dietrichepp

3 mesi fadiscuss

I also run some accounts on BlueSky and Twitter that focus on 1-bit art:

https://bsky.app/profile/1bitdreams.bsky.social

https://x.com/1BitDreams

I see maybe 10 or 15 new pieces of 1-bit art posted on those platforms each week. A couple recent ones:

https://bsky.app/profile/ncesium.bsky.social/post/3miwkrqev5...

https://bsky.app/profile/oddbones.bsky.social/post/3mi7pedpn...

dietrichepp

4 mesi fadiscuss

I remember playing this, but also a puzzle game called “dstar”, which I ported to the web: https://www.moria.us/games/dstar/play

dietrichepp

5 mesi fadiscuss

This is great stuff… basically, an easy way to get much higher quality audio out of a GBA emulator.

I’ll add some context here—why don’t more games run their audio at 32768 Hz, if that’s such a natural rate to run audio? The answer lies in how you fill the buffers. In any modern, sensible audio system, you can check how much space is available in the audio buffer and simply fill it. The GBA lacks a mechanism to query this. Instead, what you do is calculate this yourself, and figure out when to trigger additional audio DMA from the VBlank interrupt. You know the VBlank runs every 280896 cycles, and you know that the processor runs at 16777216 Hz, so you can do some math to calculate how much data is remaining in the audio DMA stream.

A lot of games simplify the math—it’s easier to start a new audio DMA in your VBlank handler, but that means running at a lower sample rate, which will sound pretty crispy.

YMMV, some people like the crispy aliased audio. If the audio weren’t crispy, the sound designers probably would have adjusted the samples to compensate. Other factors being equal, I’d rather listen to what the original artists heard when they were testing on real hardware, because that is probably closer to what they intended, even though it has a lot of artifacts in it.

dietrichepp

5 mesi fadiscuss

Recently fixed bugs in an audio encoder / decoder (VADPCM) I reverse engineered from the Nintendo 64, and some people are apparently using it to dub Conker’s Bad Fur Day into Spanish.

On-and-off again working on a Mystery Dungeon style game but I have a lot of obligations taking me away from it.

Planning on making demoscene entries this year.

dietrichepp

7 mesi fadiscuss

If we only had trucks on the road, we’d need less road, right? The street where I live could be about a third of the width if it were not for personal cars.

dietrichepp

7 mesi fadiscuss

The civic barely does anything to a road, except require its existence and maintenance, and it turns out that roads are expensive to build and maintain (even if only damaged by weather).

dietrichepp

8 mesi fadiscuss

> Why are you using the locale-specific [:space:] on source code?

Because it’s the one I remembered first, it worked, and I didn’t think that it needed any improvement. In fact, I still don’t think it needs any improvement.

dietrichepp

8 mesi fadiscuss

Somebody wanted to set breakpoints in their C code by marking them with a comment (note “d” for “debugger”):

//d

You can get a list of them with a single Awk line.

  awk -F'//d[[:space:]]*' 'NF > 1 {print FILENAME ":" FNR " " $2}' source/*.c

You can even create a GDB script, pretty easily.

(IMO, easier still to configure your editor to support breakpoints, but I’m not the one who chose to do it this way.)

dietrichepp

8 mesi fadiscuss

Awk is still one of my favorite tools because its power is underestimated by nearly everyone I see using it.

    ls -l | awk '{print $3}'

That’s typical usage of Awk, where you use it in place of cut because you can’t be bothered to remember the right flags for cut.

But… Awk, by itself, can often replace entire pipelines. Reduce your pipeline to a single Awk invocation! The only drawback is that very few people know Awk well enough to do this, and this means that if you write non-trivial Awk code, nobody on your team will be able to read it.

Every once in a while, I write some tool in Awk or figure out how to rewrite some pipeline as Awk. It’s an enrichment activity for me, like those toys they put in animal habitats at the zoo.

dietrichepp

8 mesi fadiscuss

I have the Heritage HA-609A. I considered going 500-series. Maybe some day in the future. For now, I have two preamps and the HA-609A in a 4U rack, and most of my other gear is in storage. Keeping things light.

dietrichepp

8 mesi fadiscuss

It would be like this either way.

The N side has negative charge carriers. It has a positive charge in the depletion region because the charge carriers are missing. Likewise, the P side has positive charge carriers, and when they’re missing, you get a negative charge.

This is true whether we live in the current universe or live in an alternate universe where we say that electrons have positive charge. The depletion region is where the charge carriers are missing (depleted), so you get the opposite charge of whatever the charge carriers are.

dietrichepp

8 mesi fadiscuss

Conspicuously absent are some of the analog circuit applications. Here are three of my favorites:

1. Frequency mixer, used for heterodyning, important in radio, so I hear. https://en.wikipedia.org/wiki/Frequency_mixer

2. Log converter, where the output voltage is proportional to the logarithm of the input voltage. https://electronics.stackexchange.com/questions/374440/log-c...

3. Diode ring, which provides variable gain, used in analog compressors like the Neve 33609 (I have a clone of the 33609, and I’m very fond of it)

Think about this: if you have a nonlinear device like a diode, then the dynamic resistance changes depending on the operating point. If you modulate the operating point, you’re modulating the dynamic resistance.

dietrichepp

9 mesi fadiscuss

Fantastic—I’ve written a QuickDraw PICT converter, but I focused narrowly on just extracting pixel data. The format is basically a way to encode QuickDraw drawing commands, and getting the original image back (in the general case) means reimplementing QuickDraw.

The old Mac game Avara used this format for levels. It was funky… you could place blocks in a 3D world, and control elevation and height by changing the corner radius of rectangles. You needed a QuickDraw image editor to make levels, like ClarisDraw.

dietrichepp

9 mesi fadiscuss

Yes, other Mac AV models did the same thing. I remember doing this on the 6100/60AV that we had.

dietrichepp

5 anni fadiscuss

I'm open to SRE or non-SRE roles.

dietrichepp

5 anni fadiscuss

Location: New York, NY, USA

Remote: No

Willing to relocate: No

Technologies: Go, C++, Python, C#, etc. Backend / distributed systems programming. Mathematics, statistics, simulations, storage systems.

Résumé/CV: Full resume on request. >5 years in software engineering. Software Engineer at Facebook, Software Engineer / SRE at Google, Software Engineer at Mentor Graphics.

Email: depp at moria dot us

Stack Overflow: https://stackoverflow.com/users/82294/dietrich-epp

GitHub: https://github.com/depp/

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