I have wondered if the Intel 8051's ROM is an MROM or if it is a form of PROM. If it is a form of PROM, there should be a way to copy the SDS1000 source code onto an unblown, new-old-stock 8051 if I can get a hold of a PROM/ERPROM blower that I wouldn't need an old computer for. As for an MROM, there would be nothing I could do about replacing the SDS1000's 8051 if it gets damaged because MROMs are physically assembled by the factory.