Thelio Spark B1-N2 (#219)

* thelio-spark-b1-n2: Add specs & external overview
* thelio-spark-b1-n2: Add repairs page
* thelio-spark-b1-n2: Add internal overview
* thelio-spark-b1-n2: Proofreading
    * Add port labels to external overview's top photo
    * Add missing table of contents links to repairs page
    * Add wireless card info to specs page
    * Tweak wording of CPU duct's interaction with top GPU/PCIe slot
    * Fix/update links between sections on repairs page
* thelio-spark-b1-n2: Address feedback
    * Correct header on internal overview page
    * Reflect screwdriver requirement for 2.5" drive cage
    * Rename CPU locking pin to CPU locking lever
    * Notate default orientation of CPU cooler mounting bracket
    * Correct molex connector to Berg connector for thelio-io-* boards

src/README.md

@@ -29,6 +29,7 @@ The source can be viewed [on GitHub](https://github.com/system76/tech-docs).
 - [Thelio Mega (thelio-mega-r1.0)](models/thelio-mega-r1.0/README.md)
 - [Thelio Mira (thelio-mira-b1.0)](models/thelio-mira-b1.0/README.md)
 - [Thelio Mira (thelio-mira-r3.0)](models/thelio-mira-r3/README.md)
+- [Thelio Spark (thelio-spark-b1-n2)](models/thelio-spark-b1-n2/README.md)
 
 ## Previous Models
 

src/SUMMARY.md

@@ -87,6 +87,10 @@
         - [External Overview](models/thelio-mira-r3/external-overview.md)
         - [Internal Overview](models/thelio-mira-r3/internal-overview.md)
         - [Parts & Repairs](models/thelio-mira-r3/repairs.md)
+    - [Thelio Spark (thelio-spark-b1-n2)](models/thelio-spark-b1-n2/README.md)
+        - [External Overview](models/thelio-spark-b1-n2/external-overview.md)
+        - [Internal Overview](models/thelio-spark-b1-n2/internal-overview.md)
+        - [Parts & Repairs](models/thelio-spark-b1-n2/repairs.md)
 - [Previous Models](README.md)
     - [Adder WS (addw2)](models/addw2/README.md)
         - [External Overview](models/addw2/external-overview.md)

