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Apple IIe MMU 3V3

frozen-signal·Apple_IIe_MMU_3V3

Apple IIe MMU 3V3 PCB layout, top view — open source FPGA board by frozen-signal
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About the Apple IIe MMU 3V3 PCB

Apple IIe MMU 3V3 is an open source FPGA PCB design by frozen-signal, published on GitHub under the CC-BY-4.0 license. It is a 4-layer board measuring 17.5 × 51.3 mm, with 41 components from 9 distinct parts.

Its main chip is the LCMXO2-256HC-4MG132C, from the FPGA family. Other key parts include the 74LVC245ABQ,115, TXU0101DRYR and TLV75733PDBVR. By type, the board carries 24 capacitors, 10 resistors and 7 ICs.

It belongs with the retro computing designs in this gallery.

From the project

Open source design files for the Apple IIe's MMU custom IC

This project was made possible thanks to the support and contributions of a few key individuals. Notable thanks go to: Henry S. Courbis of ReActiveMicro not only was instrumental in the development of the VHDL code but also was the spark that initiated this project. His generous support and deep technical insight made this project possible. Ralle Palaveev is more than a contributor -- he is the co-creator of the 3.3V adapters. His impressive skills made what seemed impossible look easy: fitting everything into a 40-pin DIP-sized PCB.

Apple IIe MMU 3V3, from the project README
From the project README

Main components on the Apple IIe MMU 3V3

LCMXO2-256HC-4MG132C74LVC245ABQ,115TXU0101DRYRTLV75733PDBVR

Apple IIe MMU 3V3 bill of materials (BOM)

41 components, 9 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LCMXO2-256HC-4MG132C
U2
4
74LVC245ABQ,115
U3, U6, U7, U8
1
TXU0101DRYR
U9
1
TLV75733PDBVR
U10
16
100NF
100nF
C1, C2, C4, C6, C7, C8, C9, C11 +8
6
10UF
10uF
C3, C5, C10, C13, C16, C19
2
1UF
1uF
C23, C24
1
1K
R1
9
4.7K
R2, R3, R4, R5, R6, R7, R8, R9 +1

Apple IIe MMU 3V3 design files

The KiCad project lives in the frozen-signal/Apple_IIe_MMU_3V3 repository on GitHub; these links point at the commit this page was built from.

Apple IIe MMU 3V3: common questions

What microcontroller does the Apple IIe MMU 3V3 use?

The Apple IIe MMU 3V3 is built around the LCMXO2-256HC-4MG132C, from the FPGA family.

How big is the Apple IIe MMU 3V3 PCB?

The Apple IIe MMU 3V3 measures 17.5 × 51.3 mm, has 4 copper layers and is 1.604 mm thick.

How many components are on the Apple IIe MMU 3V3?

41 components, from 9 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 Apple IIe MMU 3V3 design files?

From the frozen-signal/Apple_IIe_MMU_3V3 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 Apple IIe MMU 3V3 design in my own project?

Yes, under the terms of its CC-BY-4.0 license, which frozen-signal chose for the repository.

Can I test firmware for the Apple IIe MMU 3V3 without the hardware?

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

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