I understand you question to mean you would like a small PC to play with Mach3, and some programming software like CamBam, and such.
I just did a search for Tablet PC's, and Best Buy has a bunch of 10.1", touch screen tablets running Win 7, and Win8. Considering the huge market evolving with all the Android tablets, the PC tablets are slightly more $$.
Best Buy has one however, that sells for $413.00, and is a real PC, not an Android oversized phone. I am sure that these size devices have optional keyboards for number and letter entry. Sounds like a pretty cool little computer.
Here is the specs from their website.
Dell Latitude 10.1" Net-tablet PC - Wi-Fi - Intel Atom Z670 1.50 GHz - LED Backlight - Multi-touch Screen 1280 x 800 WXGA Display - 2 GB RAM - 32 GB SSD - Intel Graphics Media Accelerator 600 Graphics - Bluetooth - Genuine Windows 7 Professional (English) - HDMI
PRODUCT FEATURES
Processor Manufacturer: Intel
Processor Type: Atom
Processor Model: Z670
Processor Speed: 1.50 GHz
Processor Core: Single-core (1 Core)
vPro Technology: No
Cache: 512 KB
Standard Memory: 2 GB
Maximum Memory: 2 GB
Memory Technology: DDR2 SDRAM
Memory Standard: DDR2-800/PC2-6400
Memory Card Reader: Yes
Solid State Drive Capacity: 32 GB
Optical Drive Type: No
Screen Size: 10.1"
Screen Mode: WXGA
Display Screen Type: Active Matrix TFT Color LCD
Aspect Ratio: 16:10
Screen Resolution: 1280 x 800
Backlight Technology: LED
Touchscreen: Yes
Multi-touch Screen: Yes
Graphics Controller Manufacturer: Intel
Graphics Controller Model: Graphics Media Accelerator 600
Graphics Memory Accessibility: Shared
Wi-Fi: Yes
Wi-Fi Standard: IEEE 802.11a/b/g/n
Bluetooth: Yes
Bluetooth Standard: Bluetooth 4.0
HDMI: Yes
Front Camera/Webcam: Yes
Finger Print Reader: No
Operating System Platform: Windows
Operating System: Genuine Windows 7 Professional (English)
Operating System Architecture: 32-bit
Number of Cells: 4-cell
Form Factor: Slate
Height: 0.6"
Width: 10.6"
Depth: 7.3"
Weight (Approximate): 1.80 lb
Limited Warranty: 3 Year