just because something is not on the web doesn't mean that it
does not or can not exist.

"Please look at the Zilog web.
Zilog itself announced never the Z80 core
for microcontrollers. "

reference-z84c15,z80180,z80280,z84013/c13,z84015/c15,from
their super integration products (embedded controllers).

there is/was nothing technical stopping the big boys from cutting
deals with each other to make it so.(that is a z80 core or better)

and further,my statement was/is that the aduc812 would be a
better part if it had a z80 core rather than a 8052.my position
is not arrived at quickly or haphazardly.

put it this way-if the 805x had (directly) the following

conditional calls-(on zero as well as /zero,parity,sign)
conditional jumps-'' '' '' ''
at least 2 16 bit register pairs (that could be used as index also)
(with the arithmetics to go along with them)
restart instructions
no distinction between code/data memory (or be able to run in ram)
better interrupt structure
had correct design (hardware) to eliminate the requirement to have
high at the port to read (or the instructions that do just that)
more options on jump
have the limit on "conditional" jumps that do exist not be limited
to relative.
better stack operations.....etc....

than my position on this might not be that it is-the aduc812 would
be a better part with a z80 core.

oh let me get this straight--you (any) would reject having--

lcall z,abcd
lcall /z,abcd
sbc hl,de
ljnc abcd

and so forth..

again the 812 is nice no matter what micro---only because of
adi use of the 8052 was it for me to learn this one also,and
after doing so "my conclusion is" correct.

as for the---

"you don't understand---your own instruction sequences with
the following bytes (after the restart) as variables or
whatever..kinda like a macro but not really... "

Yes, I understand absolutely not, what this mean. Sorry. "


a lot of times after finding the same sequence of code,figured out
a way to use the " restart" instruction to facilitate this series--

example:
.
.
.
rst 10h
db xx ---this byte is used to define further rst 10
next instruction
.
.

and what happens at rst 10h/xx

push af
push hl
push de
push bc


and at rst 10h/xy


pop bc
pop de
pop hl
pop af


or whatever you want to do----but the code is only
written once in the rom.

the z80 is better.