- vcf-midatlantic - lists.vcfed.org

SX GBIC fiber cable speed
by Neil Cherry 17 Feb '21

17 Feb '21

I've posted this in the CDL list also. I don't know of a polite way to post once to both and I'm not sure it's a good idea to try. :-) It has been a while since I played with fiber (2010) and I'm trying to figure out if I should go fiber or copper in my home. Here's what I know from my current switch: - SX GBIC - LC - duplex - MMF I want to buy about 25M of fiber. I think the price is competitive with copper. I'm also hoping that the fiber will age better than the copper. I'm seeing a few old copper drops fail to lower settings. One went to 10/half (wow, that's bad). The GBIC & switch I have handle 1G. So I can easily pop in a few 1000baseT, put them into a LAG and get 4G (4 ports). So I'm covered for a while. - Can the same piece of fiber handle 1G or 10G? (in case I upgrade in the future). - Does anyone know the bend radius of this fiber? - What color should I expect for SX fiber. ? - What's a "mode-conditioning patch cord" ? I'm seeing a $35 price for 25 Meter OM3 LC LC Fiber Patch Cable (Corning 50/125um core/cladding) and it says 1G but with a "mode-conditioning patch cord" (an attenuator?). Any pointers? -- Linux Home Automation Neil Cherry ncherry(a)linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies

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Re: [vcf-midatlantic] SX GBIC fiber cable speed
by Neil Cherry 16 Feb '21

16 Feb '21

On 2/16/21 11:08 AM, MikeWillegal via vcf-midatlantic wrote: > Just too many strange incompatibilities with optical SFPs and various vendors equipment when you go optical. When I was in the labs in 2011 we used a lot of fiber. The long haul single mode stuff was fun. In order to use it we had to have attenuators so as to not burn out the lasers. Yes, the SFPs was also fun/ We did have a few no-name (weren't really no-name but I can't recall the vendor). With some equipment we'd turn off the check. Other vendors there was no turning off the check (lock in). The good news is that SFPs are now pretty in expensive for the distances I need. So can actually afford to by the vendor specific SFP. On the subject of vintage networking, I started at the end of coax (10Base2 & 10Base5). I still have nightmare about cable splinters. ;-) I also worked with 1BaseT and that crazy FDDI which had a large LC like connector (why did that LC like connector always end up going to a hub with an ST connector? ;-) ). Didn't like fiber then, did love the 10BaseT hubs. A lot easier on my hands! But my eyes can no longer easily build those cables. -- Linux Home Automation Neil Cherry ncherry(a)linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies

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ENIAC Birthday and thanks to Tony Bogan and the UNIVAC Crew
by Adam Michlin 16 Feb '21

16 Feb '21

Hi Everyone, Tony Bogan worked with our UNIVAC people to create an amazing video honoring the 75 anniversary of ENIAC that has been playing very well on all our social media but has been particularly successful on Twitter with 22,000+ impressions and 3,500+ views only 24 hours after posting. If you haven't seen it, you can view it here: https://twitter.com/vcfederation/status/1361329841275084802 Please retweet! -Adam --- Adam Michlin Director of Marketing Vintage Computer Federation http://vcfed.org https://www.instagram.com/vcfederation https://twitter.com/vcfederation https://www.facebook.com/vcfederation https://www.youtube.com/channel/UCKdBVD2wVUkuJQZhxGvVr0Q

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Paper tape fun
by Crawford Griffith 16 Feb '21

16 Feb '21

Folks, David Gesswein wrote: Things that visibly do stuff are fun. The DEC fanfold is nice the way it mostly restacks. I love watching fanfold run, whether punching or reading. In college, we used to have small ‘SysOps wars’ amongst us nerds on the PDP-11 system. (We were good sportspeople, it had to be recoverable). I took one guy’s entire RSTS/E account, PIP’ed it to the fanfold tape punch, flipped the tape and read it in backwards. Every single file was now byte-reversed, e.g. a BASIC program would start with: “DNE 0009”. He could never figure out how I did it until I told him. I even told him I used ROM. -Crawford

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Paper tape
by Mike Loewen 16 Feb '21

16 Feb '21

Recently, I've been deep into paper tape territory. I exhumed my HP 2748B high speed paper tape reader, and got it running after a clutch plate adjustment. It's connected to my HP 2108A minicomputer, along with a 2645A terminal. I can punch tapes from a Linux system to a GNT-4601 paper tape reader/punch, connected via serial port. Then load the tape into the 2748B and read it into the 2108A. They're not kidding when they say "high speed". http://q7.neurotica.com/Oldtech/HP/2748B/ So, I'm able to load diagnostic tapes from a very large paper tape library on Bitsavers. Some of the diags only require front panel operation, while others need a terminal. There's also paper tape BASIC, which I'll get to after a connector arrives to make a different terminal cable. http://q7.neurotica.com/Oldtech/HP/2108A/HP2108A_2748B_2645.jpg The 2748B reader doesn't have a takeup reel, so naturally the tape goes all over the floor. Rewinding it is a PITA. I saw a picture of a handheld HP tape rewinder, and built my own to chuck into my cordless drill. Rewinds even faster than it spits out! http://q7.neurotica.com/Oldtech/HP/Rewinder.jpg Mike Loewen mloewen(a)cpumagic.scol.pa.us Old Technology http://q7.neurotica.com/Oldtech/

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Apple IIe Related Kickstarter
by Herb Johnson 15 Feb '21

15 Feb '21

> a new, transparent keyboard for the Apple IIe. soda !-> keyboard - Herb -- Herbert R. Johnson, New Jersey in the USA http://www.retrotechnology.com OR .net preserve, recover, restore 1970's computing email: hjohnson AT retrotechnology DOT com or try later herbjohnson AT comcast DOT net

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Apple IIe Related Kickstarter
by Chris Fala 15 Feb '21

15 Feb '21

In case you missed it, a new, transparent keyboard for the Apple IIe. https://www.kickstarter.com/projects/maceffects/mechanical-keyboard-for-the…

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HP 85 For Sale (not mine)
by Alexander Jacocks 14 Feb '21

14 Feb '21

All, There is an HP 85 for sale, near me, if anyone is interested: https://www.facebook.com/marketplace/item/313453723100742/ - Alex

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Anyone Have a B/C Class HP 9000 Workstation for Loan/Trade/Sale?
by Alexander Jacocks 13 Feb '21

13 Feb '21

All, I need some kind of an HP PA workstation for a project that I have coming, next month. Does anyone have one that they'd be willing to part with, either temporarily, or permanently? I'm in Maryland, in the USA. Alternatively, does anyone know what PCI video cards might be supported in HP A-class servers? That might be an option. Thanks! - Alex

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Infoage closed tomorrow Sunday February 14
by Jeffrey Brace 13 Feb '21

13 Feb '21

Due to the impending ice storm, All Infoage museums will be closed tomorrow Sunday February 14. Jeff Brace ========================================= Vice President & Board Member Vintage Computer Festival East Show-runner Vintage Computer Federation is a 501c3 charity http://www.vcfed.org/ jeffrey(a)vcfed.org

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