![]() This makes schematic generation a lot easier individual gates can be placed across many different schematic sheets, but still tied back to one discrete footprint. Kicad deals with logic gates in a nifty way each individual gate within an IC package can be placed as a stand-alone symbol. Most 74-series logic chips are contained in the default Kicad library. There are some things that I’m still getting used to, like proper library setup and library maintenance, but for the most part it has been a tolerable transition from Eagle PCB.īy using Kicad for the schematic and board design, I’ll be able to meet the long-term intent of releasing the Retro-CGA design as open-source. Schematic Build-up:įollowing the design of a POST card, I’ve managed to get quite comfortable with the Kicad software package for schematic design and board generation. I’ll continue using these schematics for inspiration, somewhat apprehensive in the knowledge that I’ll need to tackle any issues as they arise. It is likely that many aspects of these schematics will need to be adjusted to work with modern ICs, or to eliminate accidental mistakes that may have been introduced when they were first published. External link to pdf here (page 32 onward).Īlthough these schematics are a good starting point, I have no idea if they are accurate or relevant to the CGA design that would be representative of the card that I have repaired. Searching for inspiration for the Retro-CGA design, I came across the schematics contained in the “IBM Color/Graphics Monitor Adapter” chapter of the IBM Personal Computer Hardware Reference Library. The first step in this process is the production of a schematic. In what I presume will take months of effort, let’s launch into the design of the “Retro-CGA”. ![]() ![]() In this post I will share the progress I’ve made on undertaking that journey, using the various guiding principles discussed in the initial post. In one of my last posts I pondered the journey required to create an open-source video card inspired by the CGA card that I had repaired, in an attempt to preserve its historically-significant legacy. ![]()
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