<s>
The	O
Intel	B-General_Concept
4040	I-General_Concept
microprocessor	B-Architecture
was	O
the	O
successor	O
to	O
the	O
Intel	B-General_Concept
4004	I-General_Concept
.	O
</s>
<s>
The	O
4040	O
employed	O
a	O
10	O
μm	O
silicon	O
gate	O
enhancement	O
load	O
PMOS	B-Algorithm
technology	O
,	O
was	O
made	O
up	O
of	O
3,000	O
transistors	O
and	O
could	O
execute	O
approximately	O
62,000	O
instructions	O
per	O
second	O
.	O
</s>
<s>
General	O
performance	O
,	O
bus	O
layout	O
and	O
instruction	O
set	O
was	O
identical	O
to	O
the	O
4004	B-General_Concept
,	O
with	O
the	O
main	O
improvements	O
being	O
in	O
the	O
addition	O
of	O
extra	O
lines	O
and	O
instructions	O
to	O
recognise	O
and	O
service	O
interrupts	B-Application
and	O
hardware	O
Halt/Stop	O
commands	O
(	O
the	O
latter	O
allowing	O
operator-controlled	O
single-stepping	O
for	O
debugging	O
purposes	O
)	O
,	O
an	O
extended	O
internal	O
stack	O
and	O
general-purpose	O
"	O
Index	O
"	O
register	O
space	O
to	O
handle	O
nesting	O
of	O
several	O
subroutines	O
and/or	O
interrupts	B-Application
,	O
plus	O
a	O
doubling	O
of	O
program	O
ROM	B-Device
address	O
range	O
.	O
</s>
<s>
According	O
to	O
Byte	O
magazine	O
,	O
the	O
first	O
microcomputer	O
designed	O
around	O
the	O
Intel	B-General_Concept
4040	I-General_Concept
was	O
the	O
Micro	O
440	O
,	O
released	O
by	O
Comp-Sultants	O
of	O
Huntsville	O
,	O
Alabama	O
,	O
in	O
1975	O
.	O
</s>
