test-drb

test-drb@ccmp.vtda.org

101090 discussions

by ddameron＠earthlink.net

At 07:26 PM 7/24/98 -0500, you wrote: >I was digging through some S-100 cards and came upon a Godbout active >terminator. Do all S-100 buses require external termination, or did more >have it built into the mobo? Specifically, do I need to stick this card >into my IMSAI? > I don't remember many ads besides Godbout about active terminators. What seemed more important was shielding - running ground traces between the signal lines, at least for all the ads for "shielded" motherboards. Maybe a few of the lines would be helped by terminations. It was these where 1k pullup resistors wouls be put on cards. 8 cards with 1k resistors would be 125 Ohms, distributed. Terminations of longer ribbon cables seemed more important. I remember early floppy drives with a dip resistor pack (220/330 Ohms?) that you put on the last or only drive. Whatever happened to this? A few years ago I bought a 1.44 floppy drive and asked about terminations (Did it require or have them? Controlled by a jumper?) The tech support people looked at me like I was >from Mars. Doesn't scsi use terminators? Try your S-100 both ways, and see if it helps or hurts. -Dave

27 years, 10 months

FW: Writer wants to quote users

by mbg＠world.std.com

>It's mostly a problem if there isn't documentation at the place where >the machine is. I've never run into a machine that is really beyond my >experience (my experience so far is PCs and BASIC-based home micros), >but if I ever had to deal with a PDP, I'd have to spend a lot of time >asking questions here and otherwise. Not that I foresee it. PDP will >eventually vanish from industrial applications, just because they will >all eventually be damaged by floods, fires, etc. And companies go >bankrupt, too. I doubt that by the time I am 50 I will run a reasonable >risk of seeing a PDP. Also, I don't know how to _program_ a PC. I know a If people like Allison, Tim.Shoppa, John.Wilson, myself and others have our way, they won't disappear... I have some 16+ -11s of various types at home (check the home_systems page off my web page) >bit of BASIC (who doesn't?), enough to write a simple text editor or >something. I'm learning C but am stuck with pointers. I'm going to take >C++ at school starting in the fall. I've tried assembly, and do notice >that it's more straightforward than higher-level languages (I.E. there >are no ambiguous concepts like in C, it's all called what it really is), >but am not much good with things mathematical. Maybe I'll learn. With older assemblers, it was pretty straightforward. Nowever, with RISC machines which have pipelines and 'hints' and branch delays, etc. assembly is a little more difficult. Plus, where the -11 has an instruction set where you can MOV from memory to memory, memory to register, register to memory and register to register, the RISC machines generally forego memory to memory and, like the -8 before them, require you to move things through a register first... >How many instructions [on the -8]? I believe the Pentium has on the >order of 80, not sure. The -8 had 8 general purpose instructions, but it also had things called operate microinstructions, in groups, which did multiple things depending on which bits of the instruction were set. So, for example, you could clear the AC (CLA) and in a separate instruction OR the contents of the switch register with the AC (OSR), or you could combine the two operations into one instructions (since there were members of the same microinstruction group). There were also the instructions for the various devices, but they were pretty much similar in actions, but with different device numbers encoded in them. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry zk3.dec.com | | Unix Support Engineering Group | (home): mbg world.std.com | | Compaq Computer Corporation | addresses need '@' in place of ' ' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

27 years, 10 months

IBM Power supplies FS (5140?)

by mbg＠world.std.com

I would also be interested in the 5140 power supply... maybe a couple of spares... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry zk3.dec.com | | Unix Support Engineering Group | (home): mbg world.std.com | | Compaq Computer Corporation | addresses need '@' in place of ' ' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

27 years, 10 months

FW: Writer wants to quote users

by allisonp＠world.std.com

< I meant, which controllers can't correctly read 360K floppies? None that I know of... it's the 1.2mb and 1.44 cases that can be problematic(and system dependent). Allison

