2 layers75.2 × 80.4 mm
TRS-80-M3-VID1
maboytim/TRS-80_Display_Adapter
Display board and CRT replacement for TRS-80 Models 3 and 4 and the big Tandy's.
26 parts12Unlicense
2 layers75.2 × 79.2 mm
TRS-80-M3-VID2
maboytim/TRS-80_Display_Adapter12Display board and CRT replacement for TRS-80 Models 3 and 4 and the big Tandy's.
- Size
- 75.2 × 79.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 63
- Pads
- 178
- Tracks, vias
- 194, 21
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 21 Nov 2022
- Updated
- 4 Oct 2025
Overview
TRS-80-M3-VID2 is an open-source printed circuit board by maboytim, from the maboytim/TRS-80_Display_Adapter repository on GitHub, published under the Unlicense licence. It is a 2-layer board of 75.2 × 79.2 mm with 27 parts on 63 nets, routed with 194 tracks and 21 vias.
It is built around the 74LVC125AD, MCP3201-CI/P and L7805. Its parts include 7 capacitors, 7 connectors, 5 resistors and 4 ICs. It belongs with the lEDs and displays boards of this library.
Main components
3
74LVC125AD
SOP-14L-40℃~+125℃ 1 1.65V~5.5V 2.6ns@5V,15pF 4 40uA 50mA 50mA 74LVC Schmitt trigger Tri-State Unidirectional SOP-14L Buffers, Drivers, Receivers, Transceivers ROHSMDDBuffers, Drivers, Receivers, Transceivers
MCP3201-CI/P
PDIP-8-40℃~+85℃ 0.5LSB 1 100kHz 12 2.7V~5.5V 2LSB 500nA 800kHz、1.6MHz External External SAR SPI Yes PDIP-8 Analog to Digital Converters (ADC) ROHSMicrochip TechnologyAnalog To Digital Converters (ADC)
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdTRS-80_Display_Adapter
Display board and CRT replacement for TRS-80 Models 3 and 4 and the big Tandy's.
Overview
The adapter board connects to where the the display board normally connects. It converts the video signals to HDMI or VGA so a modern monitor can be used instead of the builtin CRT. The adapter uses a low cost (~$15) Nano-9k FPGA module.
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_3mm_Pad_Via | H1, H2, H3, H4 |
| 3 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6, R7, R10 |
| 2 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C6 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8, R9 |
| 2 | 1u | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C3, C4 |
| 1 | 10u | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5 |
| 1 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7 |
| 1 | 5V | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | 74LVC125 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U2 |
| 1 | AudioJack3 | Connector_Audio:Jack_3.5mm_CUI_SJ1-3535NG_Horizontal | J8 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J7 |
| 1 | L7805 | TRS-80-M3-VID:78XXL | U3 |
| 1 | MCP3201 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4 |
| 1 | Tango_Nano_9K | TRS-IO-M1:DIP-48_W22.9mm | U1 |
| 1 | Test | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | Test8 | Connector_PinSocket_2.54mm:PinSocket_2x08_P2.54mm_Vertical | J4 |
| 1 | VIDEO IN | TRS-IO-M1:TRSVID10 | J1 |
| 1 | Video | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J6 |
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Questions
How big is the TRS-80-M3-VID2 PCB?
It measures 75.2 × 79.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TRS-80-M3-VID2 use?
27 parts, built around the 74LVC125AD, MCP3201-CI/P and L7805. 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 TRS-80-M3-VID2 KiCad files?
From the maboytim/TRS-80_Display_Adapter repository on GitHub, at the commit this page was made from: the board is kicad/TRS-80-M3-VID2/TRS-80-M3-VID2.kicad_pcb and its schematic kicad/TRS-80-M3-VID1/TRS-80-M3-VID1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TRS-80-M3-VID2 design in my own project?
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).