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101090 discussions

Semi-OT -- IEEE 802 Committee anniversary

by evan＠snarc.net

I don't normally like to mix work with pleasure, but (selfish plug) here is an article I wrote today: http://tinyurl.com/ykpd6bn It's about the history of the IEEE LAN/MAN Standards Committe -- from which we all got standardized Ethernet, WiFi, Bluetooth, etc*. *< no shame > Slashdotting strongly encouraged. < / no shame >* *

16 years, 1 month

DECwriters

by tsw-cc＠johana.com

Ethan Dicks <ethan.dicks at gmail.com> wrote: >On Tue, Mar 9, 2010 at 4:01 PM, Dave McGuire mcguire at neurotica.com> wrote: >> On Mar 9, 2010, at 3:20 PM, William Donzelli wrote: >>> Curious... >>> >>> Who here has a DECwriter I (LA30)? This is the original early 70s >>> DECwriter made out of Flip Chips. Google for a picture. >> >> ?Not me. :-( >> >>> Who here would like a DECwriter I? >>> >>> No, I am not selling, just curious... >> >> ?Oh, I'd definitely drool over such a device. ?I've typed on no end of LA34s, LA36s, and LA120s, but never an LA30. >Agreed - I have run miles of paper through the common models of teleprinters, but have never seen an LA30 up close. >-ethan I bunch of years ago, I got an LA30 decwriter that was about to be "discarded". I got the prints as well, and I added lower case to it. I used the ADM-3A method of making the lower case characters up one dot to allow for "decenders" (the LA30 uses a 5x7 matrix). I took out the 2513 character generator, and re-wired it for a 2716 EPROM. It is in my "other" garage and works OK. Plugs into dataphone and all that. I was lucky that there was an extra pin on the character generator board (or I used the negative supply I don't remember right now). The real modification I would like to do is add a FIFO chip or some such, as padding each line with a bunch of NUL characters is a pain. I guess that connecting it to my SBC6120 would be a good retro thing. Got to get it (the SBC6120) working!!

16 years, 1 month

Xerox 820-II floppy images added to bitsavers

by richardlynch3＠tx.rr.com

For those with Xerox 820-II systems, Al has kindly posted a file on bitsavers containing images of a large collection of 8" floppies primarily for the 820-II (there are a few for other systems too) that I acquired a few years ago and just finished archiving this week. There is also an excel file with details on each floppy. These came from someone who worked as a software developer in the late 70s/early 80s and many appear to contain source code. Richard

16 years, 1 month

Solid State Disk replacement for RD53, 54, RK05, RL02/02

by bob＠jfcl.com

>which anyone could then program to emulate any disk/controller they like. Ah, well, this is the hard part of the job, right? Building the board is the easy part. I'd buy a couple, at least, without exaggeration, if the Verilog or VHDL to make them functional already existed. Bob Armstrong

16 years, 1 month

Old books, mostly UNIX books

by segin2005＠gmail.com

I've got a number of old UNIX books that I need to get rid of soon. Books I have: The Waite Group's UNIX? Primer Plus (Sams Publishing) ISBN 0-672-22729-0 Introduction To UNIX? (QUE Publishing) ISBN 0-88022-745-1 QuickBASIC Programmer's Toolkit (QUE Publishing) ISBN 0-88022-450-9 UNIX? Programmer's Reference (QUE Publishing) ISBN 0-88022-536-X UNIX? Networking (Hayden Books) ISBN 0-672-48440-4 Exploring the UNIX? System, Second Edition (Hayden Books) ISBN 0-672-48447-1 EXAM CRAM TCP/IP for MCSE (Certification Insider Press) ISBN 1-57610-476-1 All ISBN codes reported exactly as they appear on the physical books themselves. Abnormal or non-compliant hyphenation is therefore the fault of the publisher. "QuickBASIC Programmer's Toolkit" includes a 5.25" floppy disk. The disk is in near-perfect condition (visually), with the only noticeable issue is that the disk label has lost it's adhesiveness. Unknown whether it is 360K or 1.2M. Whoever takes this book, I request that you image this disk for me. Something mountable using a loopback device, please, no DOS Teledisk format or whatever. Please reply either on or off list. Shipping location is Gibsonton, Florida, United States of America. Zip/Postal is 33534. I have to get rid of these by Saturday. I don't want to have to garbage them if someone will take them.

