test-drb

test-drb@ccmp.vtda.org

101090 discussions

by ard.p850ug1＠gmail.com

I am not sure if anyone is interested, but I've scanned the manual for the Trend HSR500 and HSR500P optical paper tape readers. If I've got the permissions right, then you can get it from my google drive on : https://drive.google.com/open?id=0B5uNCTLB4VsqRU9TWDIzWnZYaU0 It's a large file, I don't think the scanner software has heard of compression!. If anyone can make it a more reasonable size, feel free... This is a proper manual with schematics, parts lists, adjustment info, etc. I've also scanned the circuit diagrams for the Trend Paper Tape Station, here https://drive.google.com/open?id=0B5uNCTLB4VsqemRFMnVNb0l5WU0 The Paper Tape Station is a rack unit containing an HSR500 reader, power supply, GNT34 punch and a driver card for the punch. Those diagrams are for the punch driver and power supply, you need the HSR500 manual as well. Let me know if it all works... -tony

8 years, 9 months

8085 RAM testing program

by witchy＠binarydinosaurs.co.uk

Hi folks, I'm at the point of troubleshooting this 8085 board where I need to test all the RAM. The code loops at an IN looking for....something. Based on other assembly programs I've looked at the code is very similar to eg a disk controller looking for a READY signal from a drive. Trouble is I have no idea what's expected to be at I/O port 0xE3. If it was one of the peripheral chips I'd expect a chip select line to go low. The 74LS139 that does chip select is OK - I've tested it off-board and all traces going to it buzz out OK. The code uses upper RAM as a scratch pad so what I'd like to do is replace the $0000 ROM with an EPROM containing RAM test code. I've found incomplete examples that need to be tailored so before I go reinventing the wheel has anyone got a working example I can use? Warnings of things I should and shouldn't do? RAM is at $8000-$FFFF, and at least some of it is ok since the stack pointer is up at 0xF0B3 and I can trace the code by watching which addresses it's reading. Cheers! -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?

8 years, 9 months

Information Request: unidentified HP 9825T instructions

by cruff＠ruffspot.net

I am working on the disassembly and commenting of the 98228A disk ROM for the 9825T, and my disassembler flagged two instructions as invalid. They are used inside a routine that copies blocks of words from various banks of the ROM into low RAM. The first, bit pattern 070113, is used immediately after a dir (disable interrupt) instruction. The second, bit pattern 070117, is used immediately before an eir (enable interrupt) instruction. The ?invalid? instructions do not match any instructions described in the 9825A patent, nor are present in the 9835 or 9845 assemblers instruction descriptions. From the surrounding code, it doesn?t appear that these instructions reference any of the user visible CPU registers, but are used in some way that enhances the effect of dir/eir and ensures the block copy is not interfered with. Anyone have any ideas? Possibly a DMA request ignore/resume pair?

8 years, 9 months

Disassembly of a DG One?

by isking＠uw.edu

Hey all, Is anyone out there familiar with disassembly of the Data General DG One portable? I have one of the EL models - it looks so cool! - and the hard drive is stuck. I want pull it out and repair it, but I've reached an impasse. I have the machine disassembled and the HD case is accessible, but there is no obvious way to remove it. I don't like to just force things, for obvious reasons. Thanks to anyone with some advice. -- Ian -- Ian S. King, MSIS, MSCS, Ph.D. Candidate The Information School <http://ischool.uw.edu> Dissertation: "Why the Conversation Mattered: Constructing a Sociotechnical Narrative Through a Design Lens Archivist, Voices From the Rwanda Tribunal <http://tribunalvoices.org> Value Sensitive Design Research Lab <http://vsdesign.org> University of Washington There is an old Vulcan saying: "Only Nixon could go to China."

8 years, 9 months

tu58fs - oversized TU58 tapes under XXDP and RT-11

by j_hoppe＠t-online.de

Friends, tu58fs 1.1 now supports oversized TU58 tape images, with capacity up to 32MB instead of 256KB. This was easy to made for XXDP. Under RT-11 the DD.SYS driver must be patched and reinstalled, tu58fs now handles this automatically. The GITHUB release at https://github.com/j-hoppe/tu58fs/releases contains 2 new demos: "demo_xxdp_oversize" packs the whole XXDP25 RL02 disk content onto an emulated tu58 "demo_rt11_oversize" boots a full RT-11 installation from TU58, and mounts a 2nd tape full of games. Docs at http://retrocmp.com/tools/tu58fs were updated. And I feel pretty empty now ... hope you love it! Joerg

8 years, 9 months

LMI Lambda?

by dseagrav＠lunar-tokyo.net

If there is anyone out there who has access to or knows someone who has access to an LMI Lambda in any condition or configuration, please contact me.

