test-drb September 2013

test-drb@ccmp.vtda.org

168 participants
203 discussions

You know you are a dedicated classic computer nut when

by cruff＠ruffspot.net

? after attending to the most pressing matters, you relocate some of the classic computing gear you have been collecting for your future hobby efforts from the basement to higher levels to avoid the water percolating in at the basement floor seams with the foundation due to the unprecedented rains in semiarid eastern Colorado. I've measured 10.3" since the storm started on Monday. This represents about 55% of the normal yearly precipitation for Boulder. This is not a good way to break the drought. Looking on the bright side, at least I won't have to water the yard for the rest of the year.

10 years, 8 months

Double sided 8" floppy in SA800 drive

by philip＠neoncluster.com

This may be a silly question, but I'm looking for confirmation that dssd (double sided single density) 8" floppies are usable in a sssd (single sided single density) drive such as the Shugart SA800. If so, can the floppy be manually flipped over and the other side also be read and written to, therefore having both side containing data? Phil philip at neoncluster.com Retro computing at: www.neoncluster.com

10 years, 8 months

SCSI to IDE & 256 Byte Sector OS's

by lynchaj＠yahoo.com

Thanks Wayne! I appreciate all your great support on S2I project. HINT HINT all SASI/SCSI-1 hobbyists! We need some compatibility testing in the worst way possible. HELP! Thanks and have a nice day! Andrew Lynch -------------------------------------------- On Mon, 9/16/13, Wayne Warthen <wwarthen at gmail.com> wrote: Subject: Re: [N8VEM-S2I:242] FW: [N8VEM: 16146] SCSI to IDE & 256 Byte Sector OS's To: n8vem-s2i at googlegroups.com Date: Monday, September 16, 2013, 2:14 AM Hi Clem, The firmware does not currently support 256 byte sectors, but it would be trivial to do so. ?The firmware is still in a "testing" mode and I am just waiting for anyone to get to the point where they are able to start testing. ?It is working perfectly for me in multiple systems, but so far I am the only one that has tested it. ?As soon as someone gets to the point of testing a board, I will gladly update the firmware as needed. Thanks, Wayne On Sunday, September 15, 2013 6:55:21 PM UTC-7, Norby wrote:There is a jumper defined to select between 256/512 sector sizes transfers (U35-D3). Not sure if the FW supports such configuration at this time.????From: n8ve... at googlegroups.com [mailto:n8ve...@ googlegroups.com] On Behalf Of Andrew Lynch Sent: Sunday, September 15, 2013 6:42 PM To: n8ve... at googlegroups.com Subject: [N8VEM-S2I:239] FW: [N8VEM: 16146] SCSI to IDE & 256 Byte Sector OS's?Hi Clem,The folks on N8VEM-S2I might be able to answer this question.? I believe the S2I is able to translate between 256/512 sector sizes.? Maybe Wayne could comment further on the topic. Thanks and have a nice day! Andrew Lynch?From: n8... at googlegroups.com [mailto... at googlegroups.com ] On Behalf Of ClemFM Sent: Sunday, September 15, 2013 7:04 AM To: n8... at googlegroups.com Subject: [N8VEM: 16146] SCSI to IDE & 256 Byte Sector OS's?Just a thought...........?Could you add an option to select 256 byte sector/block drives? The technique often used is to then "pad out" or skip the second 256 byte block of each sector.?The card would then work with many legacy systems such as: TRS-80, BBC, Atari etc - they all use 256 byte sectors whilst a hardware solution would avoid patching OS's.?Patching is fine, however I much prefer to just "plug & play" so to speak............?Clem-- You received this message because you are subscribed to the Google Groups "N8VEM" group. To unsubscribe from this group and stop receiving emails from it, send an email to n8vem+un...@ googlegroups.com. To post to this group, send email to n8... at googlegroups.com. Visit this group at http://groups.google.com/ group/n8vem. For more options, visit https://groups.google.com/ groups/opt_out.-- You received this message because you are subscribed to the Google Groups "N8VEM-S2I" group. To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s2i+...@ googlegroups.com. For more options, visit https://groups.google.com/ groups/opt_out. -- You received this message because you are subscribed to the Google Groups "N8VEM-S2I" group. To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s2i+unsubscribe at googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.

10 years, 8 months

Wanted: VAXstation 4000-90 PSU

by supervinx＠libero.it

Anyone has a spare VAXstation 4000/90 PSU? Mine is faulty: I could be able to repair it, no other technician could... Thanks! -- Vincenzo (aka Supervinx) --==ooOoo==-- My computer collection: http://www.supervinx.com/Retrocomputer --==ooOoo==-- You can reach me at: www.supervinx.com www.facebook.com/supervinx http://www.youtube.com/user/supervinx http://www.myspace.com/supervinx

