Version 2 of the 8-bit computer represents a number of improvements made since the release of version 1. Most notably:

• Timing issues have been resolved, enabling a clock frequency jump from 7 kHz to 1,500 kHz (1.5 MHz)
• Memory has been expanded from 128K of RAM (64K x 16 address space) to 1024K of RAM and 1024K of flash (1024K x 16 address space)
• A VGA-compatible, 80x60 character color video board has been added. This is a separate unit and is documented here.
• A Z-Machine has been written, enabling users to play a wide range of text adventure games.

(full size)

(Note that the above photograph is a bit out-of-date and does not include the memory expansion nor the addition of a crystal oscillator for the clock).

Schematics

• schematic-v2-revA.pdf: Schematic diagrams for the main computer board
• kicad/: KiCad files for this schematic
• [TODO: schematics for I/O expansion: keyboard buffer, LCD, and hardware timer]

Other documentation

[TODO]

Software

See ../software/.