Expansion backplane

nojan1·project-wrass·eda/expansion-backplane/expansion-backplane.kicad_pcb

Expansion backplane PCB layout, top view — open source board by nojan1

About the Expansion backplane PCB

Expansion backplane is an open source PCB design by nojan1, published on GitHub. It is a 2-layer board measuring 235.7 × 78.5 mm, with 19 components from 13 distinct parts.

Other key parts include the 74HCT245. By type, the board carries 10 connectors, 5 capacitors and 4 ICs.

From the project

The purpose of Project Wrass is to develop the Wrass 1.

The purpose of Project Wrass is to develop the Wrass 1.

A 6502 based computer having the following specs.

W65C02 running at 2Mhz Bankable RAM giving a total of approx 300KB of usable memory * Expansion bus for up to 16 devices

The 16KB ROM is bankable using an external switch. This allows the computer to run "2 sets" of software.

The existing one is a simple homebrew "monitor" giving access to simple read, write and jump commands.

Expansion backplane, from the project README — From the project README

Main components on the Expansion backplane

Expansion backplane bill of materials (BOM)

19 components, 13 distinct parts.

Qty	Part	Footprint	Refs
4	74HCT245	DIP-20_W7.62mm	U1, U2, U3, U4
1	OUT1	PinSocket_2x20_P2.54mm_Vertical	J1
1	OUT5	PinSocket_2x20_P2.54mm_Vertical	J2
1	PWR	TerminalBlock_Altech_AK300-2_P5.00mm	J3
1	IN	PinSocket_2x20_P2.54mm_Vertical	J4
1	OUT2	PinSocket_2x20_P2.54mm_Vertical	J5
1	OUT6	PinSocket_2x20_P2.54mm_Vertical	J6
1	OUT3	PinSocket_2x20_P2.54mm_Vertical	J7
1	OUT7	PinSocket_2x20_P2.54mm_Vertical	J8
1	OUT4	PinSocket_2x20_P2.54mm_Vertical	J9
1	OUT8	PinSocket_2x20_P2.54mm_Vertical	J10
1	1u	C_Radial_D8.0mm_H7.0mm_P3.50mm	C1
4	100nf	C_Rect_L7.2mm_W3.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2	C2, C3, C4, C5

Expansion backplane design files

The KiCad project lives in the nojan1/project-wrass repository on GitHub; these links point at the commit this page was built from.

Expansion backplane: common questions

How big is the Expansion backplane PCB?

The Expansion backplane measures 235.7 × 78.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Expansion backplane?

19 components, from 13 distinct parts. The full bill of materials is listed on this page.

Where can I download the Expansion backplane design files?

From the nojan1/project-wrass repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Expansion backplane design in my own project?

The repository has no license, so all rights stay with nojan1. Use it as a reference, and ask the author before reusing the design.

More boards in project-wrass