How does debug mode on the host work?
If you load the TINY host with the /D parameter, it will start in debug mode. In this mode, the TINY host will write two letters to the upper-left corner of the text screen whenever a packet is received. This can be useful in debugging problems where you are not getting any response on the client. The letter in the first position simply cycles each time any request packet is received by the host. If you see this blinking/spinning when you run the client, at least you know that there is good connectivity between the host and the client and they are both set to use the same port. The second letter lets you know how the received packet was processed. Here are the possible codes…
