test-drb December 2009

test-drb@ccmp.vtda.org

184 participants
226 discussions

Data General software agreement pre-announcement (Merry Christmas)

by shoppa＠trailing-edge.com

Bruce, My contribution, tapes I recovered and imaged in the mid-90's: http://www.trailing-edge.com/~shoppa/dg1.zip http://www.trailing-edge.com/~shoppa/dg2.zip Good luck with the big project! Tim.

14 years, 4 months

CNC/NC

by roger.holmes＠microspot.co.uk

> From: "Rick Bensene" <rickb at bensene.com> > > Earlier controls had RS-232 ports. I wrote a system on a PC running > FreeBSD Linux using Perl (a very early version) that would send and > receive programs to all of the controls in the shop over RS-232. I used > a SCSI terminal server box from Central Data that hooked up to the PC > over a SCSI channel, and provided 16 RS-232 serial ports that went out > to all of the machines. Amazingly enough, this thing is still in > service (in a shop environment) after over 15 years, providing an easy > way to load programs on some of the older controls. I wrote a similar program in 1979 to do a similar job with an Apple ][ europlus (to a Bridgeport Series 1). It was written in my own high level assembler (for the 6502) and worked with only one machine at a time and included Apple's word processor integrated in (by disassembly, converting to high level and inclusion in the source with suitable links) and we sold a normal version with it with permission from Apple.We also had a program which emulated a vertical mill and drew the programmed path on screen or on a pen plotter. I know they were in use about 20 years later but probably all dead by now. We also did a version which allowed operators to program a Heidenheim 131 or 145(?) controller on the Apple 2 without tying up the real machine which cost about 30 times as much as an Apple 2.

14 years, 4 months

DECmemory

by shoppa＠trailing-edge.com

Will writes: > What machine does the DEC 54-21139 SIMM go with? VAXstation or Alpha? > I have quite a pile - available cheap! It goes in at least some of the DEC 3000 Alphastations. Which themselves could use commodity PC-clone memory with parity (at least for the 8MB SIMM's, there's some special sensing resistor in the DEC 32MB SIMM's) so they would probably work in anything needing 8MB Parity SIMMs. Geeze, I haven't thought about DEC 3000 memory in a decade. IIRC the Alphastations shipped with 8MB SIMM's and these often were pulled and replaced with 32MB SIMM's. Tim.

14 years, 4 months

DDC BUS-65517 1553 card

by arlin＠gdca.com

Do you have any BUS-65517 cards. I have a system that I need some spares on. Arlin 925-784-4642

14 years, 4 months

IBM 9375

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

14 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.

14 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

14 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 --------

14 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

14 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.

14 years, 4 months

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test-drb December 2009