Hi All, In R4000 & descendent processors, interrupt number 7 is being used for internal timer interrupt. From this i understand that the timer interrupt is also maskable when the IE bit in status register is cleared. If somebody mask this interrupt for a long time erroneously, then won't there be a problem in maintaining the system time? Please correct me if i am wrong.. Does the system time is maintained via NMI? Thanks in advance, -karthi ===== The expert at anything was once a beginner ______________________________ / \ O / Karthikeyan.N \ O | Chennai, India. | `\|||/' \ Mobile: +919884104346 / (o o) \ / _ ooO (_) Ooo____________________________________ _____|_____|_____|_____|_____|_____|_____|_____|_ __|_____|_____|_____|_____|_____|_____|_____|____ _____|_____|_____|_____|_____|_____|_____|_____|_ ________________________________________________________________________ Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now http://uk.messenger.yahoo.com/download/index.html