src/models/thelio-spark-b1-n2/README.md

@@ -0,0 +1,82 @@
+# Thelio Spark (thelio-spark-b1-n2)
+
+- [External Overview](./external-overview.md)
+- [Internal Overview](./internal-overview.md)
+- [Parts & Repairs](./repairs.md)
+
+![Thelio Spark](./img/thelio-spark-b1-n2.webp)
+
+The System76 Thelio Spark is a desktop with the following specifications:
+
+- Chassis
+    - System76 [Thelio Spark chassis](https://github.com/system76/thelio/tree/ba8d6375083abb3145980f8522aa97ca6e9f08fb/Thelio%20Mira%5CSpark%20(nebula36)) based on nebula36-2
+- Processor options
+    - Supports Intel 12th Generation (Alder Lake) CPUs
+        - [Core i5-12400](https://ark.intel.com/content/www/us/en/ark/products/134586/intel-core-i512400-processor-18m-cache-up-to-4-40-ghz.html)
+        - [Core i5-12600K](https://ark.intel.com/content/www/us/en/ark/products/134589/intel-core-i512600k-processor-20m-cache-up-to-4-90-ghz.html)
+- Motherboard
+    - [ASRock B660M PRO RS](https://www.asrock.com/mb/Intel/B660m%20Pro%20RS/index.asp#Specification) running System76 Firmware (non-open)
+    - Intel B660 chipset
+- Daughterboard
+    - [Thelio Io](https://github.com/system76/thelio-io) board running [open-source firmware](https://github.com/system76/thelio-io-firmware)
+- Graphics options
+    - Up to two dedicated GPUs
+        - Primary GPU slot:
+            - PCIe 4.0 x16
+            - Up to 3-slot height
+                - Up to 2-slot height if PCIe x1 slot is in use
+        - Secondary GPU slot:
+            - PCIe 3.0 x16
+            - Up to 4-slot height
+    - GPU size:
+        - Internal clearance: 318.80mm
+        - Recommended maximum length: 308.80mm
+    - Tested with the following GPUs:
+        - Integrated Graphics
+            - 1x HDMI 2.1, 1x DisplayPort 1.4
+        - [AMD Radeon RX 7600](https://www.amd.com/en/products/graphics/amd-radeon-rx-7600#product-specs)
+            - 1x HDMI 2.1, 3x DisplayPort 2.1
+        - [NVIDIA GeForce RTX 4060 Ti](https://www.nvidia.com/en-us/geforce/graphics-cards/40-series/rtx-4060-4060ti/#specs)
+            - 1x HDMI 2.1, 3x DisplayPort 1.4a
+- Expansion
+    - 1x PCIe 4.0 x16 (primary GPU slot)
+    - 1x PCIe 3.0 x16 (secondary GPU slot)
+    - 1x PCIe 3.0 x1
+- Memory
+    - Up to 64GB (4x16GB) dual-channel DDR4 DIMMs @ 3200 MHz
+        - User-expandable up to 128GB (4x32GB) @ 3200 MHz
+    - Tested with the following RAM modules (may ship with other tested modules):
+        - [Crucial CT16G4DFRA32A](https://www.crucial.com/memory/ddr4/ct16g4dfra32a#spec) (16GB/stick)
+- Networking
+    - 1x 1-Gigabit Ethernet ([Intel I219-V](https://www.intel.com/content/www/us/en/products/sku/82186/intel-ethernet-connection-i219v/specifications.html))
+    - 1x PCI Express x1 wireless card ([Intel AX210](https://www.intel.com/content/www/us/en/products/sku/204836/intel-wifi-6e-ax210-gig/specifications.html))
+        - WiFi 6E
+        - Bluetooth 5.2
+- Power
+    - C13 power cord
+    - 600W PSU
+    - Tested with the following PSU models (may ship with other tested models):
+        - [Thermaltake Toughpower GX2 600W (80+ Gold)](https://thermaltakeusa.com/products/toughpower-gx2-600w-ps-tpd-0600nnfagu-2#tab-label-specification)
+- Sound
+    - Back: 3.5mm line out, line in, microphone jacks
+    - Top: 3.5mm line out, microphone jacks
+    - Up to 7.1-channel audio output
+    - Realtek ALC897 audio chipset
+    - HDMI, DisplayPort audio
+- Storage
+    - 1x M.2 2280/2260/2242 SSD
+        - PCIe NVMe Gen 4
+    - 1x M.2 2280 SSD
+        - PCIe NVMe Gen 3
+        - SATA III
+        - Intel Optane
+    - 2x 2.5" (15mm) SATA III
+- USB
+    - 1x USB 3.2 Gen 1 Type-C
+        - Top port
+    - 5x USB 3.2 Gen 1 Type-A
+        - 4x back ports, 1x top port
+    - 2x USB 2.0 Type-A
+        - Back ports
+- Dimensions
+    - 43.635cm × 25.3cm × 33.1cm

src/models/thelio-spark-b1-n2/external-overview.md

@@ -0,0 +1,28 @@
+# Thelio Spark (External Overview)
+
+## Back overview:
+
+![Back Ports](./img/ports-back.webp)
+
+### Power Switch Guide:
+
+- 0: Off
+- 1: On
+
+### PCI Express Slot Guide:
+
+The recommended PCIe slot configuration is:
+
+- Top slot (4.0 x16): Used for dedicated GPU (if ordered)
+- Middle slot (3.0 x1): Empty
+- Bottom slot (3.0 x16): Used for wireless card
+
+Cards can be moved into other compatible slots to accomplish different aftermarket configurations. Note that the wireless card may obstruct the GPU fans if placed in the middle PCIe slot (3.0 x1).
+
+## Front/side overview:
+
+![Front & Side Views](./img/ports-front-sides.webp)
+
+## Top/bottom overview:
+
+![Top & Bottom Views](./img/ports-top-bottom.webp)