This is "The War of the Worlds", another of my dual CAV/CLV laserdiscs. Side 2 is CAV and we are going to use a variety of methods for passing F-Codes to the player. The important thing here isn't how we send the F-Codes, but what the F-Codes mean.

F-Codes are sent as ASCII characters, and consist of a string of one or more ASCII codes, always terminated with a carriage return.

Some F-Codes are a single character, others are two characters, and some require a numeric value to be included. Numeric values are passed as the individual ASCII codes of the number required, so for instance, to refer to frane number 500 in an F-Code, three bytes are required, being the ASCII code for "5", then the ASCII code for "0" and the ASCII code for "0" again.

The same rules apply when an F-Code response is sent from the player back to the computer.

The VP415 supports a large number of F-Codes and this picture set (and the corresponding CLV version) will show most of them, working through in numerical order of the F-code ASCII value.

The first shown here is * which means enter still mode.

Click here to return to using F-Codes with CAV