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The IBM 7690 is a clinical computer that folds into itself. It was designed for mounting on a wall.
Strangely, there is little information on the internet about this product.
There is a PubMed abstract on this computer:
Witkowski JA. Microcomputers in nursing practice: IBM 7690 clinical workstation, Part I. J Pediatr Nurs. 1992 Apr;7(2):147-8.
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The first hospital based Tablet I saw was the Zenith CruisePad -- it basically was a remote client as you required a Windows NT server to serve up the applications.
Zenith Data Systems CruisePad
Thin Client, Windows 3.1, (1995)
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Thin clients then came along -- and this was another way to serve up applications from a more powerful server class machines.
Thin clients also allowed more control of the desktop environment in terms of viruses and non-approved applications (and even usb keys)
Virtual Desktop, 1280x1024 (1999)
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HP NeoWare e370 Thin Client / eFusion Cart
17 inch, Windows XP Embedded, 1ghz, 512mb flash memory (2006)
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The old TDS 7000 Oscar system at the Foothills Medical Centre (FMC) used light pens instead of mice. Light pens only work with CRT monitors -- so since the world has gone to LCD screens they are no longer in use.