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RAMROM 512k board

roberto314·Unicomp2·RAMROM_512k_board/RAMROM_512k_board.kicad_pcb

RAMROM 512k board layout, top view — open source STM32 board by roberto314
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About the RAMROM 512k board

RAMROM 512k board is an open source STM32 PCB design by roberto314, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 54 components from 21 distinct parts.

Its main chip is the STM32F401, from the STM32 family. Other key parts include the SN74LVC245ANSR, 74LVC125, 74LVC1G32, IS61C5128AL-10TLI and IS63LV1024L-10TL. By type, the board carries 19 ICs, 15 connectors, 11 capacitors, 8 resistors and 1 transistor.

It belongs with the retro computing designs in this gallery.

From the project

A modular 8-bit Computer able to recreate (nearly) every Retro computer of the late 70s to mid 80s.

A modular 8-bit Computer able to recreate (nearly) every microcomputer of the mid 70s to early 80s in Hardware without FPGAs (although an FPGA can be added). Can also be used as a teaching tool for:

VHDL or Verilog C RTOS (STM32F401 runs ChibiOS Link: https://www.chibios.org) Python bash and linux in general (Olimex board runs linux with fbterm and tmux) Harwaredesign Timing of CPUs maybe Assembler SPI and I2C Interfaces CPLDs and FPGAs

RAMROM 512k board, from the project README
From the project README

Main components on the RAMROM 512k board

SN74LVC245ANSR74LVC12574LVC1G32IS61C5128AL-10TLIIS63LV1024L-10TL74LVC25374LVC59574AHC1G1474HC165DS108574LVC13874HC59074LVC08AD

RAMROM 512k board bill of materials (BOM)

54 components, 21 distinct parts.

QtyPartRefs
1
SN74LVC245ANSR
U1
2
74LVC125
U2, U13
1
74LVC1G32
U3
1
IS61C5128AL-10TLI
U4
1
IS63LV1024L-10TL
U5
1
74LVC253
U6
2
74LVC595
U7, U10
2
74AHC1G14
U8, U12
1
74HC165
U9
1
DS1085
U11
2
74LVC138
U16, U17
3
74HC590
U18, U19, U20
1
74LVC08AD
U21
1
PMV450ENEAR
Q1
4
BUS
J1, J2, J3, J4
10
.
J5, J7, J8, J9, J10, J11, J12, J13 +2
1
STM32F401
J6
11
100n
C1, C2, C3, C4, C5, C6, C7, C8 +3
2
10k
R1, R2
4
3k3
R3, R4, R5, R6
Show 1 more
QtyPartRefs
2
10k
R7, R8

RAMROM 512k board design files

The KiCad project lives in the roberto314/Unicomp2 repository on GitHub; these links point at the commit this page was built from.

RAMROM 512k board: common questions

What microcontroller does the RAMROM 512k board use?

The RAMROM 512k board is built around the STM32F401, from the STM32 family.

How big is the RAMROM 512k board?

The RAMROM 512k board measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RAMROM 512k board?

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

Where can I download the RAMROM 512k board design files?

From the roberto314/Unicomp2 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the RAMROM 512k board design in my own project?

The repository has no license, so all rights stay with roberto314. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the RAMROM 512k board 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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