I have this old ProScan PLT7100G, it came with a mini-USB keyboard. But from day 1, the KB never worked, and I read you had to buy some code or firmware update, to allow KB usage.
Here's some spec's
PROSCAN PLT7100GK_JV 7" Dual-Core Tablet Features:
- Computer Type: Tablet
- Screen Size (Measured Diagonally): 7"
- Processor: 1GHz Dual Core Processor
- Memory: 512MB DDR3
- HDD: 4GB
- Input/Output: 1 Mini USB 2.0 Port, 1 Headphone Jack
- Speakers: Yes
- Battery Type: Rechargeable Built-In
- Internet Connectivity: 802.11 b/g
- USB Ports: 1 Mini USB 2.0
- Operating System: Android 4.4 Kit Kat
- Color: Black
- Includes: Tablet, Case, Keyboard, Owner's Manual
- Dimensions: 6.75"L x 10.5"W x 3.5"H
- Weight: 1.9 lbs.
- Display Size - Tablet: 7"
- Memory - Tablet: 512 MB DDR3
PROSCAN PLT7100GK_JV 7" Dual-Core Tablet Specifications:
Processor & Chipset
Processor Speed: 1 GHz
Processor Core: Dual-core (2 Core)
Memory
Standard Memory: 512 MB
Memory Technology: DDR3 SDRAM
Storage
Flash Memory Capacity: 4 GB
Optical Drive Type: No
Display & Graphics
Screen Size: 7"
Aspect Ratio: 15: 9
Screen Resolution: 800 x 480
Multi-touch Screen: Yes
Network & Communication
Wireless LAN: Yes
Wireless LAN Standard: IEEE 802.11b/g
Interfaces/Ports
Total Number of Mini USB Ports: 1
Built-in Devices
Sensor Type: Accelerometer
Front Camera/Webcam: Yes
Front Camera Resolution/Webcam Resolution: 300 Kilopixel
Software
Operating System Platform: Android
Operating System: Android 4.4 KitKat
So IDK anything about Android or Kitkat. But what might they have done, to block the KB. ? I can try hooking up the KB to my PC, or a scope or logic analyzer, to see what it might be doing. Not that I know much of anything about USB protocol.
I assume the KB works, but it's just deactivated in software on the tablet. IDK how easy it is to install new programs on this thing. Maybe it has to be hacked just to do that for all I know.
I just uploaded my 1st LED blinker code to a STM32F103, using a BusPirate, and Ardunio IDE. But to get to that point, I was using WireShark, and looking at what USB is doing.
I'm on Windows 10, and that's built to allow all kinds of stuff to run, like diagnostics. I know this tablet might not be like that.
Any thoughts ? I'm just learning some C++, but if all I had to do to unlock the USB keyboard, was change some registry setting with some software, I'd try it.