16 years, 1 month

Solid State Disk replacement for RD53, 54, RK05, RL02/02

by steve＠cosam.org

> There was a thread recently on the comp.sys.dec newsgroup which ended up > with the suggestion from David Riley that he would be prepared to build an > FPGA-based board with a QBUS interface on one side and an SD interface on > the other which anyone could then program to emulate any disk/controller > they like. I should've known I'd miss something like this if I stopped following the newsgroups... I've been working on something similar, which would essentially be an SD and/or ATA-based MSCP adapter. The current design is based on an ARM microcontroller handling MSCP and physical storage and an as yet to be selected PLD of some description for the QBus interface and DMA. It's still in the early stages, but I have a fair bit of it worked out and have started on a prototype. I'm not a bit fan of duplicated effort, so depending on how far David's project is and the common goals, maybe there is room for collaboration or even combination of projects to some degree. > I have been in touch with him to see how much interest he has > had, because he needs a minimum number of about 10 to make it viable, but so > far there has only been me and one other person showing an interest. David > reckons they would come to a little over $200 each (possibly less if there > is more interest). If it does MSCP and all the stuff I want my own project to do (or can be easily programmed to do so) I'd want one - would save me a lot of work ;-) At $200 a pop though, I would be more interested in two or three unpopulated PCBs than a complete unit. Cheers, -- Steve Maddison http://www.cosam.org/

16 years, 1 month

Solid State Disk replacement for RD53, 54, RK05, RL02/02

by mcguire＠neurotica.com

On Mar 10, 2010, at 4:49 PM, Rob Jarratt wrote: > There was a thread recently on the comp.sys.dec newsgroup which > ended up > with the suggestion from David Riley that he would be prepared to > build an > FPGA-based board with a QBUS interface on one side and an SD > interface on > the other which anyone could then program to emulate any disk/ > controller > they like. I have been in touch with him to see how much interest > he has > had, because he needs a minimum number of about 10 to make it > viable, but so > far there has only been me and one other person showing an > interest. David > reckons they would come to a little over $200 each (possibly less > if there > is more interest). David is not yet on cctalk so he agreed to let me > cross-post this to cctalk on his behalf, but I have cc'd him so you > can > reply direct. [raises hand] -- Dave McGuire Port Charlotte, FL

16 years, 1 month

Solid State Disk replacement for RD53, 54, RK05, RL02/02

by robert.jarratt＠ntlworld.com

There was a thread recently on the comp.sys.dec newsgroup which ended up with the suggestion from David Riley that he would be prepared to build an FPGA-based board with a QBUS interface on one side and an SD interface on the other which anyone could then program to emulate any disk/controller they like. I have been in touch with him to see how much interest he has had, because he needs a minimum number of about 10 to make it viable, but so far there has only been me and one other person showing an interest. David reckons they would come to a little over $200 each (possibly less if there is more interest). David is not yet on cctalk so he agreed to let me cross-post this to cctalk on his behalf, but I have cc'd him so you can reply direct. Regards Rob

16 years, 1 month

PDP-11 Color Codes

by tshoppa＠wmata.com

I think the rack headers all faded fairly rapidly and especially on the plastic panels, some yellowing went on as well. I think the actual shade on any given sample could be used by industrial archaeologists to deduce the UV and ozone contents of previous decades :(. I personally don't like faded or yellowed colors so when I want to re-do a paint job, I always choose a hue and shade more vibrant than any of my existing samples. So go pick the most vibrant burgundy and maroon you can find at the paint shop. Tim.

16 years, 1 month

Another Cortesi book online - CP/M Programmer's Notebook

by jack.rubin＠ameritech.net

Dave has added the CP/M Programmer's Notebook to his website? - http://www.tassos-oak.com Links to the Notebook and Dr.Dobbs Z80?Toolbook are at the bottom center of the page. If you aren't familiar?with his work, take a look. Highly recommended! Jack

16 years, 1 month

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