The SX dies were manufactured[citation needed] by UbiCom, who sent them to Parallax for packaging.
On July 31, 2009, Parallax announced that the SX line had reached its production EOL (End-of-Life) as Ubicom would no longer be manufacturing dies based on the designs; after the supplies from the final "lifetime buy" have been exhausted, the associated products cannot be restocked.
While Parallax's SX micros are limited in variety, their high-speed and additional resources allow programmers to create 'virtual devices', including complete video controllers, as required.
For example, there are software library modules to emulate I2C and SPI interfaces, UARTs, frequency generators, measurement counters and PWM and sigma-delta A/D converters.
If you are running on the Microsoft Windows platform, you would want to grab a copy of the SX Key software from Parallax's website.
[4] This software is officially supported by Parallax, and they have a partnership to work together on making the SX/C compiler a first class citizen.
Note, it is still in its infancy, and while it produces proper hex files to be programmed, it has its rough edges and limitations.
SX Key Software has been reported to work well under Wine (a Windows compatibility layer for Linux platforms).