TRS-80 Color Computer 3
About the TRS-80 Color Computer 3 PCB
TRS-80 Color Computer 3 is an open source PCB design by qbancoffee, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 280 × 156.3 mm, with 205 components from 95 distinct parts.
Other key parts include the MC6809E, 27C256, SN74LS245N, W65C21N6TPG-14 and TCC1014. By type, the board carries 68 capacitors, 63 resistors, 20 ICs, 14 diodes, 9 connectors and 9 inductors.
From the project
This repository contains KiCAD schematics and board designs for the TRS-80 Tandy Color Computers.
This directory contains a KiCad project for the schematic for the TRS-80 Color Computer 3 model 26-3334.
Schematics are available in several locations including: https://colorcomputerarchive.com/repo/Documents/Manuals/Hardware/Color%20Computer%203%20Service%20Manual%20%28Tandy%29.pdf https://colorcomputerarchive.com/repo/Documents/Manuals/Hardware/Color%20Computer%203%20Revised%20Schematic%20%28Ty%20Sopko%29.pdf
Main components on the TRS-80 Color Computer 3
TRS-80 Color Computer 3 bill of materials (BOM)
205 components, 95 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MC6809E | DIP-40_W15.24mm_Socket | IC1 |
| 1 | 27C256 | DIP-28_W15.24mm_Socket | IC2 |
| 1 | SN74LS245N | DIP-20_W7.62mm_Socket | IC3 |
| 2 | W65C21N6TPG-14 | DIP-40_W15.24mm_Socket | IC4, IC5 |
| 1 | TCC1014 | PLCC-68_THT-Socket | IC6 |
| 1 | SC77526 | DIP-20_W7.62mm_Socket | IC7 |
| 1 | SC77527P | DIP-16_W7.62mm_Socket | IC8 |
| 1 | 74LS138 | DIP-16_W7.62mm_Socket | IC9 |
| 3 | 74LS244 | DIP-20_W7.62mm_Socket | IC10, IC11, IC12 |
| 1 | 74LS374 | DIP-20_W7.62mm_Socket | IC13 |
| 1 | 74LS30 | DIP-14_W7.62mm_Socket | IC14 |
| 1 | 74LS04 | DIP-14_W7.62mm_Socket | IC15 |
| 4 | TMS4464 | DIP-18_W7.62mm_Socket | IC16, IC17, IC18, IC19 |
| 1 | MC78L08_TO92 | TO-92_Inline | IC36 |
| 1 | 2N6123 | TO-220-3_Horizontal_TabDown | Q1 |
| 5 | 2SC1815 | TO-92L_Inline | Q2, Q3, Q5, Q6, Q7 |
| 1 | BCX38C | TO-92L_Inline | Q4 |
| 1 | 28.63636 MHz | XTAL_ECS-286.3-20-46X | X1 |
| 1 | Conn_02x20_Odd_Even | CARTRIDGE_CONNECTOR | CN1 |
| 1 | Conn_01x16_Female | PinHeader_1x16_P2.54mm_Vertical | CN2 |
Show 75 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Conn_02x05_Odd_Even | PinHeader_2x05_P2.54mm_Vertical | CN3 |
| 3 | Conn_01x12_Female | PinSocket_1x12_P2.54mm_for_memory_board_adapter | CN4, CN5, CN6 |
| 1 | Conn_01x03_Male | Molex_KK-396_A-41791-0003_1x03_P3.96mm_Vertical | CN7 |
| 1 | CVIDEO | KLPX-0848A-2-R | J5A1001 |
| 1 | SOUND | KLPX-0848A-2-R | J5B1001 |
| 1 | Left Joystick | CUI_SDS-60J | JK1 |
| 1 | Right Joystick | CUI_SDS-60J | JK2 |
| 1 | RS232 | CUI_SDS-40J | JK3 |
| 1 | Cassette | CUI_SDS-50J | JK4 |
| 1 | SolderJumper_3_Bridged12 | SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP1 |
| 1 | SolderJumper_2_Open | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP2 |
| 1 | 4.7k | R_Array_SIP10 | MP1 |
| 1 | 4.7k | R_Array_SIP9 | MP2 |
| 1 | CoCo3RFModulator | CoCo_3_RF_Modulator_rev_3_hdmi_mount | RF1 |
| 1 | J0971CS5VDC.45 | RELAY_J0971CS5VDC.45 | RY1 |
| 1 | SW_DPDT_x2 | F2UEE | SW1 |
| 1 | Reset Switch | B3F3152 | SW2 |
| 1 | SW3 | SW_EG1213 | SW3 |
| 1 | 10pF-50pF | C_Rect_L7.2mm_W7.2mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | TC1 |
| 2 | 1N5401-G | D_DO-201AD_P15.24mm_Horizontal | D1, D2 |
| 2 | UF1002-T | D_DO-41_SOD81_P10.16mm_Horizontal | D3, D4 |
| 6 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D5, D8, D9, D10, D11, D12 |
| 2 | 1N5228B-TAP | D_DO-35_SOD27_P7.62mm_Horizontal | D6, D7 |
| 2 | 1N4002 | D_DO-41_SOD81_P10.16mm_Horizontal | D13, D14 |
| 8 | — | FB_28L0138-10R-10 | FB1, FB2, FB5, FB6, FB7, FB8, FB9, FB10 |
| 1 | 1.8uH | L_Axial_L9.5mm_D4.0mm_P12.70mm_Horizontal_Fastron_SMCC | L1 |
| 24 | .1uF | C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C4, C6, C7, C8, C12, C13, C14 +16 |
| 4 | 10uF 25v | CP_Radial_D5.0mm_P2.00mm | C2, C55, C56, C67 |
| 1 | 1uF 50V | CP_Radial_D5.0mm_P2.00mm | C3 |
| 3 | .033uF | C_Axial_L5.1mm_D3.1mm_P10.00mm_Horizontal | C5, C52, C53 |
