test-drb

test-drb@ccmp.vtda.org

101090 discussions

by wdonzelli＠gmail.com

Curious - did someone here win that nice IBM 9375 on Ebay? I doubt it was a scrapper - the hammer price is too high. -- Will

16 years, 4 months

HP91xx controllers (was HP-IB disc drive emulation programavailable)

by shoppa＠trailing-edge.com

Chuck writes: > What we no longer have is convenient inexpensive storage for modest > amounts of information, say a megabyte or two? Ideally, such a > medium would be read-mostly or write-once and a handful of them would > buy a cup of coffee at your local watering hole. When I got started in computing, a RK05 pack was circa $200 and a 8" floppy was circa $5. A researcher or student might have had a personal RK05 or two and a box of floppies. Today for the non-inflation-amount of money I get a couple of Terabyte portable drives for $200 and a cheapie USB keychain for $5. And they're used for similar purposes (despite a factor of 5 or more orders of magnuted in byte capacity) as the 30-year old equivalents. I see things really staying the same in price and in usage more than changing. What's really cool, is both the USB keychain and the terabyte portable drive use the same cheap and ubiquitous low-end interface. That is an improvement over 30 years ago (don't take that as a slam against the Unibus, if I wanted to insult the Unibus I would call it "cheap and ubiquitous" 30 years ago!) Tim.

16 years, 4 months

Burroughs B5500 and successors (Was: Happy DEC-20 Day!)

by alanp＠snowmoose.com

> > From: "Jonas Otter" <jonas at otter.se> > The architecture has so-called display registers, each of which pointed > to a stack frame for a lexicographical level in the code, i.e. the > procedure call level. Data is addressed as an address couple consisting > of a display register number and an offset, stored in a so-called > Indirect Reference Word (IRW). Data outside of the stack can be > addressed by means of descriptors. Data in another program's stack is > addressed by means of Stuffed Indirect Reference Words (SIRW), which > include a stack number and an offset. The operating system keeps track > of individual program stacks by means of a tree of pointers to job > stacks. Also, to keep track of the procedure calling and return linkage, > Mark Stack Control Words (MSCW) are created whenever a procedure is > called. The Display Registers point to the MSCWs. > Yes, that all sounds familiar. Do you recall the sizes? > All this is designed to support block-structured high level languages, in > fact all the operating system software is (was) written in various ALGOL > dialects. > My favorite dialect was NEWP. I particularly liked the UNSAFE directive. I worked for Burroughs from just before the name change to Unisys (summer '86) to spring '89, my first job out of college. I worked on A Series, V Series, B1000, BTOS and DOS stuff while I was there. At school, I used BSD Unix on VAX and DEC-20, so the Burroughs stuff was really different (from stack machines to two-wire direct, poll/select terminals) and fun to play with and learn. alan

16 years, 4 months

for the Gopher nerds in the audience

by spectre＠floodgap.com

A successful build of GopherVR on Mac OS X: http://www.floodgap.com/iv/632 As you can see, this is the famous unfinished "virtual reality" gopher client. And it really works! I just wanted to share the joy. It doesn't do much more than this, and required some unholy hacking to get it this far, but I'm hoping to release source soon. For those who want to play with GopherVR on classic Mac OS now, you can get it from gopher://gopher.floodgap.com/1/gopher/clients/mac/ -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- If it's tourist season, why can't we shoot them? -- Justice Gustine --------

16 years, 4 months

Searching for some Systems Analysis Documents

by spedraja＠ono.com

Hello. I am searching for these documents or books related with Systems Analysis: * Study Organization Plan, IBM, (Form C20-8075), 1961 * Time Automated Grid System, IBM, (Form GY 20-0358), 1971 * A Study Guide for Accurately Defined Systems, NCR, 1968 Regards Sergio

16 years, 4 months

Anyone happen to have one of these chips?

by teoz＠neo.rr.com

DM74LS 244WM Octal tri-state buffers/line drivers/line receivers 20 pin chip, surface mount. I need one for an 8 bit ISA SCSI card so the ROM I installed works. Looking over my junk boards I dont see any I can snag. If you have one let me know.

