Has anyone out there managed to load a PLATO PHM 3122 cartridge by Control Data into the JS99'er emulator?

That way a user could place all of the PLATO Lesson Disks on a cloud location (e.g., OneDrive) and have access to one of the better home computer teaching & review applications that was ever available for a stand-alone home computer!

Having access to a TI99/4A emulator through the internet may be a unique method of re-introducing the more than 3,000,000 original TI99/4A purchasers and users to a beloved retro home computer!

Discussing its availability on social media like Facebook could go a long way towards its revival.

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    If you are just interested in running PLATO, on cyber1 there is an emulation of the original system by Control Data (not Ti-99 based, and older than the Ti-99).
    – dirkt
    Aug 17, 2016 at 6:09
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    And if you are interested in emulating PLATO on a Ti-99, it looks like it's emuated by MAME (which is not JS99, so again not your question...)
    – dirkt
    Aug 17, 2016 at 6:10

1 Answer 1


There is a lot of activity around PLATO in the retro-computer scene lately thanks to one particular person, Thom, who has been porting a PLATO terminal to many retro computers including the 99/4A. He has a website with status for all the systems: https://www.irata.online/

As for running PLATO itself on js99er specifically, I see the original PLATO cartridge in js99er's software list and I just loaded it without problems. If you have trouble with js99er, the author of the emulator is a very active member of the TI-99/4A subforum of the AgariAge forums.

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