The enjoyable half about logic gates is that there are such a lot of methods to make them, with every strategy having its personal benefits and drawbacks. Though nowadays transistor-transistor logic (TTL) is the commonest, diode-transistor logic (DTL) as soon as was an everyday sight, in addition to diode-resistor logic (DRL). These logic gates are the subject of a latest video by [Anthony Francis-Jones], overlaying a spread of logic gates carried out utilizing largely diodes and resistors.
Of notice is that there’s one other class of logic gates: this makes use of resistors and transistors (RTL) and preceded DTL. Whereas DRL can be utilized to implement AND and OR logic gates, some varieties of logic gates (e.g. NOT) require an lively (transistor) ingredient, which is the place DTL comes into play.
Along with the development of a moderately demonstration system and clarification of particular person logic gates, [Anthony] additionally exhibits off a spread of DTL playing cards used within the Bendix G-15 and numerous DEC techniques. Over time TTL would come to dominate as this didn’t have the diode voltage drop and different points that prevented important scaling. Though the rise of VLSI has rendered DRL and DTL firmly out of date, they nonetheless make for an interesting educating second and remind us of the hassle over the a long time to make the computing gadget on which you’re studying this potential.
