Nascom News­let­ter

2. Copy 48 characters from a specified memory address to the top line of the screen. The command is entered with at least one argument. The first argument entered is the memory address from which 48 characters are copied to the top line of the screen.

AAAA – memory address from which 48 characters are copied.

Using the top line has always been a bit of a problem. With the ‘t” command the top line can easily be used to hold titles or any other text which is best not scrolled.

Set user routine address for the ‘x’, ‘y’ or ‘z’ command

Sets up a specified value in one of the NAS-SYS arguments ARG8, ARG9 or ARG10.

The SYS-EX ‘x’, ‘y’ and ‘z’ commands use ARG8, ARG9 and ARG10 respectively, ta determine the memory address at which the required user routine is to be called. The ‘u’ command provides an easy method of setting a value in ARG8, ARG9 or ARG10.

The first argument determines for which command the memory address is being set. ‘1’ sets the memory address for the ‘x” command (ARG8). ‘2’ sets the memory address for the ‘y’ command (ARG9). ‘3’ sets the memory address for the ‘z’ command (ARG10). The second argument is the value to be set up for the appropriate command.

A – 1, 2 3 only. Selects ‘x’ ‘y’ or ‘z’
BBBB – memory address at which the user routine will be called.

This is just an easy method of setting up the last three NAS-SYS arguments independently and without having to alter or enter the values for the earlier arguments. The values which are set in the NAS-SYS arguments can be examined at any time by use of the SYS-EX ‘a’ command.

Verity named file

This command is identical to the SYS-EX ‘r’ command with two exceptions. The first exception is that the prompt for entry of the required file name is ‘vName:’. The second exception is that when a match between the required file name and a file name read from cassette tape occurs, the NAS-SYS Verify command is called. Therefore, the file is not loaded into memory.

This command is essential to check that a file written by the SYS-EX ‘w’ command can be successfully read.

Write named file