I need to send a STOP-A to my Sun console to drop it into its boot monitor. Using CRT attached to a serial port on the Sun, how can I accomplish this ?

When using a serial port on a Sun as the console, STOP-A is defined as the Break line condition. To generate a Break using CRT, you can use the F5 key if the VT220 keymapping is selected.

Break can also be generated using CTRL and the PAUSE/BREAK key when using any of the keymappings supplied with CRT.

You may also use the Keymap Editor to arbitrarily map the Telnet Function TN_BREAK to any key you wish.