2 layers160 × 100 mm
2 layers160 × 100 mm
Graphics
Noah1989/loopmicro2An 8-bit microcomputer for the 21st century
- Size
- 160 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 68
- Nets
- 267
- Pads
- 808
- Tracks, vias
- 2,348, 168
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 15 May 2019
- Updated
- 3 Aug 2026
Overview
Graphics is an open-source printed circuit board by Noah1989, from the Noah1989/loopmicro repository on GitHub, published under the MIT licence. It is a 2-layer board of 160 × 100 mm with 68 parts on 267 nets, routed with 2,348 tracks and 168 vias.
It is built around the 74AC573PC, 74HC688D and 74AC161PC, with the 74HC00D, 74AC138SC and 74HC109D among its other parts. Its parts include 34 ICs, 25 capacitors, 4 resistors, 2 connectors and 1 switch.
Main components
7
74AC573PC
PDIP-20-40℃~+85℃ 1.5ns 24mA 24mA 2V~6V 3ns 4uA 5.5ns 74AC 8 D Latch Tri-State PDIP-20 Latches ROHSonsemiLatches
74HC688D
SOIC-20-300mil-40℃~+125℃ 0.1V 0.5V、1.35V、1.8V 1.2V、2.4V、3.2V 1.9V、4.4V、5.9V 160uA 16ns@6.0V,50pF 2V~5V SOIC-20-300mil Digital Comparators ROHSNexperiaDigital Comparators
74AC161PC
PDIP-16-40℃~+85℃ 1 167MHz 2V~6V 4 5ns@5V,50pF 74AC Asynchronous Divide-by-2 Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous Up Counter PDIP-16 Counters, Dividers ROHSonsemiCounters, Dividers
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 Gates
74AC138SC
SOIC163-of-8 Decoder/DemultiplexerFAIRCHILDUncategorised
74HC109D
SO-16-40℃~+125℃ 1 2 2V~6V 3.5pF 30ns@6V,50pF 4uA 5.2mA 5.2mA 74HC Series 81MHz Complementary JK-Type Rising Edge Set and Reset SOIC-16 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 ROHSNexperiaInverters
README
README.mdLoop Microcomputer
a minmal 8-bit machine that is...
-
... independent:
- contains all the tools required to design another version of itself
- does not require high soldering skills, uses through-hole parts only
- uses only "evergreen" parts that have been in production for decades and are still made today
-
... aproachable:
- simple through reduction
- NO hidden complexity behind brittle abstractions
- open source and self-documenting
-
... powerful, with it you can:
- learn/teach how computers work
- design electronics
- control CNC machines / 3d printers
- play games
Parts
68| Qty | Value | Footprint | References |
|---|---|---|---|
| 24 | C_Small | Capacitor_THT:C_Disc_D7.0mm_W2.5mm_P5.00mm | C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24 +8 |
| 11 | 74AC573 | Package_DIP:DIP-20_W7.62mm_Socket | U18, U19, U20, U21, U22, U23, U24, U25, U26, U27, U28 |
| 9 | 74HC688 | Package_DIP:DIP-20_W7.62mm_Socket | U7, U8, U9, U10, U11, U12, U13, U14, U29 |
| 6 | 74AC161 | Package_DIP:DIP-16_W7.62mm_Socket | U1, U2, U3, U4, U5, U6 |
| 4 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4 |
| 3 | 74HC00 | Package_DIP:DIP-14_W7.62mm_Socket | U32, U33, U34 |
| 2 | 74AC138 | Package_DIP:DIP-16_W7.62mm_Socket | U30, U31 |
| 2 | 74HC109 | Package_DIP:DIP-16_W7.62mm_Socket | U16, U17 |
| 1 | 25.175MHz | Oscillator:Oscillator_DIP-8_LargePads | X1 |
| 1 | 74HC04 | Package_DIP:DIP-14_W7.62mm_Socket | U15 |
| 1 | C96ABC | common:Socket_DIN41612-CaseC1-full-Male-96Pin-3rows | J1 |
| 1 | CP_Small | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1 |
| 1 | Conn_01x26_Male | Connector_IDC:IDC-Header_2x13_P2.54mm_Horizontal | J2 |
| 1 | LOGO | common:logo | G*** |
| 1 | SW_Coded_SH-7050 | Button_Switch_THT:Nidec_Copal_SH-7010C | SW1 |
Questions
How big is the Graphics PCB?
It measures 160 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Graphics use?
68 parts, built around the 74AC573PC, 74HC688D, 74AC161PC and 74HC00D. 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 Graphics KiCad files?
From the Noah1989/loopmicro repository on GitHub, at the commit this page was made from: the board is hardware/ecb-prototype/gpu-sync/Graphics.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Graphics design in my own project?
Its repository publishes it under the MIT 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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