2 layers407 × 184 mm
TRS-80-Model I G E1
RetroStack/TRS-80-Model-I-G-E1
Hardware Replica of the TRS-80 Model I Revision G
230 parts57MIT
2 layers135.5 × 123 mm
Decoder
LinuxNerd14/JBD8-16WDC 65C02 based computer with a large RAM bank
- Size
- 135.5 × 123 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 43
- Nets
- 152
- Pads
- 392
- Tracks, vias
- 1,688, 245
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 Oct 2024
- Updated
- 4 Jun 2026
Overview
Decoder is an open-source printed circuit board by LinuxNerd14, from the LinuxNerd14/JBD8-16 repository on GitHub. It is a 2-layer board of 135.5 × 123 mm with 43 parts on 152 nets, routed with 1,688 tracks and 245 vias.
It is built around the 74LS11DC, 74LS32SC and 74LS00SC, with the 74LS04PC among its other parts. Its parts include 19 capacitors, 19 ICs and 5 connectors. It belongs with the retro computing and games boards of this library.
Main components
474LS11DC
CDIP-140℃~+70℃ 18ns@5V,50pF 2V 3 4.5V~5.5V 400uA 6.6mA 74LS Series 800mV 8mA AND Gate CDIP-14 Logic GatesTexas InstrumentsLogic Gates
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates
74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
README
README.mdThe JBD8-16
A computer with the skeleton of the BE6502 by the revered Ben Eater with the ultimate goal of running DOOM and making a decent platform for programing in asembly or C at a very fundemental level.
This computer is currently still deep in hardware development but has a diverse set of planned features like hardware based random numbers and way more RAM than what is reasonable along with an implimentation of the VERA by the 8BitGuy.
This is by far not a finished project as these features awaiting implimentation:
- Memory bank
- Proper random number generator
- Micro SD card
- Better display or VGA output
- Easily reproducable PCB's
List of contributers:
Parts
43| Qty | Value | Footprint | References |
|---|---|---|---|
| 19 | 1uf-0.1uf | Capacitor_THT:CP_Radial_Tantal_D5.0mm_P2.50mm | C1, C2, C3, C4, C5, C6, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19 +3 |
| 5 | 74LS11 | Package_DIP:DIP-14_W7.62mm_Socket | U5, U6, U9, U12, U13 |
| 5 | 74LS32 | Package_DIP:DIP-14_W7.62mm_Socket | U7, U11, U15, U16, U17 |
| 4 | 74LS154 | Package_DIP:DIP-24_W7.62mm_Socket | U1, U2, U3, U4 |
| 3 | 74LS08 | Package_DIP:DIP-14_W7.62mm_Socket | U8, U14, U18 |
| 2 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J3 |
| 1 | 74LS00 | Package_DIP:DIP-14_W7.62mm_Socket | U19 |
| 1 | 74LS04 | Package_DIP:DIP-14_W7.62mm_Socket | U10 |
| 1 | Conn_01x10_Pin | Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical | J4 |
| 1 | Conn_01x16_Pin | Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical | J2 |
| 1 | Conn_01x18_Pin | Connector_PinHeader_2.54mm:PinHeader_1x18_P2.54mm_Vertical | J5 |
Questions
How big is the Decoder PCB?
It measures 135.5 × 123 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Decoder use?
43 parts, built around the 74LS11DC, 74LS32SC, 74LS00SC and 74LS04PC. 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 Decoder KiCad files?
From the LinuxNerd14/JBD8-16 repository on GitHub, at the commit this page was made from: the board is decoder_schematic/Decoder.kicad_pcb and its schematic JBD8-16_schematic/JBD8-16.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Decoder design in my own project?
Its repository states no licence, so its author keeps all rights: ask LinuxNerd14 before reusing the design.
Similar boards
- 4 layers330.2 × 215.9 mm
- 2 layers
- 2 layers486 × 306.3 mm
- 2 layers630 × 300 mm
- 2 layers123.2 × 77.5 mm
- 2 layers
Entrex Trapezoid Processor Board v37
ForgottenMachines/Entrex
The technologies documented here will include all like-kind systems manufactured by Nixdorf, Redifon, ROCC & Mera, all originally designed by Entrex Inc, Burlington, MA USA.
194 parts1 - 2 layers60.1 × 60 mm
CD90-640 rom
OlivierP-To8/CD90-640
Remake of the CD 90-640 floppy disk controller for Thomson computers
11 parts1