2 layers262.5 × 107.9 mm
Econopet
DLehenbauer/econopet
Mainboard replacement for Commodore PET/CBM series machines
295 parts19CC0-1.0
2 layers262.5 × 107.9 mm
Commodore pet clone
DLehenbauer/commodore-pet-clone13Open hardware clone of the Commodore PET 4032
- Size
- 262.5 × 107.9 mm
- Copper layers
- 2
- Thickness
- 0.57 mm
- Parts
- 316
- Nets
- 390
- Pads
- 1,761
- Tracks, vias
- 5,506, 1,044
- Pours
- 8
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 8 Jun 2022
- Updated
- 9 Sep 2025
Overview
Commodore pet clone is an open-source printed circuit board by DLehenbauer, from the DLehenbauer/commodore-pet-clone repository on GitHub, published under the CC0-1.0 licence. It is a 2-layer board of 262.5 × 107.9 mm with 316 parts on 390 nets, routed with 5,506 tracks and 1,044 vias.
It is built around the SN74LS07D, 74LS245SC and SN74LVC4245APWRE4, with the LM317AG-TN3-R, AMS1117-3.3 and SM4007 among its other parts. Its parts include 84 capacitors, 73 resistors, 15 ICs, 14 diodes and 12 connectors. It belongs with the retro computing and games boards and the FPGA and CPLD boards of this library.
Main components
10
SN74LS07D
SOIC-140.25mA 0℃~+70℃ 1 10ns@5V,15pF 4.75V~5.25V 40mA 6 74LS Open Collector Unidirectional SOIC-14 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers74LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
SN74LVC4245APWRE4
TSSOP-24-40℃~+85℃ 2.7V~3.6V 4.5V~5.5V 8 Bidirectional Level translator Output enable high-impedance Tri-State TSSOP-24 Translators, Level Shifters ROHSTexas InstrumentsTranslators, Level Shifters
LM317AG-TN3-R
TO-252-2(DPAK)-40℃~+85℃ 1 1.2V~37V 1.5A 40V 5V@(500mA) 80dB@(120Hz) Adjustable Over Current Protection、Over Temperature Protection、Short Circuit Protection Positive TO-252-2(DPAK) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSUTCVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SM4007
MELFMELF Diodes - General Purpose ROHSYONGYUTAIDiodes - General Purpose
SS34
SMA(DO-214AC)-55℃~+125℃ 3A 40V 500uA@40V 550mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
AO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
35YXJ470M10X16
插件,D10xL16mm10000hrs@105℃ 10mm 16mm 35V 470uF 5mm ±20% 插件,D10xL16mm Aluminum Electrolytic Capacitors - Leaded ROHSRubyconAluminum Electrolytic Capacitors - Leaded
CON-SOCJ-2155
THrough holeTHroughhole New Arrivals ROHSGravitechUncategorised
README
README.mdNote: The latest information on this project is here.
PET Clone
Open hardware clone of the Commodore CBM/PET using modern parts. Some assembly required. :-)
Status
Working prototype. PCB and SMT manufacturing files are here.
About
This open hardware CBM/PET clone can be used in two ways:
- By itself with an HDMI display and USB keyboard
- As a mainboard replacement to repair/enhance a vintage CBM/PET
You can also do both at once, as shown in the image below:
Design
The following block diagram provides an overview of the system architecture:
Here are the highlights:
- CPU and I/O are similar to the original Commodore design, using the 6502, PIA, and VIA.
- Main RAM, Display RAM and ROM are combined on a single 128K SRAM.
- On POR the MCU initializes $9000-FFFF with the user's selected ROM set
- After initialization, $9000-FFFF is write protected.
- Timing, address decoding, and native PET video are consolidated on a small FPGA.
- The MCU reads display RAM and mirrors the PET video to HDMI (via bit-banged DVI)
- The MCU also reports USB keyboard input to the FPGA
- The FPGA intercepts reads from $E812 to inject USB key input as-needed
- When no USB keys are pressed, the read passes through to PIA1.
Contributing
Collaborators warmly appreciated (see Issues).
License
This project is public domain under the CC0-1.0 license, exempting portions incorporated from other open source projects as noted here and in the source code.
