Dmitry Grinberg @dmitrygr Twitter profile

Last Seen Profiles

@VmaniakJ

@vcanilIa

@PLHVML

@neseaut7692

@bader222abha

@Uziblackkk

@NATAIOBOT

@ruto560

@AnsonBelt

@laos_1983

@KonekoKittenYT

@rjstankey

@andy_tow

@animeunitedBR

@sarahthenymph

@Stewart1213xen1

@bobbysbunny_

@TrePgs

@godragoner

@MarissaSwa71836

@PeggedPrinceOfD

@SwdnySadk

@svartmogel

@dayzeejean

@PilarGGranja

@Robert14681437

@i_cocoron

@MultiD_Verse

@Rw85959206

@herkesgibivar

@bahanintipan

@yohinessj

@OfcArtism

@Sudetekbayan

@mtlqh_alqt2364

@12Mentorluk

Dmitry Grinberg

@dmitrygr

3 months

Today I joined a very exclusive club. The club of people who have been dragged off stage at @defcon from the talk there were meant to participate in. Thanks to all who then came out to my outside talk. Glad I was able to answer all question. It was fun.

25

162

3K

Dmitry Grinberg

@dmitrygr

3 months

Yup. This volunteer firmware writer (me) made the fix from his laptop in the plane on the way to defcon. And was then dragged off stage during badge talk. Yup…

DEF CON

@defcon

3 months

#defcon32 Badge update: Thanks to everyone who has reached out to us about the DEF CON 32 badge. We are aware of the save issue and a fix is incoming. Later today we'll have a patch and some instructions for you at . We'll keep you posted in these spaces.

24

96

515

20

122

2K

Dmitry Grinberg

@dmitrygr

2 years

Gas prices so high, gas stations are switching to scientific notation.

7

174

1K

Dmitry Grinberg

@dmitrygr

2 years

V2 business card PCBs arrived. These run Linux :). Now with usb-c. Hope to bring those up later.

25

63

701

Dmitry Grinberg

@dmitrygr

3 years

What if I told you that this runs Debian Linux?

37

45

707

Dmitry Grinberg

@dmitrygr

7 months

@awr_hey You misspelled “that actually works, is supported on every architecture under the sun while also not getting in your way unnecessarily, and is the language that ALL SDKs ever ship in.”

5

4

653

Dmitry Grinberg

@dmitrygr

1 year

#rp2040 runs unmodified PalmOS 5.2.8 (showing off world’s only ARM-to-thumb1 JIT)

16

141

645

Dmitry Grinberg

@dmitrygr

2 years

Final PCBs are here. Note the complete lack of traces! :)

18

55

460

Dmitry Grinberg

@dmitrygr

9 months

Playing with the world’s tiniest camera! It is so small that the data sheet lists dimensions in µm. You can see it there in the baggie - the tiny black speck. Please forgive the poor color quality in the video. I was too lazy to implement proper de-bayering. 320x320x10bpp

17

53

447

Dmitry Grinberg

@dmitrygr

3 months

Found out that defcon banned me from the discord bot. Cold. So much for their public statement saying I am “welcome”. 🤣

11

36

375

Dmitry Grinberg

@dmitrygr

3 months

14

17

319

Dmitry Grinberg

@dmitrygr

3 months

If you have more video angles of me being dragged off stage please send them to me :)

2

5

300

Dmitry Grinberg

@dmitrygr

3 months

@0xDISREL @defcon Joke is on them. They have no contract with me. None. They have no rights to my firmware. DMCA notice may be incoming. Still deciding.

6

1

291

Dmitry Grinberg

@dmitrygr

3 months

@0xDISREL @defcon I was told that “DT was pissed”. That is all.

4

0

248

Dmitry Grinberg

@dmitrygr

1 month

Linux boots in 4.76 days on the Intel 4004 | Ars Technica

Linux boots in 4.76 days on the Intel 4004

Historic 4-bit microprocessor from 1971 can execute Linux commands over days or weeks.

arstechnica.com

8

29

217

Dmitry Grinberg

@dmitrygr

3 months

@cgallaty I wrote their firmware that they shipped.

2

1

210

Dmitry Grinberg

@dmitrygr

2 years

Latest project: My business card runs Linux, and so can yours.

8

42

182

Dmitry Grinberg

@dmitrygr

7 months

@awr_hey No, no idea what you are talking about. Basically, every architecture out there that has a compiler of any sort, has a compiler for C. There are indeed some that are only programmable in assembly. Everything that has a compiler, has a C compiler

1

182

Dmitry Grinberg

@dmitrygr

2 years

Oh NBD. PalmOS 5.2.8 on an RP2040 with a $13 COTS screen.

