Table of Contents
VGA Expansion for 128KB RAM, 2-board stack (with PS2 interface)
Features
- Plug in existing 128KB RAM socket
- 25.175MHz pixel clock, 60Hz VGA
- 4K dual port RAM for video memory and font lookup tables
- 64-macrocell CPLD, EPM7064SLC44
- 64 columns, 48 rows of 8×8 pixel monochrome text
- Video RAM can be written any time
- PS2 keyboard interface
Design Files
Schematic of RAM base board with PS2 CPLD
Schematic of dual-port VGA board
Gerber photoplots of RAM base board with PS2 CPLD
Gerber photoplots of dual-port VGA board
