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101090 discussions

IBM 7074 and then some: "Systems we love" conference

by steve.maresca＠gmail.com

Just wanted to share an excerpted story just sent to me by a colleague, regarding an IBM 7074 supplying data to Java middleware, ultimately feeding a modern webapp stack: http://thenewstack.io/happens-use-java-1960-ibm-mainframe/ This comes from a conference which occurred last month titled "Systems we love" : http://thenewstack.io/systems-we-love/ http://systemswe.love/ Cheers, Steve

8 years, 3 months

Fourth release of the HP 3000 Series III simulator

by jdbryan＠acm.org

The fourth release of the HP 3000 Series III simulator is now available >from the Computer History Simulation Project (SIMH) site: https://github.com/simh/simh This release adds the HP 32234A COBOL II Extended Instruction Set firmware, enabling execution of programs produced by the COBOL II ('74 and '85) compilers. The new SET CPU CIS option enables the firmware. In addition, two new debug tracing options were added. The SET CPU DEBUG=OPND command turns on memory byte operand tracing to show the values supplied, e.g., to the CMPS (Compare String) instruction. The SET CPU DEBUG=EXEC command turns on execution tracing for a specific instruction or instruction family. The full set of new features is listed in the release notes that accompany the simulator source files. In addition, an updated HP 3000 Simulator User's Guide that covers the new commands is provided in Microsoft Word format with the source download and also as a PDF file at: http://alum.mit.edu/www/jdbryan/hp3000_doc.pdf The preconfigured MPE-V/R disc image available here: http://simh.trailing-edge.com/kits/mpe-vr-software-kit.zip ...has been updated to add the COBOL II runtime routines to the system Segmented Library and COBOL example programs to the OPERATOR.SYS account. The startup command files also now enable the COBOL II instruction set. -- Dave Bryan

8 years, 3 months

DECUS TECO for OS/8

by chd＠chdickman.com

I am trying to build the DECUS TECO with VT support for OS/8. TECO came from ibiblio and the assembler listing says it is OS/8 TECO VERSION 7. I am using MACREL-V1B. It all assembles without error, but the linker fails with a NO ROOM message. I can't find any information on what NO ROOM means from the MACREL documentation. This is using SIMH PDP8 with 32k words. I also found MACREL V2 source, but it in in MACREL, but I have not tried to bootstrap it using V1. I was hoping to make source editing just a little bit easier. -chuck

8 years, 3 months

11/34 with drives on ebay

by jnc＠mercury.lcs.mit.edu

> From: Jay West > A fully working 11/34, in a complete period rack (with all side panels > and filler panels), and 4 working RL02's, VT220, a Decwriter ... > $1000 isn't realistic at all. It should definitely be higher than that. I concur. My methodology for _accurately_ valuing something like this is to create as comprhensive a list of sub-items as possible, then value them, and then add it up; something like this: $A Bare H960 $B 2 x H960 side panels $C BA11-K (box and power supply) $D BA11-K slides $E DD11-PK backplane $F PDP-11/34 CPU boards $G MS11-L $H 4 x RL02 drives $I 15 x RL02 packs etc etc. Alas, the listing doesn't say exactly which boards are in the 11/34 (and not even any pictures of the insides). I don't know exactly how much $A, etc are - I have varying levels of experience with these things, but for instance, I know that MS11-L's are much desired, and command high prices. Note that the listing does have a reserve, so their actual asking price is above $5K. Getting that total out of one bidder may be a bit too far; they might have better luck getting it sold if it was a couple of smaller lots. Noel

