PCBs for USB Datasette and Wiimote2Amiga arrived

My USB Datasette and the Wiimote-Amiga-Joystick-Adapter (now better called "Wiimote2Amiga") finally reached the state of being implemented on professional PCBs using the company PCB-Pool.

2 "USB Datassettes" and 3 "Wiimote2Amiga" Boards are left

USB Datasette

Top: Old version with stripboard and cables. Bottom: New version with just one PCB.

The cables that were required for the connection to the datasette and the C64 itself are now gone and replaced with an edge connector and a female connector. This way it's a little bit more compact and less "wiry".

It even has a "feature" that you get if you design hardware without looking at the port locations.

WHY THERE IS IEC PORT? - Rage-Face from http://alltheragefaces.com

But as the main purpose of the device is the connection to the datasette without the usage of the c64 itself this is not that of a matter.

Wiimote2Amiga

Left: STEITEC Evalkit Version, Right: New PCB with everything in one.

The board equipped to my 1200 with plugged in bluetooth stick.

As this project never leaved the evaluation board before, this was my first circuit board with an LPC1768 controller. And of course this leads to some errors that are clearly visible in the photo.....
The current needed to drive this project is reduced by a fifth to 70mA (@5V) which is great for the Amiga 1200 which has a resistor in series at the joystick port effectively reducing the possible current you can draw.
Also the size of the device is now greatly reduced to 48x48 mm and should be small enough to be placed inside the "rear trap door" of an Amiga 1200 to make it even more compact.
To reduce problems with the C64's sound this board offers the possibility to disconnect the power supply of your computer from the device and a port to connect an external 5V source.

Conclusions

In the past I preferred designing with stripboards as they could be developed and debugged easily and incremental. But the beauty and cleannines of real etched PCBs is just untouchable.
As I had a minimum order quantity with boards as small as this I decided to sell the remaining unequipped boards for the cost price if there is interest.

Of course there is no warranty and I'm a little bit pedantic about releasing source code. ;-)

Slamy's USB Datasette

Let's have a look at the USB Datasette I've made about 2 years ago if I remember correctly. The purpose of this device is the writeback of legacy tape images to real tapes.

The device itself

The device is constructed using some stripboard and a PIC 18F2450. The nice thing about this PIC is that it has a complete USB device controller that has a lot more features than your average "ftdi to uart"-solution.

A linux driver was built which is able to read spectrum (.TZX and .TAP), c64 (.TAP) and cpc (.CDT) tape images. It interprets the images and extracts the pulses that are used to encode the data. The length of these pulses are transfered to the pic using libusb and interrupt transfers. The program inside the microcontroller puts these inside a fifo and gives the resulting signal to the output.

The whole kit

The device offers three connectors as seen in the first picture above.

The  left pin header next to the oscillator is used to connect to a tape

device. First a cable for the c64 datasette and then one that can be used for the internal drive of a zx spectrum +2A.

The female connector right next to it is used for a connection to a computer itself. It can be used for connecting a c64 and the internal header inside the +2A. The driver is also capable of stopping the playing process if the c64 disables the motor signal. In this case it operates as a tape emulator.

The last connector is your average line out but with reduced volume as it has to be connected the mic port of an tape recorder used for external connection to the cpc and the spectrum.

Let's have a look at some example photos.

Connected to a tape recorder

Connected to a C64c

Connected to a C64 datasette

Connected to a ZX Spectrum +2A and it's internal drive

A few words to the last picture: The Spectrum +2A doesn't offer the possibility to connect an external tape recorder like it was done with the 48k and the 128k. There exists a hack. But its a destructive one so i didn't used it. I've built myself a cable to extend the internal tape header to move it to the outside of the spectrum. This way I can connect the mainboard to the internal tape drive or an external source without opening it. Look at the photo as you can see both connectors hanging out.

Also as you can see there is a selfbuilt kempston interface as the "sinclair joystick ports" are pretty unusable if you don't own... sinclair joysticks ....

also the most games can handle kempston joysticks.

So this was everything I wanted to tell about this device, i guess. It took a few weeks to develop as a lot effort went into the linux driver. I don't know if its possible to port it to windows. The driver was written mainly in ANSI C so the only problem might be the part interfacing with libusb.

It's a very useful device and I've managed to write a few games using it. Of course these are official versions with copy protection and unmodified. I remember one game that my driver couldn't handle. It was a .CDT image with raw audio data inside. But that only happened once and an image like this is not very common.