There is a plaque with hex dump at the entrance of Computer History Museum in Mountain View, California. I immediately recognized the opcodes on it because I k

There is a plaque with hex dump at the entrance of Computer History Museum in Mountain View, California. I immediately recognized the opcodes on it because I knew Z80 and they were in 8080 (I don't remember seeing any ED B0 or similar Z80 extensions). 01, 11, 21, C3 and CD’s all over. I think it was either a boot loader or a BASIC ROM startup code, but not sure. 8080 probably implies Altair BASIC because there was “(C) MICROSOFT” string in the code.