SIO2PI -> Raspberry Pi as a floppy

The Raspberry Pi is a small and inexpensive computer http://www.raspberrypi.org/faqs,
that can also emulate ATARI floppies.

It is shipped with UART.
To build a SIO2PI Adapter you will need a level shifter (3.3V <-> 5V).
There is an existing solution for it:
Logic Level Converter Sparkfun BOB-08745
http://www.sparkfun.com/products/8745

However one problem still exists.
The SystemOnChip used in Raspberry Pi http://www.raspberry...Peripherals.pdf supports UART with Handshaking, but the Raspberry Pi hardware developers decided for some reasons not to provide the CTS Signal on the GPIO header http://elinux.org/RPi_Low-level_peripherals

I found a workaround for it.
I have connected the "command" signal from SIO to one of the I/O PINs of the Raspberry Pi and adapted the Software (AspeQt).

Atari 2 Level Shifter

SIO 3 (data in) -->|--- TXO (Chan1) via diode (for example 1N5817) direction from Atari to the level shifter
SIO 5 (data out)	 - RXI (Chan1)
SIO 10 (+5V)		 - HV
SIO 4 (gnd)		 - GND
SIO 7 (command)	 - RXI (Chan2)

Level Shifter 2 Raspberry Pi

TXI (Chan1) - P1_08 (GPIO14 / TxD)
RXO (Chan1) - P1_10 (GPIO15 / RxD)
LV		 - P1_01 (+3,3V)
GND		 - P1_06
RXO (Chan2) - P1_11 (GPIO17)

Alternatively you can use USB2Serial adapter together with a SIO2PC adapter.
I have tested both variants (FTDI and Profilic).

To use UART for our goals, we need to edit two files on the Raspberry:
/boot/cmdline.txt
/etc/inittab
More details:
http://www.irrationa...is-serial-port/

Now we need the software.
I've tested two software tools with the Raspberry Pi:
- sio2bsd from drac030 http://drac030.krap....-inne-pliki.php
- AspeQt from Fatih Aygün http://sourceforge.n...rojects/aspeqt/

The first tool does not need hardware handshaking, so no changes were required in the code.
After adapting the makefile I could easily compile the code.
Thanks to drac030 I can offer you software download of the Raspberry Pi version (sio2bsd.tar.gz).

There were some problems with the AspeQt.
First of all - the Application Window is too big (if you use Composite Video signal of the Raspberry Pi).
So I build two vesions:
- a small size one (emulates only 4 drives)
- a standard one (has a "_hd" suffix)

Since some days there is a new version (0.8.7) of the tool available.
That's why I decided to build the following binaries:
aspeqt_0.6
aspeqt_0.6_hd
aspeqt_0.8.7
aspeqt_0.8.7_hd

The stable version 0.6 includes changes from Hias.

If you want to put AspeQt icon on the Raspberry Pi desktop, you should create a folder called "Desktop" in the "home" folder (/pi/home) and copy the "AspeQt.Desktop" file there.

Have Fun!