 Quote by pairofstrings
First, I want to buy a single core processor ...
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If this doesn't have to be a PC, you might consider buying a hobby type single board computer that uses an Intel 8088 or 8086.
The monitor is driven by a graphics card. You can use an LCD monitor if it works with VGA output.
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switched-mode Power supply
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How the power supply works doesn't matter.
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I have my home-assembled computer ready.
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You should be able to by a pre-built hobbyist type single board computer.
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have to switch between banks of video card to display text message
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You have to switch between banks of memory to access all of the video card's memory even when in graphics mode.
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Do you think I definitely need to include video card in my set up? CRT circuitry
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A monitor connects to a video card, not directly to a computer. You need a video card.
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does Matlab software developer guys knows the interface of video card?
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No, the program probably uses the direct x interface which is part of the video card driver that is installed into windows. The bios is not used.
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I still want to learn pure assembly language.
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It would be a lot easier to buy a hobby project board that just includes a processor and something like a small LCD display chip. I did a web search for "hobby single board project computer" and found a few hobby type boards. I would avoid the ones you have to wire up yourself.
If the goal is to learn pure assembly language, then why not start with some simple programs that run under a dos console window, using the standard c libraries to input from keyboard and output to video card? The point here is to learn assembly language programming in general, instead of learning to write device drivers.