27 years, 10 months

S-100 bus termination

by allisonp＠world.std.com

< I was digging through some S-100 cards and came upon a Godbout active < terminator. Do all S-100 buses require external termination, or did mor No but some would ring so bad that was a solution. In most cases it was a help. < have it built into the mobo? MOBO, mobo, nogo. AH, motherboard! No they are called backplanes dear. <Specifically, do I need to stick this card into my IMSAI? If it works as is reliably, maybe not. Some z80 boards really needed it. Allison --KAA15878.901377905/europe.std.com--

27 years, 10 months

ID cute HP terminal

by fmc＠reanimators.org

Joe <rigdonj(a)intellistar.net> wrote (after John Rollins): > >Picked up a nice little HP Series 100 Model 120 45600A and a few hundred > You were lucky! Most people got stuck with a chicklet keyboard on those. > You still see ads occasionally for people looking for standard keyboards. "Chicklet" keyboard? What I've seen are two sizes of keyboard: one not much wider than the terminal housing that has the QWERTY key cluster with some function keys at the top and some compressed and doubled-up keys, and one wide keyboard with the numeric keypad off to the right. The narrow keyboard is a bit of a pain to work with because of the compromises made w/r/t key placement (e.g. the return key is relatively small), but it's usable and has full-travel keys just like the wide one. -Frank McConnell

27 years, 10 months

S-100 bus termination

by jimw＠agora.rdrop.com

At 07:26 PM 7/24/98 -0500, you wrote: >I was digging through some S-100 cards and came upon a Godbout active >terminator. Do all S-100 buses require external termination, or did more >have it built into the mobo? Originally, the Altair (S-100) bus did not define a need for termination of any kind. It was not until things on the bus started to speed up (using DMA and such) that anyone apparently thought about it. A number of companies started to put out terminator cards (active and passive) that just plugged in, and later some manufacturers (Gotbout being a notable example) began to incorporate (active) termination into their backplane boards. >Specifically, do I need to stick this card into my IMSAI? Can't hurt. I will say however, I do seem to recall seeing a board or two that would not run on a terminated bus, but that has been so long that I don't evem recall what it was. A note tho: if it is an active terminator, check the regulator voltages and filter caps on the board with no other boards in the machine. A bad terminator can introduce many more problems that it will solve. -jim --- jimw(a)agora.rdrop.com The Computer Garage - http://www.rdrop.com/~jimw Computer Garage Fax - (503) 646-0174

27 years, 10 months

Apple ][ file conversion

by pete＠dunnington.u-net.com

On Jul 24, 15:50, Max Eskin wrote: > Subject: Re: Apple ][ file conversion > Can I make use of the Centronics interface? Not really. > What type of 'serial car' do you recommend? Can I use my Apple // > w/serial port but w/o CP/M? I was economising on letter 'd's :-) You can use any serial card in a ][ or the serial port on the //, with Kermit. -- Pete Peter Turnbull Dept. of Computer Science University of York

27 years, 10 months

Back

by jim＠calico.litterbox.com

I'm back, having had a good sulk over whatever it was I left over - darned if I remember. :) I'm still doing apple2GSs, but I've expanded my collection of old machines to include an apple2e - enhanced (ordered the roms from Alltech), and just today an Amstrad ppc 640 portable, something I've wanted ever since they were on clearance at Underwear Computers (mostly a Commodore dealer at the time) for 200 bucks. The handle's broken off, but the computer functions, and runs all the dos software I've thrown at it so far. So hello again to the list. It's good to be back. -- Jim Strickland jim(a)calico.litterbox.com ----------------------------------------------------------------------- Vote Meadocrat! Bill and Opus in 2000 - Who ELSE is there? -----------------------------------------------------------------------

27 years, 10 months

Apple ][ file conversion

by allisonp＠world.std.com

< What I mean is, can I transfer files to a PC via the Centronics < interface? Can I 'print' a file in wordstar with the other end of the < cable plugged into a null modem? No/yes. No you can't as there is no software for that and I believe the apple parallel was definatly outgoing only. Work great for printing and that was what I thought you referred to. the apple][ had the problem of all disks are foreign if they weren't created on an apple regardless of the OS used. Allison

