<  Well, the 750 is implemented with a metric buttload of custom LSI
<chips...and the 730 is based on an array of AMD 2901 bit-slice
<microprocessors and an LSI microsequencer of some kind; maybe a 2910.
<With such a difference in low-level implementation, there are lots of
<little things that can be quite different.

Not really as the VAX series has to meet DECstd mumble for VAX archecture.
The major ifferent is performance and that the 730 did have limited 
microcode store due to the 29xx base.  Emulation (via software trap) of 
some instruction was to save micro code for some of the complex instruction 
types that could be emulated in vax code nearly as fast.

Also there is a C program on the net that emulates a tu58.  It has some 
limitations due to implmentation and emulation hardware differences.


Allison