<s>
The	O
HP	B-Device
64000	I-Device
Logic	O
Development	O
System	O
,	O
introduced	O
17	O
September	O
1979	O
,	O
is	O
a	O
tool	O
for	O
developing	O
hardware	O
and	O
software	O
for	O
products	O
based	O
on	O
commercial	O
microprocessors	O
from	O
a	O
variety	O
of	O
manufacturers	O
.	O
</s>
<s>
The	O
systems	O
assisted	O
software	O
development	O
with	O
assemblers	B-Application
and	O
compilers	O
for	O
Pascal	B-Application
and	O
C	B-Language
,	O
provided	O
hardware	O
for	O
in-circuit	B-Application
emulation	I-Application
of	O
processors	O
and	O
memory	O
,	O
had	O
debugging	B-Application
tools	I-Application
including	O
logic	O
analysis	O
hardware	O
,	O
and	O
a	O
programmable	B-General_Concept
read-only	I-General_Concept
memory	I-General_Concept
(	O
PROM	O
)	O
chip	O
programmer	O
.	O
</s>
<s>
When	O
introduced	O
the	O
HP	B-Device
64000	I-Device
had	O
two	O
distinguishing	O
characteristics	O
.	O
</s>
<s>
First	O
,	O
unlike	O
most	O
microprocessor	O
development	O
systems	O
of	O
the	O
day	O
,	O
such	O
as	O
the	O
Intel	B-Device
Intellec	I-Device
and	O
Motorola	O
EXORciser	O
,	O
it	O
was	O
not	O
dedicated	O
to	O
a	O
particular	O
manufacturer	O
's	O
microprocessors	O
,	O
and	O
second	O
,	O
it	O
was	O
designed	O
such	O
that	O
up	O
to	O
six	O
workstations	O
would	O
be	O
connected	O
via	O
the	O
HP-IB	O
(	O
IEEE-488	O
)	O
instrumentation	O
bus	O
to	O
a	O
common	O
hard	O
drive	O
and	O
printer	O
to	O
form	O
a	O
tightly	O
integrated	O
network	O
.	O
</s>
<s>
This	O
workstation	O
used	O
the	O
same	O
custom	O
HP	O
16-bit	O
microprocessor	O
found	O
in	O
the	O
HP	B-Device
9845C	I-Device
workstation	O
.	O
</s>
<s>
It	O
fit	O
the	O
same	O
option	O
cards	O
as	O
the	O
64100A	O
and	O
64110A	O
,	O
and	O
was	O
connected	O
via	O
an	O
IEEE-488	O
bus	O
to	O
a	O
standard	O
HP	B-Device
9000	I-Device
Series	O
300	O
workstation	O
running	O
the	O
HP-UX	B-Application
operating	O
system	O
rather	O
than	O
using	O
a	O
specially	O
designed	O
workstation	O
such	O
as	O
the	O
64100A	O
and	O
64110A	O
.	O
</s>
<s>
There	O
was	O
a	O
generic	O
assembler	B-Application
/	O
linker	B-Application
(	O
)	O
,	O
Pascal	B-Application
compiler	O
(	O
)	O
,	O
and	O
C	B-Language
compiler	O
(	O
)	O
,	O
which	O
were	O
supplemented	O
with	O
add-on	O
cross-assemblers	O
and	O
cross-compilers	B-Application
for	O
each	O
particular	O
microprocessor	O
.	O
</s>
<s>
In	O
addition	O
,	O
there	O
was	O
a	O
Pascal	B-Application
"	O
Host	O
Compiler	O
"	O
,	O
product	O
number	O
64817A	O
,	O
disk	O
image	O
at	O
,	O
which	O
could	O
be	O
used	O
to	O
write	O
programs	O
to	O
execute	O
on	O
the	O
workstation	O
host	O
processor	O
.	O
</s>
<s>
The	O
64000	O
system	O
,	O
through	O
the	O
use	O
of	O
optional	O
cards	O
and	O
software	O
,	O
could	O
perform	O
in-circuit	B-Application
emulation	I-Application
of	O
a	O
variety	O
of	O
microprocessors	O
and	O
their	O
memory	O
.	O
</s>
<s>
The	O
emulation	O
memory	O
could	O
be	O
used	O
to	O
substitute	O
for	O
memory	O
in	O
the	O
user	O
system	O
so	O
that	O
,	O
for	O
instance	O
,	O
user	O
program	O
code	O
could	O
be	O
placed	O
in	O
the	O
emulation	O
memory	O
and	O
executed	O
rather	O
than	O
needing	O
to	O
program	O
ROM	B-Device
chips	I-Device
.	O
</s>
<s>
Depending	O
on	O
the	O
model	O
,	O
the	O
control	O
board	O
might	O
also	O
contain	O
hardware	O
to	O
flag	O
illegal	O
opcodes	B-Language
or	O
memory	O
accesses	O
or	O
to	O
act	O
as	O
an	O
internal	O
logic	O
analyzer	O
.	O
</s>
<s>
Memory	O
Emulation	O
allows	O
RAM	B-Architecture
and/or	O
ROM	B-Device
in	O
the	O
user	O
system	O
to	O
be	O
replaced	O
by	O
memory	O
in	O
the	O
64000	O
system	O
.	O
</s>
<s>
Memory	O
maps	O
for	O
the	O
user	O
system	O
could	O
be	O
specified	O
in	O
terms	O
of	O
RAM	B-Architecture
,	O
ROM	B-Device
and	O
protected	O
memory	O
.	O
</s>
<s>
Attempted	O
writes	O
to	O
ROM	B-Device
or	O
accessing	O
of	O
protected	O
memory	O
was	O
detected	O
by	O
the	O
memory	O
controller	O
and	O
could	O
trigger	O
actions	O
such	O
as	O
program	O
breakpoints	O
.	O
</s>
<s>
Memory	O
cards	O
of	O
various	O
capacities	O
of	O
static	B-Architecture
RAM	I-Architecture
were	O
offered	O
.	O
</s>
<s>
For	O
many	O
microprocessors	O
,	O
an	O
"	O
inverse	O
assembler	B-Application
"	O
was	O
available	O
that	O
would	O
convert	O
values	O
measured	O
on	O
the	O
data	O
bus	O
to	O
Opcodes	B-Language
for	O
the	O
user	O
processor	O
.	O
</s>
<s>
Such	O
analysis	O
could	O
be	O
used	O
to	O
find	O
glitches	B-Error_Name
or	O
verify	O
digital	O
signals	O
had	O
proper	O
timings	O
.	O
</s>
<s>
These	O
tools	O
acted	O
as	O
what	O
are	O
now	O
commonly	O
called	O
debuggers	B-Application
and	O
profilers	O
.	O
</s>
<s>
An	O
emulation	O
of	O
the	O
64100A	O
workstation	O
is	O
part	O
of	O
the	O
MAME	B-Device
(	O
Multiple	B-Device
Arcade	I-Device
Machine	I-Device
Emulator	I-Device
)	O
system	O
,	O
under	O
Manufacturer	O
HP	O
and	O
titled	O
"	O
HP	B-Device
64000	I-Device
"	O
.	O
</s>
