test-drb January 2001

test-drb@ccmp.vtda.org

181 participants
415 discussions

Digital Ethernet Local Network Interconnect (DELNI)

by hsappleton＠sprintmail.com

I recently came into possession of about half a dozen of the Digital Ethernet Local Network Interconnect (DELNI). This is about 4 more than I need. I am willing to trade them singularly for something anyone has that can peek my interest. I am particularly interested in items that is associated DEC, HP and IBM workstation Headley ===================================================================== PH: 302-798-1930 Fax: 302-798-0243 Mobile: 302-983-4293

25 years, 1 month

"Real" emulation...

by ajp166＠bellatlantic.net

From: Tony Duell <ard(a)p850ug1.demon.co.uk> >> the add-on A-400 oscillator, used to tune your Moog back up as it drifted >> off pitch, which they all did more or less constantly. The documentation >> mentions retaining this feature even though the emulation no longer >> drifts. >> >> But: why not? Shouldn't it drift, actually? > >Hmm... This is a difficult problem. It was extreamly annoying trying to cut a track and keep pitch over time. >But as regards undesirable behaviour (computers that suffer from logic >problems in the design, synthesisers that drift), well, IMHO the >simulator should be _able_ to exhibit that behaviour as well. A processor >designed with a race hazard so that 1 cycle in 10^11 (or so) it does the >wrong thing should be emulated as having that problem. Maybe there should >be an option to turn it off (on the emulator) though. The bset examples is the 8085 and z80 undocumented instructions that all the vendors faithfully reproduced for that exact reason. >It's not going to be trivial to implement that. Not only do you have to >be able to emulate the machine when some components aren't working >properly (how many people know what (say) a PDP8/e would do if a given >gate was stuck at 0 or stuck at 1, what would happen if one input on a >multi-input gate stopped working), you also have to allow for idiots like >me who want to 'cut tracks', inject arbitrary signals, etc. Are you going >to allow me to 'desolder' components and test them separately. I am >thinking about gates that 'go slow' -- I've had 74S TTL that tests fine >at slow speeds (switches and LEDs on a breadboard) but which fails when >run at full speed. This sort of fault is painful to find because often >the machine works correctly when single-stepped as well. Yes emulating N^X error states is not a lot of fun for something as simple as PDP-8 and it gets worse for more complex systems. Not many would want that save for those training in repair methods. Allison

25 years, 1 month

"Real" emulation...

by ajp166＠bellatlantic.net

From: Will Jennings <xds_sigma7(a)hotmail.com> >said hardware in operation... From the Ubergeek perspective, then yes, I'd >think you want the emulator to be weird like the real hardware, though it >could be good to have a less flaky version for those who are merely curious >and have never experienced the real hardware... On the other hand, if you're They important item is to be sure the said oddity is really real or some side effect of age, errors in assembly or just bad programming. I also agree with Will, introducing errors is not a desired case. Most floppies actually worked with reasonable reliability. Allison

25 years, 1 month

RD-51's

by ajp166＠bellatlantic.net

From: jeff.kaneko(a)juno.com <jeff.kaneko(a)juno.com> > >Anybody want some rd-51's? They're the real >McCoys, blessed and badged by DEC. They even >come with sleds. 10mb for those that don't know. Also the sleds are handy for those needed to mount a drive in many of the DEC cases. Allison

25 years, 1 month

Fwd: Re: OT-ish : Centronics printer port timing

by rivie＠teraglobal.com

>Many years ago, a company I used to work for did a >Centronics port for TURBOchannel. The timing we wound >up using was data stable 500nS before strobe, strobe >lasts 1mS, data remains stable until 500nS after >strobe. IIRC, this is fairly close to what we found >in Centronics documentation, but I don't remember >what documents we found or what the exact numbers >in that document were. I'm sorry; I had a bit of a brain fart. The strobe lasts for one microsecond, not one millisecond. -- Roger Ivie rivie(a)teraglobal.com Not speaking for TeraGlobal Communications Corporation

25 years, 1 month

VT510 keyboard?

by cmcmanis＠mcmanis.com

Does the VT510 use a PC type PS/2 keyboard? (ie can I steal one from a PC and use it on the terminal?) --chuck

25 years, 1 month

Annoying high pitched squeal

by eweidenh1＠hotmail.com

I recently acquired an Atari 1040f from a friend. It came with the SC1224 color monitor which, for some reason gives off a really awful high pitched sound. Does anyone have some idea why this might happen? It scares my cat. Thanks. _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.

25 years, 1 month

FREE HD46505 CRT controller chips

by r_beaudry＠hotmail.com

Hello all, I have 19 spare Hitachi HD46505 CRT controller chips that I'd like to offer to the list members for free (you don't even have to pay postage). These chips are UNTESTED, so I make no guarantees... I believe, from looking at datasheets, that these are either a drop-in for, or very similar to, the 6845 CRT chip (the pinout is the same, and two of these are even marked with both the HD46505 and 6845P markings). However, I could be wrong, so caveat emptor... In order to be fair to all list members who might be interested, there are some rules.... - I will take off-list, emailed requests until Midnight, Jan 10, 2001 (US Eastern time). - You can request as many of the chips as you want, but depending on interest, you may only get one or two. - If more than 19 people respond, I will draw emails at random to give the chips out. I am willing to ship anywhere in the world that the US Postal Service allows me to ship the chips. Again, totally free... No, this is not some advertising scheme, and no, I am not harvesting any information from this. I have received a lot of help from list members in the past, and since I haven't been able to answer many questions on the list, this is my form of repayment... Thanks! Rich B.

25 years, 1 month

Real emulation

by ois140＠hotmail.com

So, I guess I'll have to add sound (and smell?) to my Wang minicomputer emulator to emulate the failure mode of the hard disk drive.... _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com

25 years, 1 month

O.T.: Compu-Voxx ??

by lgwalker＠look.ca

I have a box in a nice well padded soft-case called a Compu-Voxx. It was manufactured by Manutronics. It has a removable antenna. It appears to be some sort of transmitting device for sending messages. Based on the instructions on the face you record a message (to a chip I imagine) and then send if the selectable digital readout frequency is between 88.1 and 107.9. That sounds like the AM band to me. Could this be some sort of civil defense emergency device ? It has a 5-pin DIN plug for power which unfortunately didn't come with it which is not an unsurmountable problem. Anyone know what this might be. ciao larry Reply to: lgwalker(a)look.ca

25 years, 1 month

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test-drb January 2001