From: David Wood (jbevren_at_starbase.globalpc.net)
Date: 2002-10-02 23:44:09
On Wed, 2 Oct 2002, groepaz wrote: > > mmmh... long ago i did the same and i _think_ getting rid of the > unstableness was as easy as adding a pullup-resistor. (i dont think i used > any inverters or sth that is) I was going to recommend this on the first posting, but thought I'd read through the whole thread first. :) coax ethernet is terminated to 50 ohms on each end (25 ohms overall) with one resistor across the line. SCSI is terminated to about 130 ohms, I cant remember the exact value, buy pulling 220 ohms against +5 and 330 against ground on each end of the line. You may want to try one or both of these termination schemes. The first gives a nice 10mhz lowvoltage signalling rate, and the second, with good cabling, can give a 40mhz signalling rate using high-current drivers. The actual values of the resistors used for termination here shouldnt be used as a concrete value when choosing your termination, as they're optimised for circuits other than the CIA sp's. Make sure you terminate both data -and- clock also. -David Message was sent through the cbm-hackers mailing list
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