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RAMROM 128k board

roberto314·Unicomp2·not produced boards/RAMROM_128k_board/RAMROM_128k_board.kicad_pcb

RAMROM 128k board layout, top view — open source STM32 board by roberto314
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About the RAMROM 128k board

RAMROM 128k board is an open source STM32 PCB design by roberto314, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 42 components from 18 distinct parts.

Its main chip is the STM32F411, from the STM32 family. Other key parts include the SN74LVC245ANSR, 74LS125, IS63LV1024L-10TL, 74LVC253 and 74LVC595. By type, the board carries 16 ICs, 9 capacitors, 8 connectors, 6 resistors, 1 transistor and 1 battery holder.

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 128k board, from the project README
From the project README

Main components on the RAMROM 128k board

SN74LVC245ANSR74LS125IS63LV1024L-10TL74LVC25374LVC59574AHC1G1474LS16574LVC13874HC59074LS08

RAMROM 128k board bill of materials (BOM)

42 components, 18 distinct parts.

QtyPartRefs
1
SN74LVC245ANSR
U1
1
74LS125
U2
2
IS63LV1024L-10TL
U3, U5
1
74LVC253
U6
2
74LVC595
U7, U10
2
74AHC1G14
U8, U12
1
74LS165
U9
2
74LVC138
U16, U17
3
74HC590
U18, U19, U20
1
74LS08
U21
1
PMV450ENEAR
Q1
4
BUS
J1, J2, J3, J4
1
STM32F411
J6
3
.
J7, J8, J9
1
Battery_Cell
BT1
1
BAT54C
D2
9
100n
C1, C2, C3, C4, C5, C6, C8, C9 +1
6
10k
R1, R2, R7, R8, R9, R10

RAMROM 128k 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 128k board: common questions

What microcontroller does the RAMROM 128k board use?

The RAMROM 128k board is built around the STM32F411, from the STM32 family.

How big is the RAMROM 128k board?

The RAMROM 128k board measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the RAMROM 128k board?

42 components, from 18 distinct parts. The full bill of materials is listed on this page.

Where can I download the RAMROM 128k 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 128k 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 128k 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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