SpeedCalc 2019 by İlker Fıçıcılar is the enhanced version of the original SpeedCalc 1986. This new version features "Exit to Final III+ Desktop". You can include the SpeedCalc 2019 in the Final III plus cartridge EPROM, run it by selecting from the menu, and turn back to the Final Cartridge III desktop after exiting the SpeedCalc. This integrated approach helps to experience a seamless desktop computer use. I've also prepared other productivity software (EasyScript, terminal software, etc.) with the same "Exit to Desktop" feature. All can be included in the Final III plus cartridge ROM.

Another enhancement is the 2MHz support for the C64 mode of the C128. Commodore 128 owners can enjoy the extra speed. In addition to 25% faster execution, the recalculation is two times faster now.

SpeedCalc 2019 comes in two forms: Cartridge and Normal PRG. You can burn the cartridge version into an 8K EPROM or into EasyFlash, etc. and use it as a plug-and-calculate software.

See this website for original source and more information.