It’s technically true that any piece of software can be reproduced in hardware, although modern software’s size and complexity generally makes this a non-starter. But if we go far enough back in time, older software becomes easier and easier to implement in hardware. The original DOOM from 1993 might one day be recreated in full this way, but that day is not today. Instead, [Nick] has recreated the original music from that game, playing the opening track in nothing but 555 timers.

The circuit starts with a 555 timer that acts as a system clock with a rate of just over 7 Hz. These pulses feed a binary counter which in turn feeds a decoder, giving the circuit 15 positions. Each output of the decoder feeds to a diode matrix which stores information about what pitch the circuit should play. The circuit only needs to play six pitches so the diodes effectively connect each moment in time to one of these six notes. From there the circuit feeds into a set of switches which select different resistor networks of another 555 which is actually responsible for producing sound. The resistor networks have different values to adjust the timing of the 555 to produce different pitches.

Of course this entire exercise is largely academic as almost any microcontroller would be able to be programmed to play this chiptune quite easily, but it’s not a bad idea to get down into the weeds of digital logic from time to time in order to refine one’s skills and knowledge about what’s really going on in the inner workings of circuits. Or, go even deeper than that and build the logic gates themselves from first principles.

For decades, console owners have faced a choice between the convenience of digital downloads and the permanence of physical game discs. Soon, Xbox owners will be able to get the best of both worlds for thousands of supported titles as part of a newly announced disc-to-digital program.

The program—announced today ahead of testing for Xbox Insiders starting August 31—will let players claim a "digital entitlement" for "most Xbox One and Xbox Series X disc-based games" simply by inserting the disc into a console and launching it. That game will then be playable completely digitally, without the need to ever insert the disc, as long as you (or a member of your family account) is logged in. The digital entitlement will also allow access to features like Xbox Play Anywhere (for play on PC) and Xbox Cloud Gaming, for supported titles.

Microsoft says that your physical disc will "continue to work exactly as it always has" after the digital entitlement is claimed. But before you get any ideas, the fine print on the announcement mentions that there is only "one revokable license per game disc," so if you resell that disc or loan it to a friend, that digital entitlement could be transferred to a new account when someone else puts it into their console.

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