test-drb August 2006

test-drb@ccmp.vtda.org

216 participants
517 discussions

by aek＠bitsavers.org

> he happened to drop that he had a A/UX tape that he could not read as his tape > drive had "gone goo" It turns out to be A/UX 1.1 (!) I really hope he didn't discover this by attempting to read the tape. If so, he now has goo on the tape, and it will be extremely difficult to recover. FWIW, I have an image of A/UX 1.0, made in the days when the only way to get a copy was to go over to Bubb Road with a disc and have the original A/UX group clone it for you.

17 years, 6 months

New to the list

by segin2005＠gmail.com

Hello all. I am new to this list, and while I've posted comments before, that was without formal introduction, so here goes. I am a 16 year old high school student who works with computer daily. I perfer to work with older systems (386s are fun!) because they are just so damned reliable. Mainly, I do software development, but when I have time, I uhh... can't remember. Ahh, what the hell... You can just call me segin. -- The real problem with C++ for kernel modules is: the language just sucks. -- Linus Torvalds

17 years, 6 months

11/34 failing trap test

by pete＠dunnington.plus.com

On Aug 19 2006, 9:38, Wolfe, Julian wrote: > I got the 11/34 up and running, and I loaded XXDP. It fails the trap > test. The instructions state you should examine the stack pointer > (777706) which shows it to be a value of 000470. This is supposed to > tell you the address of the Program Counter, right? So I load address > 470, and the value is 000330. What instruction is failing? Am I > reading this right? Yes, the stack pointer points to the last address used on the stack, and that will be the value of the PC when it called the error subroutine, or to put it another way, the address of the next instruction to be executed had the JSR not been taken. It's failing at whatever test was just before location 330 -- which is surprisingly low. You'd need to look at the listing to see what the test was. -- Pete Peter Turnbull Network Manager University of York

17 years, 7 months

Need microprocessor trainer, oscilloscope advice?

by reevejd＠mchsi.com

Hello All. I'm new to this list and would like some advice on learning the inner workings of vintage computers. I have some basic experience with electronics and some simple measurement tools (multimeter, logic probe). So far, I've repaired a couple of older machines (Kaypro's, Compaq portables) but this has amounted to swapping dead hard or floppy drives, replacing dead batteries, etc. So here are my questions: (1) Is there a "trainer" system good for learning about microcomputer design and operation, and (2) would an oscilloscope be useful for this purpose, and if so, what Mhz rating is needed to work on older machines? I've noticed the price is directly proportional to this number! Thanks, John R.

17 years, 7 months

Help ID-ing DOS backup format

by cclist＠sydex.com

Folks, I received a couple of DC6250 backup tapes this morning. While writing a program to unravel the backup format looks to be pretty simple, I'd like to know what created these beasts. They're from a Windoze box circa 1995. The "GENERATION" right at the start might be a hint. Here's a dump of the first few bytes of a tape, hex on the left, ASCII on the right: 000000 47 45 4E 45 52 41 54 49-4F 4E 20 EC E9 C6 F3 F4 GENERATION 8T?=( 000010 F4 E5 C2 20 20 70 6F 73-5F 62 61 63 6B 75 70 5F (s- pos_backup_ 000020 32 39 30 38 39 35 20 20-20 20 20 20 20 20 20 20 290895 000030 20 20 20 20 20 20 31 30-3A 32 30 3A 30 31 20 33 10:20:01 3 000040 30 2F 30 38 2F 31 39 39-35 20 4E 20 20 20 0A 31 0/08/1995 N ?1 000050 30 20 31 20 20 20 20 20-20 20 20 30 30 30 30 20 0 1 0000 000060 30 30 30 30 20 43 3A 5C-0A 32 37 20 30 30 30 30 0000 C:\?27 0000 000070 39 46 34 36 20 33 32 43-30 20 31 43 42 46 20 49 9F46 32C0 1CBF I 000080 4F 2E 53 59 53 0A 32 37-20 30 30 30 30 39 34 46 O.SYS?27 000094F 000090 41 20 33 32 43 30 20 31-43 42 46 20 4D 53 44 4F A 32C0 1CBF MSDO 0000A0 53 2E 53 59 53 0A 32 30-20 30 30 30 30 44 35 37 S.SYS?20 0000D57 Anyone got an idea? It's not MSBACKUP, nor SYTOS. Thanks, Chuck

17 years, 7 months

Recommendations for operating system

by evan＠snarc.net

>>> I think that this just squeaks in as being on topic. Granted, this is the on- and off-topic list, vs. cctech as frequently (and recently!) noted here. But having said that, and at the risk of starting the you-know-what conversation, I * strongly * disagree with putting "Pentium" (or anything newer than most computers based on a 286/386) into the on-topicness of classiccmp. I know this is supposed to be a vaguely family-friendly list and all, but as for the fucking 10-year-rule, I say let's fucking throw it away and never fucking bring it up again. Chronological rules don't work because of Moore's Law.

17 years, 7 months

Vacuuum tube digital circuits (50 year rule)

by swtpc6800＠comcast.net

I recently got a book titled High-Speed Computing Devices 1st ED. 1950. This is a design survey of how to build an electronic digital computer and has schematics of gates, adders and accumulators done in vacuum tubes. At the time there were around 10 working computer in the U.S. I have been adding to my magazine scans. I found a decade counter circuit implemented with four 12AU7 tubes (dual triodes) in the October 1955 Radio & Television News. (50 year rule.) http://www.swtpc.com/mholley/ElectronicsWorld/Oct1955/RTVN_Oct1955.htm It is almost the same circuit Don Lancaster implemented with RTL ICs in the February 1968 issue of Popular Electronics. http://www.swtpc.com/mholley/PopularElectronics/Feb1968/PE_Feb1968.htm Michael Holley www.swtpc.com/mholley

17 years, 7 months

A/UX 1.0

by aek＠bitsavers.org

> just curious on what 1.0 looks like http://www.aux-penelope.com/AUX_1.0.htm This pre-dates the MAE.

17 years, 7 months

Pentium for Non-PC (Was Statement & apology (was Re: 10 year whine fest)

by ken＠seefried.com

From: "Jay West" <jwest at classiccmp.org> Sean wrote.... > > I seem to recall a supercomputer made by Intel that used Pentiums. I > > forget the name though, but it was quite a behemoth of a machine from what > > little I recall (many CPUs). >Wasn't that "The Connection Machine"? Nope. Connection Machines were made by Thinking Machines, Inc., and they don't use Pentiums. They use gobs (up to something like 16k) of proprietary processors. The ASCI Red supercomputer built by Intel used PPros; see http://www.ai.mit.edu/projects/aries/course/notes/ascii_red.pdf. I think the compute nodes were pretty off-the-shelf SMP PPro designs, so some might consider it off-topic.

17 years, 7 months

looking for Darwin USIIi module (pushing OT)

by compoobah＠valleyimplants.com

O.K. - this is pushing it alot, but I'd rather buy from someone I know than an e-bay unknown. I'm looking for an UltraSPARC IIi module for Sun Darwin boards (Ultra 5/10), 333MHz or 360MHz. Thought someone might have upgraded and have one in their junk box. $9+ shipping for 333, perhaps more for a 360? Scott

17 years, 7 months

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test-drb August 2006