| 1 | 100uF 16V | CP_Radial_D5.0mm_P2.00mm | C9 |
| 4 | 39pF | C_Disc_D4.7mm_W2.5mm_P5.00mm | C10, C11, C37, C61 |
| 2 | 100uF 16v | CP_Radial_D8.0mm_P5.00mm | C15, C27 |
| 10 | .022uF | C_Disc_D8.0mm_W2.5mm_P5.00mm | C16, C17, C20, C21, C25, C32, C33, C35 +2 |
| 4 | 1800pF | C_Disc_D4.7mm_W2.5mm_P5.00mm | C18, C19, C22, C23 |
| 1 | 10uF NP | C_Radial_D6.3mm_H5.0mm_P2.50mm | C24 |
| 1 | 4700uF 16V | CP_Radial_D12.5mm_P5.00mm | C29 |
| 1 | 220uF 16V | CP_Radial_D8.0mm_P5.00mm | C31 |
| 1 | 100pF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C34 |
| 1 | 470uF | CP_Radial_D8.0mm_P3.50mm | C54 |
| 1 | .022uF | C_Axial_L5.1mm_D3.1mm_P10.00mm_Horizontal | C57 |
| 3 | 1000pF | C_Disc_D4.7mm_W2.5mm_P5.00mm | C58, C59, C68 |
| 1 | 33pF | C_Rect_L7.2mm_W3.0mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C60 |
| 2 | 220uF 25V | CP_Radial_D8.0mm_P3.50mm | C62, C63 |
| 1 | 150pF | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C64 |
| 1 | 82pF | C_Rect_L7.2mm_W3.0mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C65 |
| 1 | 27pF | C_Rect_L7.2mm_W3.0mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C66 |
| 1 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 13 | 4.7K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R3, R4, R5, R6, R7, R8, R11 +5 |
| 2 | 47 | R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R9, R10 |
| 1 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12 |
| 1 | 100 1/2W | R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R13 |
| 1 | 220 1/2W | R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R14 |
| 1 | 270 1/2W | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R15 |
| 6 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R16, R17, R36, R40, R47, R54 |
| 1 | 510 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R18 |
| 1 | .1 ohms 1/2W | R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal | R19 |
| 1 | 51 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R20 |
| 5 | 120 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R22, R43, R50, R57, R72 |
| 1 | 82 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R23 |
| 1 | 2.2K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R26 |
| 1 | 1.5K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R27 |
| 6 | 10 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R28, R39, R46, R53, R68, R71 |
| 1 | 3.9K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R29 |
| 4 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R30, R34, R60, R69 |
| 1 | 39K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R31 |
| 1 | 20K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R32 |
| 2 | 220K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R33, R35 |
| 3 | 3K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R38, R45, R52 |
| 3 | 2K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R42, R49, R56 |
| 1 | 150 | R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R63 |
| 1 | 47 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R64 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R65 |
| 1 | 7.5K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R66 |
| 1 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R70 |
TRS-80 Color Computer 3 design files
The KiCad project lives in the qbancoffee/coco_motherboards repository on GitHub; these links point at the commit this page was built from.
TRS-80 Color Computer 3: common questions
How big is the TRS-80 Color Computer 3 PCB?
The TRS-80 Color Computer 3 measures 280 × 156.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the TRS-80 Color Computer 3?
205 components, from 95 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the TRS-80 Color Computer 3 design files?
From the qbancoffee/coco_motherboards repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the TRS-80 Color Computer 3 design in my own project?
Yes, under the terms of its GPL-3.0 license, which qbancoffee chose for the repository.
