BTC 51 series

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BTC 51 series
Packard Bell 5149 -- front.jpg
FCC ID E5XKBM111
E5XKBM10140
E5XKBM10510
Manufacturer BTC
Layouts Focus layout, ISO, ANSI
Keyswitches BTC dome with slider (PCB)
Interface AT, PS/2

BTC 51 series is a series of conductive BTC dome with slider keyboards from BTC.

Series

Confirmed models according to the user's guide are 5139, 5149 and 5169; 5140 is included for convenience, and the exact scope of this series is not known for certain. Model 5139 is not to be confused with the totally different BTC 5139 series. Three separate FCC IDs have been found associated with keyboards in this style.

Description

The case features a subtle reverse curve to the case. As such, not all model numbers fit this pattern.

The keycaps are made of thin ABS and have laser-etched or pad-printed legends. The profile is similar to Signature Plastics DCS family profile, but different to SP's keys on the inside. Although the key stems are Cherry MX mount, the stabilised keys (2 unit and larger) are not compatible with Cherry MX stabilisers. The series uses a 1.5 unit Esc key.

Variants

5139

Focus layout.

5139 E5XKBM111

5139 E5XKBM10140

The model number is not written on this keyboard. The PCB is marked "5139", but then so is the 5149. The layout however is identical the the normal 5139. The similarity in production dates between the PCB and IC suggest high production volume. This keyboard is from 1996.

5140

"5140" is the most confusing model number, as it relates to different layouts, eras and connectors. The 5140 number was also used for the Packard Bell 5140M (FCC ID E5XKBM104M10U), a more modern style keyboard of unknown construction but with the same reverse curve shape.[1]

ISO version

ISO; PCB marked BTC 5140/7131/7931. FCC ID: E5XKBM10510. The controller is a BTC-marked UM6868A-0021. All keycaps are beige. Windows keys.[Citation needed]

Focus layout version

104-key Focus layout with Windows keys and AT plug. FCC ID is E5XKBM10140; date is not known but it will be 1995 or later.

5149

ISO layout; PCB and controller chip are marked "5139". This version has been found to suffer from ghosting; normally, potential ghosts are blocked, but playing Tyrian Destruct with two-player keyboard sharing revealed a flaw where a ghost could be emitted, requiring player 2 to use the alternative set of keys.

5169

This is a rare version of which little is known. It has been found with Wyse branding and colours in ANSI layout, with Wyse part number 770180-01 (where -01 is reported to indicate US layout).[2] The FCC ID of this version is E5XKBM111.

Documentation

References

  1. Recycled Goods — Packard Bell 5140M - Keyboard PS/2 connector (120305-01)
  2. geekhack — Can anyone tell me if this board is mechanical and/or what kind of switches?