Editing Pertec XL40 keyboard

{{infobox dkeyboard
| image name   = Pertec XL40 top.jpg
| manufacturer = Pertec Computer Corporation (PCC)
| switch       = [[Micro Switch SD Series]]
| layouts      = QWERTY custom
| weight       = 2784g
| years        = 1977-1984
| keycaps      = [[Double-shot moulding]]
}}

==Description==
This is the keyboard for the Pertec XL40 microcomputer introduced in 1977. The XL-40 was also marketed by Triumph-Adler in Europe as TA1540 or Alphatronic P40. Pertec used Honeywell Hall Effect switches for this keyboard. These Honeywell Hall Effect switches are marked "4A3B", "4A3A" and "6A1D" for the stabilizers.

As usual the base of the switch housing reads "MICRO USA" but there is no Micro Switch sticker anywhere on the keyboard and no Micro Switch marking on the PCB suggesting Pertec manufactured their own PCB and bought the switches from Honeywell. This keyboard has a "tweeter", an internal speaker which makes a noise when typing on the keys. There are two main PCC labels, one on the backplate, one on the inside including a total of eleven different serial numbers on labels, stickers and the case itself. 

==Pertec XL40 Keyboard==
<gallery widths=250px heights=187px>
File:Pertec XL40 open.jpg        | Notice the unused area for a numerical block
File:Pertec XL40 PCB.jpg         | PCB
File:Pertec XL40 bottom case.jpg | Bottom part of the case
File:Pertec XL40 assembly.jpg    | The keyboard sits at an angle
File:Pertec XL40 label.jpg       | Pertec sticker
File:Pertec XL40 tweeter.jpg     | Beeper
File:Pertec XL40 keycaps1.jpg    | Micro Switch typical thick spherical doubleshots
File:Pertec XL40 keycaps2.jpg    | Detail keycaps
</gallery>


==Pertec XL40 replacement Keyboard==
This is a Pertec XL-40 replacement keyboard with brown instead of black doubleshots for the function keys. This keyboard also uses Micro Switch SD Series switches marked "4S1B" and "6A1D" for the stabilizers.
It is to be noted that a Micro Switch production sticker is present on this replacement keyboard while it is absent on the complete keyboard above! The date code reads "8415" placing it in the 15th week of 1984.

<gallery widths=250px heights=187px>
File:PPCXL40 repl front alt.JPG        | Plate extends to the right 
File:PPCXL40 repl switch detail.JPG    | Micro Switch SD series switches
File:PPCXL40 repl keycaps.JPG          | Spherical doubleshots details 
File:PPCXL40 repl PCB.JPG              | PCB
File:PPCXL40 repl sticker.JPG          | Micro Switch sticker on the plate
</gallery>


==Sperry Univac type 3555-00 keyboard==
This keyboard for the Sperry Univac type 3555-00 part of the 1900/10 mainframe appears to be very similair to both Pertec XL40 keyboards above. According to the labels this was also manufactued by Pertec using Honeywell 
(Micro Switch) components. The Micro Switch production date reads "7943" putting it in the third week of October 1979. While the command keys are blue doubleshots here the keyboard uses the same layout with [[Micro Switch SD Series]] switches 4A3B, 4A1B and 6A1D. Notice the markings on the "tweeter" are identical to those on the Pertec XL40 Keyboard.

<gallery widths=250px heights=187px>
File:Pertec XL40 blue setup.JPG                                     | Sperry Univac type 3555-00
File:Pertec XL40 blue close front.JPG                               | Blue function keys and black alpha keys
File:Pertec XL40 blue Numpad.JPG                                    | Empty numpad section identical to keyboards above
File:Pertec XL40 blue PCB Traces.JPG                                | PCB traces
File:Pertec XL40 blue Microswitch Label.JPG                         | Micro Switch label on the plate
File:Pertec XL40 blue Label.JPG                                     | Pertec label
File:Pertec XL40 blue Model Number.JPG                              | Pertec label "Add Mach. Univac"
File:Pertec XL40 blue Speaker.JPG                                   | Tweeter identical to above Pertec XL40 Keyboard
File:Pertec XL40 Blue Keycap Print 0.JPG                            | Blue doubleshot function key
File:Pertec XL40 Blue Keycap 0.JPG                                  | Blue doubleshot back
File:UP9100 Sperry Univac 1900 10 System Operators Guide Nov80.pdf  | Sperry Univac 1900 10 System Operators Guide PDF
</gallery>


==External links==
* Bitsavers — [http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/pertec Pertec documentation]
* Deskthority — [https://deskthority.net/keyboards-f2/pertec-computer-corporation-pcc-xl40-detachable-keyboard-t13334.html?hilit=pertec PPC XL40 keyboard review:]
* Wikipedia — [https://en.wikipedia.org/wiki/Pertec_Computer Pertec Computer]

[[Category:Pertec keyboards]]
[[Category:Keyboards with Micro Switch SD switches]]
[[Category:Vintage keyboards]]
[[Category:List of all keyboards]]