test-drb May 2005

test-drb@ccmp.vtda.org

248 participants
723 discussions

by pete＠dunnington.u-net.com

On May 22 2005, 20:49, Jay West wrote: > Jim wrote.... > > Location Content Op-code comment > > 001000 012700 mov #1,r0 load ro with 1 > > 001002 000001 > > 001004 006100 rol rotate r1 left > > 001006 012701 mov delay r1 load register r1 with delay > > 001010 007777 delay > > 001012 005301 dec r1 decrement register 1 > > 001014 001376 bne -2 continue to decrement r1 until > > r1=0 > > 001016 000772 br -12 back to 001002 (dec r0) > > This runs on my /45, but produces a steady light display, not a cylon or > "blinking" effect. I'm not much of a Unibus expert but I seem to remember there's something odd about what's displayed in the lights, and how you get it to change. > It's been decades since I looked at '11 assembler. I'm > confused about something in the listing above. If the 012700 at location > 1000 is a load r0 with 1, I'm guessing the next word (1002) is the constant > to be loaded? So, why would the branch at location 1016 go back to the data > at 1002? Obviously there's something I'm missing. The code is correct, the comments are correct, but the mnemonic instructions are wrong :-) Remember that what's counted in a BR instruction are words, not bytes, but that when the instruction is interpreted, the PC has already been incremented. So 777 is a "branch to self", and 776 is "branch back to the previous instruction". 1376 is "branch back to the previous instruction if Z is set", as at 1014. 772 does indeed branch back to the ROL instruction, because it's "branch back 6". Looks like Jim remembered that "branch back to the previous" is "br -2", thought "two bytes", and just doubled the six to twelve -- except that what he wrote was octal 12 (there's no decimal point after it), or ten decimal :-) Actually, if I'm being really picky, it should be "br .-2". -- Pete Peter Turnbull Network Manager University of York

19 years, 7 months

Anyone know this guy!?

by leeedavison＠yahoo.co.uk

> And if so, can you explain what he's smoking? Errr, no. Going by the numbers from the two pages he's been shifting 25,000 peices each year with 7 tears of stock left. I also see it's an auction with a starting price of $199k but no reserve?! How does that work? Surely the starting price IS the reserve because I sure as heck can't bid $1 and have it accepted. Lee. . ___________________________________________________________ Yahoo! Messenger - NEW crystal clear PC to PC calling worldwide with voicemail http://uk.messenger.yahoo.com

19 years, 7 months

Better indexing on bitsavers

by julesrichardsonuk＠yahoo.co.uk

On Fri, 2005-05-20 at 09:55 -0700, vrs wrote: > > It's *could* - problem I've always found is that tools to handle multi- > > image TIFF files are pretty thin on the ground; they either don't bother > > at all (and assume one image per file) or they try and buffer the whole > > lot into memory (for 100 A4 page scans in one file, that's Not A Good > > Thing). Only about 20% of tools I've come across over the years actually > > try and handle TIFFs properly (as I've said in the past, even > > Imagemagick isn't great because it buffers data to 32-bit colourspace in > > memory regardless of the actual images' bit depth) > > The spectacular badness of TIFF viewers (at least at the free-as-in-beer > level) is why I prefer PDFs. Despite their problems, the PDF viewers seem > *way* better at rendering (and printing) the pages. (Though I am sure there > are other platforms which have no decent PDF viewer.) Acrobat seems to be the only one under Linux that works well with PDFs full of image scans, but the fact that Adobe have bloated it out to nearly 100MB for the viewer has annoyed me somewhat. Ghostscript doesn't seem to render with particularly good quality, and all the other viewers I've tried seem rather incapable of dealing with the physical size of PDF files that are wrapping document scans (I assume it's another one of those situations where they're trying to buffer the whole damn file into memory at once) Presumably other Unix platforms suffer the same problems as they're largely reliant on the same tools. How Adobe mange to make Acrobat eat up 100MB of space is beyond me though... :-( I can't say I've found many bad TIFF viewers for single images though (on any platform); it's only when multiple images are put into the same file that a lot of tools start falling over. cheers Jules

19 years, 7 months

SGIs and 64-bittiness

by Saquinn624＠aol.com

IP26&28 Indigo2s, all Onyxes, Origins and big Challenges are also full 64-bit. But, that doesn't really mean much practically speaking- almost everything is compiled in n32 "hybrid" mode, which will run on any R4k or better with IRIX 6.2+. In fact, n32 is what SGI recommends becasue it's faster in processing and, I believe, slightly more memory efficient.

