Differences

This shows you the differences between two versions of the page.

--- keyboard:nabu_kbd-2 [15 Dec 2023 19:26] – inebriated_duck
+++ keyboard:nabu_kbd-2 [02 Feb 2024 19:06] (current) – ported my sections from DT wiki, also corrected some wrong information about the keyboard delta_research
@@ Line 4: / Line 4: @@
 |  **Nabu KBD-2**  ||
 | {{:keyboard:nabu_pc.png?400|}}||
-| **Switch** | [[switch:Alps SKCC cream, Alps SKCC lock|Alps SKCC]] |
+| **Switch** | [[switch:alps_skcc_cream|Alps SKCC Cream]] |
 | **Sense method** | Contact |
-| **Protocol** | serial rs422 |
+| **Protocol** | Serial (RS422) |
 | **Keycaps** | [[terminology:Doubleshot|Doubleshot ABS]] |
@@ Line 14: / Line 14: @@
 ==== Description ====
 The keyboard bears a distinctive charcoal colour and "Nabu Personal Computer" sticker in the top right corner next to various function stickers.
-The series, as far as is known, shares the same construction. The keyboard uses Alps SKCC cream switches, with a latching switch located below the Caps Lock key. A 6 pin DIN connector is used to connect to the Nabu PC, with 2 additional DB9 ports located on the rear of the keyboard for optional joysticks.
+The series, as far as is known, shares the same construction. The keyboard was bundled with the Nabu Personal Computer System. The keyboard uses Alps SKCC cream switches, with a latching switch located below the Caps Lock key. A 6 pin DIN connector is used to connect to the Nabu PC, with 2 additional DB9 ports located on the rear of the keyboard for optional joysticks.
 ====Construction====
-===Case and internals===
+===Case===
-The keyboard case is a two piece, injection molded plastic shell that is held together by 6 countersunk screws that screw directly into the plastic of the top housing. Within the housing assembly, a further 4 screws at the distal left and right of the keyboard are used to secure the metal switch mounting plate to the top housing. The PCB consists of 2 parts: the keyboard matrix section which is held in place only by the switches soldered into it, and the interface section bearing the processing components and connection ports. The sections are connected by a ribbon cable. No manufacturer markings
+The keyboard case is a two piece, injection molded plastic shell that is held together by five counterbore screws with washers, and one countersunk screw. The screws are screwed directly into the top case. Within the housing assembly, a further 4 screws at the distal left and right of the keyboard are used to secure the metal switch mounting plate to the top housing. The bottom case has a label indicating the batch, revision, and serial number of the keyboard.
+===Internals===
+A SKCC Lock switch is present on the "CAPS" key. The SKCC Cream switches are infilled with a sort of resin or glue in the switch terminal recess. They are the black switchplate variant, likely manufactured around 1982 using IC dating.
+The switches are soldered to a PCB and clipped into a painted black steel plate on one side. The switch-plate assembly is then secured to the bottom half of the case with double-sided foam tape. The adhesive from the tape corrodes the steel plate over time, and the corrosion is present on NOS (new old stock) units. There are four slots for screws present on the plate; however, these are not used in the keyboard.
+The PCB is connected to the controller board through a ribbon cable that is soldered in. The controller on the keyboard is a Motorola MC6803P.
+There is a female DIN-6 connector present on the back side of the keyboard labeled "TO COMPUTER," along with two DB-9 joystick ports labeled "CONTROLLER" with a number below each port. All of the ports are soldered onto the controller board. Pins one and six are unused on the DIN-6, pins two and three for power, and pins four and five for data. The shield is connected to ground.
+The keyboard is 2KRO, and repeats keys when they are held down continuously. However, special keys do not autorepeat, such as the arrow keys. They instead only send one signal when depressed or released.
 ===Keycaps===
 The keycaps are manufactured by Alps Electric in a distinctive spherical sculpt. All keycaps are doubleshot ABS, with the majority being white on black. The "Pause", "TV" and "Go" keys are red, yellow and blue on black doubleshots, respectively. All keycaps are textured at the top with smooth sides.
-{{tag>wip keyboard:sense-contact keyboard:NABU keyboard:RS422 keyboard:keycaps-doubleshot keyboard:oem-unknown}}
+{{tag>wip keyboard:sense-contact keyboard:NABU keyboard:RS422 keyboard:protocol-serial keyboard:keycaps-doubleshot keyboard:oem-unknown}}