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Apple IIe IOU 3V3

frozen-signal·Apple_IIe_IOU_3V3

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

Apple IIe IOU 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 47 components from 12 distinct parts.

Its main chip is the LCMXO2-256HC-4MG132C, from the FPGA family. Other key parts include the TLV75733PDBVR, TXU0101DRYR, 74LVC245ABQ,115 and TXU0204BQAR. By type, the board carries 25 capacitors, 14 resistors, 6 ICs and 2 transistors.

It belongs with the retro computing designs in this gallery.

From the project

Open source design files for the Apple IIe's IOU 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 IOU 3V3, from the project README
From the project README

Main components on the Apple IIe IOU 3V3

TLV75733PDBVRLCMXO2-256HC-4MG132CTXU0101DRYR74LVC245ABQ,115TXU0204BQAR

Apple IIe IOU 3V3 bill of materials (BOM)

47 components, 12 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TLV75733PDBVR
U1
1
LCMXO2-256HC-4MG132C
U2
1
TXU0101DRYR
U3
2
74LVC245ABQ,115
U4, U6
1
TXU0204BQAR
U7
2
BSS138
Q1, Q2
3
1UF
1uF
C1, C2, C25
16
100NF
100nF
C3, C4, C5, C6, C8, C10, C11, C13 +8
6
10UF
10uF
C7, C9, C12, C15, C19, C22
10
4.7K
R1, R3, R5, R6, R7, R8, R9, R10 +2
3
5.1K
R2, R12, R13
1
1K
R4

Apple IIe IOU 3V3 design files

The KiCad project lives in the frozen-signal/Apple_IIe_IOU_3V3 repository on GitHub; these links point at the commit this page was built from.

Apple IIe IOU 3V3: common questions

What microcontroller does the Apple IIe IOU 3V3 use?

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

How big is the Apple IIe IOU 3V3 PCB?

The Apple IIe IOU 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 IOU 3V3?

47 components, from 12 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 IOU 3V3 design files?

From the frozen-signal/Apple_IIe_IOU_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 IOU 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 IOU 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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