27 years, 10 months

Boards for grabs

by fmc＠reanimators.org

"Max Eskin" <maxeskin(a)hotmail.com> wrote: > What kind of boards? Was it single-board or backplane or what? > Also, what are the key differences between Hp and PC? Why not start with the key similarities, it's a shorter list. They both had 8088s and ran MS-DOS. OK, there you go. The original HP150 looks like a 9" CRT in a box, with a keyboard attached via coiled cord that goes to the back. Typically there would be an HP-IB disc drive of some sort (probably with a 91xx model number) around, most likely using 3.5" stiffies because HP was an early adopter of the Sony 90mm medium, but even without that the 150 can be used as a terminal (it mostly looks like an HP2623A monochrome graphics terminal). If you look at the back, you'll see two DB25S connectors that are serial ports, an HP-IB connector, a modular phone jack for the keyboard cable, a power switch, a battery holder, and a couple of covered slots for expansion. You might also see a thermal printer mounted in the top. OK, now let's go for some of the differences. The HP150 is not at all compatible with the IBM PC at the hardware or ROM BIOS level. The base system runs the 8088 at 8MHz, which was "faster" than the IBM's 4.77MHz, but on the other hand most applications don't access the display memory directly as on the PC -- instead they either call ROM services directly or behaved as though the console was the aforementioned 2623A terminal, which was being emulated by in-ROM code run by the 8088. So some of that extra speed was used up already. The HP150 is also called the HP Touchscreen, because it has a touch-sensitive screen, implemented as an array of IR emitters and receivers mounted across the screen from each other. You touch something on the screen, and the application gets (if it had asked for same) an escape sequence from the "terminal" indicating what region you touched. I'm thinking that the touchscreen resolution is something like 40x14 (about half the 80x27 character display resolution) but might be wrong on that. Touchscreen trivia: after a while the holes that the IR beams need to pass through get clogged up with dust, and the machine will fail its power-on self test with code F000 (I think, it's been a long time). HP came up with a fix: a little clear plastic shield that sits across the holes in the bottom bezel. Some sharp cookie at HP wrote a couple of TSRs for the 150 that emulated parts of the IBM PC ROM BIOS for video and INT 14H communications, and with these you could get a lot of PC applications to run -- for example, with those I was able to get WordPerfect 4.1 to run and even print to an attached LaserJet. Tony has a later version of the HP150, called either the 150C or the Touchscreen II. It has a 12" display, the touchscreen is optional (not too surprising, it turned out to be not real desirable because people didn't like reaching up to the screen all the time -- they'd rather rest their arms on the desk and use the keyboard and/or I guess a mouse), and better yet the touchscreen IR stuff is hidden behind smooth IR-transparent plastic that doesn't collect dust so well. All in all it arrived just before the users where I worked let it be known that they'd really rather have IBM compatibles so they could at least exchange floppies with people in remote offices. Good thing HP brought out the Vectra about that time, else we might have had to do another maintenance contract with Big Blue or something. -Frank McConnell PS- Hey Max! Trim quoted text!

