It was the first CPU of the Macintosh under Raskin. When Jobs took over the switched to the 68k.
Motorola 6800
71–80 of 127 posts
Re: Motorola 6800
#72Earlier quoted context omitted.
I ran the C version of this benchmark using llvm-mos's Clang for the 6502. The results: 21.4 seconds 5793 bytes Which is middle of thepack for the Z80 benchmarks, but well below the 6502 ones. We're also using a slightly tweaked embedded printf written in C, so this could probably be improved somewhat there, sans any compiler changes.
Wow, I didn't realise there was a project to add a 6502 target to LLVM. Now to get Rust working...
Re: Motorola 6800
#73Re: Motorola 6800
#74Where does “6800” come from? I loved my Amiga and it had an MC68000 so I guess they just tacked on a zero for the 16-bit generation, but how were their series originally named?
Good question for retrocomputing.stackexchange.com!
Re: Motorola 6800
#75Earlier quoted context omitted.
The 6800 definitely is a classic, yes. The classics included at least 6800, 6502, 8080, and Z80. (To some extent 8085, but as an "expanded" 8080 the Z80 dominated.) The four of them powered the most iconic systems at the start of the microprocessor "takeover" at the end of the seventies (at the same time as I entered my electronics education). The 6800 was kind of left behind by the others eventually, but was used in…
Was the 8085 ever used much as a microcomputer CPU? I've seen it as an embedded CPU, but I don't recall it getting much run as a general-purpose CPU.
You could run CP/M on it, of course, but Digital Research didn’t see the point in creating 8085 or Z80 specific versions of CP/M, so they just ran the 8080 version.
Re: Motorola 6800
#76I built a small multitasking kernel with a friend with a 68000 (m68000) in college. We implemented it on breadboards, I think with 30 or so feet of jumpers [0]. I had very little prior embedded experience, so it was trial by fire. It was a wonderful introduction to how kernels work (or at least concurrency and scheduling) at their most basic level, without having to deal with the complexity of virtual address spaces,…
This article refers to the 6800 which isn't the same.
Also, that's a 68008 (with the 'simplified' 8bit data and smaller address bus). Both somebow 8bit :-P
Re: Motorola 6800
#77In college in NZ I wrote a simple compiler for the 6802 with some friends, it fit in 2k (just) .... we called ourselves "uSoft" (with a greek mu - but we were cross-compiling from cards, no room for a mu) .... the next year we heard of some jokers in the US who were using our name, and pffft! they only had a basic interpreter, so lame!
Needless to say the jokers in the US became multi-billionaires, we were stuck on the other side of the world with no one to sell to, and no real knowledge of the marketing we'd need to bring our code to market - if only we'd incorporated we could at least have sold the name :-)
Re: Motorola 6800
#78I built a small multitasking kernel with a friend with a 68000 (m68000) in college. We implemented it on breadboards, I think with 30 or so feet of jumpers [0]. I had very little prior embedded experience, so it was trial by fire. It was a wonderful introduction to how kernels work (or at least concurrency and scheduling) at their most basic level, without having to deal with the complexity of virtual address spaces,…
I built a multi tasking kernel for the 6809, which was an extended version of the 6800 rather than the 68000 series, which is quite a different kind of a CPU. It was fun! Also created a double sided PCB using laser printers and then ironing the layout onto photo etching PCBs.
There was also OS9 (Microware, not Apple). It was very Unix-like, but not fully POSIX, and very poorly documented. After initial development on the 6809, they released a port for 68K.
Re: Motorola 6800
#79Earlier quoted context omitted.
The 6800 definitely is a classic, yes. The classics included at least 6800, 6502, 8080, and Z80. (To some extent 8085, but as an "expanded" 8080 the Z80 dominated.) The four of them powered the most iconic systems at the start of the microprocessor "takeover" at the end of the seventies (at the same time as I entered my electronics education). The 6800 was kind of left behind by the others eventually, but was used in…
Was the 8085 ever used much as a microcomputer CPU? I've seen it as an embedded CPU, but I don't recall it getting much run as a general-purpose CPU.
The 8085 was in the Tandy 100 and 102 computers.
Re: Motorola 6800
#80I'll mention this even though it isn't exactly the Motorola 6800: I've been doing a lot of work recently with the Hitachi 6303, which is a member of Hitachi's family of Motorola 680x alternatives. The Hitachi 6303 is featured in a lot of 80s Japanese synthesisers, particularly Yamaha's DX/TX range. The Motorola 680x series also features in the Ensoniq ESQ family of synthesisers, probably many more.
I became acquainted with this architecture disassembling the Yamaha DX7 firmware: https://github.com/ajxs/yamaha_dx7_rom_disassembly It's a great instruction set to work with. It's my first experience with 8-bit programming, and I found it very intuitive.