8088 vs. 80c88

[Chuck Guzis]

On 20 Feb 2009 at 18:59, Jim Leonard wrote:

> I have never found a decent resource on NEC V20 special opcode 
> programming; the only stuff I've found has been on how to detect an NEC 
> through bugs, and searching via google has been unproductive for the 
> last 20 minutes.  Is there a resource for what the extended instructions 
> were, or is that lost to paper history?

Dunno--my reference is "uPD70108/70116 Low-Power CMOS Microprocessors 
User/s Manual" August 1985, Stock No. 500350.  Sort of a strange read 
if you're used to Intel terminology, as NEC uses their own.  For 
example, the register names are different (AW,BW,CW,DW,IX,IY; PS, 
DS0, DS1, SS) and mnemoics are different--e.g., Intel AAM is called 
CVTBD (convert bindary to decimal).  Just enough difference to make 
you think that NEC rewrote the Intel manual in Frisian.

There's also a V-Series general reference namual that describes all 
of the members of the V-family, but not in any great detail.

Cheers,
Chuck