I could ask a number of questions here but firstly let me just say that on a Sun keyboard you can stop the boot process with STOP-A and if you're using a PC keyboard you can stop the boot process with CTRL-BREAK. However, as Don says, the system thinks that it doesn't have a keyboard. How is your minicom terminal physically connected?
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Also, read this thread..............
Can't use 'break' command, Can't access 'ok' prompt.
that I was involved in and DukeNuke2 solved it. Read DukeNuke2's post.
Hope that helps.