HardLabs

Io card

nojan1·project-wrass·eda/io-card/io-card.kicad_pcb

Io card PCB layout, top view — open source board by nojan1

About the Io card PCB

Io card is an open source PCB design by nojan1, published on GitHub. It is a 2-layer board measuring 230 × 100 mm, with 61 components from 37 distinct parts.

Other key parts include the W65C22SxP, 74HCT14, NE555P, 74HCT00 and 74HCT595. By type, the board carries 17 capacitors, 14 ICs, 13 jumpers, 9 connectors, 7 resistors and 1 diode.

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.

Io card, from the project README
From the project README

Main components on the Io card

W65C22SxP74HCT14NE555P74HCT0074HCT59574HCT13874HCT14874HCT19374HC541LM317L_TO9274HCT574

Io card bill of materials (BOM)

61 components, 37 distinct parts.

QtyPartRefs
2
W65C22SxP
U1, U2
1
74HCT14
U3
1
NE555P
U4
1
74HCT00
U5
2
74HCT595
U6, U7
2
74HCT138
U8, U13
1
74HCT148
U9
1
74HCT193
U10
1
74HC541
U12
1
LM317L_TO92
U14
1
74HCT574
U15
1
PS2
J1
1
Conn_02x25_Odd_Even
J2
1
PortA
J3
1
PortB
J4
1
ControlLines
J5
1
SPI
J6
1
Keyboard connector
J7
1
SD-Card module
J8
1
SD_Card
J9
Show 17 more
QtyPartRefs
8
SolderJumper_2_Open
JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8
1
Enable PS2 Output
JP9
1
Enable Scanning Keyboard Output
JP10
1
Key present select
JP11
1
IRQ Select
JP12
1
SD-Card voltage select
JP13
1
1N457
D1
14
100nf
C1, C2, C3, C4, C6, C7, C8, C9 +6
1
220nf
C5
1
100nf
C15
1
100nf
C18
1
33k
R1
2
10k
R2, R5
1
1.5k
R3
1
22k
R4
1
220R
R6
1
370R
R7

Io card 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.

Io card: common questions

How big is the Io card PCB?

The Io card measures 230 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Io card?

61 components, from 37 distinct parts. The full bill of materials is listed on this page.

Where can I download the Io card 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 Io card 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