13

31

183

Dmitry Grinberg

@dmitrygr

24 days

@WeldPond Oh please! USSR has been gone for decades and .su domains are still going strong.

3

1

176

Dmitry Grinberg

@dmitrygr

4 months

@elaifresh @litindustrial Uh huh… I personally know a person at Google who got ranted at in a team meeting for taking a vacation to Hawaii. Apparently white people shouldn’t go there because that’s colonialism. After that event, my weekends were always “fine” and interests were always “sleeping”.

8

2

169

Dmitry Grinberg

@dmitrygr

1 year

This device shipped with PalmOS 1.0. Thanks to rePalm-PalmCard it can run 5.2.8 now. ARM instead of 68k, IrDA, SD, audio.

6

23

169

Dmitry Grinberg

@dmitrygr

7 months

@briandstone__ Posts like yours make my head hurt. 45KWh/9days averages out to a 312W draw constantly. Running a few cameras and recording to a USB stick should not use 300 fucking watts! It should fit into 3W at most.

15

0

157

Dmitry Grinberg

@dmitrygr

2 years

I'll explain this one last time:

4

25

138

Dmitry Grinberg

@dmitrygr

1 year

rePalm progress: MP3 playback using an unmodified copy of PocketTunes. This is running real-time via the ARM-to-Thumb JIT

7

19

131

Dmitry Grinberg

@dmitrygr

8 months

The SDIO card itself runs PalmOS5. Device just acts as screen and touch. rePalm-SDIO powered by #rp2040

5

15

125

Dmitry Grinberg

@dmitrygr

3 months

The first device designed to run PalmOS from the start since 2010s dropped today.... the DEFCON32 badge....

rePalm downloads for DEFCON badge

DEPRECATED For new hardware, see https://www.ucritter.com/ New discord: https://discord.gg/qz9tbhrJ -dmitrygr OLD CONTENTS: Here you can find rePalm firmware downloads for DEFCON 32 badge. The badge...

docs.google.com

3

10

127

Dmitry Grinberg

@dmitrygr

3 months

@synacktic

2

15

124

Dmitry Grinberg

@dmitrygr

3 months

@c7five @defcon Hi. I’m the “someone”. This project was 6 years in the making. It is called “rePalm” and much docs on it exist on

Dmitry.GR: Projects

Dmitry.GR: Dmitry.GR: Projects

dmitry.gr

4

11

122

Dmitry Grinberg

@dmitrygr

3 months

About this mess: Entropic has repeatedly offered to published their entire comms history with @defcon . I am also happy to do so. Defcon has not offered. Conclude what you wish from that.

4

12

106

Dmitry Grinberg

@dmitrygr

3 years

Latest project. 4xAAA battery as power source. One year of battery life and a new algorithmically-generated image daily.

8

104

Dmitry Grinberg

@dmitrygr

3 years

@emilyldolson @googledrive I always did say that Franz Kafka never died. He is semi-retired working in google’s PM org, occasionally consulting for the UX teams as well.

0

7

99

Dmitry Grinberg

@dmitrygr

1 year

A while ago I made one of these as a present for my mom. Now I finally ported my code from ARM to xtensa to allow me to run it on inkplate10. Generates a new random image every 8h. Battery lasts a year. Inspired by the “shanshui” project, but not using its code (it was too slow)

3

6

91

Dmitry Grinberg

@dmitrygr

3 months

@wren6991 I have most of 32bit softfloat implemented for a 4bit cpu. LMK if you want a copy.

2

79

Dmitry Grinberg

@dmitrygr

4 months

@elaifresh @litindustrial Are you kidding? Just so that person could “be offended” at you too? Everybody stayed as silent as the grave.

2

0

71

Dmitry Grinberg

@dmitrygr

3 months

@MightyMogomra Here is the video of it.

7

5

67

Dmitry Grinberg

@dmitrygr

3 months

@medus4_cdc @J0hnnyXm4s @defcon My badge was not taken away. I still have my badge team badge. 🤣

1

0

66

Dmitry Grinberg

@dmitrygr

18 days

What have we here?