27 years, 10 months

FW: More stuff for sale

by kyrrin＠jps.net

This guy's still got a stack of QBus boards and other stuff. Get with him directly if you're interested. Attachment follows. -=-=- <snip> -=-=- On Thu, 23 Jul 1998 20:40:34 -0700, in comp.sys.dec.micro you wrote: >>From: "SpaceKommander" <plectron(a)waypast.mars> >>Newsgroups: comp.sys.dec.micro >>Subject: More stuff for sale >>Date: Thu, 23 Jul 1998 20:40:34 -0700 >>Organization: Cottage Software Inc. & Internet Connection >>Lines: 43 >>Message-ID: <901376896.563602(a)linux2.cottagesoft.com> >>NNTP-Posting-Host: 205.240.70.8 >>X-Trace: 901377147 KNIMWA/AC4608CDF0C usenet53.supernews.com >>X-Complaints-To: newsabuse(a)supernews.com >>X-Newsreader: Microsoft Outlook Express 4.72.3110.1 >>X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3 >>Cache-Post-Path: linux2.cottagesoft.com!unknown(a)31.ict-max.cottagesoft.com >>Path: blushng.jps.net!news.eli.net!news.burgoyne.com!news.eecs.umich.edu!nntprelay.mathworks.com!Supernews60!supernews.com!Supernews69!not-for-mail >> >>Stuff for sale - email me. >>Still have the TK50, cable & controller. >>Full set of VENIX manuals and boxes (5 volumes) >>DECmate word processing options (1 vol) and basics(1 vol) >> >>boards: >> >>2 X G114 >>2 X G235 >>1 X H207 >>2 X H217 >>1 X M225 >>1 X M3104 >>4 X M7168 >>2 X M7169 >>1 X M7231 >>1 X M7233 >>1 X M7234 >>1 X M7235 >>1 X M7236 >>1 X M7238 >>2 X M7555 >>2 X M7606 >>2 X M7607 >>2 X M7608 >>1 X M8012 >>1 X M8027 >>1 X M8186 >>2 X M8637 >>1 X M8639 >>4 X M9047 >>2 X clearpoint Q-RAM 11B with 76 256K chips per board packed in as tight as >>you could put them. >> >>Can't remember which of the above is RQDX3, but they are gone. >> >>Bye, >> >>Tom >> >> >> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Sysop, The Dragon's Cave (Fido 1:343/272) http://table.jps.net/~kyrrin -- also kyrrin [A-t] Jps {D=o=t} Net Spam is bad. Spam is theft of service. Spam wastes resources. Don't spam, period. I am a WASHINGTON STATE resident. Spam charged $500.00 per incident per Chapter 19 RCW.

27 years, 10 months

Boards for grabs

by rigdonj＠intellistar.net

At 12:01 PM 7/24/98 -0400, you wrote: >I have a bunch of boards that I would like to move to a good home, >otherwise I will scrap them out. _ANY_ offers over shipping costs will be >considered. > >Set of boards for an HP150 system! I am not sure what the processor >is Are you kidding! It's an 8088! It runs at 5 MHz MOL just like a PC. Some 150 even had the optional 8087. The 150 was one of those ALMOST IBM PC compatibles. I have at least eight or nine of them and they're all working. Most of them are looking for homes. Hint, hint! (lots of HP house numbers, but I do see an 8041A and 9914A, neither of >which are the main processors). I have a motherboard with an jack for an >RJ45 keyboard, HPIB connector, and two RS232 ports. I also have a board >with lots of 4164 DRAMs, another with RAMs and ROMs, another mystery >board, and a module that says 3278 interface (HP #45641A). The 45641 is an optional 3278 Emulation board. It costs $1200 in the '88 HP catalog. If no one wants the boards, I'll take them for the cost of shipping. Joe > >William Donzelli >william(a)ans.net > > > >

27 years, 10 months

FW: Writer wants to quote users

by maxeskin＠hotmail.com

>< So does this mean 1.2MB floppies use a lower bps than 360K disks? >< Which controllers were these? I ought to watch out. > >no. All of them. I meant, which controllers can't correctly read 360K floppies? > >Allison > > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

27 years, 10 months

Attn: Obsolete Computer Collectors

by Joshu2415＠aol.com

Attention Collectors: I have a NEC MultiSpeed HD laptop. If you are interested, just email. Thanks For Your Time, Matt -- Joshu2415(a)aol.com

27 years, 10 months

S-100 bus termination

by allisonp＠world.std.com

< > terminator. Do all S-100 buses require external termination, or did m < Only the motherboards that didn't have active termination require a < terminator. In my experience, that's a fair number of mobo's out there My experience with 4 or 5 crates I have and many I've built up. If it runs well or the bus looks clean to the O'scope skip it. Some busses it's helps but still look terrible (altair with the original backplanes). My Northstar Horizon never needed one and it's currently running at 8mhz. The VectorMX box I have with Compupro backplane needed the terminators installed for 10mhz. The CCS I'm using with discus hard disk and 8" floppy doesn't require it at 4mhz or 6mhz. One thing that seems to be true, the longer the backplane the more likely it will ring and need termination. All Altairs seem to and IMSAIs seem to benefit if the cpu is z80 4mhz. The quietest unterminated or terminated backplane I own is an oddball 6 slot I have that is 4 layer technology with ground and power are on the middle two layers. I've found a few badly designed cpu cards and memory cards that were terrible in that they would introduce noise onto an otherwise quiet bus! Allison

