I will try to find a vendor or two that still makes them (this will be tough). If you do want to use a core logic chip, let me know. If you really want to roll your own, I will try to pull out some of my old stuff to help you out. Remember, you need RAM, boot ROM, and some sort of ISA bridge as a minimum. This is considered to be medium to very complex depending upon the amount of functionallity that you want to add. Since I saw that you did not want to really use any external chips (north bridge or core logic) then your only option is to roll your own core logic. If you are not familiar with the ISA bus, then see the PC104 page. The ISA bus is then connected to the 82c206. Typically this is the SDRAM controller (for 486, it probably will be EDO or FP DRAM) and an ISA bus. The core logic converts the processor bus to a set of high speed peripherals that the processor needs to run. Todays terminology is the North and South Bridges (and use PCI for connection between north and south bridges). They used to be referred to as the core logic chips and the I/O peripheral chips. In a system, there are two types of chips that connect the processor to the standard PC peripheral set. First, what you are missing is the core logic bridge.
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