I just completed "Cafeteria" - Day 5 - Advent of Code 2025 #AdventOfCode https://adventofcode.com/2025/day/5
On a #Ti92 calculator using TI-BASIC.
I like that Part 1 was doable using array operations, and therefore finished quite fast.
Part 2 took much longer, but I was still surprised how […]
I just completed "Printing Department" - Day 4 - Advent of Code 2025 #AdventOfCode https://adventofcode.com/2025/day/4
Part 2 took more than 12 hours on my #Ti92 #GraphingCalculator, and it is already an optimized version. No clue how long the naive approach (part 1 in a loop) would have taken […]
I left my #Ti92 calculator running over night, for Day4 Part2 of this year's #AdventOfCode. Today I woke up to the wrong result.
It did work for the test data....
I found a bug meanwhile, so I'll re-run it now. I hope that there was only this one bug, as it takes several hours to process the […]
Today I got back to #AdventOfCode. I spent a couple of minutes getting annoyed by the limitations of #Ti92 basic:
- No structures. No tuples.
- Functions cannot use lists-of-lists ("Data").
- No passing-by-reference (except for non-local variables).
- Functions are pure. They cannot mutate […]
I'm still on day 4 of #AdventOfCode. Part1 is done, but it took about an hour on my #Ti92 calculator...
Part 2 will therefore take days if I don't implement some kind of trimming feature that removes already cleared-out areas from the search-space. Even with proper trimming I do expect it to […]
I got my #Ti92 calculator back in 1999, but I was today years old when I learned that one can store values at a given row/column inside a matrix:
```
[1,2;3,4]->x
5->x[1,1]
x
```
will yield
```
[5,2;3,4]
```
I just completed "Lobby" - Day 3 - Advent of Code 2025 #AdventOfCode https://adventofcode.com/2025/day/3
Again on a #Ti92 #TiCalc. Part 2 took over 30 minutes to run...
https://git.grois.info/aoc-2025/tree/day3
The input for Day 3 of this year's #AdventOfCode is so long again, that I'm afraid that I will have to split it in order to allow my #Ti92 #TiCalc to process it...
At least part 1 seems to be simple enough to finish in a reasonable time on tha ancient hardware.
I just completed "Gift Shop" - Day 2 - Advent of Code 2025 #AdventOfCode https://adventofcode.com/2025/day/2
On my #Ti92 #GraphingCalculator. Part2 took quite a while to finish. Not sure if that's normal or if there's a bug...
In any case, the result was correct, so I'm happy […]
My plans for this year's #AdventOfCode were to try to do at least some of the riddles on my #Ti92 calculator.
Turns out, already the first one is a challenge, due to the input size.
It's so large, that one cannot even create a single string variable on th calculator that holds all of it.
This […]