19 years, 7 months

Oops ! Please ignore my reply just now -- RE: Also ... RE: Anyone know this guy!?

by news＠computercollector.com

Meant to send that "maybe he's donate" message to my local club. Sorry. -----Original Message----- From: Evan [mailto:evan947 at yahoo.com] Sent: Tuesday, May 24, 2005 12:16 AM To: 'General Discussion: On-Topic and Off-Topic Posts' Subject: Also ... RE: Anyone know this guy!? Maybe he'd consider donating parts of the collection to MARCH. -----Original Message----- From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Computer Collector Newsletter Sent: Tuesday, May 24, 2005 12:08 AM To: 'General Discussion: On-Topic and Off-Topic Posts' Subject: Anyone know this guy!? And if so, can you explain what he's smoking? http://www.clelsplace.com/eli/ The press release attached to this link is dated May 21, 2005. Oddly, it appears he did the same thing in 2002: http://yahoo.pcworld.com/yahoo/article/0,aid,104772,00.asp ----------------------------------------- Evan Koblentz's personal homepage: http://www.snarc.net Also see http://groups.yahoo.com/group/midatlanticretro/ *** Tell your friends about the (free!) Computer Collector Newsletter - 725 readers and no spam / Publishes every Monday / Write for us! - Mainframes to videogames, hardware and software, we cover it all - W: http://news.computercollector.com E: news at computercollector.com

19 years, 7 months

EAI Analog Computers

by aw288＠osfn.org

I have a pair of EAI TR-48 analog computers that I really need to part with. These are circa 1960 machines. From Mr. Cowards site: Operating range: +/- 10 volts DC Computing Elements: Up to 58 DC amplifiers Up to 115 Coefficient setting potentimeters Options: Up to 24 integrators These are large machines, so if you are located far away from Carmel, NY, you would need to call a mover (I could deliver withing a few hundred miles with some arm twisting). One machine has the original operating desk, plus there are a few extra patchpanels, lotsa cords, modules, and other good stuff. Any interest on this list? If so, I should start digging these out of storage. These are for sale, but I would consider trades of old mainframe or minicomputer stuff. William Donzelli aw288 at osfn.org

19 years, 7 months

IBM PC, XT, Tandy 1000, TRS-80 available in NJ

by cb＠mythtech.net

Ok, time to reduce inventory again and get rid of more stuff that I haven't gotten around to playing with. I've got a few IBM PCs (5150), IBM XTs (5160), a Tandy 1000, and a TRS-80 (model 3? The silver all in one unit) All are available free for pickup in Northern NJ (Ridgewood, 07450). Right now I'm not willing to ship (well, I am, but you better offer me something to make it worth my time/effort, if I had the interest in shipping, I'd try them all on ebay first) All are also free if you pick them up. I'm not in any huge rush to get rid of them, but the sooner the better (ie: they are in no danger of being thrown out and I am willing to hold for a reputable person that I honestly believe will actually show up to get them... don't do what I did to poor Dave in CT and take well over a year to drop off a tape deck I owed him). I only have one TRS-80, it does not have any floppy drives, software, or anything else. I only have one Tandy 1000, but it has the keyboard, monitor, and printer (humm... actually, it may not have the keyboard, I'd have to double check). No software or anything else. I have a few IBM PCs and IBM XTs, I'm not 100% positive on the counts on either. I may or may not have monitors to go with them, but I should have keyboards (I should also have at least two monitors, plus I believe a broken mono for the PC that I never got around to doing the repair Tony explained to me). I don't currently have any software or otherwise for them, although I believe some have hard drives, and I have no idea what may or may not be on those. None of the above are tested right now, but if someone is honestly interested in picking anything up, I'm willing to do any testing I can before you take the time to drive and get them. I'm also willing to drive within reason to deliver them, but I'd like something in return if I do (I prefer something cool in trade, I like things made by Apple, but I'm also in desperate need of some kind of tablet computer or similar I can use as a basic eBook reader, I may also be interested in other items) -chris <http://www.mythtech.net>

19 years, 7 months

Classic DEC picture from "American Used Computer"

by shoppa_classiccmp＠trailing-edge.com

In the 60's and 70's, there was an outfit called "American Used Computer" in Mass. Based on what I've seen, they took reject PDP-8's, -9's, -10's, -11's, Novas, etc., from dumpsters and tried to reconfigure them into saleable (maybe not workable!) systems. (Sort of the same way Poly Paks took cast-offs parts from the same companies and sold them.) Anyway, a truly classic picture of dozens of H960 racks filled with stuff and the proprietor is online if you go to http://www.nixiebunny.com/ and click on the picture at the "American Used Computer" link. By the time I was into this stuff, the outfit was long out of business, but my colleagues told legends about the mismatched boards they put together and tried to sell as complete working systems :-). Tim.

19 years, 7 months

cc65 for AIM 6, paper tape format text files?

by andyda＠mac.com

Hi Thanks again for all the help and encouragement my AIM65 lives. The last H/W problem was serial comm between my Mac and the AIM 65. Mike Stein devoted quite a bit of time and email helping me to get it working. Now I can transfer data between the AIM 65 and the Mac. Now all I need is a way to convert cc65 object files into Mos Technology Paper Tape Format text files so I can transfer programs assembled/compiled on the Mac to the AIM and use the Mac to store data from the AIM in paper tape format text files. I have been asking around but I can't find anyone who has written a converter to convert from cc65 object file format to paper tape format text files. Anybody here ever done such or have any info which might help me do it myself? Any help much appreciated, Andy

19 years, 7 months

Selling medium old software

by cb＠mythtech.net

>On a similar note, sometime in the mid-90's some guy bought out >millions of remaining Atari 2600/5200 cartridges, and started selling >them on his website. I cannot imagine him selling them all! >Although I could see how he might get tired or bored of the same >old thing... > Is that the guy that was housing them in an old salt mine? -chris <http://www.mythtech.net>

19 years, 7 months

← Newer
1
...
15
16
17
18
19
20
21
...
73
Older →

Jump to page:

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 May 2005