test-drb

test-drb@ccmp.vtda.org

101090 discussions

Trying to make a connector for my Documation M200 card reader

by djg＠drs-esg.com

>From: Vintage Computer Festival <vcf(a)siconic.com> >>From Section 5.4: Signal Characteristics: > >"The standard interface is supplied as the output of TTL type 7404. >Signal sense is specified as a Logical TRUE and is a positive level; >logical FALSE is a ground level. Circuit characteristics are shown in >figure 5-2." > >This excerpt can be found on Page 46 at: > >http://www.pdp8.net/pdp8cgi/query_docs/tifftopdf.pl/pdp8docs/74226-300dpi.p… > >(warning: this server is a bit slow) > Seems fine from here :-). It's a mighty 486-133 (and meets the 10 year rule) with a 384k DSL. Most of the documents have a link to a copy mirrired on highgate which has better connectivity. I assume it was the speed of downloading the documents you were commenting on. >Figure 5-2 is approximately this: > > o Output Drive > | TTL type 7416 > / > \ I Logical True > R / load Iload = -400 ua @ 2.4V min (with R=5.6K) > \ > | > +---------------> > | > / > | I Logical False >-----| sink Isink = 16 ma @ 0.4V max > | > \v > | > +---------------< > | > GND > >So I was told before that the way this works is that a signal will be >output as "Logical True" voltage when the data is a '1' and a "Logical >False" when the data is a '0'. But the way the connector is wired is >confusing. > >Each of the 12 data lines (for reading the holes on the card) has 2 pins: >the "data" pin and then the "data return" pin. See page 45 of the URL >above. > The return is the ground reference. >I imagine the data pin goes into one of my inputs on the 6522 (which >handles TTL levels). However, I was told by Jim Willing that I should use >an optoisolator in between the output of the reader and the 6522 because >the output voltage is clamped mechanically(?) > It appears to be driven by a TTL Logic. Page 10-3 shows the output connector which data lines go to the control card pg 10-20 and the returns go to the DC return (power supply ground). From page 5-6 which you got the output diagram from it says that twisted pair cable was recommended with the returns terminated close as possible to the data receivers. Running the grounds with the data lines in the twisted pair like that gave a little more noise immunity. The control card parts list (PG 12-31) seems to have a couple versions, normal TTL (7404), open collector outputs (7416) with pullups or open collector with inverted data (7417). >But where does the RET >(return) pin go? To ground? > Ground it to the ground of your receiver card. >Do I really need the optoisolators? Is the >6522 robust enough to just take the raw signal from the reader output? > I wouldn't bother with the optoisolators and I don't think the PDP-8 card did either. Anybody have a spare M843 CR8E card reader control or schematics for it? Polling from an Apple ][ should be slow enough that it won't see the glitches that are likely to happen on transisions of the index mark signal. I frequently will read strobe signals like that until I get the same value twice then act on it. David Gesswein http://www.pdp8.net/ -- Run an old computer with blinkenlights. Have any PDP-8 stuff you're willing to part with?

23 years, 3 months

DEC LA36 Decwriter II

by truthanl＠oclc.org

I have the engineering prints in the LA 36 Decwriter II LA36 (MPC5) sheet 5 of 8 shows 20 ma RECIEVE on J3 pin 7(+) and Pin 3(-) bridged by a 3.3 volt zener D4 746A feeding a 4N26 (E43) opto-isolator which drives a MXAA05 (Q4) driver transitor which has its collector on J4 pin 2 "S.I." (serial in) 20 ma TRANSMIT is on J3 Pin 5(+) and Pin 2(-). These pins are bridged by a 1N4004 diode D6. This diode also is parallel to the emitter/collector of Q2, an A05. which is driven by another 4N26 opto-isolator (E47). S.O. is J4 pin 4. It is driven by a 7404 inverter (E62)-(Input is 7404 pin 3 connected to the diode cathode of the opto-isolator, output is 7404 pin 4, which connects directly to J4 pin 4, "S.O." serial out) Sincerely Larry Truthan In reply to: Message: 29 Date: Thu, 26 Dec 2002 09:39:19 -0700 From: Kevin Handy <kth(a)srv.net> To: cctalk(a)classiccmp.org Subject: Re: DEC LA36

