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101090 discussions

RX50 / RX33 Questions related to PDP-11's

by pete＠dunnington.u-net.com

On Oct 14, 18:28, Zane H. Healy wrote: > Subject: RE: RX50 / RX33 Questions related to PDP-11's > >What exactly do your "RX33's" do when you try to access them? > > They flicker briefly just prior to the machine complaining it can't boot. > I'm not sure I had them connected properly. I'll try the method Allison > suggested in a little bit. That sounds suspiciously like what the controller does to "sniff" an RX50. There's a bit of majic between the side select and track zero signals on an RX50, which the controller uses to test that it's a real RX50. > Well, the stickers are pretty hard to read, but if I'm looking at the right > two, they both say > > LMB617 or LM8617 > then one says 21725 or 217E5 > I'm pretty sure the second says 216E5 That's 23-216E5 and 23-217E5, the first version of the RQDX3 code. The second revision is 23-244E5 and 23-245E5, which I think does support RX33s. The 23- means a ROM and the E5 means 16Kbytes (ie a 27128 EPROM). > If these aren't ROMs that support RX33's which ones should I be looking > for, there is a chance one of my other RQDX3's that I've got in my spares > will work. There was a third version, which was a minor bugfix, 23-285E5 and 23-286E5. I'm looking for a copy of those for my archive... -- Pete Peter Turnbull Dept. of Computer Science University of York

27 years, 11 months

RX50 / RX33 Questions related to PDP-11's

by allisonp＠world.std.com

< I am almost sure you need a cable without the PC-twist. Also, you < probably need to set the drive select jumpers properly (Can somebody tel < us what to?). Remember that the PC-twist not only swaps over 2 of the < drive select lines, it also gives separate motor on signals for the 2 dr The "twist" cable only applies to PC or systems using PC patterned interfaces. It DOES NOT APPLY TO RQDX and distribution boards used in Qbus systems. RQDXn uses a single bussed motor on and drive selection by drive select jumper. If you use a RX33 drive try using only one for starters, that will lower the sillyness factor. If you media is RX50... why not use an RX50. If all else fails and your configuring a second system move the controller that works over to the target or move the target controller to the running system as a second drive/unit. Allison

27 years, 11 months

RX50 / RX33 Questions related to PDP-11's

by dburrows＠netpath.net

RX33's use a straight cable without the PC twist. I have several here but use only one at a time on my test beds. I have several from various pieces of DEC equipment and they all use the drive select jumpers with a straight cable. Dan Burrows dburrows(a)netpath.net -----Original Message----- From: Tony Duell <ard(a)p850ug1.demon.co.uk> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Thursday, October 15, 1998 5:58 PM Subject: Re: RX50 / RX33 Questions related to PDP-11's > > >What exactly do your "RX33's" do when you try to access them? > > They flicker briefly just prior to the machine complaining it can't boot. > I'm not sure I had them connected properly. I'll try the method Allison > suggested in a little bit. Do the drive spindle motors ever run? You can't read data from a disk that's not spinning. I am almost sure you need a cable without the PC-twist. Also, you probably need to set the drive select jumpers properly (Can somebody tell us what to?). Remember that the PC-twist not only swaps over 2 of the drive select lines, it also gives separate motor on signals for the 2 drives. -tony

27 years, 11 months

SWTP 6800 on Haggle

by paulk＠microsoft.com

There's a working SWTP 6800 machine on Haggle Online, complete with a doc set. Of course, since it's an Internet auction, he wants $1000 for it, but just in case someone's interested. http://www.haggle.com/cgi/getitem.cgi?id=201793143 Paul Kearns paulk(a)microsoft.com

27 years, 11 months

RX50 / RX33 Questions related to PDP-11's

by CLASSICCMP＠trailing-edge.com

>I am almost sure you need a cable without the PC-twist. Absolutely correct. > Also, you >probably need to set the drive select jumpers properly (Can somebody tell >us what to?). There's absolutely no need to guess on this subject - Terry Kennedy has collected a great amount of wisdom and experience on this subject in THIRD-PARTY-DISKS.TXT, a compendium of DECUServe conferences, available by anonymous ftp from ftp.spc.edu. The answer for the drive select jumpers is easy: first drive at DS0, second at DS1. The jumpers selecting motor speed control are a bit more complicated; Terry's collection of data covers several popular Teac drives, and if the answer isn't there browsing through the Teac jumper setting recommendations will quickly give the answer for any specific drive they've sold. Teac's faxback service is at +1 213 727 7629, and is a valuable source of technical data regarding the various drives and options they've produced (and still produce.) Tim.

27 years, 11 months

CNET Story (fwd)

by maxeskin＠hotmail.com

Is that a separate cable channel, or what (specify)? > > >The CNET producer who did the coverage of VCF 2.0 has sent me the >following: > >The piece on the festival is going to air this weekend on CNET Central. >Check out http://cnet.tv.com for airtimes... > >Sellam Alternate e-mail: dastar(a)verio.com >------------------------------------------------------------------------------- > > Coming in 1999: Vintage Computer Festival 3.0! > See http://www.vintage.org/vcf for details > [Last web page update: 09/28/98] > > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

27 years, 11 months

PROM Burner

by Innfogra＠aol.com

I have a couple of 29s for sale, several plugs and a copy of the manual. if anyone is interested. Paxton

27 years, 11 months

RL02 slides & brackets

by wanderer＠bos.nl

Hello All, Who can help me with a pair of RL01/RL02 slides and the 4 brackets? I want to mount my 3rd RL unit in the cabinet but don't have a 3rd pair of them. A payment can be discussed. Thanks, Ed -- The Wanderer | Geloof nooit een politicus! wanderer(a)bos.nl | Europarlementariers: http://www.bos.nl/homes/wanderer | zakkenvullers en dumpplaats voor Unix Lives! windows95 is rommel! | mislukte politici. '96 GSXR 1100R | See http://www.bos.nl/homes/wanderer/gates.html for a funny pic. of Gates!

27 years, 11 months

CNET Story (fwd)

by siconic＠jasmine.psyber.com

The CNET producer who did the coverage of VCF 2.0 has sent me the following: The piece on the festival is going to air this weekend on CNET Central. Check out http://cnet.tv.com for airtimes... Sellam Alternate e-mail: dastar(a)verio.com ------------------------------------------------------------------------------- Coming in 1999: Vintage Computer Festival 3.0! See http://www.vintage.org/vcf for details [Last web page update: 09/28/98]

27 years, 11 months

Franklin Ace 2100

by maxeskin＠hotmail.com

Better means any feature that would bias one towards one computer versus another. Did it include a z80, by any chance? On the back of this machine, there were some slot covers; did it take standard apple cards? > >I haven't tasted them yet ;) > > >I don't really know yet. I would believe that they added some features but >how would you define "better", more reliable, faster, bigger software >library? >All I can do is look at the specs and compare the two. > >Francois >------------------------------------------------------------- >Visit the desperately in need of update >Sanctuary at: http://www.pclink.com/fauradon > > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

27 years, 11 months

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