This family of microcontrollers was the forerunner of the ubiquitous 8051 series. Small and simple, and offering on-board EPROM, RAM, timer, and I/O, they were great for quick control projects. Their sisters, the UPI-41 series, were easy to interface to the ISA bus.
Between 1987 and 1997 I used them both at work and in hobbies with my friend, Lance. The 8741s provided PCs with rotary encoder inputs, stepper controls, MIDI outputs, and laser scanner controls. The 8748s were for stand-alone devices like a MIDI keyboard and an LCD timer. My favorite project was a digital tuner with alphanumeric LEDs and 124 station database for my aircraft radio.