Quoted from Noob78:Here is a picture of the extra rom that came with the machine. The person I bought it from said the person he bought it from gave it to him couldn’t remember why.
[quoted image]
That's a 1Mb eprom, and the CPU rom is the only 1Mb chip in the set. I wouldn't be surprised if that was the original CPU rom for the machine. The CPU chip was the only one to change between version 1.01 and 1.03, so it was a one-chip upgrade. To see what it is, you can either dump the data from that chip (requires an eprom burner or similar) or just plug it in to socket U210 and see what happens when you boot the machine.