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8bit computer

vascofazza·8bit-cpu·MK1_CPU/8bit-computer/8bit-computer.kicad_pcb

8bit computer PCB layout, top view — open source AVR/Arduino board by vascofazza
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About the 8bit computer PCB

8bit computer is an open source AVR/Arduino PCB design by vascofazza, published on GitHub under the MIT license. It is a 2-layer board measuring 297.2 × 180.3 mm, with 327 components from 59 distinct parts.

Its main chip is the Arduino Nano, from the AVR/Arduino family. Other key parts include the 74HCT32, NE555, 74HCT04, 74HCT08 and 74HCT245. By type, the board carries 134 diodes, 81 ICs, 52 resistors, 45 capacitors, 10 switches and 3 connectors.

It belongs with the displays & leds designs in this gallery.

From the project

Schematics & code for my 74LS-based 8-bit MK1 CPU

Schematics and code for my home-made 8-bit CPU and its companion boards.

During the past month, I designed and built a programmable 8-bit CPU from scratch, out of basic series 74LS logic ICs.

This repository contains pictures, schematics, and code for this project and its companion boards.

The MK1 CPU is composed of several modules, all connected trough a common 8-bit BUS, the status of each module is shown by dedicated LEDs.

8bit computer, from the project README
From the project README

Main components on the 8bit computer

74HCT32NE55574HCT0474HCT0874HCT24574HCT27374HCT17374HCT0274HCT28374HCT15774HCT8674LS15774HCT10728C647SEGMENT_CC74HCT13974HCT16174HCT00CY6225674HCT193AM29F04074HCT13874HCT238Arduino Nano

8bit computer bill of materials (BOM)

327 components, 59 distinct parts — part numbers from the project's BOM.

QtyPartRefs
5
74HCT32
U1, U2, U12, U25, U28
4
NE555
U3, U6, U7, U33
2
74HCT04
U4, U60
7
74HCT08
U5, U10, U26, U27, U29, U58, U64
11
74HCT245
U8, U14, U42, U48, U49, U52, U56, U59 +3
8
74HCT273
U9, U19, U32, U34, U57, U61, U66, U81
1
74HCT173
U11
2
74HCT02
U13, U69
2
74HCT283
U15, U16
9
74HCT157
U17, U18, U20, U23, U45, U62, U63, U67 +1
3
74HCT86
U21, U22, U24
4
74LS157
U30, U31, U50, U51
2
74HCT107
U35, U71
1
28C64
U36
4
7SEGMENT_CC
U37, U39, U40, U41
1
74HCT139
U38
3
74HCT161
U43, U44, U72
2
74HCT00
U46, U55
1
CY62256
U47
2
74HCT193
U53, U54
Show 39 more
QtyPartRefs
4
AM29F040
U73, U74, U75, U76
1
74HCT138
U77
2
74HCT238
U78, U79
1
Arduino Nano
A1
1
USB_B-8BIT-COMPUTER-RESCUE
USB_B-8bit-computer-rescue
J1
1
Barrel_Jack_Switch
J2
1
EXT-CONN
J4
1
1M
RV1
1
Multiplier
SW1
1
Pulse
SW2
1
Manual
SW3
1
Prog
SW4
1
Address
SW5
1
Mode
SW6
1
Write
SW7
1
Show
SW8
1
Data
SW9
1
Reset
SW10
25
RED
D1, D2, D3, D4, D5, D6, D7, D8 +17
41
GREEN
D9, D11, D12, D13, D14, D15, D16, D17 +33
43
BLUE
D10, D72, D73, D74, D75, D76, D77, D78 +35
4
WHITE
D19, D20, D88, D89
21
YELLOW
D38, D39, D40, D41, D42, D43, D44, D45 +13
2
10µF
C1, C2
11
0.01µF
C3, C6, C7, C9, C19, C20, C24, C27 +3
2
1µF
C4, C8
19
0.1µF
C5, C10, C11, C12, C14, C15, C18, C22 +11
10
*
C13, C16, C21, C26, C31, C32, C33, C35 +2
1
0.01
C17
4
220
R1, R2, R23, R24
15
1K
R3, R5, R6, R7, R8, R9, R10, R11 +7
1
330K
R4
10
10K
R12, R18, R19, R20, R21, R22, R29, R30 +2
1
470
R13
1
100K
R16
1
10K
RN1
3
470
RN2, RN4, RN5
14
1K
RN3, RN7, RN9, RN10, RN11, RN12, RN13, RN14 +6
2
220
RN6, RN8

8bit computer design files

The KiCad project lives in the vascofazza/8bit-cpu repository on GitHub; these links point at the commit this page was built from.

8bit computer: common questions

What microcontroller does the 8bit computer use?

The 8bit computer is built around the Arduino Nano, from the AVR/Arduino family.

How big is the 8bit computer PCB?

The 8bit computer measures 297.2 × 180.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 8bit computer?

327 components, from 59 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 8bit computer design files?

From the vascofazza/8bit-cpu repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the 8bit computer design in my own project?

Yes, under the terms of its MIT license, which vascofazza chose for the repository.

Can I test firmware for the 8bit computer 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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