Replica IBM 5150 PC motherboard

On Thu, 8 Mar 2018, Ali wrote: Not much to tell, and I don't know much. I think that it was Todd Fischer. He supplied a ROM, and a serial board that was hard configured for a terminal (can't run software to configure a serial card if the machine won't boot!). It therefore did not rely on the video working. He also had been selling cases and power supplies for 5.25" drives at the conputer swaps. I really enjoyed the P.O.S.T. cards. In debugging code, I could insert a simple output to a port of the value of a variable, with minimal disruption of any of the rest of the code. A friend pointed out that most diagnostic software, including many memory tests, etc. would not run if there actually WAS a fault, such as bad RAM in Bank0. So, as a joke, he wrote a "DIAGNOSTIC PROGRAM", that put "It works!" on the screen. "If you get the message, then it means that everything is at least sorta working. If you do not get the message, then something is wrong." Later, he changed it to "friendlier message", and had it say, "Hello, world".