<s>
Currah	B-Application
was	O
a	O
British	O
computer	O
peripheral	O
manufacturer	O
,	O
famous	O
mainly	O
for	O
the	O
speech	B-Application
synthesis	I-Application
ROM	B-Protocol
cartridges	I-Protocol
it	O
designed	O
for	O
the	O
ZX	B-Operating_System
Spectrum	I-Operating_System
,	O
Commodore	O
64	O
,	O
and	O
other	O
8-bit	O
home	O
computers	O
of	O
the	O
1980s	O
.	O
</s>
<s>
Currah	B-Application
μSource	O
from	O
Quadhouse	O
.	O
</s>
<s>
In	O
a	O
self-contained	O
ROM	B-Protocol
cartridge	I-Protocol
it	O
has	O
a	O
full-function-two-pass	O
macro	O
assembler	O
,	O
Forth	O
and	O
a	O
debugger	O
,	O
all	O
of	O
which	O
can	O
interact	O
with	O
Basic	O
.	O
</s>
<s>
It	O
is	O
also	O
compatible	O
with	O
Interface	B-General_Concept
1	O
.	O
</s>
<s>
The	O
Currah	B-Application
μSpeech	O
,	O
commonly	O
referred	O
to	O
as	O
the	O
Microspeech	O
plugged	O
into	O
the	O
expansion	B-Device
port	I-Device
on	O
the	O
back	O
of	O
the	O
ZX	B-Operating_System
Spectrum	I-Operating_System
.	O
</s>
<s>
The	O
unit	O
contained	O
a	O
ULA	O
which	O
worked	O
on	O
a	O
WRITE	O
command	O
from	O
the	O
microprocessor	O
,	O
a	O
ROM	B-Device
containing	O
the	O
keyword	O
speech	O
patterns	O
,	O
and	O
an	O
SP0256-AL2	B-Application
speech	O
processor	O
.	O
</s>
<s>
For	O
cost	O
reasons	O
,	O
the	O
unit	O
did	O
not	O
provide	O
for	O
daisy-chaining	B-Application
of	O
further	O
devices	O
on	O
the	O
computer	O
's	O
expansion	B-Device
port	I-Device
.	O
</s>
<s>
Many	O
joystick	B-Device
interface	B-General_Concept
manufacturers	O
took	O
the	O
same	O
approach	O
,	O
meaning	O
that	O
you	O
could	O
not	O
have	O
a	O
joystick	B-Device
and	O
the	O
MicroSpeech	O
unit	O
plugged	O
in	O
at	O
the	O
same	O
time	O
.	O
</s>
<s>
Currah	B-Application
was	O
acquired	O
by	O
DK'Tronics	B-Application
in	O
1985	O
.	O
</s>
<s>
DK'Tronics	B-Application
continued	O
to	O
manufacture	O
the	O
MicroSpeech	O
unit	O
,	O
and	O
many	O
of	O
their	O
software	O
titles	O
(	O
such	O
as	O
Maziacs	B-Application
and	O
Zig	O
Zag	O
)	O
supported	O
it	O
.	O
</s>
