![](project_images/smallpc_images/tab710a.gif)
Why a dual-screen device?
Because dual-screen displays belonged always to my pet peeves.
This machine, the CDC 6600, was the ultimate paragon:
![](project_images/smallpc_images/CDC6600_Console1.gif)
(Source: Control Data Corporation)
Here are two operator consoles/service processors for mainframes, developed in the eighties:
![](project_images/smallpc_images/ce47.gif)
![](project_images/smallpc_images/ce41.gif)
![](project_images/smallpc_images/de01.gif)
The machines have been documented by courtesy of the Heinz Nixdorf MuseumsForum, Paderborn.
For details, see here ...
A small dual-screen / dual processor apparatus, belonging to a series of microcontroller modules developed from 2012 on.
![](project_images/smallpc_images/AIO2_03x.gif)
For an overview, see here ...
and here (a PDF with photos and block diagrams)...
With inexpensive 7" tablets, it was tempting to try again something similar:
![](project_images/smallpc_images/tab747a.gif)
All right, it is not a true dual-screen machine. The 19" 3 U subrack houses two independent 7" Windows tablets connected to a LAN switch, a USB switch, and a common power supply module. Additionally, each tablet has a USB hub and an R2S-232 interface.
![](project_images/smallpc_images/tab741.gif)
Modules, hubs, and interfaces:
![](project_images/smallpc_images/Tablets7_01b.gif)
Download this block diagram as PDF.
The principal power supply cabling:
![](project_images/smallpc_images/Tablets7_02b.gif)
Download this block diagram as PDF.
A first look inside:
![](project_images/smallpc_images/tab743.gif)
MORE ...
|