Parts
316| Qty | Value | Footprint | References |
|---|---|---|---|
| 47 | 100n | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C10, C11, C13, C18, C19, C20, C22, C23, C26, C27, C28, C30, C34 +31 |
| 39 | PowerTie_2 | PET:NetTie-2_SMD_Pad_1.6_to_0.4mm | PT1, PT2, PT10, PT11, PT12, PT13, PT14, PT15, PT16, PT17, PT18, PT19, PT20, PT21, PT22, PT23 +23 |
| 15 | PowerTie_2 | PET:NetTie-2_SMD_Pad_0.28 | PT40, PT41, PT42, PT43, PT44, PT45, PT46, PT47, PT48, PT49, PT50, PT51, PT52, PT53, PT54 |
| 11 | 33 | Resistor_SMD:R_0402_1005Metric | R19, R21, R22, R48, R51, R63, R67, R68, R69, R70, R71 |
| 9 | 10k | Resistor_SMD:R_0402_1005Metric | R18, R20, R25, R27, R49, R52, R55, R56, R57 |
| 9 | 10k | Resistor_SMD:R_Array_Convex_4x0603 | RN2, RN4, RN6, RN8, RN9, RN10, RN14, RN15, RN16 |
| 9 | 270 | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4, R5, R6, R10, R11, R16 |
| 8 | 1u | Capacitor_SMD:C_0402_1005Metric | C14, C29, C31, C32, C53, C60, C75, C83 |
| 7 | 10u | Capacitor_SMD:C_0603_1608Metric | C16, C17, C24, C25, C70, C81, C82 |
| 7 | 2k2 | Resistor_SMD:R_0402_1005Metric | R7, R8, R9, R64, R65, R73, R74 |
| 6 | 1k | Resistor_SMD:R_0402_1005Metric | R17, R23, R26, R29, R31, R66 |
| 5 | 10n | Capacitor_SMD:C_0402_1005Metric | C62, C65, C67, C69, C73 |
| 5 | SM4007 | Diode_SMD:D_SOD-123F | D5, D11, D12, D13, D14 |
| 4 | 22n | Capacitor_SMD:C_0402_1005Metric | C12, C15, C33, C59 |
| 4 | 4.7k | Resistor_SMD:R_Array_Convex_4x0603 | RN1, RN3, RN5, RN7 |
| 4 | 4k7 | Resistor_SMD:R_0402_1005Metric | R38, R39, R40, R59 |
| 4 | LED_RED | LED_SMD:LED_0603_1608Metric | D1, D6, D7, D9 |
| 3 | 1k5 | Resistor_SMD:R_0402_1005Metric | R41, R44, R50 |
| 3 | 2.2u 6.3V | Capacitor_SMD:C_0402_1005Metric | C37, C38, C52 |
| 3 | 470 | Resistor_SMD:R_Array_Convex_4x0603 | RN11, RN12, RN13 |
| 3 | 5.6k | Resistor_SMD:R_0402_1005Metric | R54, R58, R60 |
| 3 | MountingHole | PET:PET_MountingHole_4mm | H2, H3, H4 |
| 3 | SN74LS07 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U2, U3, U4 |
| 3 | SN74LVC4245APWR | Package_SO:TSSOP-24_4.4x7.8mm_P0.65mm | U18, U19, U20 |
| 3 | SS34 | Diode_SMD:D_SMA | D2, D3, D4 |
| 2 | 100k | Resistor_SMD:R_0402_1005Metric | R30, R33 |
| 2 | 22u | Capacitor_SMD:C_0805_2012Metric | C21, C36 |
| 2 | 27 | Resistor_SMD:R_0603_1608Metric | R12, R15 |
| 2 | 300 | Resistor_SMD:R_0402_1005Metric | R28, R47 |
| 2 | 30p | Capacitor_SMD:C_0402_1005Metric | C47, C48 |
| 2 | 470 | Resistor_SMD:R_0402_1005Metric | R13, R14 |
| 2 | 56k | Resistor_SMD:R_0402_1005Metric | R35, R36 |
| 2 | 5V PWR | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J10, J20 |
| 2 | 74LS245 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U5, U6 |
| 2 | AO3401A | JLCPCB:SOT-23_L2.9-W1.3-P1.90-LS2.4-BR | Q1, Q3 |
| 2 | LED_GRN | LED_SMD:LED_0603_1608Metric | D8, D10 |
| 2 | LM317AG-TN3-R | PET:TO-252-2_ThermalVias | U10, U15 |
| 2 | W65C21N | Package_DIP:DIP-40_W15.24mm_Socket | U7, U8 |
| 1 | 1.2k | Resistor_SMD:R_0402_1005Metric | R32 |
| 1 | 1.5k | Resistor_SMD:R_0402_1005Metric | R45 |
| 1 | 10 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R61 |
| 1 | 10u 6.3V | Capacitor_SMD:C_0402_1005Metric | C50 |
| 1 | 12 MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 120 | Resistor_SMD:R_0402_1005Metric | R43 |
