JM-01

rev E · wearable cyberdeck concept

39.8 × 22.6 × 5.2 cm packed arch left, grip bay right ≈ 1.85 kg, estimated

about ↗

Type on your keyboard to use its shell; ↑ ↓ turn the knob through history. Click the toggles.

Parts

Inside

Raspberry Pi Compute Module 5, 8 GB, face-down on a slim carrier with a 2230 NVMe SSD, under the screen, its connectors facing the back edge
Two flat LiPo pouch cells (~70 Wh, 15 mm stacked) in a rigid tray with room to swell, BMS and fuel gauge, under the screen
UPS and USB-C charging board, under the vents on the right
Keyboard PCB with a QMK controller, which also reads the thumbstick (two analog axes and a click) as a mouse
1.02 in e-ink status panel on the CM5's SPI bus, which it shares with the LoRa module; about 1 mm thick, it sits just under the top shell
No USB hub: the carrier's two USB 3 ports go to the back sockets, its two USB 2 ports to the keyboard and the SDR
RTL-SDR v4 dongle, SMA end facing the back jack
SX1262 LoRa module on the GPIO pins (SPI) for Meshtastic, next to the antenna swivel
Two display driver boards, one per bar screen; the lid's ribbon runs through its hinge. The lower screen is on micro-HDMI 0 and the lid screen on the CM5's spare MIPI DSI port, so the back HDMI keeps its own output. Still to confirm: if the CM5 can't drive all three at once, the lid screen and the back HDMI share one
WM8960 audio codec (speaker, mic and the voice radio's audio), and the slim 40 × 20 mm speaker facing the front grille
SA818 70 cm voice module under the palm rest; PTT and its settings on GPIO pins, coax to the left whip
Flat 30 mm blower aimed at the back vents, on the carrier's fan header so its speed follows the temperature
microSD extension and power-button lead from the carrier to the back edge
RTC coin cell (20 mm), and short panel-mount leads to every port, with a 2 cm strip behind the back edge kept clear for their jacks

Spec

Compute: Raspberry Pi Compute Module 5, 8 GB, on a slim carrier with an NVMe SSD
Display: Two 8.8 in IPS bars, 1920×480 each, 1920×960 together: the lower one tilts up 22°, the second is in the lid and stands above it. Plus a 1.02 in e-ink status panel (128 × 80) behind the knob
Input: 60% low-profile; a sealed thumbstick on the left, with three click buttons under the space bar; rotary knob
Radio: LoRa 868/915 MHz on the right whip; 70 cm voice, 1 W, push-to-talk and APRS, on the left whip; RTL-SDR (receive only) on the back SMA jack
Wireless: The CM5's Wi-Fi and Bluetooth, on an external antenna tucked inside the plastic top shell, away from the aluminium
Ports: USB-A and USB-C (both USB 3, straight off the carrier), HDMI, Ethernet, USB-C PD in, SMA, 3.5 mm audio, microSD, Qwiic (I2C), power button
Audio: WM8960 codec, small front speaker, pinhole mic, 3.5 mm headset jack
Cooling: Aluminium bottom shell as heatsink, CM5 face-down on a thermal pad, 30 mm blower, intake under the front lip, exhaust through the back edge
Power: 2 LiPo pouch cells, ≈ 70 Wh (about 63 usable), under the 100 Wh carry-on limit. Estimated: ~7.5 h writing or browsing with the lid screen off, ~6 h with both screens on, ~5 h on the SDR or compiling, ~18 h as a screen-off mesh node. The voice radio draws ~5 W only while you hold the PTT
Kit: Neoprene rain sleeve
Size: 39.8 × 22.6 × 5.2 cm packed. A 2° wedge, thin at the front and a little taller at the back
Weight: ≈ 1.85 kg, estimated, with the lid screen, with a 2 mm aluminium bottom shell
Carry: Two-point sling, sideways across the back. Swing it round and a waist strap holds it level.

Concept model, written up on jeromem.dev. Rev E is rev D made thinner: the body itself is the wedge, with flat pouch cells and a Compute Module 5 inside. Rev D made the rev B croquis asymmetric: an arch handle over the controls on the left, an open grip bay on the right. Sizes, weight and runtime are estimates.