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Abex megaram

gianlucarenzi·abex-megaram

Abex megaram PCB layout, top view — open source STM32 board by gianlucarenzi
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About the Abex megaram PCB

Abex megaram is an open source STM32 PCB design by gianlucarenzi, published on GitHub under the GPL-2.0 license. It is a 2-layer board measuring 135.5 × 71.5 mm, with 57 components from 21 distinct parts.

Its main chip is the STM32F407IGTx, from the STM32 family. Other key parts include the ISSI61WV5128BL. By type, the board carries 25 capacitors, 20 resistors, 3 ICs, 2 jumpers, 2 switches and 1 diode.

From the project

Atari Memory Expansion for ABEX Bus

Atari MegaRAM Cart for ABEX =========================

This is a Atari MegaRAM Cart board, designed for the Atari PBI & ECI Bus EXtender or ABEX for short.

This Atari MegaRAM is a PortB/PIA emulator which can expand the internal memory of the Atari, using the memory mapped scheme used in the 80s/90s like CompyShop, RAMbo and others.

Rendered Images =============== # Front[](#features) # Back[](#features) # Overall[](#features)

Abex megaram, from the project README
From the project README

Main components on the Abex megaram

ISSI61WV5128BLSTM32F407IGTx

Abex megaram bill of materials (BOM)

57 components, 21 distinct parts.

QtyPartRefs
2
ISSI61WV5128BL
U1, U2
1
STM32F407IGTx
U3
2
CONN_01X02
BOOT0_MEM1, BOOT1_MEM1
1
CONN_01X03
FT232RPi.1
1
CONN_01X02
JP1
1
CONN_01X04
JP2
1
SW_Push
SW1
1
SW_DIP_x03
SW2
1
8Mhz
XT1
1
LED.GREEN
D1
20
100n
C1, C2, C3, C8, C10, C11, C12, C13 +12
2
2.2u
C4, C5
2
20p
C6, C7
1
1u
C9
1
100K
R1
3
0
R2, R9, R13
3
470
R3, R4, R5
5
4.7K
R6, R7, R8, R18, R19
2
220
R10, R20
4
10K
R11, R14, R15, R17
Show 1 more
QtyPartRefs
2
510
R12, R16

Abex megaram design files

The KiCad project lives in the gianlucarenzi/abex-megaram repository on GitHub; these links point at the commit this page was built from.

Abex megaram: common questions

What microcontroller does the Abex megaram use?

The Abex megaram is built around the STM32F407IGTx, from the STM32 family.

How big is the Abex megaram PCB?

The Abex megaram measures 135.5 × 71.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Abex megaram?

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

Where can I download the Abex megaram design files?

From the gianlucarenzi/abex-megaram repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Abex megaram design in my own project?

Yes, under the terms of its GPL-2.0 license, which gianlucarenzi chose for the repository.

Can I test firmware for the Abex megaram 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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