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|cname = CTSS-tan
|cname = CTSS-tan
|alias = Compatible Time-Sharing System
|alias = Compatible Time-Sharing System
|hname = Tessa Corbato
|hname = Tessa Corbató
|debut = Dec 2007
|height = 168 cm (5'6")
|height = 168 cm (5'6")
|haircolor= dark red
|haircolor= Dark red
|eyecolor= dark red
|eyecolor= Red/blue
|weapon = Yet-unknown, may involve fire
|weapon = N/A
|apfaction = [[MIT Society]] and loosely associated with the IBMs.
|apfaction = [[MIT Society]]
|lineage= MIT- direct descendant of Whirlwind
|lineage= MIT
|rival= N/A
|rival= N/A
|debut = Dec 2007, overhauled 2025<ref>[https://www.ostan-collections.net/forum/index.php/topic,1817.msg177088.html#msg177088 More IBM-tans]</ref>
|creator = Bella
|continuity = OS-tan Collections


|osper = Compatible Time-Sharing System
|osper = Compatible Time-Sharing System
|osdev = MIT
|osdev = MIT
|reldate = 1961
|reldate = Nov. 1961
|lastrel = unknown, discontinued by 1973
|lastrel = unknown, discontinued by 1973
}}
}}


==Technical details==
==Technical details==
The [[wikipedia: Compatible_Time-Sharing_System| Compatible Timesharing System]], released 1961, is a small timesharing system built for the [[wikipedia: IBM_7094 | IBM 7094 computer]]. One of the first timesharing operating systems, it was developed by the Massachusetts Institute of Technology Computation Center. It's worth noting that the “Compatible” in CTSS' name refers to an earlier IBM OS, Fortran Monitor Program, which CTSS virtualized in order to complete batch processes.  
Developed by the MIT Computation Center and initially released in 1961, the [[wikipedia: Compatible_Time-Sharing_System| Compatible Timesharing System]] was the first general purpose timesharing OS.
 
While it was only in use for twelve years across two installations (both on the MIT campus) CTSS heavily influenced the design of other early timesharing OSes. It debuted a number of modern operating system features, and multiple notable programs.  


While it had a short lifespan of twelve years and was only installed in two sites (both on the MIT campus) CTSS proved to be prolific; it influenced most timesharing systems to come, most notably CP/CMS, TSS/360 and [[Multics | Multics]] – the latter a direct descendant, built on and hosted by CTSS machines until it was self-functioning.
CTSS became usable under emulation as of 2010.
The source code of CTSS was made open and freely available in 2004. In August of 2010, an operational 7094 emulator capable of running a functioning CTSS system was released.


==Character details==
==Character details==
===General===
===Physical===
CTSS-tan is depicted as a mature woman with wavy dark red hair, dark red eyes and small oval glasses. A sinophile, she dresses in Chinese-inspired Victorian-style clothing and partakes in Chinese cultural activities. She dresses simply and elegantly, reflecting the sensible nature of the system. Her mother is [[Whirlwind | Whirlwind]], and has two sisters who both outlived her: [[SAGE | SAGE]] and [[PDP-1 | PDP 1]]. She stands out as the only OS-tan in a family of hardware and hybrid -tans.  
CTSS-tan is depicted as a woman in her 30s, average height with light olive skin, long dark red hair, red and blue eyes and thick oval glasses. Her travels have given her an appreciation for a wide variety of cultures, which she incorporates into her personal style,<ref>Had remote users in multiple countries.</ref> with long sleeve qipao-style dresses a favorite of hers. She favors the colors red and blue.<ref>Referencing the Computation Center "Blue Machine" (IBM 7090, later 7094) and Project MAC "Red Machine" (IBM 7090).</ref>
 
She has low vision and can read & write braille.<ref>CTSS was used for early computer braille translation & typesetting.</ref>
 
She speaks with a slight Bostonian accent.
 
==Personality==
A career academic, CTSS-tan is forward-thinking and hardworking, but modest about her accomplishments.
 