27 years, 10 months

FW: Writer wants to quote users

by allisonp＠world.std.com

< So, can a standard XT controller be used for 8" drives? No/yes but, it is one that is documented and modifyable. So happens I was with NEC Microelectrnics when they introduced the 765 chip so I sorta have an advantage when it come to floppy interfacing. < For once, I used the correct terminology :) Compared to SCSI, all < IDE controllers and most non-IDE/SCSI MFM drives require very little < configuration. That's what I meant. False truism. They are about the same just differnt. IDE with the limitation of two drives really does limit the variable parameters. MFM with up to 4 drives and two schemes for addressing have to have more. SCSI you have a device address, powerup mode and a few others like termination to select from. < So does this mean 1.2MB floppies use a lower bps than 360K disks? < Which controllers were these? I ought to watch out. no. All of them. Allison

27 years, 10 months

IBM Power supplies FS (5140?)

by cgregory＠lrbcg.com

I can confirm that is indeed the part number for a 5140 power supply. If you look on the back of the power supply itself you will see IBM's declaration that it should be only used with model 5140 (in several languages!). I wouldn't mind having a spare myself. I'll contact you directly. Cliff Gregory cgregory(a)lrbcg.com -----Original Message----- From: classiccmp(a)u.washington.edu <classiccmp(a)u.washington.edu> To: Cgregory <Cgregory> Date: Friday, July 24, 1998 10:41 PM Subject: IBM Power supplies FS (5140?) > >Hi guys, > I just picked up a bunch of IBM power supplies at auction. The >auctioneer says they're for the 5140, but I don't know how you could tell. > > They're all appear to be brand new and are in the original boxes. The >box is labeled "P/N 2684220", the Power supply "P/N 2684292". Output is >15v, 2.7A. > >Anybody know what they're for? And if anybody wants one, the price is $5 >shipped, each. > >Tom Owad > >-- >Sysop of Caesarville Online >Client software at: <http://home.earthlink.net/~tomowad/> > >

27 years, 10 months

IBM Power supplies FS (5140?)

by mbg＠world.std.com

> I just picked up a bunch of IBM power supplies at auction. The >auctioneer says they're for the 5140, but I don't know how you could >tell. The 5140 is the IBM PC Convertible Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry zk3.dec.com | | Unix Support Engineering Group | (home): mbg world.std.com | | Compaq Computer Corporation | addresses need '@' in place of ' ' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

27 years, 10 months

FW: Writer wants to quote users

by pete＠dunnington.u-net.com

On Jul 25, 8:08, Pete Turnbull wrote: > Some of those HD drives can be switched between 300/360 > rpm by the signal on pin 1 of the interface, .... ...but he meant pin 2 :-) -- Pete Peter Turnbull Dept. of Computer Science University of York

27 years, 10 months

semi-off topic: how to put a 5-1/4" or 8" in those newfangled PII easy-bake oven boxes

by chris＠microgear.net

> < That's an immense exaggeration. P-II boxes a) Have no jumpers, as a > < rule b) can support a 5.25" fdd if you can plug one in. > > Why the "if you can plug one in"? Will plug and puke really work? What > do you do if it doesn't? What slot does the 8" controller from the XT > plug into on the PCI only board? > not to butt in here, but this is what i do for a "real job" so here goes... if the cable has the card-edge plug on it (or you have an adapter) the pII bioses still support 5.25" floppy, it's not plug & play, you have to tell the bios it has it AFAIK. Most drive cables still have the card-edge connector on the slot for the B: drive, too. And I have only seen one all-PCI board, most retain at least 3 isa slots because of modems and the like, so the 8" controller, if need be, would go there (I presume, never dealt with one on a PC) It's just that nothing of consequence to your average pentium II user is on anything with less capacity than a CD (with the advent of Windows 98, even the boot floppy for the first system install has become obsolete, and we can all thank Bill Gates and his fat programs for that) anymore, so you rarely see the old 5 1/4"s in those systems. But it *could* be done, and without much difficulty. Chris