9

6

65

Dmitry Grinberg

@dmitrygr

1 month

My latest project: booting full Linux on an intel 4004 from 1971 for fun, art, and no profit: #4004in2024

Linux/4004 - Dmitry.GR

Dmitry.GR: Slowly booting full Linux on the intel 4004 for fun, art, and absolutely no profit

dmitry.gr

2

17

75

Dmitry Grinberg

@dmitrygr

1 year

IrDA works on rePalm on #rp2040

2

8

63

Dmitry Grinberg

@dmitrygr

12 days

TADA: PalmOS 4.5.9 on @pimoroni pico2 plus based on the @Raspberry_Pi #RP2350 Running the Warfare Inc game

4

10

65

Dmitry Grinberg

@dmitrygr

3 months

Hey, @defcon , maybe calm down with the illegal behavior a little?

Entropic Engineering

@entropiceng

3 months

Bad news: Now they flagrantly violated our NDA and posted this without asking. Classy. Good news: it clearly shows that we delivered the final product. Better news: We were always planning to open source, just, ya know, consensually.

6

18

92

4

7

60

Dmitry Grinberg

@dmitrygr

4 years

SSD1675A only support 3 colors? Well, now it supports 6!

5

3

59

Dmitry Grinberg

@dmitrygr

1 year

Pro tip to future “secure boot” designers. TOCTOU is not just a funny way to misspell “toucan”🦜 but also likely the sword you’ll die on if you try to get too clever. This message brought to you by a now-unsecured Cortex-M4 based mcu from a well known company.

1

12

54

Dmitry Grinberg

@dmitrygr

2 years

Built, with a debug header too :)

4

1

54

Dmitry Grinberg

@dmitrygr

2 years

Using RP2040 DMA+PIO to drive a poorly-designed but cheap display from waveshare:

Complex PIO machinery - Dmitry.GR

Dmitry.GR: Driving a poorly-designed display and touch board using no CPU at all

dmitry.gr

6

58

Dmitry Grinberg

@dmitrygr

2 years

Ignore the camera artifact from the oled. :)

5

2

53

Dmitry Grinberg

@dmitrygr

3 months

@TC_Johnson @medus4_cdc @J0hnnyXm4s @defcon I have no idea!! Nobody told me anything!

1

50

Dmitry Grinberg

@dmitrygr

3 months

@darkswordsmantv @0xDISREL @defcon For adding an Easter egg crediting the hardware company that designed the badge haddware and then had their name removed from plastics and uninvited to the badge talk. Defcon saw Easter egg and told me my attendance in the talk is also cancelled.

5

4

49

Dmitry Grinberg

@dmitrygr

4 years

7greys+yellow big 4greys+red small 100% working 🙂

4

2

48

Dmitry Grinberg

@dmitrygr

2 years

Projects can continue!

2

0

46

Dmitry Grinberg

@dmitrygr

3 months

@JayFoxtrot Longest comment there is true. Ther is also a hacker news thread.

0

2

47

Dmitry Grinberg

@dmitrygr

3 months

@TC_Johnson @J0hnnyXm4s @medus4_cdc @defcon I am happy to answer any questions from at least what I know, stand for, did, and plan to do

2

4

45

Dmitry Grinberg

@dmitrygr

1 year

I don’t usually do product endorsements, but feel free to consider this my official professional recommendation to use #rp2040 over almost any other microcontroller in almost all cases.

3

4

44

Dmitry Grinberg

@dmitrygr

1 year

The “short” summary of how this works:

rePalm - Dmitry.GR

Dmitry.GR: PalmOS on new hardware!

dmitry.gr

2

9

44

Dmitry Grinberg

@dmitrygr

9 months

Here is how it is connected (2x2 bga 0.4mm spacing). 10x magnification. The camera itself is hidden in one of the holes on this protoboard, where the four wires meet.

1

42

Dmitry Grinberg

@dmitrygr

1 month

A MAME developer got MAME to boot my linux-on-4004 project...in MAME!!! Source:

1

2

42

Dmitry Grinberg

@dmitrygr

1 year

@Wookiee__ There is only one answer. January 1, 1970.

2

0

41

Dmitry Grinberg

@dmitrygr

3 months

@max_deboosted @cchayer @defcon I didn’t want to resist. The security guards and I have no beef and I don’t want to hurt them or have them hurt me. They are just doing a job. Clearly they can overpower me. Why test that ?

1

0

38

Dmitry Grinberg

@dmitrygr

1 year

New rePalm-PalmCard boards are here. Alarm led now works.

1

7

36

Dmitry Grinberg

@dmitrygr

1 year

@legitleavitt @the_transit_guy Near 100%. Usually parking is full by 1030am. Source: work at Apple.

