HardLabs

I8080-sbc

quasiengineer·i8080-sbc·pcb/i8080-sbc.kicad_pcb

I8080-sbc PCB layout, top view — open source STM32 board by quasiengineer
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About the I8080-sbc PCB

I8080-sbc is an open source STM32 PCB design by quasiengineer, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 111 components from 49 distinct parts.

Its main chip is the STM32G4A1KEUX, from the STM32 family. Other key parts include the SN74LVC861APW, CD74HC243M96, M2GL005-TQG144I, UCC27511DBVR and TXS0108EPWRG4. By type, the board carries 55 capacitors, 27 resistors, 14 ICs, 5 inductors, 3 connectors and 3 switches.

From the project

FPGA-based single board computer to run Intel 8080 CPU (up to 3.125Mhz)

Video about this project: [](https://www.youtube.com/watch?v=-_pdrvB2gD0 "Video about this project")

Here is shown only main part of the board:

Archive with gerber files and drill locations could be found here

There is compiled hex file in repository, that could be flashed to PCB.

To flash you can use your favorite JTAG probe and software by your choice. Or you can use default stm32 bootloader that supports uploading firmware via USB - just switch BOOT switch in direction to the USB connector.

I8080-sbc, from the project README
From the project README

Main components on the I8080-sbc

SN74LVC861APWCD74HC243M96M2GL005-TQG144IUCC27511DBVRTXS0108EPWRG48080ALX7167ACLDMP3438ICL7660APX803-31SAG-7STM32G4A1KEUX

I8080-sbc bill of materials (BOM)

111 components, 49 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
SN74LVC861APW
IC1, IC2
1
CD74HC243M96
IC5
1
M2GL005-TQG144I
IC6
2
UCC27511DBVR
IC7, IC8
1
TXS0108EPWRG4
IC9
1
8080A
U1
2
LX7167ACLD
LX7167ACLD-TR
U2, U8
1
MP3438
U3
1
ICL7660
U4
1
APX803-31SAG-7
U6
1
STM32G4A1KEUX
STM32G4A1KEUx
U7
1
520-160-10-36CKM-TR3
16Mhz, CL=10p
Y1
1
16MHZ
16Mhz
Y2
1
656-DX07S016JA1R1500
Type-C
J1
1
649-1012937990701BLF
FPGA JTAG
J2
1
649-1012937990701BLF
MCU JTAG
J4
1
SLW-121586-5A-D
BOOT_MODE
SW1
1
710-435451019820
RESET_MCU
SW2
1
710-435451019820
RESET_FPGA
SW3
1
710-150080RS75000
Red
D1
Show 29 more
QtyPartRefs
1
710-150080GS75000
Green
D2
1
652-MG2029-101Y
Ferrite_Bead
FB1
1
81-DFE252012F-8R2MP2
8u2, 800mA
L1
1
27N
27n
L2
2
652-SRP2512-R68M
0u68, 5.5A
L3, L4
5
1u
C1, C7, C25, C57, C62
34
100N
100n
C2, C3, C6, C11, C12, C13, C17, C18 +26
1
187-CL21A475KAQNNNE
4u7, low-ESR
C4
4
22U
22u
C5, C59, C61, C64
1
187-CL21A106KAYNNNF
10u, low-ESR
C8
3
187-CL21A106KAYNNNF
10u
C9, C10, C55
2
10P
10p
C20, C27
1
187-CL21A475KAQNNNE
4u7
C30
2
10P
10p
C42, C45
1
33P
33p
C60
1
22P
22p
C63
2
10
R1, R18
4
100K
100k
R2, R13, R14, R23
2
30K
30k
R3, R6
1
4K7
4k7
R4
1
330K
330k
R5
1
2K2
2k2
R7
5
10K
10k
R8, R10, R19, R20, R21
3
220
R9, R11, R12
3
1k
R15, R16, R17
1
50
R22
1
158K
158k
R24
1
34K8
34k8
R25
2
5K1
5k1
R26, R27

I8080-sbc design files

The KiCad project lives in the quasiengineer/i8080-sbc repository on GitHub; these links point at the commit this page was built from.

I8080-sbc: common questions

What microcontroller does the I8080-sbc use?

The I8080-sbc is built around the STM32G4A1KEUX, from the STM32 family.

How big is the I8080-sbc PCB?

The I8080-sbc measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the I8080-sbc?

111 components, from 49 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 I8080-sbc design files?

From the quasiengineer/i8080-sbc 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 I8080-sbc design in my own project?

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

Can I test firmware for the I8080-sbc without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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