23 years, 3 months

Looking for HP 10342B Bus Preprocessor software

by charles＠socketcom.com

Glen, Thanks for the reply. The files on your ZIP archive do not want to load on my 16500A. How did you create the archive? When I look at the files with a HEX editor the seem to be in the HP LIF format. I used the LIFUTIL.EXE to create a disk that my analyzer can read but the files all appear to be corrupted. Thanks, Charles. ----- Original Message ----- From: "Glen S" <glenslick(a)hotmail.com> To: <charles(a)socketcom.com> Sent: Wednesday, December 25, 2002 10:04 PM Subject: Re: Looking for HP 10342B Bus Preprocessor software > Try the attached .zip file. > > -Glen > > > >From: "Charles Ader" <charles(a)socketcom.com> > >Reply-To: cctalk(a)classiccmp.org > >To: <cctech(a)classiccmp.org> > >Subject: Looking for HP 10342B Bus Preprocessor software > >Date: Wed, 25 Dec 2002 21:42:30 -0800 > > > >I am trying to find the software that is needed > >for an HP 16500A logic analyzer to operate the > >HP 10342B Bus Preprocessor. > > > >The HP16500A I am using has an 16510A analyzer > >module. I just need the analyzer setup files and > >inverse assembler. > > > >Thanks, > >Charles Ader.

23 years, 3 months

PCjr with sidecard

by cb＠mythtech.net

My local thrift store has (had?) a PCjr with parallel port sidecard on the 24th. They were asking $12.50 for it. No keyboard, power brick, or any other parts were visible. My guess is they had no idea what it was, since they have a policy against selling computers. It was there on the 24th, so it might still be there now. If anyone wants it, I can pick it up for them. -chris <http://www.mythtech.net>

23 years, 3 months

DEC LA36

by barry.moyer＠pason.com

Don, I am in Calgary and I have a newer LA36, but I am looking for another older LA36 with a 20mA loop connection. You can contact me at 'iamvirtual at hotmail dot com' (replace at with @, dot with .) Thanks Barry

23 years, 3 months

Free to a good home: DEC VT330

by john＠elsbree.org

Wow, there was a lot of interest in this item! It has now been claimed. Happy holidays everyone, John -----Original Message----- From: John Elsbree [mailto:john@elsbree.org] Sent: Monday, December 23, 2002 4:36 PM To: 'cctalk(a)classiccmp.org' Subject: Free to a good home: DEC VT330 Free + shipping: DEC VT330 monochrome graphics terminal. Excellent condition, in working order. Includes LK201 keyboard, VSXXX mouse, and 3 "preliminary draft" manuals: - Installing and Using - Programmer Reference Manual, Vol I: Text Programming - Programmer Reference Manual, Vol II: Graphics Programming This was a "field test" unit from the days when I was a beta site for DEC. Please reply off-list. John john(a)elsbree.org

23 years, 3 months

Looking for HP 10342B Bus Preprocessor software

by glenslick＠hotmail.com

I have them. I can send you a .zip file with them. -Glen >From: "Charles Ader" <charles(a)socketcom.com> >Reply-To: cctalk(a)classiccmp.org >To: <cctech(a)classiccmp.org> >Subject: Looking for HP 10342B Bus Preprocessor software >Date: Wed, 25 Dec 2002 21:42:30 -0800 > >I am trying to find the software that is needed >for an HP 16500A logic analyzer to operate the >HP 10342B Bus Preprocessor. > >The HP16500A I am using has an 16510A analyzer >module. I just need the analyzer setup files and >inverse assembler. > >Thanks, >Charles Ader. _________________________________________________________________ The new MSN 8: smart spam protection and 3 months FREE*. http://join.msn.com/?page=features/junkmail&xAPID=42&PS=47575&PI=7324&DI=74… http://www.hotmail.msn.com/cgi-bin/getmsg&HL=1216hotmailtaglines_smartspamp…

23 years, 3 months

Computer Audio Tape Formats

by pete＠dunnington.u-net.com

On Dec 17, 16:00, Dwight K. Elvey wrote: > Here is one that is even a little different still. > It is what is called Manchester encoding, using biphase > clocking. You don't indicate 1 or 0, you indicate a change > by a quick clock and no change by a long clock. > This is the type of encoding used on my Poly88 for > what they call PolyPhase. This runs at 2400 baud. The Exidy Sorcerer also uses Manchester encoding. For 1200 baud this equates to 1 cycle of 1200 Hz for a logic 1, and a half cycle of 600 Hz for a logic zero. For 300 baud it becomes 8 cycles of 2400 Hz and 4 cycles of 1200 Hz. It sounds like plain FSK, but if you draw the waveform for "101100" at 1200, you'll see it's actually a Manchester code: __ _____ __ __ _____ | |__| |__| |__| |_____| | --1-- --0-- --1-- --1-- --0-- --0-- > There is a standard called Byte format that uses 300 baud > and the two tones 1200 and 2400. Byte format is Kansas City format. It was proposed in Byte and formalised at the KC meeting. I think the Commodore PET uses modified CUTS. It records each block twice, which is why it's relatively slow, but also pretty robust. -- Pete Peter Turnbull Network Manager University of York

23 years, 3 months

Looking for HP 10342B Bus Preprocessor software

by charles＠socketcom.com

I am trying to find the software that is needed for an HP 16500A logic analyzer to operate the HP 10342B Bus Preprocessor. The HP16500A I am using has an 16510A analyzer module. I just need the analyzer setup files and inverse assembler. Thanks, Charles Ader.

