2 layers98.9 × 91.4 mm
MicroKit09
electrickery/MicroKit09MK2
A recreation of an MC6809 Single Board Computer from the 1980's
34 parts1
2 layers99.6 × 95 mm
MicroKit09 IO
electrickery/MicroKit09MK21A recreation of an MC6809 Single Board Computer from the 1980's
- Size
- 99.6 × 95 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 77
- Nets
- 67
- Pads
- 344
- Tracks, vias
- 1,033, 78
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 15 Apr 2021
- Updated
- 4 Sep 2025
Overview
MicroKit09 IO is an open-source printed circuit board by electrickery, from the electrickery/MicroKit09MK2 repository on GitHub. It is a 2-layer board of 99.6 × 95 mm with 77 parts on 67 nets, routed with 1,033 tracks and 78 vias.
It is built around the 74LS240DC, 74LS42PC and CA3140, with the HDSP-A153 among its other parts. Its parts include 35 switches, 24 resistors, 9 ICs, 6 capacitors and 3 connectors. It belongs with the computers and single-board computers boards of this library.
Main components
474LS240DC
--55℃~+125℃ 1 15mA 18ns@5V,45pF 24mA 29mA 4.75V~5.25V 74LS Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, TransceiversTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS42PC
PDIP-16-55℃~+125℃ PDIP-16 Interface - SpecializedTexas InstrumentsInterface - Specialized
CA3140
DIP-8-15V~15V -40℃~+125℃ 1 10uV/℃ 30pA 3mV 4.5MHz 40nV/√Hz@1kHz 45mA 50pA 5mA 80dB 9V/us SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
HDSP-A153
DIP-10-20℃~+100℃ 0.3 1 1.8V 14mcd 7 Segment 96mW Common Cathode Red DIP-10 LED Segment Displays ROHSBroadcom LimitedLED Segment Displays
README
README.mdDescription
In several 1983 editions of the French computer magazine 'Led' an MC6809 single board computer was published, supporting a 6-digit, 7-segment Led display and 34 keys. The original has a 2 kByte monitor ROM and 2 kByte RAM.
Most published material can be found here: https://lab.nethence.com/frederic/Microit09/
This is a recreation, with a smaller footprint and some room for expansion.
The original, published monitor version is 1.8. This repository contains my minor enhancements.
My webpage on the subject can be found here: http://electrickery.nl/comp/microKit09/
Parts
77| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 120 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9, R10, R11, R12, R13, R14, R15, R16 |
| 8 | 5k6 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R17, R18, R19, R20, R21, R22, R23, R24 |
| 6 | HDSP-A153 | Display_7Segment:HDSP-A151 | U3, U4, U5, U6, U8, U9 |
| 5 | 100nF | Capacitor_THT:C_Axial_L3.8mm_D2.6mm_P7.50mm_Horizontal | C1, C2, C3, C4, C5 |
| 3 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4, R5, R7 |
| 2 | 4k7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 1 | 0 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW8 |
| 1 | 1 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW12 |
| 1 | 10uF | Capacitor_THT:C_Axial_L3.8mm_D2.6mm_P7.50mm_Horizontal | C6 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 2 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW16 |
| 1 | 27k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | 3 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW20 |
| 1 | 4 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW24 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 5 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW28 |
| 1 | 6 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW11 |
| 1 | 7 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW15 |
| 1 | 74LS240 | Package_DIP:DIP-20_W7.62mm_Socket | U1 |
| 1 | 74LS42 | Package_DIP:DIP-16_W7.62mm_Socket | U2 |
| 1 | 8 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW19 |
| 1 | 9 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW23 |
| 1 | A | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW27 |
| 1 | B | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW10 |
| 1 | C | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW14 |
| 1 | CA3140 | Package_DIP:DIP-8_W7.62mm_Socket | U7 |
| 1 | Cassette | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | SW35 |
| 1 | D | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW18 |
| 1 | Dec | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW31 |
| 1 | E | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW22 |
| 1 | F | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW26 |
| 1 | GO | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW25 |
| 1 | I/O-connector | Connector_PinHeader_2.54mm:PinHeader_2x17_P2.54mm_Vertical | J1 |
| 1 | Inc | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW32 |
| 1 | L | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW13 |
| 1 | NMI | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW33 |
| 1 | P | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW9 |
| 1 | RST | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW34 |
| 1 | U1 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW1 |
| 1 | U2 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW2 |
| 1 | U3 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW3 |
| 1 | U4 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW4 |
| 1 | U5 | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW7 |
| 1 | X | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW5 |
| 1 | cnt | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW21 |
| 1 | input | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | mem | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW30 |
| 1 | ofs | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW17 |
| 1 | output | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | pb | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW6 |
| 1 | reg | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW29 |
Questions
How big is the MicroKit09 IO PCB?
It measures 99.6 × 95 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MicroKit09 IO use?
77 parts, built around the 74LS240DC, 74LS42PC, CA3140 and HDSP-A153. 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 MicroKit09 IO KiCad files?
From the electrickery/MicroKit09MK2 repository on GitHub, at the commit this page was made from: the board is PCBs/MicroKit09_IO/MicroKit09_IO.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the MicroKit09 IO design in my own project?
Its repository states no licence, so its author keeps all rights: ask electrickery before reusing the design.
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