One of the great things about the modern interconnected world is that it has become a lot easier to find who has already been banging their heads on similar problems, and what the possible solutions are.
Hardware Programming on the Oric
The reference documentation for all the Oric hardware hackers, on Fabrice Frances site.
The Oric Projects Page
A lot of interesting documentation, including the Oric Service Manuals, on Steve Marshall site.
Oric Microdisc controller
The Original. Supports up to four drives, 3", 3.5" or 5.25".
Jasmin floppy disk controller
The Jasmin was the low cost alternative to the Microdisc. Not compatible at all with the Microdisc.
Apple 2 disk controller interface
This interface was built in Bulgaria, and allows you to connect an Oric to an Apple 2 disk controller.
Oricutron's source code
In particular one may be interested by the way the Microdisc and Jasmin are emulated
This device helped plugging more than one board on the expansion bus.
The Oric IDE Interface
One of the earlier attempts at adding some modern hardware to the Oric, by Alexios Chouchoulas.
HcX Floppy Emulator
This device is an emulator of Floppy Disk Drive. It still requires a controller board, just imagine it as a virtual Drive you plug instead of your old rotative 3.5" drive.
There are two versions of this device, one uses an USB cable to connect to a PC, the other one uses a SD card to store image disks, with a small LCD screen and buttons to select the image.
SatanDisk and UltraSatan
This device is a complete SD-Card based SCSI harddrive emulation for the 16-32 bit Atari Machine.
The SatanDisk is the older model, supporting only one SD-Card, no hotplug, and quite unreliable. The UltraSatan is the successor, of the SatanDisk: Way faster, totally reliable, supports to SD-Card (the second one can be hot removed and plugged which is practical to exchange data with a pc without having to switch off the atari all the time).
SIO is the name of the expansion interface of the 8 bit Atari machines.
SIO2PC is an interface to connect an Atari to a PC and use it as a virtual disk drive. Exists in homebrew and commercial versions.