kim@dde.dk (Kim Andersen) (10/05/89)
Hi, I have this `old' tektronix 4125 terminal. The normal communication line for this is RS-232 at maximum speed 38400. Now the question: Has anyone pointers / ideas for speeding up the communication ? The preferable solution would be an ethernet plug-in. I have been in contact with the local Tek representative, but their solution require buying a Tek computer. -- -- Kim Andersen @ Dansk Data Elektronik A/S, Herlev, Denmark. E-mail: kim@dde.dk or ...!uunet!mcvax!dkuug!dde!nessie!kim
tomg@hpcvlx.cv.hp.com (Thomas J. Gilg) (10/09/89)
> I have this `old' tektronix 4125 terminal. > The normal communication line for this is RS-232 at > maximum speed 38400. > > Now the question: > Has anyone pointers / ideas for speeding up the communication ? > The preferable solution would be an ethernet plug-in. If I'm not mistaken, a DMA connection is available for some non-TEK computers, including the VAX series. During my college days at Montana State, we had a TEK-4129 DMA'ed into a VAX 11-750. Thomas Gilg tomg@cv.hp.com
burzio@mmlai.UUCP (Anthony Burzio) (10/10/89)
In article <101880013@hpcvlx.cv.hp.com>, tomg@hpcvlx.cv.hp.com (Thomas J. Gilg) writes: > > I have this `old' tektronix 4125 terminal. > > The normal communication line for this is RS-232 at > > maximum speed 38400. > > > If I'm not mistaken, a DMA connection is available for some non-TEK > computers, including the VAX series. During my college days at > Montana State, we had a TEK-4129 DMA'ed into a VAX 11-750. The DMA connection does not work in a LAVC (local area VAX cluster). We tried out a DMA card in our uVAXII but got extremely poor performance (worse than RS-232) because of bus contention. Tektronix could not fix the problem so we didn't get the DMA card (got a TurboSRX instead :-) ********************************************************************* Tony Burzio * Speed! More speed! Martin Marietta Labs * mmlai!burzio@uunet.uu.net * *********************************************************************
kurtk@tekcae.CAX.TEK.COM (Kurt Krueger) (10/11/89)
Contact you local Tektronix sales rep. There is a board for the 4125 (etc.) terminal that will connect to a Vax DMA interface. Pretty impressive. The hardware vector generator on the 4125 is MUCH faster than any rs-232 line. Full pixel images (1024x1280x8) can be transmitted in about 2 seconds (or less). These images take about 20 minutes at 19.2 Kbaud.