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IBM Convertible 5140

The image is clickable

1986.

IBM Convertible 5140 was not the first portable computer that IBM introduced. A few years earlier came, for example, the also "portable" IBM Portable PC, a rather unwieldy piece. Convertible 5140 was the first from IBM that was battery-powered, but also the first with built-in 3,5" disk drives.

The convertible model was indeed convertible. You could build on the back with different modules such as a printer. They were simply joined to the computer itself (the printer modul is still missing in the museum!). In addition, there was an adapter with parallel and serial connectors, and a CRT adapter for external display, which gave much better picture than the built-in, somewhat low-contrasted LCD screen. Its own LCD screen could even be removed, if you wanted to convert on it to the max. With all enlargement it became some unhandy in transport, wheter you is carrying the parts separated.

Hard drive was missing, but there were two disk drives, which in a bright way was angled up from the closed, flat computer, when you opened up the screen (see images). On one of the disk drives you run the programmes, as was customary, and on the other one the documents was stored. The computer did not stop if you did not boot up by a disk. What happened was that it read in BASIC instead, and you could run that programming language.

Is there any errors? e-mail and correct me!

 

 

Former owner: Anders Johansson, Västerås

Technical data

 
Year 1986
Origin USA
Manufacturer IBM
Name Convertible 5140
CPU Intel 80C88
Speed 4,77 Mhz
OS MS-DOS
ROM 64 KB
RAM 256 KB max 512 KB
I/O ports  
Text modes 80 x 25
Graphic modes 640 x 200
Colours  
Sound Beep
Built in media 720 KB 3,5" disk drive x 2
Power supply Adapter