Description

This repository contains the reference design for a 3.3V version of the Apple IIe's IOU custom IC.
The RTL (VHDL source code) project is located here: RTL for the Apple IIe's MMU and IOU

Project status

Acknowledgements

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.

And lastly, a special thanks to Leeland Heins @SoftwareJanitor, who thoroughly tested this project. His steady encouragement was a much-appreciated source of motivation during the tougher stretches of development.

The IOU Adapter

Buying the IOU Adapter
The two official stores where to buy the IOU adapter are ReActiveMicro and Ralle Palaveev's store.

Ralle Palaveev's store
ReActiveMicro (Available soon)

Building it yourself
Gerbers, production files, and instructions are located in production

Tested Hardware

Category	Hardware Components
Motherboards	Rev.B motherboard (NTSC) ReActiveMicro IIe motherboard (NTSC) Pravetz 8E Pravetz 8A
CPUs	Synertek 6502 (unenhanced ROMs) Rockwell R6502AP (unenhanced ROMs) UMC UM6502 (unenhanced ROMs) GTE G65SC02P-2 (enhanced ROMs) NCR 65C02 (enhanced ROMs) Rockwell R65C02P4 (enhanced ROMs) WDC 65C02S (with adapter)
AUX Cards	RAMWorks III (512M) 80-Column Expansion Card (820-0067-B) 80-Column Expansion Card (820-0067-D) AE Ramworks ][ Apple "Slinky" RAM card
ROMs	Enhanced ROM set (ReActiveMicro) Unenhanced ROMs: 342-0132-B 342-0133-A 342-0134-A 342-0135-A
Disk Interfaces/Drive	Apple 5.25" Drive Controller Card (655-0101-E) Disk ][ Interface Card (650-X104) Apple Disk II Drive NVRam Drive BOMW FloppyEMU A2DISK Franklin floppy controller
Other	Mouse Interface Card (670-0030-C) Thunderclock Plus A2VGA mouse emulation Booti TJ Boldt's ROM-Drive v4.0 Grappler+ A2DVI A2Pico A2VGA Romcard Romcard2 Romcard3 A2RESET v1,v2 AE Transwarp Titan Accellerator //e Ian Kim A2 Turbo MS Z80 Softcard clone

Other Projects

Other hardware reference designs are located here:

3.3V Adapter reference designs

• 3.3V MMU adapter

5V Adapter reference designs

• 5V IOU adapter (To be done)
• 5V MMU adapter (To be done)