K8055 4MHz or 6MHz

Hello together,
I just try to set up a custom PCB by using the velleman K8055 Controller. I’ve seen that the 8055 was made in different versions. I have 2 set here on my table with a PIC18F24J50 Controller and a 4MHz Crystal. In the schematic i find a 6MHz one. Is it a wrong component in the kit? If not where can i find the latest version of the schematic?

Your versions seem to be K8055N.
The 4MHz crystal is the right one for this version.
In the previous version K8055 the crystal was 6MHz.
You’ll find the schematic and the assembly instructions for the K8055N here:

Ok thanks! Is it possible to purchase the programmed PIC only?