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APL1

acwright·APL1·Hardware/APL1/Rev 1.1/APL1.kicad_pcb

APL1 PCB layout, top view — open source AVR/Arduino board by acwright
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About the APL1 PCB

APL1 is an open source AVR/Arduino PCB design by acwright, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 150 × 100 mm, with 44 components from 27 distinct parts.

Its main chip is the ATMEGA1284-P, from the AVR/Arduino family. Other key parts include the 74LS04, 6502, 65C21, AS6C62256 and 74LS00. By type, the board carries 17 capacitors, 10 ICs, 9 resistors, 4 connectors, 2 crystals and 1 switch.

From the project

A homebrew Apple 1 replica

A homebrew Apple 1 replica built around the 6502 microprocessor, with a modern microcontroller-based terminal that adds PS/2 keyboard and serial input alongside the original ASCII keyboard interface.

- Overview - Architecture - Hardware - APL1 Board - Revision History - Firmware - APL1 Controller - APL1 ROM - APL1 Terminal - CAD - Production - Schematics - Libraries - Bill of Materials - License

APL1, from the project README
From the project README

Main components on the APL1

74LS04650265C21AS6C6225674LS0074LS13828C6474LS245MAX232ATMEGA1284-P

APL1 bill of materials (BOM)

44 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74LS04
U1
1
6502
U2
1
65C21
U3
1
AS6C62256
U4
1
74LS00
U5
1
74LS138
U6
1
28C64
U7
1
74LS245
U8
1
MAX232
U9
1
ATMEGA1284-P
ATmega1284-P
U10
1
1MHZ
1MHz
Y1
1
28.636MHZ
28.636MHz
Y2
1
KEYBOARD
J2
1
5V DC
J4
1
PS/2
J5
1
VIDEO
J6
1
POWER
SW1
1
POWER LED
D1
10
100NF
100nF
C1, C2, C3, C4, C5, C6, C7, C8 +2
4
1UF
1uF
C11, C14, C15, C16
Show 7 more
QtyPartRefs
2
18PF
18pF
C12, C13
1
10UF
10uF
C17
4
4.7K
4.7k
R1, R2, R3, R4
1
330
R5
1
1k
R6
2
820
R7, R8
1
10K
10k
R9

APL1 design files

The KiCad project lives in the acwright/APL1 repository on GitHub; these links point at the commit this page was built from.

APL1: common questions

What microcontroller does the APL1 use?

The APL1 is built around the ATMEGA1284-P, from the AVR/Arduino family.

How big is the APL1 PCB?

The APL1 measures 150 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the APL1?

44 components, from 27 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 APL1 design files?

From the acwright/APL1 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the APL1 design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which acwright chose for the repository.

Can I test firmware for the APL1 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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