Epson QX-10

The Epson QX-10 is a microcomputer running CP/M or TPM-III (CP/M-80 compatible) which was introduced in 1983. It was based on a Zilog Z80 microprocessor, running at 4 MHz, provided up to 256K of RAM organized in four switchable banks, and included a separate graphics processor chip (µPD7220) manufactured by NEC to provide advanced graphics capabilities. In the USA, two versions were launched; a basic CP/M configuration with 64 K RAM and the HASCI configuration with 256 K RAM and the special HASCI keyboard to be used with the bundled application suite, called Valdocs. The European and Japanese versions were like the CP/M configurations. TPM-III was used for Valdocs and some copy protected programs like Logo Professor.