4 layers133 × 93 mm
Project GP8B
JonathSpirit/GP8B
G_Processor8Bits a homemade without any microcontroller 8bits processor
110 parts
4 layers306 × 244 mm
Pg09-system
thorpej/pg09-system136809 Playground - main system
- Size
- 306 × 244 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 167
- Nets
- 500
- Pads
- 1,840
- Tracks, vias
- 33, 0
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 26 Apr 2023
- Updated
- 12 Jul 2025
Overview
Pg09-system is an open-source printed circuit board by thorpej, from the thorpej/pg09-system repository on GitHub, published under the BSD-2-Clause licence. It is a 4-layer board of 306 × 244 mm with 167 parts on 500 nets, routed with 33 tracks and 0 vias.
It is built around the 74AHCT245D, AS6C4008-55PCN and 74HC00D, with the 74AHC374D, 74HC04D and 74AHC08D among its other parts. Its parts include 54 capacitors, 52 ICs, 17 connectors, 8 resistors and 4 diodes. It belongs with the FPGA and CPLD boards of this library.
Main components
12
74AHCT245D
SOIC-20-300mil-40℃~+125℃ 1 11ns@5.5V,50pF 4.5V~5.5V 74AHCT 8 80uA 8mA 8mA Bidirectional TTL-compatible CMOS Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
AS6C4008-55PCN
PDIP-320℃~+70℃ 2.7V~5.5V 30mA 4Mbit 4uA 55ns Parallel Port (Parallel) PDIP-32 SRAM ROHSAlliance MemorySRAM
74HC00D
SOP-14-40℃~+125℃ 1.5V、3.15V、4.2V 1.9V、3.7V、5.9V 100mV、400mV、400mV 2 2V~6V 4 40uA 5.2mA 5.2mA 500mV~1.8V 74HC Series 7ns@6V,50pF NAND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates74AHC374D
SO-20-300mil-40℃~+125℃ 10.1ns@4.5V,50pF 185MHz 2V~5.5V 2ns 3ns 3pF 3uA 74AHC Series 8mA 8mA D-Type Rising Edge Tri-State SO-20-300mil Flip Flops ROHSNexperiaFlip Flops74HC04D
SOP-14-40℃~+125℃ 1 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV、400mV 14ns@6V,50pF 2V~6V 2uA 5.2mA 5.2mA 500mV~1.8V 6 74HC SOIC-14 Inverters ROHSNexperiaInverters74AHC08D
SOIC-14-40℃~+125℃ 1.5V~3.85V 1.9V、2.9V、4.4V 2 2V~5.5V 2uA 4 500mV~1.65V 550mV 7.9ns@5V,50pF 74AHC Series 8mA 8mA AND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
74AHC157D
SO-16-40℃~+125℃ 10.5ns@5.0V,50pF 2V~5.5V 74AHC 8/4 80uA 8mA 8mA Multiplexer Single Supply SO-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches, Multiplexers, Decoders
74HC148P-E
DIP-16-55℃~+125℃ 15ns@4.5V,50pF 2V~6V 4uA 5.2mA 5.2mA 74HC Decoder Single Supply DIP-16 Signal Switches, Multiplexers, Decoders ROHSRenesas ElectronicsSignal Switches, Multiplexers, DecodersDS1813-5+
TO-92-3-40℃~+85℃@(Ta) 1 1.2V~5.5V 150ms 4.75V Active Low No Open Drain Voltage Monitor Yes TO-92-3 Supervisor and Reset ICs ROHSAnalog DevicesSupervisor And Reset ICs
74AHC05T14
TSSOP-14-40℃~+125℃ 1 1.5V~3.85V 20uA 2V~5.5V 440mV 500mV~1.65V 6 7.5ns@5V,50pF 74AHC 8mA Schmitt trigger TSSOP-14 Inverters ROHSDiodes IncorporatedInverters74AHC138D
SO-16-40℃~+125℃ 2V~5.5V 4uA 6.3ns@5V,50pF 74AHC 8mA 8mA Decoder Single Supply SO-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74AHC139D
SO-16-40℃~+125℃ 2V~5.5V 4/8 5.6ns@5V,50pF 74AHC 80uA 8mA 8mA Decoder Level shifting Single Supply SO-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers
README
README.md6809 Playground
Welcome to my 6809 Playground! This project is about building a general purpose 8-bit computer based on the Motorola 6809 CPU. While this is definitely a retro-computer project, I'm not going to be dogmatic about it -- modern gadgets that add value to the project will have a home here, too.
