Table of Contents
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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