Aox was founded after Michael Aronson graduated from Harvard University with a doctorate in physics; he stayed with the company until 2000, when he incorporated EndPoints Inc. and switched to full-time fabless semiconductor design.

[1] Founded as Aox Associates, the company's first product was MATE, word processing software for Z80- and 8080-based microcomputers running on top of iCOM Peripherals' or Technical Design Labs' floppy disk operating systems.

This add-on board proved fairly popular, as it opened up the IBM PC to a wide variety of productivity software already developed and tested for earlier CP/M machines.

Levandov shifted the company's add-on developments toward the direction of multimedia and teleconferencing, releasing an all-in-one communications card centered around an Analog Devices DSP in 1993.

The card overrides the slower memory on the motherboard while working cooperatively with the 8088, the latter being relegated to handling I/O calls while the 80286 processes application data.

Intended for PC/ATs or compatibles, which ran the Intel 80286, users could enable or disable the card's speedup on the fly through software, without needing to reboot.

To ensure compatibility with the timing dependencies of disk controllers designed around the 80286's clock, the Master 386-16 underclocks its 80386 during floppy seek operations.

The Master 386-20 updates the circuitry of its predecessor to patch a bug discovered by Intel with their 80387 FPU, in which some protected-mode applications (such as Unix) cause the machine to hang after issuing floating-point operations.

Aox changed the form factor of their memory expansion scheme from modules to cards, occupying a slot of the AT's motherboard and connecting to the Master 386-20 via a ribbon cable.

[19] Both versions of the Master 386 received good writeups in InfoWorld, with Tracey Capen detecting no incompatibility with different software packages,[20]: 75  while Stephen Satchell preferred it over Intel's Inboard 386.

[26][27][b] A 33-MHz–based version of the Micro Master 386 was released in September 1989, as was with a sister card specifically for Zenith Data Systems's Z-248 PC compatible.

[33] Developed over the course of two years starting in 1989,[34] Aox released OS/Master, a software package integrating with the Micro Master allowing users to run multiple operating systems simultaneously, in January 1991.