2 layers36.8 × 44.5 mm
Pontag
hkzlab/pontag
PONTAG is an active adapter that converts a mouse using PS/2 protocol into an RS232 mouse (Microsoft protocol), commonly used on IBM XT/AT and compatibles.
32 parts9
2 layers38.1 × 85.1 mm
Pontag
hkzlab/pontag9PONTAG is an active adapter that converts a mouse using PS/2 protocol into an RS232 mouse (Microsoft protocol), commonly used on IBM XT/AT and compatibles.
- Size
- 38.1 × 85.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 36
- Pads
- 143
- Tracks, vias
- 282, 10
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 2 Nov 2020
- Updated
- 22 Aug 2021
Overview
Pontag is an open-source printed circuit board by hkzlab, from the hkzlab/pontag repository on GitHub. It is a 2-layer board of 38.1 × 85.1 mm with 35 parts on 36 nets, routed with 282 tracks and 10 vias.
It is built around the ATMEGA328P-PU and MAX232N. Its parts include 11 capacitors, 7 connectors, 5 resistors, 5 diodes and 3 ICs. It belongs with the interfaces and adapters and retro computing and games boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA328P-PU
DIP-28-300mil-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH DIP-28-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
MAX232N
PDIP-160℃~+70℃ 120Kbps 2 2 4.5V~5.5V Transceiver PDIP-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs
README
README.mdPONTAG
Introduction
PONTAG is a board that converts a PS/2 mouse into a serial mouse that can be used on old IBM PC and clones, which lacked PS/2 ports but had plenty of serial interfaces (especially if expansion cards are installed).
Features & Limitations
- Supports 3 buttons+wheel PS/2 mouses and converts their protocol to RS232 serial usable on old PC systems.
- The board requires an external power supply between 8V and 12V to power the MCU and mouse
- Detects PS/2 mouses with wheel and without and notifies the user via LED (5 fast blinks for a normal mouse, 20 fast blinks for a mouse with wheel)
- Can be configured for various resolutions and mouse protocols by pushing mouse buttons
Configuration
The board can be configured during powerup by pressing the mouse keys. The configuration will be retained for all subsequent boots. To configure the board you must keep the mouse button pressed during a reset/bootup. A sequence of 15 slow blinks will notify the user of the accepted command, then the board will be reset with the new configuration.
- Left mouse button pressed: Switches between simple Microsoft protocol and Microsoft protocol with wheel (DEFAULT: MS+Wheel)
- Right mouse button pressed: Switches mouse resolution, switching between 1, 2, 4 or 8 counts per mm traveled (DEFAULT: 4 counts per mm)
- Both buttons pressed: Resets the board to defaults
Extra Header
The board supports some special options that can be toggled via external header, shorting the corrisponding pin to GND.
- Pin 1: The board will enter debug mode, and start printing debug strings on the serial port. It will NOT work as a mouse.
- Pin 2: If jumpered, the board enter power save mode after 3 minutes of mouse inactivity.
- Pin 3: If shorted, forces the use of the simple Microsoft protocol (2 buttons, no wheel), regardless of what is stored in the EEPROM.
- Pin 4: If jumpered, the board will skip the PS/2 intellimouse wheel activation sequence. (not exposed on board 1.0 !!!)
Supported protocols
PONTAG emulates a Microsoft 3-buttons Wheel serial mouse by default and transmits the 0x4D 0x5A 0x40 0x00 0x00 0x00 detection string when RTS signal is toggled.
The boards are tested with CuteMouse.
Credits
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 1.0uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C3, C7, C8, C9, C10, C11 |
| 3 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3 |
| 2 | 100nF | Capacitor_THT:C_Disc_D3.4mm_W2.1mm_P2.50mm | C5, C6 |
| 2 | 22pF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C2 |
| 2 | 5K | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R3, R4 |
| 1 | 10K | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R5 |
| 1 | 10nF | Capacitor_THT:C_Disc_D3.4mm_W2.1mm_P2.50mm | C4 |
| 1 | 12V Selector | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J1 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1 |
| 1 | 1N4001 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D4 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R2 |
| 1 | 5V Internal | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | JP2 |
| 1 | 8.0Mhz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | ATmega328P-PU | Package_DIP:DIP-28_W7.62mm | U3 |
| 1 | AVR-ISP-6 | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J5 |
| 1 | Btldr LED ENA | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | JP1 |
| 1 | External 12V | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | External 5V | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | Extra | Connector_PinSocket_2.54mm:PinSocket_2x06_P2.54mm_Vertical | J7 |
| 1 | L78L05_TO92 | Package_TO_SOT_THT:TO-92_Inline | U1 |
| 1 | LED | LED_THT:LED_D2.0mm_W4.8mm_H2.5mm_FlatTop | D5 |
| 1 | MAX232 | Package_DIP:DIP-16_W7.62mm | U4 |
| 1 | PS/2 Mouse | 4x1md_footprints:Connector_Mini-DIN_Female_6Pin_2rows | J4 |
| 1 | RS232 Port | Connector_Dsub:DSUB-9_Female_EdgeMount_P2.77mm | J3 |
| 1 | Reset | Button_Switch_THT:SW_PUSH_6mm | SW1 |
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PONTAG is an active adapter that converts a mouse using PS/2 protocol into an RS232 mouse (Microsoft protocol), commonly used on IBM XT/AT and compatibles.
31 parts9
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Questions
How big is the Pontag PCB?
It measures 38.1 × 85.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pontag use?
35 parts, built around the ATMEGA328P-PU and MAX232N. 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 Pontag KiCad files?
From the hkzlab/pontag repository on GitHub, at the commit this page was made from: the board is schematics_pcb/pontag-proto-00/pontag.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pontag design in my own project?
Its repository states no licence, so its author keeps all rights: ask hkzlab before reusing the design.