Upgrading my old I/O board for low lag input devices

[sk8er000]

Hello,

I've bought my mister a while ago and it came with the LLAPI input device from bootsector. It works really but I'd like to try snac too (mainly because of the possibility to use a USB device too).

My questions are:

I've read that for some adapters like the mega drive one I need the last revision due to a lack of connections on older revisions. Is it possible to find a scheme to add those connections to my 5.5 I/O board?

How is possible that my actual LLAPI input device is working with a 6 button controller with my actual I/O board?

Thank you in advance

[drgruney]

Sorry this doesn't really address your question, but ... What do you mean by "use a USB device too"?

SNAC uses the user serial port, which is physically a USB 3.0 connector, but it is not a functional USB port.

[sk8er000]

I'm sorry for the confusion, I meant the adapter for USB controller (serial port to USB):




EDIT:
OK I misread the functionality of SNAC I didn't notice that you need an adapter serial to usb and then add the usb adapter for the controller. I was thinking that using the serial to usb pcb it will allow to plug some usb controllers to the serial port of the mister..

Anyway the question regarding the I/O board mod to use all the required connection remains.

[sk8er000]

I compared the schemes of the 5.5 and 6.1 versions and I've tried to add IO6 signal and a pull up resistor for every serial signal:

9xtD1tV.jpeg (1.19 MiB) Viewed 2756 times

Now I need a SNAC with the genesis adapter to test if it works.
The pull up resistors solved the flickering inputs with a relatively long USB 3.0 cable using LLOAD input device

[drgruney]

One thing to keep in mind. SNAC adapters are moving to the HDMI connector, so SNAC and BLISS can use the same cables.

[sk8er000]

Finally I got enough components to assemble a USB snac and a couple of adapters (I'm still waiting PCBs for HDMI snac, PCE SNAC, cables, ports and some LLAMA adapters ) but I was able to test the mega drive PCB with a 6 buttons controller and I can confirm that the mod is working!

wS9kFoT.jpeg (984.32 KiB) Viewed 2505 times

hC8Qgo8.jpeg (865.12 KiB) Viewed 2505 times

O3hNkHO.jpeg (726.3 KiB) Viewed 2505 times