Telex 270 Keyboards

Telex 270 Keyboards
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FCC ID	None
Branding	Telex Computer Products Inc
Manufacturer	Telex Computer Products Inc
Layouts	3278
Keyswitches	Micro Switch SD Series
Keycaps	Double-shot
Interface	Parallel

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The "Telex 270 Keyboards" refers to a range of terminal keyboards used with the Telex Terminal Communications 270 terminal family; a clone of the IBM 3270 terminal family. These keyboards use Micro Switch SD Series hall effect switches and double-shot keycaps.

Description[edit | edit source]

The Telex 270 Information Display System is a line of terminals that are software and hardware compatible with the IBM 3270 family. The styling of the displays and keyboards followed that of their IBM counterparts. The 270 was designed as a lower cost solution. The keyboards achieved lower cost by using plastic case materials and Micro Switch SD Series switches.

Variants[edit | edit source]

Telex documentation indicates several keyboards were available with the different terminals in the 270 family. These included:<ref name="variant-list" />

For 276-2/-10

EBCDIC Typewriter w/ 24 PF Keys
EBCDIC Data Entry
EBCDIC Data Entry w/ Keypunch layout
EBCDIC Typewriter w/ Numeric Pad
EBCDIC Typewriter w/ Function Pad

For 275-2

EBCDIC Data Entry
EBCDIC/ASCII w/ Numeric Pad
EBCDIC Data Entry w/ Keypunch Layout
EBCDIC/ASCII w/ Function Pad
Operator Console or Check Processing
Upper/lower Case Character Set

For 277D

EBCDIC Data Entry
EBCDIC Data Entry w/ Keypunch Layout
EBCDIC Typewriter w/ Numeric Pad
EBCDIC Typewriter w/ Numeric Pad and 12 PF Keys
EBCDIC Typewriter w/ Program Function Keys
Operator Console or Check Processing
ASCII Typewriter w/ Numeric Pad
ASCII Typewriter w/ Function Pad

For 278-1/-2/-3/-4/-5

EBCDIC Typewriter w/ 24 Program Function Keys
EBCDIC Typewriter w/ 12 Program Function Keys
EBCDIC Data Entry
EBCDIC Data Entry w/ Keypunch layout
EBCDIC Typewriter w/ Numeric Pad
ASCII Typewriter w/ 12 Function Keys
ASCII Typewriter w/ Numeric Pad

Gallery[edit | edit source]

278 Typewriter with Numeric Pad[edit | edit source]

PN: 952003-222[edit | edit source]

The switches used are:

Code	Type	Usage
4B3E	Momentary stepped 2.5 oz 3-pin	All keys except space and numeric keypad zero
6B1D	Support (stepped) 1.1 oz dummy	Numeric keypad zero stabiliser (no keystem)
4B1E	Momentary stepped 1.1 oz 3-pin	Space bar, right-hand end
4B1D	Momentary stepped 1.1 oz dummy	Space bar, left-hand end