2 layers88.9 × 47 mm Test register, the printed circuit board in 3D

Test register

Homebrew CPU project

Size: 88.9 × 47 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 43
Nets: 89
Pads: 262
Tracks, vias: 671, 77
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 20 Oct 2019
Updated: 1 Jul 2020

Overview

Test register is an open-source printed circuit board by pottsali, from the pottsali/cpu-pub repository on GitHub. It is a 2-layer board of 88.9 × 47 mm with 43 parts on 89 nets, routed with 671 tracks and 77 vias.

It is built around the 74LS245SC and 74LS377PC. Its parts include 6 capacitors, 6 ICs, 5 connectors, 3 resistors and 3 diodes.

Main components

README

README.md

MUPS/16 Homebrew CPU project

This is public repo for files from the MUPS/16 homebrew CPU project. Please see http://mups16.net for details.

Files

Schematics

Currently I've only uploaded the schematics for the PCBs here, and will add more as I complete the last few bits. Most of the schematics are documented on the MUPS/16 website.

Others

I have a few other sets of files to clean up and upload:

A gate-level simulation of the whole system in Digital format
Microcode generation, for the control ROMs
An assembler
A very basic monitor to test the system

These are not yet in a fit state to upload, but I will add them as I clean them up.

Parts

Qty	Value	Footprint	References
16	LED	LED_SMD:LED_0805_2012Metric	0, D4, D5, D6, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19
6	100n	Capacitor_SMD:C_0805_2012Metric	C1, C2, C3, C4, C5, C6
4	1K	Resistor_SMD:R_Array_Convex_4x1206	RN1, RN2, RN3, RN4
4	74LS245	Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm	U3, U4, U5, U6
3	1K	Resistor_SMD:R_0805_2012Metric	R1, R2, R3
2	74LS377	Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm	U1, U2
1	A Bus	Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical	J3
1	B Bus	Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical	J4
1	Ctrl	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J2
1	Data Bus	Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical	J1
1	IN	LED_SMD:LED_0805_2012Metric	D1
1	OUTA	LED_SMD:LED_0805_2012Metric	D2
1	OUTB	LED_SMD:LED_0805_2012Metric	D3
1	PWR	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J5

Questions

How big is the Test register PCB?

It measures 88.9 × 47 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Test register use?

43 parts, built around the 74LS245SC and 74LS377PC. 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 Test register KiCad files?

From the pottsali/cpu-pub repository on GitHub, at the commit this page was made from: the board is schematics/misc/test_register/test_register.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Test register design in my own project?

Its repository states no licence, so its author keeps all rights: ask pottsali before reusing the design.

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/pottsali-cpu-pub-test-register" title="Test register in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/pottsali-cpu-pub-test-register.jpg" alt="Test register" width="1200" height="900">

A picture that opens the board, for a README

[![Test register](https://pcbkit.io/embed/boards/pottsali-cpu-pub-test-register.jpg?size=s)](https://pcbkit.io/boards/pottsali-cpu-pub-test-register)

Source

Repository: pottsali/cpu-pub
Board file: schematics/misc/test_register/test_register.kicad_pcb
Commit: b35fc99
Licence: Not stated

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