Is there a simple way to divide by 10? (Not just dgt 1; 100 -> 10)

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Grim

1 Jan, 2023 @ 2:50pm

Is there a simple way to divide by 10? (Not just dgt 1; 100 -> 10)

Hey—I'm stuck on a level in the bonus campaign and just can't seem to get past it. My solution is almost complete for voltage values 0-99 but fails if the input is 100, because "dgt 1" will return zero, and the program treats the value as if it were between 0-9.

Due to the way things are set up, I don't really seem to have the space to add anything else which could help. My chips are pretty much full of code, except for one line that I can spare—But since it's only one line I can't do teq acc 100, +mov 99 acc.

Is there a better hack that I can use to divide by ten? If I was able to convert 100->10 in one or two instructions (and, obviously, all other values into their tens digit) it would perfectly solve my issue but I just can't seem to figure out a way to lop off the ones digit and leave the other two both intact.

Thanks for any advice.

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Showing 1-9 of 9 comments

thewifiwhisperer has SHENZHEN I/O

2 Jan, 2023 @ 2:57am

If you have space for a DX300 spare, you can often use that as a hacky way to check. It's been a while since i played, so no real good advice here.

(I sympathize, never got past puzzle 4 in the bonus campaign)

Last edited by thewifiwhisperer; 2 Jan, 2023 @ 3:10am

Grim

2 Jan, 2023 @ 7:00pm

Originally posted by thewifiwhisperer:
If you have space for a DX300 spare, you can often use that as a hacky way to check. It's been a while since i played, so no real good advice here.

(I sympathize, never got past puzzle 4 in the bonus campaign)

I'm not completely sure I understand what you're suggesting?

thewifiwhisperer has SHENZHEN I/O

14 Feb, 2023 @ 7:36am

If you can send the data to the 'x0' of a DX300, then you should get 100 only from the p1 pin, if divisible by 10 and not 100. otherwise pin p0 and p2 will also give output.

This requires a lot of space you don't have. (for both the DX300 and for some NOT/AND logic.)

gbors

14 Nov, 2023 @ 12:09pm

Probably too long overdue, and I also can't divide by 10, however, I can help with this specific problem if you have space for two instructions.

Originally posted by Grim:
If I was able to convert 100->10 in one or two instructions (and, obviously, all other values into their tens digit) it would perfectly solve my issue but I just can't seem to figure out a way to lop off the ones digit and leave the other two both intact.

teq acc 100
+mov 10 acc

I know, it's ugly. But it works.

Last edited by gbors; 14 Nov, 2023 @ 12:10pm

Grim

14 Nov, 2023 @ 8:33pm

Originally posted by gbors:
Probably too long overdue, and I also can't divide by 10, however, I can help with this specific problem if you have space for two instructions.

Originally posted by Grim:
If I was able to convert 100->10 in one or two instructions (and, obviously, all other values into their tens digit) it would perfectly solve my issue but I just can't seem to figure out a way to lop off the ones digit and leave the other two both intact.

teq acc 100
+mov 10 acc

I know, it's ugly. But it works.

Yeah I don't think that would work for me. You can see in my post that I tried to do something similar (except with 99 instead of 10, so that 100 would map to 9) but I just don't have the room for it.

I can't just subtract 1 from each number either, because then if a number is, say, exactly 20, it would turn into 19, and dgt 1 would return 1 instead of 2.

gbors

14 Nov, 2023 @ 10:45pm

Ah yes, I was focusing on the 3rd paragraph and didn't pick up on the second.
Then how about this instead of dgt 1:
mul 10
dgt 2

As 100*10 will be 999, it will give you the expected result on all inputs in the top digit - however, I don't know how dependent your code is on having the result in the middle digit.

Grim

14 Nov, 2023 @ 10:46pm

Originally posted by gbors:
Ah yes, I was focusing on the 3rd paragraph and didn't pick up on the second.
Then how about this instead of dgt 1:
mul 10
dgt 2

As 100*10 will be 999, it will give you the expected result on all inputs in the top digit - however, I don't know how dependent your code is on having the result in the middle digit.

Wait really? That works? Give me a minute to try it out.

This might take a while because I forgot how this code works. At some point I solved the level, idk how. Now I need to remind myself what eldritch nonsense I programmed.

Last edited by Grim; 14 Nov, 2023 @ 10:54pm

Grim

14 Nov, 2023 @ 11:07pm

You're an insane genius. I would've never thought to abuse the number cap. Feels like it should be against the rules, but then I guess that's how a lot of Zach's games work. Had to fiddle with the code a little bit to figure out where I actually needed to PUT the multiply command but it worked when I figured it out. Thanks!

gbors

14 Nov, 2023 @ 11:37pm

Well, after posting without reading properly, I felt kinda obliged to come up with something that actually works :D

Yes, most Zachtronics games rely on your finding shortcuts at various levels of preposterousness - Shenzhen IO probably even more than the others. And while I don't always like this, I have to admit that it's very accurate of a game simulating a job at a Chinese microelectronics company.

Glad that the solution worked!

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SHENZHEN I/O > General Discussions > Topic Details

Date Posted: 1 Jan, 2023 @ 2:50pm

Posts: 9