HECnet

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15589 discussions

Introducing myself... and my little network

by md.benson＠gmail.com

On 8 Jun 2012, at 08:23, Dave McGuire <mcguire at neurotica.com> wrote: I haven't tried cleaning TK50 heads in years, but I will (now that I have a more respectable workspace) start trying that. I will let you know how things go. I'll probably start digging into those within the next month or two. Thank you for the suggestion! I take it TK50 tapes won't read in a later drive? -- Mark Benson http://markbenson.org/blog http://twitter.com/MDBenson

13 years, 8 months

Introducing myself... and my little network

by mcguire＠neurotica.com

On 06/08/2012 03:17 AM, Johnny Billquist wrote: Ok. The next obvious thing is just cleaning. As with all tape drives, the heads needs cleaning once in a while. Get isopropanol, some cotton heads, and just clean them. If things still fails after that, then I don't have any more quick fixes. :-) But next to the pickup, the cleaning have fixed countless of them for me. I haven't tried cleaning TK50 heads in years, but I will (now that I have a more respectable workspace) start trying that. I will let you know how things go. I'll probably start digging into those within the next month or two. Thank you for the suggestion! -Dave -- Dave McGuire, AK4HZ New Kensington, PA

13 years, 8 months

Introducing myself... and my little network

by bqt＠softjar.se

On 2012-06-08 09:12, Dave McGuire wrote: On 06/08/2012 03:09 AM, Johnny Billquist wrote: The most common problem with the TK50 is that the tape pickup gets off the holding arm. Easy to fix if you are comfortable with a screw driver. I've had one or two TK50 go bad in other ways, but in my experience it's pretty uncommon for them to really break. It's almost always that pickup. Let me know if you need help understanding that. The "tongue"? Been fixing that problem for years. At one point I ordered a box of (I think) ten of those while DEC was still selling them as repair parts, but they're all gone now. Eventually the little grabber end breaks off due to plastic fatigue. The drives whose tongues are intact simply refuse to read and cause device timeouts. I have at least 7 or 8 in that condition, with no obvious mechanical flaws. I haven't dug into them very deeply. Ok. The next obvious thing is just cleaning. As with all tape drives, the heads needs cleaning once in a while. Get isopropanol, some cotton heads, and just clean them. If things still fails after that, then I don't have any more quick fixes. :-) But next to the pickup, the cleaning have fixed countless of them for me. Johnny

13 years, 8 months

promiscuous mode, was Re: [HECnet] Multinet Tunnel Connections to SG1::

by mcguire＠neurotica.com

On 06/08/2012 03:13 AM, Johnny Billquist wrote: But reading it through now, I see that there was one implicit assumption in my text which I could have pointed out. If you need to share the device with the system, while using a different MAC address, you need to place the device in promiscuous mode. And such is the case if we talk DECnet, since DECnet requires that you use a specific MAC address which is not the same as the default MAC address of a device. In the case of Linux DECnet, it actually changes the "main" MAC address of the interface, it doesn't add another one. Right. And in that case, you don't need promiscuous mode. We could go on about details, corner cases, other systems, potential network problems, and so on... But I think we both know what we're talking about, and I doubt we need to drag this any further. Contact me directly if you want us to continue. :-) I think what we need to do is convince Chrissie to continue working on her DECnet implementation. =) -Dave -- Dave McGuire, AK4HZ New Kensington, PA

13 years, 8 months

promiscuous mode, was Re: [HECnet] Multinet Tunnel Connections to SG1::

by bqt＠softjar.se

On 2012-06-08 09:07, Dave McGuire wrote: On 06/08/2012 02:00 AM, Johnny Billquist wrote: But reading it through now, I see that there was one implicit assumption in my text which I could have pointed out. If you need to share the device with the system, while using a different MAC address, you need to place the device in promiscuous mode. And such is the case if we talk DECnet, since DECnet requires that you use a specific MAC address which is not the same as the default MAC address of a device. In the case of Linux DECnet, it actually changes the "main" MAC address of the interface, it doesn't add another one. Right. And in that case, you don't need promiscuous mode. We could go on about details, corner cases, other systems, potential network problems, and so on... But I think we both know what we're talking about, and I doubt we need to drag this any further. Contact me directly if you want us to continue. :-) Johnny

