actually, no. they are either pulled to ground, jumpered together, or connected together with diodes in various configurations depending on the code desired, they never have to be pulled up by the user, when the machine polls them it tries to pull one line up at a time and checks if the other 2 lines are high or low at that time, and then it does the same with the other sense lines one at a time. it's fairly clever actually. newer monitors actually can do it that way (pc's are similar) or actually have a serial port and talk to the computer when the computer ask allowing the monitor to give detailed capabilities information.
[EMAIL PROTECTED] wrote: > > >there is an apple tech note on how the > >monitor sensing works, generally the simpler codes are adequate for a > >multisync monitor, > >the ones that require diodes to implement are generally only needed for > >fixed resolution > >monitors. > > One of the problems with sense lines is they are input lines (requiring a > simple "pull-up" on all three lines, and "reading" all three at once) and ------------- > --------------------------------------------------------------- -- 1st-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> 1st PowerMacs list info: <http://lowendmac.com/lists/1st-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> List archive: <http://mail.maclaunch.com/lists/1st-powermacs/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
