Editing IBM Beam Spring Keyboards (section)

==3276, 3278 & 3279==
<gallery widths="250" heights="147">
3276.jpg| 75-key Data Entry layout
File:3278 in the 87-key layout.jpg|87-key Typewriter layout (modified for modern use)
File:Green legends.jpg|87-key Typewriter layout with engraved green alternate legends<ref>https://deskthority.net/viewtopic.php?p=378718#p378718</ref>
File:3278 apl.jpg|87-key Typewriter layout APL tripleshot orange legends<ref>https://deskthority.net/viewtopic.php?p=310103#p310103</ref>
File:IBM-3279.jpg|75-key Operator Console version
</gallery>

The IBM 3276 and 3278 Display Stations were terminals first appearing in 1977 and intended for the System/370 and later series of IBM mainframes. 3276 and 3278 differed by 3276's inclusion of an integrated control unit<ref>http://www.bitsavers.org/pdf/ibm/3270/GA27-2851-0_3270_Information_Display_System_Description_Configuration_and_Physical_Planning_May77.pdf</ref>. The IBM 3279 was IBM's first color terminal that followed later in 1979. They shared the same basic pool of keyboards and associated part numbers<ref>bitsavers.org/pdf/ibm/3278/S126-0029-0_3276_3278_Keyboard_Assembly_Parts_Catalog_Jan83.pdf</ref>, available with 75 and 87-key layouts (76 and 88 for Katakana respectively) with different legends for a myriad of purposes including data entry (75-key only) and typewriter usage. IBM 3278 Model 2A (also written as "A02") and 3279 Model 2C were operator console versions of their regular terminals intended for IBM 43X1 series processors and had the same 24-line screen as the regular model 2s but the bottom 4 lines were reserved for CPU operations. They had a version of the 75-key keyboard with extra control buttons for the host processor's fundamental operations such as power and initial microcode loading (IML), status LEDs, and green "START" and red "STOP" keys. Additionally for 3279s, an "Attribute Select" version of the 87-key keyboard was available that added various unique legends to the 12-key bank for programmed symbols (PSA to PSF), extended highlighting ("a" with background, radial lines or underscore) and extended colouring (solid rectangular blocks of colour)<ref>http://bitsavers.trailing-edge.com/pdf/ibm/3278/GA33-3056-0_3270_Information_Display_System_Color_and_Programmed_Symbols_3278_3279_3287_Sep1979.pdf</ref>.