The Z64 consists of an special 386 personal computer with 40Mhz and 512k Ram. It runs a free dos version. It has the ability to program a 32Mb simm. The 32Mb simm is not available as RAM to the 386 PC. The rom files will be loaded into this RAM.
The display is a 20x2 LCD screen with background lightning.
The drive is a standard IDE Zip drive, which can also be used with a PC.
The bios chip is a 5V 4Mbit 150 ns flash EEPROM in a 32PIN DIP socket, you can use the 28SF040 from SST as a replacement.
It also has an unused ISA port.