8 years, 3 months

Looking to read past EOT on DDS/DLT/LTO

by sieler＠allegro.com

Hi, Thanks for the notes/comments/suggestions. Recovery service: not that I've found. Most of the ones I know of have *us* as their HP 3000 experts (i.e., we help them :) ... when I've asked in recent years about handling damaged or overwritten DDS (or newer) tapes, I've always been told 'no'. The "cut out some tape" would definitely not work. At least LTO, probably DLT, have multiple tracks and the tape makes multiple passes from start of tape to end of tape as it writes the entire tape. That means on a 16 track tape, you'd lose part of 16 different sections if you cut out a piece of tape (ignoring the question of whether or not the drive could resynch after such an error :) Eric's reply is closest to home ... that's why I mentioned a 'hacked' drive, hoping someone might know specialists who have one. Chuck mentioned an approach I had mentioned: the power kill during writing approach. I'm hesitant to try that as it will (based on dim memory of doing it 15 years ago on a DDS) lose a small bit of data ... if it works at all. I'm giving up for now. thanks, Stan > From: Eric Smith <spacewar at gmail.com> > > I hope someone can prove me wrong, but I think that short of a major effort > to hack the drive firmware, the data is gone. Modern tape drives are "too > smart" to allow reading past logical EOT, and the tape format is too > complex to allow fooling the firmware by any simple means. > > ------------------------------ > From: "Nico de Jong" <nico at farumdata.dk> > > I've had the same problem some years back, with a DDS-3, IIRC > > I did some research, and the most reasonable outcome was that it was not > possible by normal means, because some algorithm reading synchronisation > data couldnt find out what was happening, so, the backup was ruined..... > > ---- > From: Chuck Guzis <cclist at sydex.com> > > With nothing left to lose, I suppose that one might overwrite the EOT > and then kill power during the write, then attempt to read backward from > the end of the tape. > > ------------------------------ > From: "js at cimmeri.com" <js at cimmeri.com> > > Would it be possible to just physically > cut the 1kb + EOT portion of tape out, > and then attempt to read from > beginning? I suppose this would depend > on how the backup data is formatted on > the tape (using some kind of container > format with error checking, for instance). > > ------------------------------ > From: Jerry Weiss <jsw at ieee.org> > > Have you approached a commercial recovery service for a quote? > A few do tape media. Whether they quote or not may provide a data point about how feasible it may be. ----

8 years, 3 months

Looking to read past EOT on DDS/DLT/LTO

by cruff＠ruffspot.net

For the NCAR Mass Storage System, when we upgraded our tape drives to Sun STK T10000 models, we lost the ability to skip past the EOT mark with standard firmware. We asked Sun to provide a firmware modification that let us issue four or so reads after reaching the EOT mark, and the drive would then continue on until it found good data again. We didn?t need it very often, but it was handy to recover single copy data.

8 years, 3 months

PS2 Model 30 memory

by jwsmail＠jwsss.com

I have a friend who wants to add more memory to a PS2 model 30. They are off in the wilds of Oz and acquired this for a good price and would like to just upgrade it to run some programs they have which do not run on modern faster systems. I know this is a snake pit to deal with, and can get more info if someone can get me some information or point me at references for them to look at. What I'm really interested in doing is seeing if just the memory can be had, and it isn't easy to find Sim modules these days, though I suspect there are metric tons of them rotting in places forgotten and not recycled yet. anyway any info to get started would be useful. i see there are entire systems on epay, and may suggest just buying one of them and cannibalizing them for their memory should the asking price for the individual SIMM parts be ridiculous. i could buy the system, us the system to be sure the memory does something and send them the memories alone for reasonable shipping. It would also net them a backup hard drive which are very scarce in even good times as well. I'm hoping that the memories were common to other systems and not some oddball special IBM part. Old advertisements that show up on google show a number of people making them, but that doesn't mean they can be found now of course. thanks jim

8 years, 3 months

Selling off my collection

by sellam.ismail＠gmail.com

I'm starting the long process of selling off my entire collection. There's a lot to go through. Some more details are here: http://www.vcfed.org/forum/showthread.php?55964-Selling-Off-the-Collection And some photos are here: http://s350.photobucket.com/user/Sellam_Abraham/library/ Keep in mind the machines represented here are the cream of the crop. I have much more stuff in the form of 40 pallets that needs to get sorted through and moved on. I'll be much more inclined to sell off that stuff quickly, but with these I am ready to take my time. That being said, I'll entertain any reasonable offer. I still have a bunch of photos of magazines to post (just scratching the surface). Pallets worth. Probably best to contact me directly if you're interested in something. I have much, much more. Thanks for looking! Sellam

