test-drb January 2006

test-drb@ccmp.vtda.org

240 participants
511 discussions

Got 'em! Re: Doesn't *anyone* have those 11/24 switch settings?

by charlesmorris＠direcway.com

I don't know if he saw my message here or on alt.sys.pdp11, but I have just been sent (from the latest edition 11/24 tech manual) the relevant parts of Appendix D, "PDP-11/24 CPU Modifications". These three pages explain the "Value Engineering" (replacement of logic with gate array chips) redesign of the M7133 -YA version. Most importantly they contain the new switch/jumper settings and location. Thanks Ed! -Charles

20 years, 1 month

Calcomp 1044 plotter

by legalize＠xmission.com

Does anyone know any details on this or where a manual can be downloaded? -- "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, 1 month

Non-random numbers (SIMH PDP-8)?

by Bob.Adamson＠sli-institute.ac.uk

> I was playing blackjack (BASIC program) on SIMH with my OS/8 RL02 image. I > noticed that every time I played the game the cards drawn were identical, > both by the dealer and myself! A loop to print RND(0) ten times always > shows the same ten numbers... doesn't sound very random to me :) > > Is this an artifact of SIMH, or BASIC? (Will it go away when I run the > program on the real 8/A)? > In fact many high level languages (and even implementations of hardware design languages such as Verilog) frequently support the concept of a repeatable series of pseudo-random numbers to aid in debugging with a switch to randomise the seed. Bob

20 years, 1 month

cleaning keyboards in the dishwasher

by pete＠dunnington.plus.com

On Jan 10 2006, 5:49, William Maddox wrote: > Putting a keyboard in the dishwasher doesn't strike me as a particularly > good idea. Unless you disassemble the keyboard anyway, there will be > water trapped inside that will dry out very slowly. I would agree. Although I've been known to use the dishwasher for PCBs, it's only faster than handwashing if you have several to do, and you do need to make sure you can drain the water and dry the boards off. Besides, you rarely need to wash a keyboard unless someone has poured coffee or cola into it. Usually it's only the keytops that need washed, and the rest wants a brush out. An easy way to wash lots of keytops is to put them in a pillowcase, make sure the end is well tied, and put them in a cool wash in the clothes washer. You can tumble dry them that way too. If it's just one keyboard, it's usually quicker to just handwash them in a small bowl and dry them with a towel and perhaps some compressed air, though. > I have an excellent tool for pulling keycaps that came with a Northgate > Omnikey keyboard. There are two wire loops attached to a handle. I have one of those. Far and away the best tool for the job. -- Pete Peter Turnbull Network Manager University of York

20 years, 1 month

Doesn't *anyone* have those 11/24 switch settings?

by charlesmorris＠direcway.com

for the -YA revision-E M7133 CPU? I've searched everywhere on bitsavers & google. I also posted on alt.sys.pdp11 and mailed the webmasters of several pdp-11 sites directly... please help! thanks Charles

20 years, 1 month

RL drive problems ...?

by charlesmorris＠direcway.com

There are multiple ground wires in the 40 pin ribbon cable (that becomes a round cable between the controller card and the RL02). The RL02 end (at logic board J12) has ground on: VV, UU, LL, KK, FF, EE, BB, AA, U, V, P, R, K, L and A. Having all those fail would be pretty unlikely... It wouldn't hurt, though, to have frame ground (the cabinets) all tied together and make sure they are properly grounded to the power outlet ground pin. -Charles

20 years, 1 month

Measuring regulator values on H745

by ISC277＠CLCILLINOIS.EDU

Okay, I was trying to find out if my H745 is shady, so I busted out the DVM and put the probes on the blue wire and a ground wire. (blue is supposed to be -15v) Nothing. Okay, so just to check my logic, I hooked the probe to what is supposed to be a +5v line and a ground on the same connector, and the light on the 7441 regulator goes out. Nothing on the DVM. The DVM is set to "20" in the "DC volts" area (it's one of those yellow dial type DVMs) Deposits work, but exams cause a bus error. My power supply isn't shot in all areas, so how am I measuring this wrong? I'm measuring at the power control board, where the backplane connectors are plugged in, and I'm using the BA11-K manual and prints as a reference for the wire values. What am I doing wrong?

