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21 Feb, 43 tweets, 12 min read
So I've got a thing. It's a small LCD!
The back of it just has some japanese on it, which apparently says something like "don't pinch your fingers!"
Which is about this foldly flap. It doesn't open any more than this. It's a stand to let you put it on a surface.
And if you look on the side, there's a DC power port, a USB port, and a switch from "H" to "L".
Huh. Where's the VGA/DVI/HDMI/DP?
So it turns out there isn't any! This is an IO Data LCD-USB10XB-T-M, which is a monitor designed specifically for USB use.
It appears to have only been released in Japan, and the -T part of the model number means this is the touchscreen version. Fancy.
So this thing was discontinued in 2012, and apparently only supports XP/Vista/7.
Which is probably why it showed up in a junk store for 5$
Oh hey, a button! Maybe this is the power-on button?
Oh. That was not a button
Yeah this thing is a touchscreen, but it's a touchscreen from the era when you had to use styluses... it's a resistive touch screen!
Anyway USB-monitor that only works on XP/Vista/7 isn't terribly useful, so let's open it up. It's basically an LCD with a little metal box taped onto the back
The metal cover for the LCD says REV. 50209E10AC01RA. Nothing on google.
The touch screen is apparently a t101s-5rbb01n-0a11r0-055fh-c.
If we pull off the tape we can slide the box out, and here's the PCB!
This PCB was definitely designed to possibly have some other connectors on it. They seem to have 4 pins, so probably just more USB? Or maybe this display can have a built in USB hub?
the PCB says 794021200601R R1Q61AAA0HCC.
No results for either of those.
Nice of them to label the LCD cable.
It's an UW101G LCD Cable!
So our main chip is a DisplayLink DL-115.
This is a specialized chip for USB graphics, from DisplayLink.

This is the lowest-end version, which can't do DVI/CGA, and maxes out at 1024x600 pixels.
Next to it is some ram. It's a Hynix H5DU1262GTR, which is 16 megabytes of DDR ram.
And a Winbond 25Q128BVFG.
This is a 16 megabyte serial flash chip. This probably stores code or configuration info for the DisplayLink chip.
Over here is a Silicon Labs F321, which is a touch controller.
And that's not all...
The full name of the chip is the C8051F321!

Then there's an NEC 720114.
This is a USB hub chip, handling up to 4 ports.
I'm betting the reason this is here is because this device shows up as a hub with two devices attached, a DisplayLink display and a USB touchscreen "mouse"
Over here we've got an ST 93C66WP.
That's a 512 byte Microwire EEPROM. I'm not sure what this is for, or why it appears to be hooked into the switch.
Flipping the PCB, we've got a date: 2010/05/10, that 493... number again, and another model number: ILM-003.
The LCD is a completely distinct module.
It's a Chimei Innolux CBEQQ01V81P00G (nothing on google)
N101G-L0A (only a plane crash on google), V0C15161BE2000F (nothing on google), COCKN (I'm not going to google that)
There's no way "M$44-D052269-L$W911111111YC2685C" is gonna result in anything!
The manual and software is linked off this page:…

The manual is solely in Japanese, but apparently the H/L switch is just the brightness.
so mine didn't come with a power adapter, but I can probably find a matching adapter. I'll do that and get a USB cable and see if it works on win10!
DisplayLink in general has later revisions which do support windows 10 ,so it's entirely possible it will work, but they may have customized the USB drivers, then discontinued them, so they won't work.
Fun fact: the DC power jack it uses is compatible with the Imation SuperDriver power supply.
So I plugged it in, and the touchscreen works.
Not the display part, just the touchscreen?
So you can't see where you're clicking, but you CAN click.
but even weirder, it shows up as a CD-ROM DRIVE!?
to provide the drivers!
they don't work.
because they're from 11 years ago
but I can install the generic drivers for DisplayLink from DisplayLink, and maybe they'll work
Nope! This has apparently been an issue since 2017 and the DisplayLink people have been working on it but the suggested workaround doesn't seem to work for me. So nope, no display for me.
I plugged it into a linux machine and it detects it and it can in theory output to it... but it turns out there's a conflict that means the open source driver can't work on a system with nvidia drivers running.
Guess what my handy linux machine runs?
@vista_x64 suggested something I really should have thought about: USB passthru from an XP VM!
And yep, it works fine.
I attached the monitor, it automounted the CD, which installed the drivers, then the display turned on.
weirdly the touch screen doesn't work.
I'm not sure why, but I can tell it's trying to work, because it does break the VirtualBox tablet support
it doesn't have any noticeable latency either, over USB 2.0!

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23 Feb
stupid idea: A small 16bit DOS program that reads every sector of the hard drive in increasing order, and displays it on screen, in MDA or CGA 80x25 mode.
a sector is 512 bytes, so a 32x16 (plus another line for metadata) display can show the whole thing, and fits in any mode
and the purpose is: it's a stupid way to get data out of a PC.
Doesn't have serial? floppy? parallel? network? SCSI? modem? WHO CARES
if it has a display that do either of the basic IBM PC text formats, you can exfiltrate data by recording the screen with a camera
the main problem is that some of these characters look like each other which is going to make OCRing them off the screen not fun Image
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So the latest LGR Blerbs episode is on the Keypatch AT, an interesting mid-80s device to add functionality to early PC keyboards. I was thinking I had another model of Keypatch and I thought I should go pull it out of storage...

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Shout out to Google, one of the biggest software companies in the world, who can't properly size their buttons, so the "Download" button turns into "Down...ding" when you click it. Image
There are only three real problems in computer science:
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2. Cache invalidation
3. UI layout
(And of course, 4: off by one errors)
Read 4 tweets
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after not having seen my doctor all of 2020 and so far in 2021, you're gonna open up with THIS QUESTION? Image
I understand why they ask these questions but, like, I've got insomnia and ADHD and I'm on a bunch of stimulants and I've got digestive issues. they're basically asking "are you still foone?" [yes] [no] Image
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I haven't had coffee yet and I just woke up so only one of my eyes works and I saw this craigslist thumbnail and was like "ooh, what's that keyboard?" Image
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one of my favorite things about being someone who whines a lot on twitter about their computer problems and has a bad memory is that often when I hit a problem I vaguely remember hitting before, I just need to search my own tweets to figure out the solution
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it's not fully working because grub is trying too hard to put itself into a graphical mode BUT I WILL STOP IT
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