A topic not covered thus far: what happens when the computer is powered up? Dig into writing your own boot ROM/FLASH. Nothing like having to research the variou

A topic not covered thus far: what happens when the computer is powered up? Dig into writing your own boot ROM/FLASH. Nothing like having to research the various CPU registers that require initialization during boot to give you an intimate understanding of what the core of the system is. A project I worked on that was also an interesting challenge was a RAMless monitor ROM. Write a program that will boot up the monitor (not the OS) and provide an interactive console that uses no RAM at all. Commands are to poke or dump RAM, read/write IO ports, probe the bus for devices etc. You can’t use the CALL instruction because you have no stack. Test your code by pulling the RAM modules.