CTSS-tan is great at multitasking and can communicating with groups. She is good at understanding different perspectives, endearing her to both older and contemporary OS-tans.<ref>Compatible with older batch processing systems.</ref>
 
She is a good mediator and lends a sympathetic ear to humans and computers alike, and while she gladly issues advice she pushes back gently on her reputation as "therapist". Because of her social experience, she comes off as an average human to those who aren't aware of her true nature. <ref>Hosted the Rogerian therapist chatbot and early Turing Test contender ELIZA.</ref>
 
Despite her talkative nature she's good at keeping secrets and dislikes gossip. <ref>First implementation of computer passwords.</ref>


CTSS is quiet and reserved, traits sometimes mistaken for emotional distance or coldness. In reality she is actually quite kind and caring especially toward her “kids” and students. She considered Multics her child and took care of her when she was too young, and sick, to care for herself; one of her greatest achievements in life was raising her into healthy adulthood (and furthermore securing an heir).
Can have a hot temper but is generally good at moderating it.


===Alternate character interpretation===
==Powers==
She is usually portrayed as a deceased character. Seeing that CTSS was Open Sourced and can now be used in emulators, another interpretation is that she was resurrected, but if so, her whereabouts haven't been discussed yet.
CTSS-tan possesses the power to be multiple places at once, the first OS-tan to have such. She is reluctant to discuss it, playing it off as good timing to those who aren't in the know.


==History and background==
==History and background==
Along with Multics, CTSS also taught many young timesharing OS-tans of the day, including [[CPCMS | CP/CMS]], [[TSS360 | TSS/360]] and [[ITS | ITS]]. It is unknown how she feels about her most famous descendant, [[UNIX | Unix]], as the two never had an opportunity to meet; but has been speculated that she would have looked upon her simple granddaughter favourably.  
CTSS-tan was born in Cambridge, Massachusetts in 1961. She traces part of her ancestry to the IBM 709 line, and part to [[Whirlwind | Whirlwind-tan]], who inspired her creation. While she is aware of her IBM kin and respects her grandmother [[IAS | IAS-tan]]<ref>Early OS for the 709, later 7090/94, which traces back to the 701, a commercialized IAS.</ref>, she takes strongly after Whirlwind-tan, whom she regards as her mother. CTSS-tan vowed to learn from both from Whirlwind-tan's successes and mistakes,<ref>CTSS programmers got their start on Whirlwind, saw the need for a way to handle multiple users & jobs.</ref> surpassing the limitations that she faced as an early hardware-tan while inheriting her restless curiosity, optimism and hard work ethic.


While technically an IBM-tan, CTSS had no allegiance to the empire, scorning them for the academic intelligentsia of MIT. The only IBM-tans she regularly worked with, and had affection for, are FMP-tan – her assistant – and CP/CMS, one of her students.  
CTSS-tan found employment as a librarian, translator and typesetter, working both at home and overseas. While accompanied by the typical coterie of an mainframe-tan of her time, she worked most closely with [[Selectric | Selectric-kun]]. Atypically for an IBM, she was good terms with the early DEC-tans, and even employed [[PDP-7 | PDP-7-tan]].<ref>[https://gunkies.org/wiki/Compatible_Time-Sharing_System#Graphics The "Kludge Display" was controlled with a PDP-7]</ref>


CTSS never left Cambridge, Massachusetts and largely ignored the outside world. She had a few outsider friends however, most notably [[DTSS | DTSS-tan]]. While CTSS' short life ended in 1973, her legacy lives on to this day and has no end in sight.  
A few years after her debut her first child, [[Multics | Multics-tan]], was born. CTSS-tan personally attended to raising her, a full time job given Multics-tan's fragile health. Later, [[CPCMS | CP/CMS]]-tan, whose robustness warranted less involvement. Besides her children, CTSS-tan tutored a generation of timesharing OS-tans. [[ITS | ITS-tan]] among them, although she rebelled against her mentor's teachings and carved her own path.


Since CTSS became Open Source in 2004, and at least one emulator already being developed, it's possible she could be completely resurrected.
CTSS-tan regarded [[UNIX | Unix-tan]] highly despite Multics-tan's fraught relationship with her, and disapproved of the fighting between the two, though she was powerless to stop it.


Though she was in seemingly good health until the end of her life, she passed away suddenly in the early 1970s.
==Theories and Notes==
* May have been revived in modern times.<ref>Can be run under emulation.</ref>
* May be acquaintances with EDSAC-tan.<ref>Maurice Wilkes inspired to write the Atlas  Supervisor after encountering CTSS on a trip to MIT.</ref>


==References==
[[Category:Historical]]
[[Category:Historical]]
[[Category:Open Source]]
[[Category:Open Source]]
[[Category:Mainframe]]
[[Category:Mainframe]]
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