<s>
MDOS	O
(	O
short	O
for	O
Myarc	B-Operating_System
Disk	I-Operating_System
Operating	I-Operating_System
System	I-Operating_System
)	O
is	O
an	O
operating	B-General_Concept
system	I-General_Concept
commercialized	O
by	O
Myarc	O
.	O
</s>
<s>
It	O
was	O
designed	O
and	O
implemented	O
specifically	O
for	O
the	O
Geneve	B-Device
9640	I-Device
by	O
Paul	O
Charlton	O
.	O
</s>
<s>
MDOS	O
was	O
designed	O
to	O
fully	O
emulate	O
the	O
TI-99/4A	B-Device
computer	O
while	O
providing	O
an	O
advanced	O
(	O
for	O
its	O
time	O
)	O
virtual	O
memory	O
operating	O
environment	O
with	O
full	O
support	O
for	O
mouse	O
,	O
GUI	B-Application
,	O
and	O
complex	O
mathematical	O
applications	O
.	O
</s>
<s>
In	O
1993	O
,	O
Beery	O
Miller	O
the	O
publisher	O
of	O
9640	O
News	O
,	O
organized	O
a	O
group	O
of	O
Geneve	B-Device
9640	I-Device
owners	O
and	O
was	O
able	O
to	O
purchase	O
all	O
rights	O
to	O
the	O
source	O
code	O
for	O
MDOS	O
,	O
Advanced	O
Basic	O
,	O
the	O
PSYSTEM	O
runtime	O
module	O
,	O
and	O
the	O
GPL	O
Interpreter	O
from	O
Myarc	O
and	O
Paul	O
Charlton	O
.	O
</s>
<s>
Support	O
adding	O
SCSI	B-Architecture
,	O
IDE	B-Protocol
,	O
and	O
larger	O
ramdisks	B-Application
were	O
added	O
in	O
the	O
earlier	O
years	O
from	O
the	O
buyout	O
.	O
</s>
<s>
In	O
late	O
2020	O
and	O
early	O
2021	O
with	O
the	O
release	O
of	O
the	O
TIPI	O
for	O
the	O
TI-99/4A	B-Device
,	O
the	O
Geneve	O
was	O
interfaced	O
with	O
the	O
TIPI	O
and	O
a	O
Raspberry	B-Operating_System
Pi	I-Operating_System
providing	O
TCP	B-Protocol
socket	I-Protocol
access	O
and	O
nearly	O
unlimited	O
high	O
speed	O
hard-drive	O
like	O
file	O
access	O
.	O
</s>
<s>
MDOS	O
was	O
written	O
specifically	O
for	O
the	O
TMS9995	O
16-bit	O
CPU	O
and	O
the	O
Yamaha	B-General_Concept
V9938	I-General_Concept
video	O
display	O
processor	O
.	O
</s>
<s>
All	O
source	O
code	O
for	O
the	O
Geneve	B-Device
9640	I-Device
is	O
in	O
the	O
public	O
domain	O
.	O
</s>
