jetlib.sec » Tags » logic-chip

[Kyle] has been hard at working building an 8-bit computer from the ground up. He’s using a set of logic IC’s for the various components, and some NVRAM chips to store the control words. What you see above is the roadmap for his instruction set. He’s just started writing them to the chips, making the [...]

Tags:  logic bit computer logic-ic logic-chip bit-computer pcs hacks  

Late last week, we saw a rather clever combination lock build that used only a single 74xx logic chip. [J. Peterson] read this post, and in a battle royale of geek one upmanship sent us a write up of the logic chip computer he built nearly 30 years ago at the University of Utah. Around 1982 or [...]

Tags:  design logic chip j.-peterson logic-chip clever-combination chip-computer classic hacks  

[Andrea] built this LED chaser using one logic chip. It illuminates all but one of the six LEDs, with the dim bit moving back and forth along the row in a chase sequence. This is something like an inverse Larson Scanner without the fading tail. But doing it with a logic chip instead of a [...]

Tags:  logic chaser chip andrea larson-scanner logic-chip leds classic hacks  

[Jonathan Thomson] just finished writing up his entry for the 7400 logic contest. It’s a voltage doubler that uses a 74HC14 logic chip. Because this is not at all what the chip was meant for–and he’s a sucker for puns–he’s calling it the Illogical Dickson Doubler. What he’s got here is basically a charge pump [...]

Tags:  logic voltage illogical jonathan-thomson dickson-doubler voltage-doubler logic-chip puns misc hacks