UTC)
replies: text: Single inline memory module, and dual inline memory odule respectively. Why the question here, rather than the reference desk? ww 04:09, 13 May 2006 (UTC)
thread_title: SIMM, DIMM? 

message: Sure, the processors came out in roughly the same time period, had several designers in common, and similar design criteria - but the 650x is hardly a clone of the 6809. They're useful to compare and contrast, but they're hardly identical. What's the fascination with clamining one's a clone of the other? --moof 04:58, 16 November 2005 (UTC)
replies: text: The 6502 was an outgrowth of the earlier 6800. Chuck Peddle and people eventually ended up at MOS Technology, and their first effort the 6500 was deemed too close to the 6800 and an infringement on Motorola's design. It actually had little to do with the 6809, whose design was influenced by an analysis of large amounts of 6800 assembly code. The 6502 was used in many of the early machines (the KIM-1 (and other trainers), various Commodores, the Ataris, Apple I and II, ...) not for its great virtues as an architecture (quite limited, really), but because it was priced much lower than the somewhat comparable competition. As near as I could tell at the time, no such fascination was justified. ww 04:07, 13 May 2006 (UTC)
thread_title:  650x comparisons 

message: I have added the official Motorola programming manual as reference. This should be moved from Further reading to (preferably the first) reference, because it is *the*  primordial source on the 6809 instruction set. It is also referenced where I mention the assis09. Please help, because I don't know how to do that.  — Preceding unsigned comment added by 80.100.243.19 (talk) 22:18, 17 January 2015 (UTC)
thread_title:  Please fix reference 

message: if you have a 6809 E processor you have a processor brand say 6809 and the E stands for External Clock.
if you have a 6203 processor it is supposed to be an earlier processor. So it's instruction set could be less complicated.
It's a FACT processors which have a higher number are supposed to be more intelligent. Because why should you add the higher number without upgrades to the processor possibilities. The article is riddled with wrong processor numbers who would be perform less than the higher version ones. It would be good this should be repaired in this article.  — Preceding unsigned comment added by 85.145.0.77 (talk) 19:00, 8 March 2017 (UTC)
thread_title:  version numbers of processors conflict with what they can do more or less 

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thread_title:  External links modified (February 2018) 

message: It would be nice to add an example subroutine, such as the strtolower() example used for some of the other microprocessors (e.g., 6502, 80386, 68000, etc.). — Loadmaster (talk) 17:39, 22 May 2018 (UTC)
thread_title:  Example code 

message: I worked at DG in 1987 to 1991 in the terminals group (Durham NH and then Westborough MA - “Webo”).
The Dasher series of character cell terminals were built around the 6809, including the D210-D213, D217, D410-D413, D460-D463, and D578E “security terminal.” Also the Panther series of dot matrix printers were built on the 6809.
In the terminals, the 68B09E was connected to a standard cell custom graphics chip called “HILT” (high integration level terminal), 8KB OTP PROM, 16KB SRAM, and 256KB DRAM that was used for video generation. The HILT did cycle-stealing to fetch the characters and attributes from SRAM, and did a look-up in DRAM to generate video. DRAM with the character bit patterns (or graphics) were loaded using a window mapped by HILT registers.
(Numbers above varied by model and are to the best of my recollection 30+ years later. :->) James.d.carlson (talk) 11:45, 9 September 2022 (UTC)
thread_title:  Use in Data General peripherals 

message: Motorola did an analysis of code written for the 6800 and other 8-bit microprocessors, looking for bottlenecks and other places they could improve things, and the 68000 and 6809 projects were started on two independent concurrent tracks using what they learned from that analysis.
Motorola wanted a CPU to use as a core in SOCs, and the 6809 would have too many transistors for SOCs of the time frame, so they made some smaller improvements in the 6800 to make the 6801. (Fixed compare X, added 16-bit add, subtract, and shift, also added push and pop X -- small but really significant improvements.) The 6801 actually came out after the 6809, by a few months.
Even though the 6801 core did not use that many more transistors than the 6800, the customer wanted even less, so they could have more built-in peripherals -- advanced timers and such, so Motorola really pared things down and gave them the 6805, which started a really successful line in SOC/embedded. The 6805 removed the B accumulator and cut the index register in half, making it less of a pointer and more of an index register.
The 68HC11 simply extended the 6801 by adding a Y index register. Since it has none of the advanced addressing modes of the 6809, it really should not be presented as a variation of the 6809, or even a stripped-down 6809. It's a simple extension of the 6801, designed to keep the transistor count down to leave transistors available for built-in peripherals like those in the 6805.
These facts can be confirmed quickly be reference to the data sheets. 60.130.192.5 (talk) 10:04, 26 November 2022 (UTC)
thread_title:  68C11 is not a variation of the 6809