MOBO
About the MOBO PCB
MOBO is an open source PCB design by lkesteloot, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 74.9 × 114.3 mm, with 40 components from 23 distinct parts.
Other key parts include the VGA_daughter_board, Propeller_P8X32A-D40, 24LC256, Propeller_Plug and MiniM4-D40. By type, the board carries 16 resistors, 7 ICs, 5 capacitors, 3 connectors, 2 switches and 2 diodes.
From the project
Website documenting a hardware project from the 1990s.
This is the third model of the Alice machine. It runs a silicon Z80 with two co-processors: an ARM for keyboard, disk, and serial port, and a Propeller for video.
The 80MHz Propeller has 48K of internal RAM, drives VGA and the 5-pin Aux connector (intended for audio but wired generically to 3 Propeller pins) and thus provides opportunities for video and other experimentation.
Main components on the MOBO
MOBO bill of materials (BOM)
40 components, 23 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | VGA_daughter_board | Pin_Header_Straight_1x14 | U2 |
| 1 | Propeller_P8X32A-D40 | DIP-40_W15.24mm | U3 |
| 1 | 24LC256 | DIP-8_W7.62mm | U4 |
| 1 | Propeller_Plug | Pin_Header_Angled_1x04 | U5 |
| 1 | MiniM4-D40 | DIP-40_W15.24mm | U6 |
| 1 | Z80CPU | DIP-40_W15.24mm | U8 |
| 1 | KM681000BLP-7 | DIP-32_W15.24mm | U9 |
| 1 | 5 MHz | Crystal_HC50-U_Vertical | Y1 |
| 1 | SD_Card | Pin_Header_Straight_1x10 | CON1 |
| 1 | CONN_01X05 | Pin_Header_Angled_1x05 | P1 |
| 1 | CONN_01X01 | Pin_Header_Straight_1x01 | P2 |
| 4 | 1pin | 1pin | HOLE1, HOLE2, HOLE3, HOLE4 |
| 1 | RESET | SW_PUSH_SMALL | SW1 |
| 1 | SOFT RESET | SW_PUSH_SMALL | SW2 |
| 1 | POWER | LED-5MM | D1 |
| 1 | DEBUG | LED-5MM | D2 |
| 1 | 1000 µF | C_Radial_D8_L11.5_P3.5 | C1 |
| 3 | 0.1 µF | C_Disc_D6_P5 | C2, C4, C5 |
| 1 | 10µF | C_Radial_D5_L11_P2.5 | C3 |
| 2 | 100 | Resistor_Horizontal_RM10mm | R1, R2 |
Show 3 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 8 | 10k | Resistor_Horizontal_RM10mm | R3, R4, R11, R12, R13, R14, R15, R16 |
| 4 | 68K | Resistor_Horizontal_RM10mm | R5, R6, R7, R8 |
| 2 | 1k | Resistor_Horizontal_RM10mm | R9, R10 |
MOBO design files
The KiCad project lives in the lkesteloot/alice repository on GitHub; these links point at the commit this page was built from.
MOBO: common questions
How big is the MOBO PCB?
The MOBO measures 74.9 × 114.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the MOBO?
40 components, from 23 distinct parts. The full bill of materials is listed on this page.
Where can I download the MOBO design files?
From the lkesteloot/alice repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the MOBO design in my own project?
Yes, under the terms of its Apache-2.0 license, which lkesteloot chose for the repository.
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