6502 CPU schematics

[Roy J. Tellason]

On Friday 07 March 2008 17:34, Tony Duell wrote:
> > Thinking back a homebrew computer ( with a change in the cpu card) was
> > in BYTE a 6800 or a 6502 machine.
>
> The 6800 and 6502 buses are indeed very similar, so this does not suprise
> me at all.
>
> I think the UK-designed Tangerine machine had a CPU card with overlapping
> 40 pin IC pads for either a 6800 or a 6502 (you had to change the monitor
> ROMs as well, of course).

Which reminds me,  does anybody else remember those machines that had multiple 
CPUs in them?  Or the option of plugging different ones in?  Seems to me real 
early on there were some mfrs trying to find as much compatibility as they 
could with pursuing options like that.  I remember one Taiwanese-made clone 
of an Apple II that had a Z80 on the main board,  and of course the c128 has 
that similar setup (though the way the hardware was structured the z80 
effectively ran at something like 2.5MHz).  I remember some other system 
where you could literally plug in different processors for different uses,  
but the brand name isn't coming to mind at the moment.

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin