ZX97 © 1997 Rigter.
The ZX97 is a discrete logic clone of the ZX81. It is functionally equivalent and 100% compatible but has numerous enhancements over the original ZX81. The all CMOS design draws only 50mA and can be easily powered from a small battery.
The total memory is increased from 9K to a 192K including 32K of EPROM and 160K of battery backed up SRAM. A SHADOW RAM feature allows users to enhance or replace the ZX81 operating system with the ZX80, FORTH or any other OS software.
The 16 parallel bi-directional I/O lines are connected to an IBM compatible printer port (LPT1) and can also be used for high speed communication with a PC or for robotics applications.
Aside from the existing ZX81 screen text and graphics, the ZX97 offers a full 128 upper and lowercase text characters and unlimited user defined graphics (UDG) And finally, the ZX97 supports both pseudo hires and true bitmapped graphics (192x256) programs.
Machine's bios.
Machine's picture.