TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B)
About the TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B) PCB
TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B) is an open source PCB design by qbancoffee, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 230 × 170 mm, with 150 components from 68 distinct parts.
Other key parts include the MC6809E, SN74LS785N, MC6847T1, 6821 and SC67331P. By type, the board carries 53 capacitors, 32 resistors, 20 ICs, 12 connectors, 12 diodes and 5 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 & PCB of the TRS-80 Color Computer 2 models 26-3134B and 26-3136B.
Schematics are not available for this model: The reference board was donated by MrDave6309
Main components on the TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B)
TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B) bill of materials (BOM)
150 components, 68 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MC6809E | DIP-40_W15.24mm_Socket | IC1 |
| 1 | SN74LS785N | DIP-40_W15.24mm_Socket | IC2 |
| 1 | MC6847T1 | DIP-40_W15.24mm_Socket | IC3 |
| 1 | 6821 | DIP-40_W15.24mm_Socket | IC4 |
| 1 | SC67331P | DIP-40_W15.24mm_Socket | IC5 |
| 1 | SC77526 | DIP-20_W7.62mm_Socket | IC6 |
| 1 | SC77527P | DIP-16_W7.62mm_Socket | IC7 |
| 1 | 27C128 | DIP-28_W15.24mm_Socket | IC8 |
| 2 | TMS4416 | DIP-18_W7.62mm_Socket | IC10, IC11 |
| 1 | 74LS138 | DIP-16_W7.62mm_Socket | IC12 |
| 8 | KM4164 | DIP-16_W7.62mm_Socket | IC14, IC15, IC16, IC17, IC18, IC19, IC20, IC21 |
| 1 | 74LS02 | DIP-14_W7.62mm_Socket | IC22 |
| 1 | A1 | power_connector_post | A1 |
| 1 | A2 | power_connector_post | A2 |
| 1 | A3 | power_connector_post | A3 |
| 1 | KSD880O | TO-220-3_Horizontal_TabDown | Q1 |
| 1 | 14.31818 Mhz | Crystal_HC49-U_Horizontal | X1 |
| 1 | Conn_02x20_Odd_Even | EBC20DRAS | CN1 |
| 1 | Conn_01x16_Female | PinHeader_1x16_P2.54mm_Vertical | CN2 |
| 2 | Conn_01x12_Female | PinSocket_1x12_P2.54mm_for_memory_board_adapter | CN3, CN4 |
Show 48 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 128K 64K | SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm_NumberLabels | J1, J3, J4, J5 |
| 1 | 64K 128K | SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm_NumberLabels | J2 |
| 1 | SolderJumper_2_Open | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | J6 |
| 1 | Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | J7 |
| 1 | Conn_01x09 | PinHeader_1x09_P2.54mm_Vertical | J8 |
| 1 | Right Joystick | CUI_SDS-60J | JK1 |
| 1 | Left Joystick | CUI_SDS-60J | JK2 |
| 1 | RS232 | CUI_SDS-40J | JK3 |
| 1 | Cassette | CUI_SDS-50J | JK4 |
| 1 | SolderJumper_2_Open | SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP8 |
| 1 | RF_modulator | CoCo_2_3134A_RF_Modulator | MDV-6 |
| 1 | J0971CS5VDC.45 | RELAY_J0971CS5VDC.45 | RY1 |
| 1 | SW_DPDT_x2 | F2UEE | SW1 |
| 1 | SW_DPDT_x2-Switch | MFS201N-16-Z | SW2 |
| 1 | Reset Switch | B3F3152 | SW3 |
| 1 | C_Variable | C_Rect_L7.2mm_W7.2mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | TC1 |
| 6 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D7, D12 |
| 2 | 1KF20-04 | D_A-405_P10.16mm_Horizontal | D5, D6 |
| 2 | 1N4002 | D_DO-41_SOD81_P10.16mm_Horizontal | D8, D9 |
| 2 | 1N5401 | D_DO-201AD_P15.24mm_Horizontal | D10, D11 |
| 5 | Ferrite_Bead_Small | ferrite_bead | FB1, FB2, FB3, FB4, FB5 |
| 26 | .1uF | C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C2, C4, C5, C6, C7, C10, C12 +18 |
| 1 | 1uF 50V | CP_Radial_D5.0mm_P2.00mm | C8 |
| 4 | 100uF 16v | CP_Radial_D8.0mm_P5.00mm | C9, C11, C34, C54 |
| 1 | 39pF | C_Disc_D7.5mm_W5.0mm_P5.00mm | C13 |
| 1 | 33pF | C_Rect_L7.2mm_W3.0mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C14 |
| 2 | 56pF | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C15, C17 |
| 1 | 47uF 16v | CP_Radial_D5.0mm_P2.00mm | C19 |
| 2 | 150pF | C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C21, C23 |
| 2 | 1800pF | C_Disc_D4.7mm_W2.5mm_P5.00mm | C24, C25 |
| 10 | .022uF | C_Disc_D8.0mm_W2.5mm_P5.00mm | C26, C27, C28, C29, C30, C33, C40, C41 +2 |
| 1 | 10uF NP | C_Radial_D5.0mm_H11.0mm_P2.00mm | C32 |
| 1 | 4700uF 16V | CP_Radial_D16.0mm_P7.50mm | C36 |
| 1 | 220uF 16V | CP_Radial_D8.0mm_P5.00mm | C38 |
| 6 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4, R8, R9 |
| 1 | 100 1/2W | R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R5 |
| 4 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6, R11, R12, R29 |
| 1 | 150 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 8 | 4.7K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10, R15, R16, R17, R18, R19, R20, R32 |
| 2 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13, R14 |
| 1 | 1.5k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R21 |
| 1 | 510 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R22 |
| 1 | 220 1/2W | R_Axial_DIN0411_L9.9mm_D3.6mm_P12.70mm_Horizontal | R23 |
| 1 | 51 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R24 |
| 1 | .1 ohms 1W | R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R25 |
| 2 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R26, R27 |
| 1 | 270 1/2W | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R28 |
| 2 | 33 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R30, R31 |
TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B) 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 2 NTSC ( 26-3134B & 26-3136B): common questions
How big is the TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B) PCB?
The TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B) measures 230 × 170 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B)?
150 components, from 68 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 2 NTSC ( 26-3134B & 26-3136B) 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 2 NTSC ( 26-3134B & 26-3136B) design in my own project?
Yes, under the terms of its GPL-3.0 license, which qbancoffee chose for the repository.
