I'd share with you this MOD from my colleague Edu Araba to add an extra USB on The C64 Maxi. The idea is to convert TheC64 Maxi keyboard to an USB keyboard to use it with a Raspberry Pi, Myst, etc... But I'm so sorry because it's in Spanish!!!
It need converting into English and then posted here(I don't mean just a link, I have done it for you ,in English with pictures on the post then at the end link to the site where it came from), I have seen it before, when looking for picture of the C64 Maxi USB Hub.
Before the end of the year I will take the advantage and publish my last article. This time the possibility of converting the keyboard of the new C64 MAXI to USB.
This phrase has a trick , since the keyboard itself is already USB but does not have a connector for it. Likewise, the C64 MAXI has a usb HUB (which comes to replace the DB9 connectors of the original c64). This HUB can also be used to have more USB connectors. This modification is necessary especially if we want to put another device that supports USB keyboards, for example RASPBERRY PI, MIST, PC or a MAC MINI, in short, a host that supports usb keyboards.
C64 MAXI The C64 MAXI has something that I like, I already mentioned it in forums a few days ago, having this possibility, that of converting the keyboard to USB, it is not necessary to damage an original C64 to modify it and put a Keyrah adapter, as I did some time ago. time with my C128 and C64.
Apart from buying an original C64 and this one, we will save almost half the price because the MAXI already offers a good finish, even for the most purist. Honestly when buying the C64 MINI I regretted a little, but with this, having this possibility, the truth is that the price is not bad for what it offers.
Necessary materials To make this modification we will need:
1 strip of simple 2.00mm pins.
These components are easily available at any electronics store, ebay or aliexpress.
The modification For this modification, we can do it in two different ways, the first is to convert only the keyboard to USB leaving the hub completely unusable. The second is taking advantage of the USB HUB but conditioning one of its ports to connect the USB keyboard (I have used the second option). We will start with the most "complex" option, the second.
The first thing we should know is the distribution of the pins.
C64 MAXI motherboard
HUB board pinout
To modify the HUB plate, we must do it in two steps, first we must add a microusb adapter insert.
The next thing is to add the keyboard connector to one of the pins of the available USB ports, I have used the one furthest from the power button. You need to have a 2.00 pin strip of pin spacing.
Once the modification is made, we put the board in place and connect our keyboard to the pins that we have soldered.
Finally we will connect the microusb cable from our insert to the host, be it a PI, PC, MIST, etc. e voila! we have a keyboard and usb hub.
First modification For this modification, we will only need 4 2.00mm pins and the same microusb insert that we used in the previous explanation.
In the following image you can see what the modification consists of. As you can see, the only thing we do is "adapt" one connection format to another.
I hope this little guide has been helpful. Remember, if you use these steps or mention them on your channel, don't forget to cite the source.
This will help you if you want to use the Raspberry PI inside the C64 Maxi's case plus still use the C64 Maxi too, all then you will need is a HDMI switcher, to switch from the RPI to THEC64 Maxi, then you could play Amiga Games that way..