13 years, 8 months

Introducing myself... and my little network

by mcguire＠neurotica.com

On 06/08/2012 03:09 AM, Johnny Billquist wrote: The most common problem with the TK50 is that the tape pickup gets off the holding arm. Easy to fix if you are comfortable with a screw driver. I've had one or two TK50 go bad in other ways, but in my experience it's pretty uncommon for them to really break. It's almost always that pickup. Let me know if you need help understanding that. The "tongue"? Been fixing that problem for years. At one point I ordered a box of (I think) ten of those while DEC was still selling them as repair parts, but they're all gone now. Eventually the little grabber end breaks off due to plastic fatigue. The drives whose tongues are intact simply refuse to read and cause device timeouts. I have at least 7 or 8 in that condition, with no obvious mechanical flaws. I haven't dug into them very deeply. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

13 years, 8 months

Introducing myself... and my little network

by bqt＠softjar.se

On 2012-06-08 09:04, Dave McGuire wrote: On 06/08/2012 07:48 AM, Peter Lothberg wrote: I will set it aside if I find it, and make sure to image it. Image all your TK50's with distribution stuff on drop Al K a copy. I definitely will, if I can keep a drive working long enough. I have probably fifteen TK50 drives here...most of which are dead. Although it was the forerunner of the rather marvelous DLT, the first generation really was a crappy design. :-( The most common problem with the TK50 is that the tape pickup gets off the holding arm. Easy to fix if you are comfortable with a screw driver. I've had one or two TK50 go bad in other ways, but in my experience it's pretty uncommon for them to really break. It's almost always that pickup. Let me know if you need help understanding that. Johnny

13 years, 8 months

Reaching SOL::, was Re: [HECnet] Multinet Tunnel Connections to SG1::

by mcguire＠neurotica.com

On 06/08/2012 07:14 AM, Peter Lothberg wrote: Can you talk to sol:: I can't seem to get to it from my Linux desktop machine, no, but I can SET HOST to it from my Alpha running VMS. (which I'm reaching from the aforementioned Linux machine!) It seems that off-net DECnet routing isn't happening from the Linux machine..? What's up with this, does anyone know? Is it connetivity (routing), or the fact that the linux implementation only speaks VMSnet? That I do not know. Does the linux box talk to stupi:: No, it times out. :-( -Dave -- Dave McGuire, AK4HZ New Kensington, PA

13 years, 8 months

promiscuous mode, was Re: [HECnet] Multinet Tunnel Connections to SG1::

by mcguire＠neurotica.com

On 06/08/2012 02:00 AM, Johnny Billquist wrote: But reading it through now, I see that there was one implicit assumption in my text which I could have pointed out. If you need to share the device with the system, while using a different MAC address, you need to place the device in promiscuous mode. And such is the case if we talk DECnet, since DECnet requires that you use a specific MAC address which is not the same as the default MAC address of a device. In the case of Linux DECnet, it actually changes the "main" MAC address of the interface, it doesn't add another one. And to make a correction to your text, when not in promiscuous mode, your ethernet controller will filter out packets that do not have your MAC address, and packets that don't have the multicast bit set (possibly you can also get it to filter more specific on multicast ethernet packets, but multicast is a separate story from unicast packets on ethernet controllers anyway). Oh yes, I'm sorry for my omission. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

13 years, 8 months

Introducing myself... and my little network

by mcguire＠neurotica.com

On 06/08/2012 07:48 AM, Peter Lothberg wrote: I will set it aside if I find it, and make sure to image it. Image all your TK50's with distribution stuff on drop Al K a copy. I definitely will, if I can keep a drive working long enough. I have probably fifteen TK50 drives here...most of which are dead. Although it was the forerunner of the rather marvelous DLT, the first generation really was a crappy design. :-( -Dave -- Dave McGuire, AK4HZ New Kensington, PA

13 years, 8 months

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