The whole point of this exercise is to learn-by-doing and have fun in the process. I have a few ideas about how I want the project to go, but it may veer this way or that as it progresses. We'll see!
I invite you to follow along with this YouTube playlist. As each installment is posted, this README will be updated with additional information about the that installment, including links to data sheets and a parts list.
If you learn something from this, if you decide to build one of these yourself, or if it inspires you embark on a similar adventure on your own, I would love to hear from you!
01 - Introduction
In the first installment, I briefly introduce the project and provide some background.
Video link: 01 - Introduction
02 - Clock Generator
In the second installment, I describe the design and implementation of the clock generator circuitry.
Major components:
- 74ACT163 binary counter
- 74ACT109 dual J-/K flip-flop
- Lattice GAL22V10 or Atmel ATF22V10 electrically-eraseable programmable logic device
Video link: 02 - Clock Generator
03 - Reset Generator
This the third installment, I describe how the reset generator works.
Major components:
Video link: 03 - Reset Generator
Parts
167| Qty | Value | Footprint | References |
|---|---|---|---|
| 48 | 0.1µF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C101, C102, C103, C104, C105, C106, C201, C202, C203, C204, C301, C302, C303, C1001, C1002, C1003 +32 |
| 13 | 10K | Resistor_THT:R_Array_SIP9 | RN101, RN102, RN201, RN301, RN302, RN303, RN304, RN305, RN306, RN401, RN402, RN403, RN404 |
| 10 | MountingHole_Pad | MountingHole:MountingHole_4.3mm_M4_Pad_Via | H101, H102, H103, H104, H105, H106, H107, H108, H109, H110 |
| 6 | AS6C4008-55PCN | Package_DIP:DIP-32_W15.24mm_Socket | U603, U604, U605, U606, U607, U608 |
| 6 | GAL22V10 | Package_DIP:DIP-24_W7.62mm_Socket | U102, U106, U204, U301, U302, U411 |
| 4 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R801, R802, R1004, R1005 |
| 4 | 74HC00 | Package_DIP:DIP-14_W7.62mm_Socket | U405, U406, U407, U408 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_Pad_Via | H1001, H1002, H1003, H1004 |
| 3 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R301, R1001, R1002 |
| 3 | 470µF 25V | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C802, C803, C804 |
| 3 | 74AHC374 | Package_DIP:DIP-20_W7.62mm_Socket | U413, U414, U803 |
| 3 | 74AHCT245 | Package_DIP:DIP-20_W7.62mm_Socket | U103, U104, U105 |
| 3 | 74HC04 | Package_DIP:DIP-14_W7.62mm_Socket | U402, U403, U404 |
| 3 | W65C21S | Package_DIP:DIP-40_W15.24mm_Socket | U303, U304, U401 |
| 2 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D101, D1002 |
| 2 | 74AHC08 | Package_DIP:DIP-14_W7.62mm_Socket | U502, U503 |
| 2 | 74AHC157 | Package_DIP:DIP-16_W7.62mm_Socket | U609, U610 |
| 2 | 74HC148 | Package_DIP:DIP-16_W7.62mm_Socket | U409, U410 |
| 2 | DS1813 | Package_TO_SOT_THT:TO-92_Inline | U107, U108 |
| 2 | SNES-Controller-Socket | jrt-SNES:SNES-Connector_Vertical | J1102, J1103 |
| 1 | #PS_ON | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J802 |
| 1 | 1.8432MHz | Oscillator:Oscillator_DIP-8 | X701 |
| 1 | 100µF 16V | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C108 |
| 1 | 10µF 50V | Capacitor_THT:CP_Radial_D8.0mm_P2.50mm | C107 |
| 1 | 32.0000MHz | Oscillator:Oscillator_DIP-8 | X201 |
| 1 | 3K3 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R102 |
| 1 | 4700µF 16V | Capacitor_THT:CP_Radial_D12.5mm_P5.00mm | C801 |
| 1 | 74AHC05 | Package_DIP:DIP-14_W7.62mm_Socket | U415 |
| 1 | 74AHC138 | Package_DIP:DIP-16_W7.62mm_Socket | U305 |
| 1 | 74AHC139 | Package_DIP:DIP-16_W7.62mm_Socket | U601 |
| 1 | 74HC164 | Package_DIP:DIP-14_W7.62mm_Socket | U1003 |
| 1 | 74HC86 | Package_DIP:DIP-14_W7.62mm_Socket | U1002 |
| 1 | AS6C6264-55PCN | Package_DIP:DIP-28_W15.24mm_Socket | U602 |
| 1 | ATX-24 | Connector_Molex:Molex_Mini-Fit_Jr_5566-24A_2x12_P4.20mm_Vertical | J801 |
| 1 | Adafruit MicroSD Card Breakout Board+ | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J1001 |
| 1 | Adafruit_FTDI_Friend | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal | U705 |
| 1 | Adafruit_Metro_Mini | Package_DIP:DIP-28_W15.24mm_Socket | U801 |
| 1 | Ali_Express_FTDI_Breakout | jrt-Connectors:Ali_Express_FTDI_Breakout | U702 |
| 1 | CD74ACT109 | Package_DIP:DIP-16_W7.62mm_Socket | U201 |
| 1 | CD74ACT163 | Package_DIP:DIP-16_W7.62mm_Socket | U202 |
| 1 | Clock Speed | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J201 |
| 1 | Expansion 1 | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Vertical | J901 |
| 1 | Expansion 1 ext | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J902 |
| 1 | Expansion 2 | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Vertical | J903 |
| 1 | Expansion 2 ext | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J904 |
| 1 | Expansion 3 | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Vertical | J905 |
| 1 | Expansion 3 ext | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J906 |
| 1 | Expansion 4 | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Vertical | J907 |
| 1 | Expansion 4 ext | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J908 |
| 1 | Front Panel | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J101 |
| 1 | MC6809E | Package_DIP:DIP-40_W15.24mm_Socket | U101 |
| 1 | NMI | Button_Switch_THT:SW_PUSH_6mm | SW101 |
| 1 | PS/2 Keyboard | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal | J1101 |
| 1 | PSU-CTRL console | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J803 |
| 1 | Power | LED_THT:LED_D3.0mm | D801 |
| 1 | Power | Button_Switch_THT:SW_PUSH_6mm | SW801 |
| 1 | Reset | Button_Switch_THT:SW_PUSH_6mm | SW102 |
| 1 | SD Card | LED_THT:LED_D3.0mm | D1001 |
| 1 | SST39SF040 | Socket:DIP_Socket-32_W11.9_W12.7_W15.24_W17.78_W18.5_3M_232-1285-00-0602J | U501 |
| 1 | TL16C2552 | Package_LCC:PLCC-44_THT-Socket | U701 |
| 1 | VERA-Module | jrt-Connectors:VERA-Module | U1101 |
| 1 | W65C22S | Package_DIP:DIP-40_W15.24mm_Socket | U1001 |
Questions
How big is the Pg09-system PCB?
It measures 306 × 244 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Pg09-system use?
167 parts, built around the 74AHCT245D, AS6C4008-55PCN, 74HC00D and 74AHC374D. 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 Pg09-system KiCad files?
From the thorpej/pg09-system repository on GitHub, at the commit this page was made from: the board is design-files/pg09-system.kicad_pcb and its schematic design-files/pg09-system-addr-decode.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pg09-system design in my own project?
Its repository publishes it under the BSD-2-Clause 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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