Video monitors designed to operate from old PC standards such as EGA or CGA have become expensive and difficult to source; they are also not future upgrade compatible.

The problem is due to the low frequency of their horizontal deflection or scanning system. The C.A. Designs scan doubler SCAN2 reads the original video signals into solid state memory at the original frequency and, almost simultaneously, writes this signal out again at twice the rate. The output signal is processed to be made compatible with standard, low cost and easily available monitors used with current PCs.

The SCAN2 module connects directly with a computer terminal via a 9-way D male to 9-way D female lead.

• Video Input
  accepts EGA (default) or CGA signals

 
• Video Output
  via 15-way high-density D female socket

 
• Power Supply
  9 to 12v external PSU on a DC coaxial connector with centre pin positive

The standard units are programmed with default parameters suitable for an EGA input with a typical PC monitor output.

They also have a range of manual adjustments to modify the signal capture and picture position. These adjustments are made with a standard PC keyboard (PS/2 style).

Adjustments made are stored in non-volatile memory and are retained when power is off (default settings can be restored if required).

• Application Notes (53Kb)
  Prototype application notes in Adobe Acrobat (*.PDF) format, suitable for offline viewing and printing