23 years, 3 months

Test message

by kyrrin＠bluefeathertech.com

Pardon the test. Merry Christmas. ;-) -=-=-=-=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- http://www.bluefeathertech.com ARS KC7GR (Formerly WD6EOS) since 12-77 -- kyrrin(a)bluefeathertech.com "I'll get a life when someone demonstrates that it would be superior to what I have now..." (Taki Kogoma, aka Gym Z. Quirk)

23 years, 3 months

Happy Holidays

by mhscc＠canada.com

Merry Christmas, Happy Holidays, Happy New Year, Fruitful Collecting, whatever good wishes mean the most to you! It's been fun and interesting to be a part of this group for the last year and a half or so; thanks! mike

23 years, 3 months

Digital SCSI Controller ???

by sipke＠wxs.nl

I was donated a very long (full PC-XT length) PCI card with: -An Intel I960 CPU. -A Symbios Login 53C720 -Chip -A LSI LIA9616 21-40677-02 DC74468 NNM9642 WE1557 -Chip -And Various SMD ram and Rom chips Boardnumbers I found: -5022943-01-H01-P02 (SMS2) -5422944-K Adapter Is there anybody out there who's got a clue ? Sipke de Wal -------------------------------------------------------- http://xgistor.ath.cx --------------------------------------------------------

23 years, 3 months

Microwave Experiments

by marvin＠rain.org

I know this is OT, but I think most people on the list would enjoy this kind of stuff. There is also a link to a Plasmoid experiment and other interesting stuff! http://www.amasci.com/weird/microexp.html Merry Christmas to everyone!!!

23 years, 3 months

RS232 or Parallel port based keyboards and joysticks

by ram_suganthi＠hotmail.com

I found the following website that basically does what I need using a SUN Keyboard: http://atrey.karlin.mff.cuni.cz/~vojtech/input/adapters.html As for joysticks, is the gameport joysticks a version of an RS232? Is it possible to convert gameport to RS232 signals? Thanks for the responses... Ram _________________________________________________________________ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963

23 years, 3 months

VT50 connection

by Antonio.Carlini＠riverstonenet.com

>I am trying to find the 20mA connection diagram for a VT50 terminal. The VT50 is very similar to >the VT52, but has a terminal strip on the underside of the terminal where the 20mA connection is >made. I do not know which terminal is which. If anyone has a schematic of the VT50, I would very >much like a copy. A scan of the VT50/VT52 Pocket Service guide lives at http://www.vt100.net. There's a whole bunch of other VT5x stuff there too. I don't recall whether actual schematics are to be found there or not. Antonio

23 years, 3 months

Otrona Attache

by ssmith12＠rochester.rr.com

Hi J.C., I have a functioning Attache (it has some video probs; like vertical roll) which I've owned since new. Should I fix it or sell it? If so, how (either/both). And who is this Donald that has all Otrona's inventory? If you don't mind my asking.... --Steve Smith

23 years, 3 months

looking for Xerox Alto

by p_reale＠minotaurz.com

I am looking for any version of rthe Xerox PARC Alto for my museum. I am located in Southern Calif. IO might also have something equally valuable to trade (like a Silicon Graphics 2400 Turbo) in a mini.

23 years, 3 months

DEC LA36 units

by iamvirtual＠hotmail.com

Don, I am currently looking for an older LA36 which has a 20mA connection (I need it to connect to my ancient PDP-11s). Do you know the model numbers for the LA36? Thanks. --Barry >From: alderney(a)telusplanet.net (Don and Jose Woods) >Reply-To: cctalk(a)classiccmp.org >To: cctech(a)classiccmp.org >Subject: DEC LA36 units >Date: Mon, 23 Dec 2002 14:46:05 -0700 > >I have 4 DEC LA36 units in various states of disrepair. One appears to be >functioning, apart from the printhead itself, the others probably have >usable components, but I have limited ability to test much beyond the >various motor drives. If anyone needs parts I would be willing to >dismantle >and ship for the cost of the freight - which may be the biggest problem as >I >am located in Alberta, Canada. Don Woods _________________________________________________________________ MSN 8: advanced junk mail protection and 3 months FREE*. http://join.msn.com/?page=features/junkmail&xAPID=42&PS=47575&PI=7324&DI=74… http://www.hotmail.msn.com/cgi-bin/getmsg&HL=1216hotmailtaglines_advancedjm…

23 years, 3 months

Digital SCSI Controller ???

