6502 CPU schematics

[Chuck Guzis]

> Date: Sat, 08 Mar 2008 00:07:55 -0500
> From: "Roy J. Tellason" 

> 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.

Extremely common in the S-100 world (think Godbout/Compupro, 
Cromemco, etc.).  Bill Godbout may have offered the widest range of 
processor boards from a single manufacturer.  Early on, there were 
6502 S-100 boards, but not very popular.

There were other non S-100 vendors of optional CPU configurations.  
Didn't The Digital Group offer a choice in their boxes?

Cheers,
Chuck