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Finally understand location 7 (incremented at 60Hz) setting it to -1 causes clock interrupt every jiffy Improve comments in dsktrans Clarify cnop/cskp usage in iread/iwrite code iwrite and iread have common code entry at iwrite save return address at iread and overwrites return address to "skp" inst entry at iread puts "nop" inst at iwrite "xct iwrite" skips on write entry