by acme＠ao.net

Got an FCC ID number on that board (assuming it was for sale in the US)? Glen Goodwin 0/0 From: Sipke de Wal <sipke(a)wxs.nl> To: Glen Goodwin <acme(a)ao.net> Subject: Digital SCSI Controller ??? Date: 12/24/2002 12:36 AM > I was donated a very long (full PC-XT length) PCI card with: > -An Intel I960 CPU. > -A Symbios Login 53C720 -Chip > -A LSI LIA9616 21-40677-02 DC74468 NNM9642 WE1557 -Chip > -And Various SMD ram and Rom chips > > > Boardnumbers I found: > > -5022943-01-H01-P02 (SMS2) > -5422944-K Adapter > > Is there anybody out there who's got a clue ? > > Sipke de Wal > -------------------------------------------------------- > http://xgistor.ath.cx > -------------------------------------------------------- >

23 years, 3 months

Free to a good home: DEC VT330

by john＠elsbree.org

Free + shipping: DEC VT330 monochrome graphics terminal. Excellent condition, in working order. Includes LK201 keyboard, VSXXX mouse, and 3 "preliminary draft" manuals: - Installing and Using - Programmer Reference Manual, Vol I: Text Programming - Programmer Reference Manual, Vol II: Graphics Programming This was a "field test" unit from the days when I was a beta site for DEC. Please reply off-list. John john(a)elsbree.org

23 years, 3 months

Need help identifying a MOSTEK chip

by phillipmilks＠juno.com

I think that there is some confusion on this part. First : Mostek wasn't in the TTL business, perse Second: I'm pretty sure that the part referenced below was a 7449, a cousin of the 7448. Thirdly : 7429 is most probably a date code. From: Tom Kwasniewski >I cannot find the 7429 in any TTL data books but I have a couple of dozen I believe that it's a BCD to 7 segment (LED) decoder with open collector outputs. Not sure of the pinout, though.

23 years, 3 months

Free to a good home: DEC VT330

by iamvirtual＠hotmail.com

John, Do you live in Canada? If so, I would be interested in the terminal. Thanks. --barry >From: "John Elsbree" <john(a)elsbree.org> >Reply-To: cctalk(a)classiccmp.org >To: <cctalk(a)classiccmp.org> >Subject: Free to a good home: DEC VT330 >Date: Mon, 23 Dec 2002 16:36:23 -0800 > >Free + shipping: > >DEC VT330 monochrome graphics terminal. Excellent condition, in working >order. > >Includes LK201 keyboard, VSXXX mouse, and 3 "preliminary draft" manuals: >- Installing and Using >- Programmer Reference Manual, Vol I: Text Programming >- Programmer Reference Manual, Vol II: Graphics Programming > >This was a "field test" unit from the days when I was a beta site for >DEC. > >Please reply off-list. > >John >john(a)elsbree.org _________________________________________________________________ MSN 8 limited-time offer: Join now and get 3 months FREE*. http://join.msn.com/?page=dept/dialup&xAPID=42&PS=47575&PI=7324&DI=7474&SU= http://www.hotmail.msn.com/cgi-bin/getmsg&HL=1216hotmailtaglines_newmsn8ish…

23 years, 3 months

Happy Holidays to all

by loedman1＠juno.com

May the New Year bring many new "Discoverys" and no "Magic Smoke" Rich

23 years, 3 months

WTD: TMS2532, HN462532 or 2732 EPROMs

by philpem＠dsl.pipex.com

Hi, Well, it looks like the deadbeat seller who was supposed to be selling me the HN462532 EPROMs has vanished. He's screwed over another 18 people besides me and has earned a reputation for ignoring emails. So, I now need to find another source for some HN462532 or TMS2532 (preferred) or 2732 (I'll need to do some bodging to use these, but still usable) EPROMs. I need at least two of the same type of device, preferably four (so I've got some spares). I've got a 10 Euro note/bill/whatever sitting on my desk that I'm willing to use as payment, or I'll pay in Pounds Sterling. Or Paypal. Your choice. It looks like my stupid mistake with the Ace put a -12V spike on one of the data lines and fried everything on the main MCU bus. That is, address decoder, secondary decoding, main RAM, CPU and ROMs. And just when I thought this year couldn't get any worse, my Sansui 210 tuner-amp decided to blow its right aux channel this morning. Although this is a bit OT, I was wondering if anyone here had a service manual for this model they could copy for me? Heck, at this point even a schematic would be useful... Thanks. -- Phil. philpem(a)dsl.pipex.com http://www.philpem.dsl.pipex.com/

23 years, 3 months

DEC LA36 units

by alderney＠telusplanet.net

I have 4 DEC LA36 units in various states of disrepair. One appears to be functioning, apart from the printhead itself, the others probably have usable components, but I have limited ability to test much beyond the various motor drives. If anyone needs parts I would be willing to dismantle and ship for the cost of the freight - which may be the biggest problem as I am located in Alberta, Canada. Don Woods

23 years, 3 months

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