20 years, 1 month

Need help on multibus HD controller

by dwight.elvey＠amd.com

>From: "Chuck Guzis" <cclist at sydex.com> > >On 1/10/2006 at 3:15 PM Dwight Elvey wrote: > >>Hi Chuck >> I was thinking you had information on one of the controller boards >>based on the 8X300 with the WD11xx parts. I've already gotten >>enough information on both the WD11xx and the 8X300 to create >>a simple disassembler. I also needed some hardware specific >>inputs because the board I'm looking at does specific hardware >>fuctions based on the address that the 8X300 is executing >>( similar to many bit slice designs ). This required a custom >>disassembler. > >Ah--sometimes you hafta whack me upside ma haid to the bits movin' again! > >Yes, indeed, I've got the WD1001 OEM manual--it's got schematics, >waveforms, PCB layout and interfacing instructions, including a sample >driver. It's pretty thick--best guess is about 75 pages. I could scan >it, but it'd a bit big to email. > >Cheers, >Chck > > Hi Chuck I just noticed that Al had it on his bitsavers ftp ( all 57 pages ). It should help some in figuring things out. Tony sent me a ROM dump he thinks came from one of these. Take Care Dwight

20 years, 1 month

Need help on multibus HD controller

by dwight.elvey＠amd.com

>From: "Chuck Guzis" <cclist at sydex.com> > >On 1/10/2006 at 1:08 PM Dwight Elvey wrote: > >> Sorry for the late response. This was from the begining of >>October. Can you look into your manual and see if it has >>the 8X300 controller chip with the WD11xx support chips? >>If so, I'd be interested in a copy of it. > >Hi Dwight, > >Well, yes and no. The WD book doesn't have a thing on the 8X300 or 305 >because it's not a WD part, but rather a Signetics part! I do have the >Signetics "Bipolar LSI Data Manual" which does detail both the 300 and 305; >is that what you're looking for? > >Cheers, >Chuck > > Hi Chuck I was thinking you had information on one of the controller boards based on the 8X300 with the WD11xx parts. I've already gotten enough information on both the WD11xx and the 8X300 to create a simple disassembler. I also needed some hardware specific inputs because the board I'm looking at does specific hardware fuctions based on the address that the 8X300 is executing ( similar to many bit slice designs ). This required a custom disassembler. I'm told that the TRS-80 Model4 used these parts for their hard disk controller. From looking at the code I have extracted >from the Olivetti board, I'd say they didn't modify the code from WD's original application notes. I'd suspect the same for the TRS-80 controller as well. I noticed that there is a reset action that doesn't effect the M20's controller since it is used for DMA circuits that are not even connected in this controller. I suspect this was in the original app note. I'll have to do a little net digging on the TRS-80. I suspect I'll come up with the controller commands from the computer side. These are what I'm actually looking for. Dwight

20 years, 1 month

cleaning keyboards in the dishwasher

by James＠jdfogg.com

> I know of no dishwasher detergent that contains chlorine (which is a > gas) nor large amounts of chlorine-based bleaches. (Mild) > Bleaches and brightners are common in *clothes* detergents > where there are good for stain removal, but they're *not* > good in dishwashers, where the bleach would tend to fade > patterns on crockery. Therefore dishwasher detergent > manufacturers use only very small amounts, if any, and > they're usually oxygen-based. I smell chlorine during the wash cycle and it's not coming from our private well water, and I had assumed it was in the mix to promote sanitization as it is for commercial dishwashers used in restaurants. As for chlorine being a gas, yes it prefers to be a gas at room temperature and sea level atmospheric pressures, but is released by many different forms of solid chemicals that disolve in water and release the chlorine to the water, from which it evaporates into a gas (like for swimming pool sanitization). > More to the point though, they don't contain silicon dioxide, > at least not any I've come across (btw it's silicon, not > silicone). They might feel gritty, but that's not sand, it's > solid detergent. If you dissolve dishwasher detergent (loose > powder or a tablet) in a jug of water, it will eventually > dissolve completely, leaving no sand behind. > Do you think manufacturers would put sand, one of the few > common substances that will scour glass, into a substance > used for cleaning glassware? Something in powdered detergents would "sandblast" the previously shiny surface of the soft plastic handles of our Revereware pots. Liquid detergents don't cause this problem.

20 years, 1 month

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test-drb January 2006