27 years, 10 months

FW: Writer wants to quote users

by pete＠dunnington.u-net.com

On Jul 24, 18:02, Max Eskin wrote: > So, can a standard XT controller be used for 8" drives? You need a little adapter to shuffle the signals from the 34-pin connector to a 50-pin connector, but usually that's all. The data rate for an 8" DD (MFM) disk is the same as for a 3.5" HD (also MFM) disk. If you want to use 8" SD (FM) disks, you may need to add a jumper to the controller, as not all XT controllers can handle single-density. > So does this mean 1.2MB floppies use a lower bps than 360K disks? > Which controllers were these? I ought to watch out. Other way round. The 360K disks (better called 40-track double-sided) normally run at 300 rpm and (for MFM/double density) use a data rate of 250 bps. Before HD disks, 80-track disks were made the same way. Most HD drives, though, switch to 360 rpm and use a data rate of 300 bps (or 600 bps in HD mode). Some of those HD drives can be switched between 300/360 rpm by the signal on pin 1 of the interface, which is used for DD/HD selection. -- Pete Peter Turnbull Dept. of Computer Science University of York

27 years, 10 months

S-100 bus termination

by rigdonj＠intellistar.net

Doug, Since I got my Altair, I've been boning up on the s-100 stuff. I got an active terminator board with my Altair so that's one thing that I paid particular attention too. Here's what I found out. The first S-100 computers did not come with any termination but they soon found that the long bus lines were causing ringing and false triggering in the circuits. Ringing is caused when a signal reaches the end of an unterminated (open) line such as a data buss.* The signal reverses polarity and travels back in the direction that it came from just like an echo. When it reaches another end, it changes polarity and direction again. Now you have two positive pulses and one negative pulse where there is only supposed to be one pulse! Consider the number of times that each line branched off to a card socket and you can understand that now there where a dozen or more echos on every line and they were all at different times. It's no wonder that the systems where so difficult to make work with all the noise on the buss. The first solution was to use passive termination to try and eliminate the noise but it had limited success. This method used resistor divider networks that connected to the 0 and 5 volt power with the junctions connected to the signal lines. They had to keep the resistances high to minimize power supply loading and to prevent clamping the line so well that no signal could get through. This method wasn't entirely effective due to the combination of high clamping impedence (resistance) and unterminated branchs (sockets). The next solution was to use active termination. This method uses what amounts to small individual power supplies on each line to hold the line voltage at a level between 0 and the maximum siganl level (5 volts). This method offered a lower clamping impedence AND less power supply loading and was better able to prevent the ringing. The active terminator baords were a very popular accessory and a lot of people where making and selling them. In fact, I have an article from one of the first Byte magazines about how to make your own active terminator board. I believe that the later S-100 systems like the N* Horizon came with termination built into the MB. The ringing problem in the early Altairs was made worse by use of the long wires that ran from the MB to the front panel. Better designs eliminated a lot the sources of the ringing. FWIW this is EXACTLY the reason that you still have to terminate SCSI busses and disk drive cabling. There is still an ongoing debate in the SCSI community about the nessecity/benefits of active vs passive termination. * OK OK! Just for you purists, ringing is caused ANYTIME a signal makes a transistion from one impedence to another. The bigger the change, the bigger the reflected signal. That's why when ****power**** or signal distortion counts, you have to try and match all the impedences in the signal path. That means that your signal source such as an antenna, the signal destination such as your TV set and the interconnecting cableing all have to have the same impedence or you have to use a matching transformer to match the impedences. Go look at the back of your televison, you'll usually see a matching transformer and 300 Ohm and 75 Ohm inputs. The two inputs are there so that you can use the one that matches the impedence of the lead that brings the signal into your home. Most TV antennas have a 300 Ohm Impedence. The round coaxial cable has an impedence of 75 Ohms. If you are using it then there should also be a small matching transformer on your antenna. Joe At 07:26 PM 7/24/98 -0500, you wrote: >I was digging through some S-100 cards and came upon a Godbout active >terminator. Do all S-100 buses require external termination, or did more >have it built into the mobo? Specifically, do I need to stick this card >into my IMSAI? > >-- Doug > >

