2 layers30.5 × 63.5 mm
Board nfz330 nfz400
fabio-d/minitel-native
Software and hardware tools to run native programs on the Minitel
24 parts10CERN-OHL-W-2.0
2 layers93.2 × 67 mm
Board 722039m
fabio-d/minitel-native10Software and hardware tools to run native programs on the Minitel
- Size
- 93.2 × 67 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 85
- Pads
- 215
- Tracks, vias
- 506, 50
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 4 Oct 2025
- Updated
- 4 Sep 2026
Overview
Board 722039m is an open-source printed circuit board by fabio-d, from the fabio-d/minitel-native repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 2-layer board of 93.2 × 67 mm with 24 parts on 85 nets, routed with 506 tracks and 50 vias.
It is built around the 23LCV512-E/P, SN74CB3T16211DL and 1N5819WS. Its parts include 6 capacitors, 6 resistors, 3 ICs, 2 connectors and 1 diode.
Main components
3
23LCV512-E/P
PDIP-8-40℃~+85℃ 10mA 2.5V~5.5V 4uA 512Kbit SPI PDIP-8 SRAM ROHSMicrochip TechnologySRAM
SN74CB3T16211DL
BSSOP-56-300milBSSOP-56-300mil Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
1N5819WS
SOD-3231 Independent 1A 25A 40V 500uA@40V 600mV@1A SOD-323 Schottky Diodes ROHSGuangdong HottechSchottky Diodes
README
rom-emulation/board_722039m/README.mdAdapter board for 722039 M Minitels
This board supports the following Minitel models:
- Telic-Alcatel Minitel 12 (722039 M)
Note: the battery1-powered RAM chip is optional. If omitted (or if no batteries are installed), the Minitel will lose its address book and messages at every boot.
Bill of materials
- Surface mounted (included in the production files for PCB fabrication):
- U3: SN74CB3T16211 Bus Switch TSSOP (datasheet, LCSC/JLCPCB).
- Y1: 12 MHz Crystal (LCSC/JLCPCB).
- D1: 1N5819 Schottky diode SOD-323 (LCSC/JLCPCB).
- C1, C3: 1 µF Capacitor 0603 (LCSC/JLCPCB).
- C2, C6: 100 nF Capacitor 0603 (LCSC/JLCPCB).
- C4, C5: 30 pF Capacitor 0402 (LCSC/JLCPCB).
- R1, R2, R6: 8.2 kΩ Resistor 0603 (LCSC/JLCPCB).
- R3, R4, R5: 22 kΩ Resistor 0402 (LCSC/JLCPCB).
- Others (to be purchased and assembled separately):
- Raspberry Pico 2 or Raspberry Pico 2 W (RP2350 datasheet, Pico 2 datasheet, Pico 2 W datasheet).
- P8032AH microcontroller in DIP package (AliExpress).
- 40-pin DIP socket (AliExpress).
- Two 20-pin female headers (AliExpress).
- One 32-pin male header (AliExpress), or a longer one cut accordingly.
- And, optionally, for battery-powered RAM support:
- 23LCV512 SPI RAM in PDIP package (datasheet).
- 8-pin DIP socket (AliExpress).
Assembling the board
Solder the headers as shown in the pictures and populate the sockets with the corresponding chips.
Use solder to close bridges JP1 and JP2 in one of the ways shown below, depending on the clock configuration of the Minitel's original CPU board:
 Position 1-1: Use external clock |
 Position 3-3: Use on-board clock |
Choose position 3-3 only if the original CPU board has a crystal on it (see example pictures for what it looks like - note that it might be horizontal rather than vertical too). If no crystal is present in the original CPU board, choose position 1-1.
Installation
[!TIP] Some of the original design documents for this Minitel have been published at this page. The "M12 Description Technique 1988" file has a picture of the internal boards at page 18 and the original schematics at the end. The "Hardware M12" document has revised schematics that seem to better match the actual circuits in my Minitel.
Installation is straightforward: pull the original CPU board out of the main board and replace it with the new board.
Schematic
Pinout
Footnotes
-
The Minitel 12's battery slot is located under the display (two 1.5V AA) and easily accessible without disassembling. See page 4 of the Minitel 12 manual. ↩
Parts
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 22K | Resistor_SMD:R_0402_1005Metric | R3, R4, R5 |
| 3 | 8K2 | Resistor_SMD:R_0603_1608Metric | R1, R2, R6 |
| 3 | JLCPCB_PCBA_Tooling_Hole | MountingHole:ToolingHole_1.152mm | H1, H2, H3 |
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric | C2, C6 |
| 2 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C3 |
| 2 | 30pF | Capacitor_SMD:C_0402_1005Metric | C4, C5 |
| 2 | SolderJumper_3_Open | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2 |
| 1 | 12MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 1N5819WS | Diode_SMD:D_SOD-323 | D1 |
| 1 | 23LCV512 | Package_DIP:DIP-8_W7.62mm_Socket | U2 |
| 1 | 722039M_CPU_Port | Connector_PinHeader_2.54mm:PinHeader_1x32_P2.54mm_Vertical | J1 |
| 1 | P8032AH | Package_DIP:DIP-40_W15.24mm_Socket | U1 |
| 1 | RaspberryPico | ProjectFootprints:RaspberryPi_Pico_Common_THT | J2 |
| 1 | SN74CB3T16211 | Package_SO:TSSOP-56_6.1x14mm_P0.5mm | U3 |
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Questions
How big is the Board 722039m PCB?
It measures 93.2 × 67 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Board 722039m use?
24 parts, built around the 23LCV512-E/P, SN74CB3T16211DL and 1N5819WS. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Board 722039m KiCad files?
From the fabio-d/minitel-native repository on GitHub, at the commit this page was made from: the board is rom-emulation/board_722039m/board_722039m.kicad_pcb and its schematic rom-emulation/board_722039m/board_722039m.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Board 722039m design in my own project?
Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).