PolyModular Standards

[Martin Czech]

>     Also in my junk box there is a 65802, a WDC chip.  This was the 16 bit
> version (like the 65816, also by WDC) but with an 8 bit data bus and 16 bit
> address bus, that was a plug in compatable for the 6502.  (actually, I am not
> sure about the two above part numbers, but generally my memory does not fail me
> on such things).  Also, as I recall, it was a 4 MHz part.  Are those parts still
> availiable, or are they long gone like so many other good chips?
> 
>     -Jim
> 

AFAIK there are minor changes from the 65802 to the 65C02 functionality
(in 8 bit emulation mode). But there is a difference, I can't remember
now what it was. Maybe it is only the timing..., a yes, db may have
a shorter hold time then 65C02. There are other little differences,
we had some redesigns due to this.

So be carefull !

I think that the 16-Bit version is not very usefull, multiplexed busses
(?is this still the case if you buy a chip, not embedded?), 8 bit data
bus. It makes C-compilation easier, that's true.

But I think for our purposes you would program machine language anyway.

m.c.