3

0

34

Dmitry Grinberg

@dmitrygr

4 years

Latest project:

PokéWalker hacking - Dmitry.GR

Dmitry.GR: Complete device takeover by blinking at it!

dmitry.gr

0

11

35

Dmitry Grinberg

@dmitrygr

3 months

@Cyberipman @defcon There are photos of it all over Twitter. It was a rainbow colored screen with the logo of the company that did all the hardware for the badge and was then uninvited from the badge talk and had their name removed from the plastics.

1

0

36

Dmitry Grinberg

@dmitrygr

9 months

@lukeweston @tdsepsilon "NEC_RGB_SGA_FOV120_F4.0" by ams OSRAM There is also a B&W one with the same resolution, but the one I am playing with is the color one. $84 ea:

NANEYE CAMERA MODULE (ME-1, M 2X2 RGB) | DigiKey Electronics

Order ams-OSRAM USA INC. NANEYE CAMERA MODULE (ME-1, M 2X2 RGB) (4991-NEC_RGB_SGA_FOV120_F4.0-ND) at DigiKey. Check stock and pricing, view product specifications, and order online.

www.digikey.com

2

0

34

Dmitry Grinberg

@dmitrygr

3 months

@medus4_cdc @glumDumpst3rPro @defcon DEFCON never had any contract with me. I worked for free under the understanding that I get to be part of the badge talk. Entropic did the hardware. Obviously that needs to be paid for. I didn’t get to talk, and I never granted defcon any license to my binary or code. DMCA :)

1

4

35

Dmitry Grinberg

@dmitrygr

10 months

@d_feldman False. Latency depends on connection establishment parameters and can be as low as 7.5ms. Source: a full-blown case of PTSD from working on Bluetooth for years.

4

0

35

Dmitry Grinberg

@dmitrygr

2 months

@wren6991 Signal integrity must be 🔥

2

0

34

Dmitry Grinberg

@dmitrygr

3 years

@matseng Yes. Except: 1. Designed for easy reproduceability (I’ll make a kit), 2. Usably fast. 3. Not ARM anymore. 4. Entirely new code.

6

0

34

Dmitry Grinberg

@dmitrygr

9 months

@ashleevance Has anyone considered parenting? Somehow my parents managed to teach me that drugs are NEVER a good idea. One could argue that this is evolutionary pressure FOR good judgement. A rare one nowadays.

1

0

33

Dmitry Grinberg

@dmitrygr

3 months

Happy 12th birthday to Trixie!

4

2

33

Dmitry Grinberg

@dmitrygr

2 years

And after some code refactoring and adding support for quad-channel RAM, it works!

2

0

32

Dmitry Grinberg

@dmitrygr

3 months

@202accepted They never shut it down or even came up to me. They just menacingly watched from afar as I stood on the public city sidewalk and signed badges.

2

1

31

Dmitry Grinberg

@dmitrygr

9 months

@cnlohr So what? It produces wrong results with high performance!!

1

0

30

Dmitry Grinberg

@dmitrygr

1 year

The update is read from SPI flash, hashed, and the signature is checked. If it all matches, the update is read again over SPI, this time for purposes of flashing to internal flash. ☠️

3

4

30

Dmitry Grinberg

@dmitrygr

2 years

This device never had a Pokédex app…or greyscale…

1

4

31

Dmitry Grinberg

@dmitrygr

3 months

@medus4_cdc @glumDumpst3rPro @defcon I stand by what I did. You cannot remove credit from people and in-invite them (they were supposed to be at badge talk too)

2

3

31

Dmitry Grinberg

@dmitrygr

1 year

Today's cursed project: Using 8MB of PSRAM natively on #RaspberryPi 's #RP2040 : It is memory mapped and accessible to all code! cool, eh?

ROMRAM - Dmitry.GR

Dmitry.GR: 8MB of real memory-mapped RAM on RP2040

dmitry.gr

3

8

30

Dmitry Grinberg

@dmitrygr

2 years

Pokémon Crystal :)

1

4

28

Dmitry Grinberg

@dmitrygr

4 years

This is #zbs243 aka #sem9110 - a custom Samsung chip with NO documentation of any sort used by SoluM ESL price tags. Shown here fully reverse engineered, with custom firmware (supporting 6 colors) and my wireless protocol! Write-up and details soon!