27 years, 10 months

FW: Getting rid of 11/84

by kyrrin＠jps.net

Heads up in Midland, Michigan! (or vicinity). This fellow is looking for a "recycler" to get rid of an 11/84. This sounds to me like (1), a prime opportunity for any of our rescue folk in the midwest, and (2), a prime opportunity to educate the fellow getting rid of it that a recycler is not the only answer. Please contact him directly if you can help. Thanks! Attachment follows. -=-=- <snip> -=-=- On Fri, 24 Jul 1998 20:04:52 GMT, in alt.sys.pdp11 you wrote: >>From: yellow_fiero(a)my-dejanews.com >>Newsgroups: alt.sys.pdp11 >>Subject: Getting rid of a PDP-11 follow-up >>Date: Fri, 24 Jul 1998 20:04:52 GMT >>Organization: Deja News - The Leader in Internet Discussion >>Lines: 26 >>Message-ID: <6papd5$kfh$1(a)nnrp1.dejanews.com> >>NNTP-Posting-Host: 208.154.221.12 >>X-Article-Creation-Date: Fri Jul 24 20:04:52 1998 GMT >>X-Http-User-Agent: Mozilla/4.0 (compatible; MSIE 4.01; Windows 95) >>X-Http-Proxy: 1.0 CORPNT45 >>Path: blushng.jps.net!news.eli.net!news-out.internetmci.com!newsfeed.internetmci.com!204.238.120.130!news-feeds.jump.net!nntp2.dejanews.com!nnrp1.dejanews.com!not-for-mail >> >>Sorry about the confusion, the PDP-11/84 is located in Midland, MI USA. We >>have the CPU, two RL02 disk drives, a TK50R tape, and RA81, and roughly 72 of >>each kind of process interface I/O points (analog input, analog output, >>digital input, digital output) with boards made by a company called Computec >>(later called Interautomation - located in Canada). Our DEC runs seven 500 >>gallon mixers, and has done so since the 70s. >> >>I have also found a very old PDP-11 that runs our rs-232 interface. I don't >>have a model number on it, but interestingly enough, I took the top cover off >>and it has wire-wrapped boards!!! I was surprised that it was still running >>our process, but it is! The only stampings on it are the following: >> >>M11 >>BA11E >>S-1285 >> >>located on the back panel. What could this be? >> >>Anyway, I'm still looking for a recycler. I have a complete list of all >>components and model numbers if anyone finds it necessary. Thanks for your >>responses, and I will post this note also. >> >>Robert Most. >> >>-----== Posted via Deja News, The Leader in Internet Discussion ==----- >>http://www.dejanews.com/rg_mkgrp.xp Create Your Own Free Member Forum -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Sysop, The Dragon's Cave (Fido 1:343/272) http://table.jps.net/~kyrrin -- also kyrrin [A-t] Jps {D=o=t} Net Spam is bad. Spam is theft of service. Spam wastes resources. Don't spam, period. I am a WASHINGTON STATE resident. Spam charged $500.00 per incident per Chapter 19 RCW.

27 years, 10 months

FW: WANTED: PDP-11 or PDP-8

by mbg＠world.std.com

>> Can anyone give Seth a good push in the right direction? If so, >> give him a buzz. >I posted this on Usenet specifically so everyone here on 'classiccmp' >could stop being sick of my "I want a PDP!" whining ;) > >Oh well, I'll take what publicity I can get, eh? Heck, you're not the only one who wants an -8... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry zk3.dec.com | | Unix Support Engineering Group | (home): mbg world.std.com | | Compaq Computer Corporation | addresses need '@' in place of ' ' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

27 years, 10 months

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