Path: utzoo!censor!geac!torsqnt!hybrid!scifi!bywater!uunet!easy!lron From: easy!lron@uunet.uu.net (Dwight Hubbard) Newsgroups: comp.sys.amiga.datacomm Subject: Re: 19200 baud amiga Message-ID: <18c3c536.ARN0e77@easy.hiam.com> Date: 2 Mar 91 18:59:50 GMT References: <2587@tmiuv0.uucp> <978@faatcrl.UUCP> <19116@cbmvax.commodore.com> <1022@faatcrl.UUCP> <19303@cbmvax.commodore.com> <1032@faatcrl.UUCP> <18bf2954.ARN0e27@easy.hiam.com> <19397@cbmvax.commodore.com> Reply-To: easy!lron@uunet.uu.net Followup-To: comp.sys.amiga.datacomm Organization: You must be talking about someone else. Lines: 22 In article <19397@cbmvax.commodore.com>, Randell Jesup writes: > In article <18bf2954.ARN0e27@easy.hiam.com> easy!lron@uunet.uu.net writes: > >I think a 4 byte FIFO would be insufficent, some of the Non-DMA drive > >controllers I've seen keep interupts disabled for up to a half a second and > >in that time period an HST can send 800+ bytes of data. A 4 byte FIFO isn't > > The RKM's have always said that Disable should never be held for > more than 250 microseconds. 500 milliseconds is 2000 times that. > Yep, they sure do. To bad some hard drive drivers don't seem to do so :-( BTW, I would like to add that if buffers are added I would like to see support for CTS/RTS flow control in hardware as well. All the buffers in the world aren't going to be any good unless you can keep them from overflowing and the current software based CTS/RTS flow control doesn't seem to drop RTS soon enough to stop the buffers from overflowing at 19.2K, a heavily loaded system makes the problem painfully evident. ---------------------------------------------------------------------- -Dwight Hubbard USENET : easy!lron@uunet.uu.net - -Kaneohe, Hawaii CFR : 31:910/101 (Dwight Hubbard) - ----------------------------------------------------------------------