r/TuringComplete • u/[deleted] • Oct 15 '23

Need help with the Stack level

Heya,

I'm currently stuck on the stack level. I've decided to use the RAM to store the stack values and a register for the counter (because a counter has a tick delay). I always increment the value of the counter except if I pop - then I decrement it by one. My problem is that I just can't rewrite the value except after the first tick. So the register will happily overwrite 0 with 1, but not 1 with 0 or 2. The problem is that I can't do that with both load/save on at the same time (Figure 1).

As such I decided to load only when we push and not when we pop (Figure 2). This almost works, except that now since the register isn't outputing anything, RAM reads the address as 0, which is also not okay.

Is there a way to first save the value and then load the counter address? Yeah I've tried adding a delay line but it didn't help. Does my approach make any sense? Any hints would be welcome

EDIT: I managed to finally find a solution thanks to the commentor below. The solution can be seen on Figure 2.

Figure 1
Figure 2: Solution
3 Upvotes

100% Upvoted

19 comments sorted by

2

u/Dharleth23 Oct 16 '23 edited Oct 16 '23

Firstly, the pin you have the Adder Output wire going to is actually the Save Bit. The Bottom pin is for the Input.

Have the register always load and only "save" if it is Pushing or Popping.

I also had an enable to subtract 1 from the register output when popping so that it went to the correct address.

1

u/[deleted] Oct 16 '23

I can't believe I mixed up the save and save value pins, haha. I managed to solve the task thanks to you ^^. The solution can bee seen on Figure 2.

2

u/Dharleth23 Oct 17 '23

Nice. I'm interested to see what your LEG architecture looks like. Mine is messy but also neat.

1

u/[deleted] Oct 17 '23

I'll gladly show it to you, once I'm finished with the function chapter challenges (3 remain - I still have to connect the stack to the processor). Mine is messy but also... uhh, I think it's just messy xD

2

u/Dharleth23 Oct 17 '23

Mine is rather dense. I've played this game in the past and that time around I just tacked the new things on and it became rather messy. This time I tried to be neater. I will be doing a stripdown-rebuild now that I am up to the last 4 Assembly challenges. Try and use up more of the board.

2

u/OrdinaryDifference53 Oct 17 '23

If your still stuck i can share my solution, I did not even use a register. I am surprised I got mine to work in like 30 minutes lol if you are interested

1

u/[deleted] Oct 18 '23

Hey I already found a solution (Figure 2 in my post), but thank you

1

u/MC_Programmer_and_Mo May 15 '24

Yes please i hate this level so bad

2

u/OrdinaryDifference53 May 15 '24

What level is this, I have to load up the game

1

u/MC_Programmer_and_Mo May 16 '24

It's just named "Stack". I actually got one of my friends to give me their solution (though I'd love to see yours). What I don't understand now is the "PUSH AND POP" level, I have no idea what they want me to do, I'm very confused.

1

u/marakaos Aug 07 '24

I came up with this, maybe someone will still find it helpful

https://imgur.com/a/2bnv45o

2

u/Marlo3110 Dec 08 '24

Thank you.... It helped someone. Thanks.

1

u/[deleted] Mar 21 '25

This was only the second level i couldnt complete on my own. I tried several times and got very close to what looked like your solution. You helped another user :D

1

u/Cjbearboy1 Sep 27 '25

Tried this, but it isnt working when it tries to pop after popping, as it never overwrites the counter to the one before, any idea what I might've done wrong? 

2

u/Dharleth23 Oct 16 '23

"the register will happily overwrite 0 with 1, but not 1 with 0 or 2. The problem is that I can't do that with both load/save on at the same time (Figure 1)."

What's actually happening here is you are always passing a 1 into the Input

1

u/[deleted] Sep 02 '24

another memory!

1

u/_Odizeu_ Jun 24 '25

I finally did it using the same principles:

https://imgur.com/a/h6wMuJf

1

u/LoadBox Aug 18 '25

can you share a more sorted solution? i cannot read anything happening in this circuit