10 years, 8 months

Unnoobing my noobness (TECO on RT-11)

by rick＠rickmurphy.net

At 11:18 AM 9/15/2013, Sander Reiche wrote: >Jerome, > >Works like a charm! Thank you very much indeed! >But, I follow DEC-11-UTECA-B-D (PDP-11 TECO User Guide) and the part >on the >ET flag (page 78) doesn't state anything about lower/uppercase. Only >the EU >flag which I didn't get to work at all. >Where did you find this amazing piece of information? It's in the TECO Pocket Guide - here's the ET bits for TECO-11 (with zero bits ignored): Bit Value Initial Value 0 0 2 1 if terminal is a scope 4 1 if terminal has lower case input 128 1 Before TECO's prompt 512 1 If terminal is a VT52 and VT52 Support is available 1024 1 If VT11 is present and VT11 support is available EU is an output flag - if EU = 0, the terminal cannot display lower case so TECO flags lower case characters. If EU = -1, the terminal supports lowercase output. Another reference is the "Standard TECO" (sic) guide: <http://h71000.www7.hp.com/doc/73final/documentation/pdf/teco.pdf>http://h71000.www7.hp.com/doc/73final/documentation/pdf/teco.pdf Section 5.16 describes the ET and EU flags. 73, -Rick

10 years, 8 months

Wanted: Odd and Interesting machines and old terminals

by slandon110＠gmail.com

Guys im looking for something Odd to add to my collection, a mini computer of sorts, something thats not mainstream like the apple stuff or my commodore stuff. Something that runs some flavor of unix. Ill be at VCFMW/ECCC with a ton of goodies for trade, or just let me know what you have. Im also looking for a VT100 Terminal or compatible Thanks Steve

10 years, 8 months

VAXstation Monitor Cable Trouble

by cctech＠beyondthepale.ie

Fred wrote: > > >I have a BC18Z I have for connecting the VAXstation to the monitor, keyboard > > >and mouse. With this cable, a red hue across the whole screen flashes on and > > >off about once a second, the other colours are fine and the screen is > > >legible. There is also a thin dark line that scrolls up the screen > > >continuously. This happens on two different monitors. I don't think it is > > >the VAXstation itself either, because swapping with another cable the > > >problem goes away. > On Sun, 15 Sep 2013, Peter Coghlan wrote: > > Me too! > > I have a VAXstation monitor cable that does that too or something very > > like it. > > >I tested continuity of the red wire and it seems fine. Are there any > > >components in the keyboard and mouse connector block that could cause this? > > It's been a while since I looked at the problem and I don't know where the > > cable is now. I think I did a DC comparison between the bad cable and a > > working cable and failed to find any difference. > > Unfortunately, the only solution I could come up with was the same one you did, > > use a different cable :-( > > Would that be an issue that DC/continuity checking does not reveal > problems at higher frequencies, such as inductive coupling between wires, > etc.? > Seems plausable. Finding or making some sort of DA15 breakout device might be useful to track it down. Disconnecting each of the keyboard and mouse signals in turn might reveal if one of those is responsible. Just putting a scope on them might show which is a likely culprit. However, knowing which signal is responsible won't help much unless it can be disconnected permanently. There are keyboard and mouse connectors on the system unit of some models of VAXstation 3100 but not on the VAXstation 2000. Regards, Peter Coghlan.

10 years, 8 months

Wierd AUI Connector on VAXstation 2000

by robert.jarratt＠ntlworld.com

I just collected a VAXstation 2000 that has an AUI connector on the back. The trouble is that the connector is a bit strange. It has screw holes like you might get for screwing in a serial cable or a video cable, rather than the locking slider that grips some studs on the cable you are connecting (or a transceiver in my case). Is it possible to get an AUI cable or a transceiver that will fit this connector or must I physically modify something I already have? Regards Rob

10 years, 8 months

VAXstation Monitor Cable Trouble

by cctech＠beyondthepale.ie

>I have a BC18Z I have for connecting the VAXstation to the monitor, keyboard >and mouse. With this cable, a red hue across the whole screen flashes on and >off about once a second, the other colours are fine and the screen is >legible. There is also a thin dark line that scrolls up the screen >continuously. This happens on two different monitors. I don't think it is >the VAXstation itself either, because swapping with another cable the >problem goes away. > Me too! I have a VAXstation monitor cable that does that too or something very like it. > > >I tested continuity of the red wire and it seems fine. Are there any >components in the keyboard and mouse connector block that could cause this? > It's been a while since I looked at the problem and I don't know where the cable is now. I think I did a DC comparison between the bad cable and a working cable and failed to find any difference. Unfortunately, the only solution I could come up with was the same one you did, use a different cable :-( Regards, Peter Coghlan.

10 years, 8 months

cctech Digest, Vol 121, Issue 18

by michael.99.thompson＠gmail.com

> > From: Kyle Owen <kylevowen at gmail.com> > Date: Sat, 14 Sep 2013 23:05:38 -0500 > Subject: Xebec Hard Sector Floppy System and Tennecomp Tape Drive > > Also, I haven't yet played with it, but I also have a Tennecomp tape drive > that uses radio-station-style 4-track "carts" to store data on serially. I > unfortunately do not have the controller card for it, hence my inability to > do much with it. I do have some tapes for it, however. > > Thanks, > > Kyle > The computer museum at the University of Stuttgart has a working Tennecomp tape drive connected to their Straight-8 and another newer 8. The RCS/RI group has a Tennecomp tape drive on their 8/I, but it is in unknown condition. -- Michael Thompson >

10 years, 8 months

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test-drb September 2013