16 years, 4 months

Burroughs B5500 and successors (Was: Happy DEC-20 Day!)

by jonas＠otter.se

Alan Perry <alanp at snowmoose.com> wrote: > > This also included the Burroughs/Unisys A-series systems that were > made into the early 90s. > > The A-series systems used a 52-bit, tagged word. 1 bit of parity, 3 > bits of tag and 48 bits of data. > > I don't recall how the addressing worked and Al has my papers on the > architecture, so I can't look it up ... The A-series were direct successors to the B5000/6000/7000 series and used the same architecture. Unisys still sells the ClearPath MCP systems, now using Intel processors and running the MCP operating system (under emulation I think). The architecture has so-called display registers, each of which pointed to a stack frame for a lexicographical level in the code, i.e. the procedure call level. Data is addressed as an address couple consisting of a display register number and an offset, stored in a so-called Indirect Reference Word (IRW). Data outside of the stack can be addressed by means of descriptors. Data in another program's stack is addressed by means of Stuffed Indirect Reference Words (SIRW), which include a stack number and an offset. The operating system keeps track of individual program stacks by means of a tree of pointers to job stacks. Also, to keep track of the procedure calling and return linkage, Mark Stack Control Words (MSCW) are created whenever a procedure is called. The Display Registers point to the MSCWs. All this is designed to support block-structured high level languages, in fact all the operating system software is (was) written in various ALGOL dialects. There is quite a lot of information about this on the net. A book which describes it is Computer Systems Organization by Elliott Organick (ACM Monograph Series, 1973. LCN: 72-88334). -Jonas

16 years, 4 months

Opening 20 year old software on it's anniversary

by RBORSUK＠COLOURFULL.COM

So about a month ago I purchased some Wang branded MSDOS software off of eBay. Much to my delight, when it arrived, it was still factory sealed. I showed my wife the date of manufacture on the label and she suggested I wait to open it. I reluctantly agreed to wait. So it's been about a month and today is the day. Please enjoy some pictures of the moment. http://gallery.me.com/irisworld/100109 Rob Rob Borsuk email: rborsuk at colourfull.com Colourfull Creations Web: http://www.colourfull.com

16 years, 4 months

DECmemory

by wdonzelli＠gmail.com

What machine does the DEC 54-21139 SIMM go with? VAXstation or Alpha? I have quite a pile - available cheap! -- Will

16 years, 4 months

Speechless! (ebay madness alert)

by evan＠snarc.net

I sent a question to the seller, asking for clarification about the serial number. This is the (insane) reply that I got: ------------------ evan_k, thank you for asking about this fine microwaved masterpiece of fine art. This was a perfectly working complete unaltered Mac 512k before it was microwaved by the AMIR 9000 One Ton Microwaving Robot, now a first of it's kind. It is now an incredible work of art considered to be priceless and even better than before it was microwaved. The artist also known as your professional microwave operator waited 25 years to microwave this computer. Some things only just get better with age especially when it comes to the world of art. You can be assured that a fine connoisseur of art will acquire this work of art. The artists has sold artworks to collectors which include Dale Djerassi [son of the of Carl Djerassi who invented the birth control pill, Georgia Frontier just to name a couple. He has also been featured internationally in numerous prominent publications that have included HGTV, OPRAH, TLC, People magazine, Mal Sharp's Weird Rooms Book, CNN, Good morning show, 100 Hojdare Sweden, Urdu Magazine, Los Angeles Times and so on. He also was featured at the most prominent modern art museum in Baltimore called the AVAM. You can be sure this art is authentic, original & sign and dated by the artist & guaranteed microwaved.

16 years, 4 months

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb