test-drb February 2006

test-drb@ccmp.vtda.org

224 participants
452 discussions

sexy PDP-11/44 panel (was: Re: Original 11/74 front panel)

by cheri-post＠web.de

> I guess there are more people on the list who have a boring > PDP-11/44 with a dull panel, that would like to make the /44 > more sexy with an 'appropriate' panel. The "upgrade" is, > of course, done in such a way that it can be undone ... > I (we) do not have a /74 panel :-( Well Henk, at least, you HAVE PDPs with a "lights and switches" console. Please think of those (I'm part of them!) who are eager to get one. 11/24 or 11/73s are nice, but unfortunately not the same. Today, it's almost impossible to get one...if you don't consider the possibility of buying one for a 1000$. THAT'S definitely the case for students like me. ... 11/74s are really cool! Thanks for that nice picture, Tim. Regards, Pierre ______________________________________________________________ Verschicken Sie romantische, coole und witzige Bilder per SMS! Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193

20 years

Mythbusters

by chrism3667＠yahoo.com

although its been refuted on this list, I do seem to recall reading that plugging a 5151 into a CGA card was catastrophic - read IMPLOSION. Alas only a suburban legend. And as much as Id like to see it (not that I have anything against 5151s), Im not going to be trying it anytime soon. No way, no how... --- cctech-bounces at classiccmp.org <cclist at sydex.com> wrote: > On 2/2/2006 at 5:29 PM Richard wrote: > > >Yes, its referred to as the "Killer Poke". There was also something > >you could do on early IBM PC graphics adapaters where you could fry > >the monitor by writing a zero value to a frequency register, IIRC. > > All you really had to do to fry the MDA on a PC was to program the > horizontal frequency a few KHz too high. The display would keep sync, but > eventually the HOT would get smoked. I fried a couple of HOTs while > working on SIMGA--fortunately, the distributor for the monitors was about 6 > blocks away and they had an ample supply of replacement parts. > > But heck, that isn't dramatic. The display just goes dark. > > I want a Star Trek-type "ERROR ER ROR MUST RE EVALUATE" type of smoke and > sparks type of software failure ending in an explosion of thermonuclear > proportions... > > Cheers, > Chuck > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

20 years

bus connectors I could use

by rtellason＠blazenet.net

If anybody has them to spare, I could use *one* STD bus connector (okay, and maybe a spare :-) for the spot on my BigBoard 2 that allows for that... I also have a partially-constructed S-100 backplane, made by Vector (I'm still missing a few Tantalum caps for the active termination portion) but need the S-100 connectors to go into it. Not something I can afford to invest in at this point in time, funds being rather tight, but if you have some of these connectors that you'd be willing to part with... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

20 years

Mounting new hardware in vintage hardware

by vp＠cs.drexel.edu

Roy J. Tellason <rtellason at blazenet.net> wrote: > But no drill press or serious holding hardware to do that in. Surely you can improvise, just screw the metal bracket to a piece of flat wooden surface (e.g. leftovers from IKEA bookcases). I also find that its easier if you start with a very thin bit to drill a guide hole. > One further complication is that the ones for floppies were designed to hold > the drive right flush up against the front panel, while the ones for HDs > held it much further back, giving better airflow. If I *did* drill holes > for the purpose the HD would be much too far forward, depending on which > case I was sticking it in. Ah, yes, in that case you may want to copy a scheme that was used on Olivetti servers. These had 10-15 5mm holes on the plastic panel sitting in front of the drive (the thing you remove if you want to mount a tape drive or CDROM). These provided more than adequate ventilation for the drives which were placed just behind the panel. I have used the same trick on a machine that had a bunch of Seagate 75Gb SCSI drives (these were getting real hot) and it allowed sufficient cooling to let them operate 24/7 in an office environment. **vp

20 years

HP 9000 V-class

by julesrichardsonuk＠yahoo.co.uk

Anybody familiar with these boxes? We've acquired one at Bletchley (a 9000/800/v2200) but no documentation, so getting an OS installed on it is proving to be a nightmare - hence finding someone who has details and would be willing to look up a few odds and ends would be most handy! HP's website seems spectacularly useless in documenting the hardware / resident firmware and only covers the OS side of things :( cheers Jules

20 years

PDP-11 Integer Divide Instruction "Div"

by jhfinedp3k＠compsys.to

Hi All, I have noticed what may be an interesting result when I use the PDP-11 Integer Divide Instruction "Div". Since I have noticed at least one individual who worked on the microcode for the PDP-11, perhaps there is an explicit "Yes / No" answer to my question: If I divide 196612 by 3 - i.e. "Div (R2),R0" where R0 = 3, R1 = 4, (R2) = 3 the result (in addition to the condition bits) is R0 = 1, R1 = 1 which is exactly correct if the quotient is regarded as a 32 bit result with R0 being the low order 16 bits of that result and the high order 32 bits are somewhere else - probably inaccessible as far as programming is concerned, but easily obtained by: Mov R1-(SP) ; Save low order 16 bits of dividend Mov R0,R1 ; Divide high order 16 bits Clr R0 ; of dividend Div (R2),R0 ; by the divisor Mov R0,R3 ; Save high order 16 bits of quotient Mov R1,R0 ; Divide the remainder Mov (SP)+,R1 ; of the dividend Div (R2),R0 ; by the divisor i.e. R3 now contains the high order 16 bits of the 32 bit quotient with R0 holding the low order 16 bits of the 32 bit quotient Reason for the question: I require the complete quotient ONLY when the remainder is ZERO (specifically when the dividend is not a prime number since (R2) is ALWAYS a prime number). Thus, if I can avoid performing the first division except when the remainder is zero and I require the high order 16 bits of the quotient to continue, I can optimize the code. Thus far I have tested the code on numbers up to 100,000,000 when I divide by 3 and the results are always correct. Can anyone confirm what I have found in practice? Even better would be a method of retrieving the high order 16 bits of the quotient in a manner which takes fewer instructions and without a second divide instruction! For those who are interested, I am attempting to calculate the Mobius Function - mu(n). If you check on Google, mu(n) requires the number of factors of n. Thus while a sieve program can be used to remove the prime numbers, the rest of the numbers must be factored to obtain the number of factors. Sincerely yours, Jerome Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.

20 years

Top Antique Computers on Camera Contest! was: RE: IBM 7090 in "Dr.Strange...

by Useddec＠aol.com

I think the ANSF-Q7 (SAGE) was seen on Voyage To the Bottom of the Sea. I've also seen it on several other movies and TV shows, but don't recall which ones. Paul

20 years

Add-on boards for VT-100 backplane

by legalize＠xmission.com

What cards exist that you can plug into the VT-100 backplane? Has anyone any experience with making your own card to plug into it for a graphcis overlay feature? -- "The Direct3D Graphics Pipeline"-- code samples, sample chapter, FAQ: <http://www.xmission.com/~legalize/book/> Pilgrimage: Utah's annual demoparty <http://pilgrimage.scene.org>

20 years

DAP-610 on VCM

by aek＠bitsavers.org

http://marketplace.vintage.org/view.cfm?ad=2080 Someone needs to save this. In the ideal world, it should go to the CHM, though I don't know if they have one of the DAP series, or even if they care (it appears all they want are boxes with lights to go "ohhhh ahhhh" at). There were not many sold (like 5...), and it says it has the software. Normally, they would be attached processors to something like a Sun. Dick Lyon had a small one in Apple ATG in the late 80's.. http://www.new-npac.org/projects/cdroms/cewes-1999-06-vol1/nhse/ hpccsurvey/orgs/cpp/cpp.html This may be the same machine offered back in 2003 on the list.

20 years

Classic computers on TV - Seinfeld

by tosteve＠yahoo.com

Episode 28 - "The Alternate Side" When Jerry is trying to pick up his rental car, the agents are using TRS-80 model III computers, I believe. http://black-celebration.net/caps/displayimage.php?album=21&pos=43 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

20 years

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test-drb February 2006