maboytim/TRS-80_Model3-4_Keyboard-Display-Adapter18FPGA based Interface to replace the keyboard and/or CRT display of a TRS-80 Model 3 or 4 with a PS2 keyboard and VGA or HDMI monitor.
TRS-80-M3-KEY is an open-source printed circuit board by maboytim, from the maboytim/TRS-80_Model3-4_Keyboard-Display-Adapter repository on GitHub, published under the Unlicense licence. It is a 2-layer board of 89.5 × 86.4 mm with 32 parts on 76 nets, routed with 367 tracks and 26 vias.
It is built around the 74LVC125AD and SN74LVCH8T245PW. Its parts include 10 resistors, 6 capacitors, 6 connectors, 4 ICs and 1 transistor. It belongs with the interfaces and adapters and keyboards and input boards of this library.
FPGA based Interface to replace the keyboard and/or CRT display of a TRS-80 Model 3 or 4 with a PS2 keyboard and VGA or HDMI monitor.
The adapter can be used to replace the keyboard of a TRS-80 Model 3 or 4 computer with a PS2 keyboard and/or the CRT with a VGA or HDMI monitor. The adapter uses a low cost Nano-9k FPGA module to simulate the keyboard matrix and to capture and reformat the video signal.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 200 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4, R5 |
| 4 | MountingHole | MountingHole:MountingHole_3mm_Pad_Via | H1, H2, H3, H4 |
| 3 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3 |
| 3 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8, R9, R10 |
| 3 | 10u | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C6, C7, C8 |
| 2 | 2K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6, R7 |
| 1 | 2N2702 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | 74LVC125 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U3 |
| 1 | Keyboard | Connector_PinHeader_2.54mm:PinHeader_2x10_P2.54mm_Vertical | J1 |
| 1 | LD1117DT18TR | Package_TO_SOT_SMD:TO-252-3_TabPin2 | U5 |
| 1 | Mini-DIN-6 | TRS-80:minidin_6_ps2_pcb_mount | J3 |
| 1 | Power | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | R 1kx8 | Connector_PinSocket_2.54mm:PinSocket_1x09_P2.54mm_Vertical | RP1 |
| 1 | SN74LVCH8T245 | Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm | U2 |
| 1 | Tango_Nano_9K | TRS-IO-M1:DIP-48_W22.9mm | U1 |
| 1 | Test | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | VGA | TRS-IO-M1:DB_15F-VGA | J4 |
| 1 | Video | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal | J2 |
crgarcia12/electronics-homeassistant-lightscontroll
A smart lighting controller PCB that integrates seamlessly with ESPHome and Home Assistant while maintaining full compatibility with traditional mechanical switches.
apuder/TRS-IO
TRS-IO gives a TRS-80 Model 1/III online capabilities and provides access to a variety of services. TRS-IO currently features the following capabilities:
Shank-Mods/Wii-BVM-Card
A simplified version of the BKM-129X compatible board.
ghent360/PrntrBoard
3D Printer controller board using STM32 NUCLEO-F446 kit TMC2130/2660/2209 drivers
tehKaiN/plipUltimate
Network interface & SD card reader for Classic Amigas
maboytim/TRS-80_Display_Adapter
Display board and CRT replacement for TRS-80 Models 3 and 4 and the big Tandy's.
It measures 89.5 × 86.4 mm and has 2 copper layers, 1.6 mm thick.
32 parts, built around the 74LVC125AD and SN74LVCH8T245PW. 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.
From the maboytim/TRS-80_Model3-4_Keyboard-Display-Adapter repository on GitHub, at the commit this page was made from: the board is kicad/TRS-80-M3-KEY/TRS-80-M3-KEY.kicad_pcb and its schematic kicad/TRS-80-M3-KEY/TRS-80-M3-KEY.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the Unlicense licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).