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ECP uses a DMA channel and some external parallel-to-CD (Backpack) or parallel-to-SCSI (Trantor) adapter drivers don't work with it. EPP is fine with them (although EPP isn't an option on the 560 :-( Many printer drivers (notably HP) have enhanced reporting capabilities with bidirectional ports (vs SPP). Rich rpritz@interport.net on 01/12/98 08:13:11 PM To: sparker@torgo.punk.net cc: thinkpad@cs.utk.edu (bcc: Rich Chong/SHARE Inc) Subject: Re: ECP on 560 On Mon, 12 Jan 1998 17:03:39 -0800 (PST), Steve Parker <sparker@torgo.punk.net> wrote: >On Mon, 12 Jan 1998, richard wrote: > >> Should I configure the parallel port on my TP 560 as an "ECP", or is it >> safer to leave it as "bi-directional"? > > ECP is faster, bi-directional is safer. Use whatever works best with >your peripherals. How is bi-directional safer? More compatible with peripherals? Less likely to provoke system crashes? Something else? I'm using win95, btw.