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author=Ian Ward;
description=Ian’s projects;

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20xt6 homebrew cpu project excess org ian s projects excess org ian s projects home projects categories search 20xt6 homebrew cpu project homebrew cpu plan step 1 this video introduces the first milestone for our homebrew cpu project transcript simple clock circuit with a 555 timer in this video we create a clock circuit with a 555 timer in astable mode and use it to blink a green led transcript manual clock circuit controls we add a potentiometer and a single step button to our clock circuit schematic transcript synchronous 4 bit binary counter 74ls163 we connect our clock circuit to a 74ls163 synchronous binary counter and see how to count reset and load values into the counter transcript 16 bit address register we add three more 74ls163 s to our counter to make a 16 bit address register for our homebrew cpu project transcript power on and manual reset circuit we add a reset circuit to our clock module that resets our address register to 0 on power on and when a button is pressed transcript clock halt circuit with 4011 nand gate and 555 timer we complete our clock module by adding a halt signal and test it with our address register now our future programs won t have to run forever schematic transcript sst39sf040 512k flash upgrade we build a larger address register and use it to test an sst39sf040 512k flash chip transcript milestone 1 lcd character display we connect an hd44780 powered lcd character display to the circuit and play a simple text animation from the program rom transcript cmos vs ttl what are logic families in this video we replace our clock s 4011 cmos quad nand gate ic with a ttl equivalent and discuss compatibility between different logic families transcript homebrew cpu step 2 rhythm game plan we re turning a movie playing circuit into an actual interactive game this video lays out what we need to do use the hd44780 scrolling feature for the play field design custom cgram characters build a controller for user input build a health tracker to halt the circuit on game over tie it all together with new logic opcodes and program code transcript