Applied Engineering was a leading 3rd party hardware vendor for the Apple II series of computers from about the mid 1980's until the mid 1990's. As Apple Computer began to withdraw support for the Apple II series and focus on the Macintosh, the market for Apple II hardware and software began to wane. Many Apple II users began to migrate. Some went to using PC's and some went to the Macintosh. In an attempt to capitalize on their well known brand name among new Macintosh users who may have owned an Apple II previously, Applied Engineering began to market products to the Macintosh market. Unfortunately, with stiff competition, Applied Engineering could not duplicate the sucess it had experienced with the Apple II and later went out of business.

 Some of Applied Engineering's best known products for the Apple II included: RAMWORKS - Memory Expansion Card for the 8-bit Apple II's Transwarp - Speed Accelerator for the Apple IIGS Vulcan - External Hard Drive PC Transporter - Card that allowed Apple II's to run MS-DOS programs 

The TransWarp family actually consisted of multiple products. Before the TWGS, there was a TransWarp and a TransWarp II for earlier slotted Apple II machines. A TW3 was announced. The original TransWarp overrode the 1MHz 6502 with a 3.6MHz version which could also be run at 1.8MHz (selected by hardware) and turned on or off completely through software.

One later product was the Serial Pro serial Interface card. Besides acting as a general purpose serial port, the card included a ProDOS compatible clock. If used with a dot-matrix printer, the Serial Pro offered several scrren-print variations. It could print either HiRes page (or both in a single dump) normally, or print page one rotated or inverted.