I just finished ALU and RAM. I'm now very close to finally be able to run this cpu. When I finish I want to share the files here. I have spent about 12 hours now on this simulator and I haven't noticed any bug. Just be careful when you delete modules from %appdata% since if you delete a module that you forgot you used in another module previusly working parts that contained removed module will stop working with no notification. Biggest drawback is the fact that we have limited area to work on but I feel like I got used to it after the first 5-6 hour. My previus comment was about clocks but you can make clocks with adjustable frequancy and pulses with different durations. adjusting them is not that ideal but I don't think anymore that is a problem since I never used a clock or pulse so far. Obviusly I need at least one clock but I belive a manuel input would be actually better then a clock module. That way I can use a autoclicker and be able to preciesly change frequancy.
half of an adder with a normal Exclusive OR
this is a interesting X-OR this one can cancel out the x-or function and turn into a normal Or and there are other ways to cancel the xot function but the one here basicly shows you how it’s doing it
an full adder using the normal x-or and special x-or and 2 other functions the FC and can look unless due to the OR but the CIN only for carry wile Flood Carry turns on all the carrys at once. edited ok to fix this make shure you make the OR function cancel out the AND gate in the picture below.
a group of full adders the Carry out (COUT) is connected into Carry in as a carry to each Full adders except for one thats connected as a function the FC is connected to ALL the FCs of the full adders and OR function is connected to all Full adders too. also known as a Ripple carry adder (RCA) the slowest type of adder out there but good for beginners.
inverters basically can take a binary input and flip it. like 1001 to 0110
1 to 2 inverters are required i prefer 2. one Ripple carry adder and other outputs this time which is the Zero flag (Fz) and the negative flag (Fn) and 2 new inputs for input a and b with all these functions you can add and subtract in binary and do basic logic like NOR, X-OR, AND, OR, NAND, and X-NOR. the reason why not is not in the list be because you can do NOT function but Nor hastily dose the exact same thing so its one less peace of programming you have to worry about
thats all the basics of the ALU hope you enjoy the info.
the Arithmetic logic unit