2

3

29

Dmitry Grinberg

@dmitrygr

1 year

@yannmasoch @twostraws Display refresh rate is not the same thing as camera-to-display latency. Even a 1000000Hz display would make you dizzy if it took 100ms to reflect the state of the outside world

1

0

28

Dmitry Grinberg

@dmitrygr

1 year

@averyhatestwt @legitleavitt @the_transit_guy Apple MAKES you come to the office. THAT induces demand, not the existence of a garage. Trust me. Nobody is there just to experience the amazing garage!

1

0

27

Dmitry Grinberg

@dmitrygr

3 months

Come read this in a few hours :)

Introducing the RP2350 - Dmitry.GR

Dmitry.GR: Everything you ever dreamed the RP2040 would be is here - fall in love with the RP2350

dmitry.gr

5

2

28

Dmitry Grinberg

@dmitrygr

9 months

@shuttle_dev First of all, system programming is in C and not C++ (excepting iokit). Second of all, C has outlived plenty of “X will replace C”. It’ll outlive this one too. Most people’s masochism itch is scratched enough by bad datasheets - they don’t need a naggy compiler too.

4

2

28

Dmitry Grinberg

@dmitrygr

4 years

Segment eInk driven by an entirely undocumented (and now reverse-engineered) samsung #sem9110

1

27

Dmitry Grinberg

@dmitrygr

2 months

The most common question I get that is not directly related to one of my projects is why my site does not have an RSS feed. Well, now it does.

1

0

26

Dmitry Grinberg

@dmitrygr

1 year

@mattjay Why would such photos need to exist? When I was getting surgery done on my nose, they attempted to take some photos. I said no. They said they always do. I said “that is a fascinating story, and you should consider an adaptation for the stage.”

0

1

26

Dmitry Grinberg

@dmitrygr

2 years

@jmtame You don’t stick this into a computer. You stick the end into a USB c cable. It then acts like a serial port and you can log into Linux running on it

1

2

25

Dmitry Grinberg

@dmitrygr

3 months

@agent_duckman @medus4_cdc @defcon They never approved anything, never asked to, I don’t believe they ever tested anything. The last change I made for them was broken. I made it at a time when I couldn’t do testing and I asked them to. That change was responsible for saves not working until I pushed a fix today.

2

0

25

Dmitry Grinberg

@dmitrygr

2 years

No optimizations yet, but we have first boot!

3

1

25

Dmitry Grinberg

@dmitrygr

4 years

The write up about using e-Ink price tags as picture frames is complete!

Hacking eInk Price Tags - Dmitry.GR

Dmitry.GR: Wireless picture frames that run for years on batteries

dmitry.gr

1

4

25

Dmitry Grinberg

@dmitrygr

1 year

This takes two minutes of realtime to generate and draw on the #rp2040 . Timelapsed to save you the time. It is a different image each time - algorithmically generated.

0

4

24

Dmitry Grinberg

@dmitrygr

3 months

Hey everyone, the new dumb AI hardware eWaste just dropped.

Avi

@AviSchiffmann

3 months

introducing friend. not imaginary. order now at

4K

1K

13K

2

1

25

Dmitry Grinberg

@dmitrygr

2 years

And this is ULTRIX 4.5 booting on my actual business card, as promised. Article update coming soon.

3

1

21

Dmitry Grinberg

@dmitrygr

2 years

An early build of a fully flashable PalmOS 5.2.8 upgrade for the dell AximX3. rePalm supports old devices too :)

3

1

24

Dmitry Grinberg

@dmitrygr

1 year

@dieworkwear If only there was some way a majority of people could work from some other location. If only a way existed to do video calls and remotely access machines. We could save hours of commutes and a lot of CO2. We could call it “work from home”. What a world that would be…

1

24

Dmitry Grinberg

@dmitrygr

2 years

I don’t want to live on this planet anymore. While some of us work hard to give you faster OSs and libraries, optimizing every corner of your kernel, others of us do…this…

Wes Bos

@wesbos

2 years

Node 20 allows you to compile your app into a single executable along with the entire Node.js core so you can run your apps on systems where node isn't installed, or your don't trust the system version.

170

790

6K

2

7

24

Dmitry Grinberg

@dmitrygr

9 months

@ENiKS_CZ @SergioRocks “Limited distractions” Tell me you have never stepped foot in an office without saying those words 🤣🤣🤣

0

24

Dmitry Grinberg

@dmitrygr

3 months

I am under no NDAs. Here is one of the early emails. Project is clearly described as risky and very time-constrained, with many possible things that can go wrong and cost more money. (I am on this email chain, so no NDAs are broken here) <defcon-email-1.png>