HardLabs

OpenAC1

davischris·OpenAC1·hardware/OpenAC-1/Open Apple 1 SBC.kicad_pcb

OpenAC1 PCB layout, top view — open source PIC board by davischris

About the OpenAC1 PCB

OpenAC1 is an open source PIC PCB design by davischris, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 191.5 × 97.6 mm, with 71 components from 48 distinct parts.

Its main chip is the PIC32MX250F128B, from the PIC family. Other key parts include the 74HCT138, 28C64/28C256, 74HCT00, HM62256BLP-7 and 74HCT04. By type, the board carries 18 capacitors, 18 resistors, 11 ICs, 11 connectors, 4 modules and 3 jumpers.

From the project

Schematic and circuit board were designed in KiCAD 6.0

Schematic and circuit board were designed in KiCAD 6.0

ROM image should be burned to an AT28C64 EEPROM

Main components on the OpenAC1

74HCT13828C64/28C25674HCT00HM62256BLP-774HCT04NE555PWD65C21/MC6821MCP23S17WD65C02/R6502L7805PIC32MX250F128BA13 SelectA14 SelectProg EnablePower

OpenAC1 bill of materials (BOM)

71 components, 48 distinct parts.

QtyPartRefs
1
74HCT138
U1
1
28C64/28C256
U2
1
74HCT00
U3
1
HM62256BLP-7
U4
1
74HCT04
U5
1
NE555P
U6
1
WD65C21/MC6821
U7
1
MCP23S17
U8
1
WD65C02/R6502
U9
1
L7805
U10
1
PIC32MX250F128B
U11
1
A13 Select
A1
1
A14 Select
A2
1
Prog Enable
A3
1
Power
A4
1
1MHz
X1
1
8MHz
Y1
1
BARREL_JACK
CON1
4
Hole
J1, J2, J3, J4
1
VP GND
J5
Show 28 more
QtyPartRefs
1
Arduino Nano
J6
1
CONN_02X22
P1
1
COMP VIDEO
P2
1
SD Card Module
P3
1
USB_A
P4
1
EXT RESET
JP1
1
Power Switch
JP2
1
EXT CLEAR
JP3
1
RESET
SW1
1
CLEAR
SW2
1
Power
D1
1
Activity
D2
11
100nF
C1, C4, C5, C6, C7, C8, C9, C10 +3
1
103
C2
2
10uF
C3, C17
2
27pF
C13, C14
1
104
C15
1
334
C16
5
3.3k
R1, R6, R7, R8, R10
1
1M
R2
1
47k
R3
1
1k
R4
1
330
R5
3
10k
R9, R12, R18
2
150
R11, R14
2
4.7k
R13, R17
1
220
R15
1
470
R16

OpenAC1 design files

The KiCad project lives in the davischris/OpenAC1 repository on GitHub; these links point at the commit this page was built from.

OpenAC1: common questions

What microcontroller does the OpenAC1 use?

The OpenAC1 is built around the PIC32MX250F128B, from the PIC family.

How big is the OpenAC1 PCB?

The OpenAC1 measures 191.5 × 97.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the OpenAC1?

71 components, from 48 distinct parts. The full bill of materials is listed on this page.

Where can I download the OpenAC1 design files?

From the davischris/OpenAC1 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the OpenAC1 design in my own project?

Yes, under the terms of its GPL-3.0 license, which davischris chose for the repository.

Can I test firmware for the OpenAC1 without the hardware?

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

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