HardLabs

C64-Switchless-Multi-Kernal-27C256-adapter

bwack·C64-Switchless-Multi-Kernal-27C256-adapter·KiCad_shortboard/C64-Switchless-Quad-Kernal-Switcher.kicad_pcb

C64-Switchless-Multi-Kernal-27C256-adapter PCB layout, top view — open source AVR/Arduino board by bwack

About the C64-Switchless-Multi-Kernal-27C256-adapter PCB

C64-Switchless-Multi-Kernal-27C256-adapter is an open source AVR/Arduino PCB design by bwack, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 22.2 × 46.4 mm, with 14 components from 10 distinct parts.

Its main chip is the ATTINY85-20PU, from the AVR/Arduino family. Other key parts include the 74LS08. By type, the board carries 4 connectors, 4 jumpers, 3 resistors, 2 ICs and 1 capacitor.

It belongs with the retro computing designs in this gallery.

From the project

Kernal switcher for the C64/C64C/C128

C64 Switchless Multi Kernel Switch - 27C256/512 rom adapter for C64's and disk drives.

Designed by BWACK. CERN OPEN HARDWARE LICENSE v1.2 http://www.ohwr.org/

The CAD files are available on GitHub: https://github.com/bwack/C64-Switchless-Multi-Kernal-27C256-adapter

All text above must be included in any redistribution

A kernal ROM adapter and switcher for C64, C64C, 1541, 1541C and 1541-II. The software is written in the Arduino IDE.

Main components on the C64-Switchless-Multi-Kernal-27C256-adapter

ATTINY85-20PU74LS08

C64-Switchless-Multi-Kernal-27C256-adapter bill of materials (BOM)

14 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY85-20PU
ATtiny85-20PU
U1
1
74LS08
U2
2
01X14_PRECISION_PINLIST
01x14_precision_pinlist
J1, J2
1
27C256/512_28PDIP
J3
1
Wireconnections
J4
4
SolderJumper_2_Open
JP1, JP2, JP3, JP4
1
100NF
100nF
C1
1
1k
R1
1
3K3
3k3
R2
1
560
R3

C64-Switchless-Multi-Kernal-27C256-adapter design files

The KiCad project lives in the bwack/C64-Switchless-Multi-Kernal-27C256-adapter repository on GitHub; these links point at the commit this page was built from.

C64-Switchless-Multi-Kernal-27C256-adapter: common questions

What microcontroller does the C64-Switchless-Multi-Kernal-27C256-adapter use?

The C64-Switchless-Multi-Kernal-27C256-adapter is built around the ATTINY85-20PU, from the AVR/Arduino family.

How big is the C64-Switchless-Multi-Kernal-27C256-adapter PCB?

The C64-Switchless-Multi-Kernal-27C256-adapter measures 22.2 × 46.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the C64-Switchless-Multi-Kernal-27C256-adapter?

14 components, from 10 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the C64-Switchless-Multi-Kernal-27C256-adapter design files?

From the bwack/C64-Switchless-Multi-Kernal-27C256-adapter repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the C64-Switchless-Multi-Kernal-27C256-adapter design in my own project?

Yes, under the terms of its CERN-OHL-1.2 license, which bwack chose for the repository.

Can I test firmware for the C64-Switchless-Multi-Kernal-27C256-adapter without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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