| 1 | 12k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R72 |
| 1 | 12k 1% | Resistor_SMD:R_0402_1005Metric | R34 |
| 1 | 15k | Resistor_SMD:R_0402_1005Metric | R24 |
| 1 | 3.9k | Resistor_SMD:R_0402_1005Metric | R37 |
| 1 | 4.7u 10V | Capacitor_SMD:C_0402_1005Metric | C58 |
| 1 | 4.7u 16V | Capacitor_SMD:C_0603_1608Metric | C84 |
| 1 | 470u | PET:CP_Radial_D18.0mm_P5.00mm_P7.50mm | C35 |
| 1 | 47n | Capacitor_SMD:C_0603_1608Metric | C55 |
| 1 | 47u 10V | Capacitor_SMD:C_1206_3216Metric | C54 |
| 1 | 4k7 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R53 |
| 1 | 5.1k | Resistor_SMD:R_0402_1005Metric | R46 |
| 1 | 600 200ma | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | 68 | Resistor_SMD:R_0805_2012Metric | R42 |
| 1 | 74LS145 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | 9V POWER | Connector_BarrelJack:BarrelJack_Horizontal | J7 |
| 1 | 9V POWER | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J11 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U13 |
| 1 | AS6C1008 | Package_DIP:DIP-32_W15.24mm_Socket | U12 |
| 1 | CASS A | Retrocomputing:CBM_PET_CASS_EDGE_CON_12P | J5 |
| 1 | CASS A READ | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP3 |
| 1 | CASS A ~{MOTOR} | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP5 |
| 1 | CASS A ~{SWITCH} | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | CASS B | Retrocomputing:CBM_PET_CASS_EDGE_CON_12P | J6 |
| 1 | CASS B READ | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP4 |
| 1 | CASS B ~{MOTOR} | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP6 |
| 1 | CASS B ~{SWITCH} | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | CASS_A_HEADER | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J27 |
| 1 | CASS_B_HEADER | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J28 |
| 1 | CONFIG | Button_Switch_THT:SW_DIP_SPSTx04_Slide_6.7x11.72mm_W7.62mm_P2.54mm_LowProfile | SW5 |
| 1 | DVI_CEC | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP7 |
| 1 | DVI_SCL | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP9 |
| 1 | DVI_SDA | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP8 |
| 1 | FLASH | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J8 |
| 1 | FPGA_MCU | Connector_PinHeader_2.54mm:PinHeader_2x11_P2.54mm_Vertical | J16 |
| 1 | FPGA_P1 | Connector_PinHeader_2.54mm:PinHeader_2x15_P2.54mm_Vertical | J24 |
| 1 | FPGA_P2 | Connector_PinHeader_2.54mm:PinHeader_2x14_P2.54mm_Vertical | J23 |
The 285 most common of 316 parts.
Questions
How big is the Commodore pet clone PCB?
It measures 262.5 × 107.9 mm and has 2 copper layers, 0.57 mm thick.
What parts does the Commodore pet clone use?
316 parts, built around the SN74LS07D, 74LS245SC, SN74LVC4245APWRE4 and LM317AG-TN3-R. 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 Commodore pet clone KiCad files?
From the DLehenbauer/commodore-pet-clone repository on GitHub, at the commit this page was made from: the board is hw/Mainboard/Mainboard.kicad_pcb and its schematic hw/Mainboard/Audio.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Commodore pet clone design in my own project?
Its repository publishes it under the CC0-1.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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