Have you ever seen this input source code from bare metal 46 years ago?

I don't know if you know anything about "Hand dial 13"? I n fact, it is thirteen machine instructions. B efore 1985, the use of DJS100 series of old computers, are inseparable from the "hand dial 13." This kind of old computer, if not powered on, they are without any programs, that is, "bare metal".

When the host is turned on, the system programmer will use the panel to manually dial in thirteen machine instructions. A fter that, the SOS/RTOS/tape input machine and other operating systems are booted into memory. O nce this is done, the old computer is controlled by the console. W hen the disk machine appears, the RTOS operating system used is introduced. H owever, before the system can be installed on disk, you will need to use a hand dial Thirteen. A fter the RDOS operating system is installed, each time the power is turned on, the old computer has to dial 2 machine instructions. Only after the operating system is started is the party managed by the console.

Confessed so much, these are the background. D o not know you on the old computer's "hand dial 13" program, do you know? Below, share the source code of thirteen hand dials, or annotated.

This is the 1970s, the emergence of small machines in our country, called DJS-130. A t that time, it was a very advanced machine. T his kind of machine, there is no BIOS. I n order to boot into the system with the terminal operation, you need to dial the switch by hand, the above 13 instructions into. The switch is underneath and requires one bit of write memory.

Looking at the legendary hand dial thirteen, many netizens are very excited. S ome people say, "If you think of this as a power-on password, the picture is simply too beautiful." O thers said, "I've heard the teacher before, and now I'm finally seeing it, and I'm excited." " More netizens praise" is really too good. ”

There is no limit to human intelligence, and since its invention in 1970, the history of computers has gone through many years, and the types of computers are constantly changing. I n the future, there may be greater changes. Then again, for the above "hand dial 13" source code, what do you think?