8 years, 3 months

Selling off my collection

by COURYHOUSE＠aol.com

How much is the - -Bell Labs MAC-8 Microprocessor Trainer Kit thanks Ed# In a message dated 1/25/2017 11:01:50 P.M. US Mountain Standard Time, sellam.ismail at gmail.com writes: I'm starting the long process of selling off my entire collection. There's a lot to go through. Some more details are here: http://www.vcfed.org/forum/showthread.php?55964-Selling-Off-the-Collection And some photos are here: http://s350.photobucket.com/user/Sellam_Abraham/library/ Keep in mind the machines represented here are the cream of the crop. I have much more stuff in the form of 40 pallets that needs to get sorted through and moved on. I'll be much more inclined to sell off that stuff quickly, but with these I am ready to take my time. That being said, I'll entertain any reasonable offer. I still have a bunch of photos of magazines to post (just scratching the surface). Pallets worth. Probably best to contact me directly if you're interested in something. I have much, much more. Thanks for looking! Sellam

8 years, 3 months

8085 Address Decoding

by witchy＠binarydinosaurs.co.uk

Evening folks, Could a stuck bit or floating pin cause this address sequence? 0.142261562500000,'3896' (0x0F38) 0000111100111001 0.142262937500000,'3897' (0x0F39) 0000111100111010 0.142264250000000,'3898' (0x0F3A) 0000111100111011 0.142265562500000,'3899' (0x0F3B) 0000111100111100 0.142266937500000,'3900' (0x0F3C) 0000111100111101 0.142268250000000,'3901' (0x0F3D) 0000111100111110 0.142269562500000,'3902' (0x0F3E) 0000111100111111 0.142270937500000,'61618' (0xF0B2) 1111000010110010 (should be 0x0FB2?) 0.142271937500000,'61619' (0xF0B3) 1111000010110011 (should be 0x0FB3?) 0.142261562500000,'3896' (0x0F38) 0000111100111001 0.142262937500000,'3897' (0x0F39) 0000111100111010 0.142264250000000,'3898' (0x0F3A) 0000111100111011 0.142265562500000,'3899' (0x0F3B) 0000111100111100 0.142266937500000,'3900' (0x0F3C) 0000111100111101 0.142268250000000,'3901' (0x0F3D) 0000111100111110 0.142269562500000,'3902' (0x0F3E) 0000111100111111 0.142270937500000,'61618' (0xF0B2) 1111000010110010 0.142271937500000,'61619' (0xF0B3) 1111000010110011 0.142261562500000,'3896' (0x0F38) 0000111100111001 0.142262937500000,'3897' (0x0F39) 0000111100111010 0.142264250000000,'3898' (0x0F3A) 0000111100111011 0.142265562500000,'3899' (0x0F3B) 0000111100111100 0.142266937500000,'3900' (0x0F3C) 0000111100111101 0.142268250000000,'3901' (0x0F3D) 0000111100111110 0.142269562500000,'3902' (0x0F3E) 0000111100111111 0.142270937500000,'61618' (0xF0B2) 1111000010110010 0.142271937500000,'61619' (0xF0B3) 1111000010110011 My Executel ROM disassembly puts this block of code between 0x0F38 and 0x0F3E: 0F38 L0F38: 0F38 : 7B "{" [4] mov a,e 0F39 : 95 " " [4] sub l 0F3A : 5F "_" [4] mov e,a 0F3B : 7A "z" [4] mov a,d 0F3C : 9C " " [4] sbb h 0F3D : 57 "W" [4] mov d,a 0F3E : C9 " " [10] ret Does that make sense? I might not have a full disassembly since L0F38 is only called from two places and neither of them jump back to 0x0FB2 but I know that doesn't necessarily mean it's wrong. Cheers, -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?

8 years, 3 months

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