HardLabs

Burstcart

ytmytm·plus4-burstcart·burstcart-cia/kicad/burstcart.kicad_pcb

Burstcart PCB layout, top view — open source AVR/Arduino board by ytmytm
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About the Burstcart PCB

Burstcart is an open source AVR/Arduino PCB design by ytmytm, published on GitHub. It is a 2-layer board measuring 56 × 91 mm, with 21 components from 14 distinct parts.

Its main chip is the ATtiny85-20P, from the AVR/Arduino family. Other key parts include the 27C512, CD74HCT4520E, 6526 CIA, 22V10 and C16_CARTRIDGE. By type, the board carries 6 ICs, 4 connectors, 4 jumpers, 4 capacitors and 3 resistors.

It belongs with the retro computing designs in this gallery.

From the project

Burst (fast serial) capable cartridge for Commodore C16/116/Plus4

This Plus/4 cartridge implements both fast serial burst for 1570/1571/1581 drives and a parallel connection for the 1541 drive, enabling high-speed data transfers.

The project started as a response to a question from Plus/4 World Forum.

In order to use the Burst (fast serial) protocol as implemented on the C128, we need a bidirectional hardware serial port.

The published version uses VIA 6522 chips, which are still relatively easy to obtain. The additional logic addresses a VIA hardware bug that can lead to framing errors and lost bits when the serial port is externally clocked, as is the…

Burstcart, from the project README
From the project README

Main components on the Burstcart

27C512CD74HCT4520E6526 CIA22V10ATtiny85-20PC16_CARTRIDGE

Burstcart bill of materials (BOM)

21 components, 14 distinct parts.

QtyPartRefs
1
27C512
U1
1
CD74HCT4520E
U2
1
6526 CIA
U3
1
22V10
U4
1
ATtiny85-20P
U5
1
C16_CARTRIDGE
U$1
2
IEC
J1, J2
1
BURST
J3
1
PORTA
J4
3
Jumper_3_Bridged12
JP1, JP2, JP4
1
C:HW/O:SW
JP3
4
470p
C2, C3, C4, C5
1
100
R1
2
3K3
R2, R3

Burstcart design files

The KiCad project lives in the ytmytm/plus4-burstcart repository on GitHub; these links point at the commit this page was built from.

Burstcart: common questions

What microcontroller does the Burstcart use?

The Burstcart is built around the ATtiny85-20P, from the AVR/Arduino family.

How big is the Burstcart PCB?

The Burstcart measures 56 × 91 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Burstcart?

21 components, from 14 distinct parts. The full bill of materials is listed on this page.

Where can I download the Burstcart design files?

From the ytmytm/plus4-burstcart repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Burstcart design in my own project?

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

Can I test firmware for the Burstcart 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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