Editing IBM Beam Spring Keyboards (section)

==3275 & 3277==

<gallery widths="250" heights="167">
File:IBM 3277 Beam Spring- keyboard profile.jpg | 66-key Typewriter layout
File:IBM 3277 66key Spanish.jpg | 66-key Data Entry layout
File:3277 1.jpg | 78-key Typewriter layout
</gallery>

The IBM 3275 and 3277 were the original terminals of the IBM 3270 Information Display System that launched in 1971. The IBM 3275 would attach to an IBM System/360 or System/370 via an IBM 2701 Data Adapter Unit, IBM 2703 Transmission Control or an Integrated Communications Adapter, and the 3277 would attach to an IBM 3271 or 3272 Control Unit<ref>http://www.bitsavers.org/pdf/ibm/3270/GA27-2739-1_An_Introduction_to_the_IBM_3270_Information_Display_System_May71.pdf</ref>. But otherwise, the two terminals shared the same basic keyboard designs. These beam spring versions of the keyboards are known as "Type B" by IBM, with "Type A" being the original [[Micro Switch SW Series]] based keyboards. The 66-key keyboard was available in keypunch-like data entry and typewriter layouts, whereas the 78-key was typewriter only. The 78-key was additionally available in an operator console variant with a layout based on the IBM 1052 Model 7 I/O Printer-Keyboard. These keyboards could have smooth or textured keycap tops depending if it was intended for world trade or not<ref>http://bitsavers.org/pdf/ibm/3277/S126-0005-2_3275_3277_Parts_Catalog_Mar76.pdf</ref>.