17 Nov
2007
17 Nov
'07
10:16 p.m.
We've been here before. The IBM color display as
well as the EGA
version contains a PROM to correct the "dark yellow" color to brown.
Minor correction. While the 5154 EGA monitor uses a PROM for this, the
5153 CGA monitor does it all in simple TTL chips (including wire-ANDed
open-collector stuff)
It was duplicated on few, if any third-party units.
Perhaops I only deal with the better units, but the Philips service
manual I've just looked at gets it right, and the very nice Trinitron
TTL/analogue monitor that I use with Beebs and Torch XXXes has the
circuitry too.
-tony