8 years, 9 months

16MB memory module for a PC110

by brain＠jbrain.com

I know it's a "newer" PC compatible machine, but I was wondering if anyone had a 20MB PC110 Palmtop and could tell me (or send me pics) of the 16MB RAM upgrade. I have a non working unit here I can liberate the 4MB module from, and I believe I can replace the RAM ICs with larger ones. The DRAMs on the board are HM51W16160ATT7, which are 70nS FP DRAM 1Mbx16 I assume there are similar 4Mbx16 DRAMs I could solder in (A0-A11 Row/Col) Jim -- Jim Brain brain at jbrain.com www.jbrain.com

8 years, 9 months

SunOS 3.5 and SMD disks

by dennis.grevenstein＠gmail.com

Hi, I recently acquired an old Sun3 with a Fujitsu Eagle disk. This disk has SunOS 3.5 on it. Parts of the installation were missing, though. I wanted to build a new kernel with SCSI support and extracted the sys stuff >from a 3.5EXPORT release tape. My machine however runs plain 3.5. I can build a new kernel, but some things won?t worked like allowing logins when a password is set. Is there anyone out there who could provide me with a tar of /usr/sys >from a complete working SunOS 3.5 running on sun3? As a second question: The SunOS boot disk is a Fujitsu Eagle that often reports errors. I have a second Eagle that I might use as a backup, but I would have to reformat the second disks. How can I do that with SunOS 3.5? There is no ?format? command apparently. thanks, Dennis -- Don't suffer from insanity... Enjoy every minute of it.

8 years, 9 months

RSTS V7 magtape images on bitsavers

by jnc＠mercury.lcs.mit.edu

> From: Paul Koning >> When did V7 come out, BTW? > The files on the SYSGEN tape have a timestamp of 26-Sep-79, so "Fall > 1979" sounds right. Ow. I was looking for something a lot earlier than that. I used RSTS-11 in the '72-'74 timeframe, so it's a version from that era I'd like to have. Any idea what version that would be - and if it's still extant? > I've used the V4A kit (DECtapes) to build that ... (There's a V4A > sysgen manual on Bitsavers too ...) When was that one? >> It would be really nice to have sources - are they gone forever? > Some still exist. I know someone who has a RSTS source kit, not sure > which version. I have pieces of source. OK, better than nothing. > A complication with all of this is the question of licensing. There's a > hobbyist license for RSTS to build and run it, but whether that carries > over to making sources available is an interesting question. I'm not > sure who to ask these days, either. Hmm. I guess technically HP owns it now? Noel

8 years, 9 months

LMI Lambda?

by john.h.blake＠gmail.com

> > > Apple is slightly different -- the licence for Mac OS X stipulates > > > that you're only allowed to run it on Apple-branded hardware. This is > > > somewhere between rare and unique, though, and it has recently been > > > relaxed slightly to permit use of hypervisors. > > > > EULAs have the same value as toilet paper and should be used for the same > > purpose. > > > > Legally, they can and have been enforced. So their value is not nil > > when it comes to screwing up someone. I was always under the impression that EULAs existed, at this point, solely to scare corporate/commercial users into license compliance in order to avoid lengthy and draining court expenses, since they've been shown to be entirely unenforceable on individuals since the 90s. That's why Adobe stopped trying to prevent piracy of Photoshop on a single-user basis long ago, as an example. License compliance is irrelevant for individual users and particularly so for long obsolete software, i.e. anything that might reasonably be emulated. Even emulating a more recent video game system such as the Wii would be impossible to prevent given that the courts have decided that it is acceptable to create backups of software that you own and the original creator cannot prevent you from using that backup on a different platform than originally intended (recent example being ripping a CD you own and listening to it on an mp3 player, or more distant example, creating mixtapes for your personal use). Not that it would prevent you from having to deal with a court case, but in virtually every case I'm aware of over the last decade or so it's usually just been a cease and desist letter to show the company still intends to maintain copyright, but actually taking someone to court for emulation would be catastrophic for any corporation's public image and virtually guaranteed to be thrown out.

8 years, 9 months

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