test-drb February 2006

test-drb@ccmp.vtda.org

224 participants
452 discussions

by vax9000＠gmail.com

Greeting, May I ask how an MSCP SCSI controller behaves when a CDROM drive is connected to it? When there is no CD in the drive, what does "show dev" console command show? Can I take out the CD when an OS is running? Can I take out the CD after I unmount it from the file system? My controller treats a CDROM drive as a read-only HD now. Please let me know how other controllers deal with the CDROM drive. Thank you. vax, 9000

18 years, 10 months

do floppy drives need a switching p/s?

by dwight.elvey＠amd.com

>From: ard at p850ug1.demon.co.uk > >> behind the drive. Works fine on a Qume DT-8. That 24vdc supply you >> mention should do just fine, but the 5vdc draw may be heavier than you >> think, particularly if you have the standard 220/330 terminators installed. > >I've yet to see a floppy drive that used 220/330 ohm terminators. Every >one I've worked on just has a 150 ohm resistor to the +5V line. It'll >still draw the current if that line is pulled low, though. > >-tony Hi Still, he isn't going to get his 5 volts from the 24 volt supply. Dwight

18 years, 10 months

Help with HP 4951B protocol analyzer + 18179A

by Richard.Cini＠wachovia.com

John: I own a 4952+18179, which is very similar. The manual might be available >from www.yourmanualsoure.com I rented the manual for the 4952A from them for $25 for one week. Answers as follows: (a) I believe you can save the data to the tape drive. My version has the "02 option" which is a memory board which contains about 700k of RAM and 128k of battery-backed NVRAM. Your unit may or may not have that option. (b) My unit has a floppy drive, but I recall reading that the tape drive uses standard QIC tapes (don't recall the type, DC60 or DC100 I think). They should be available from various sources including eBay. (c) The vertical row of switches on the 18179 enables you to pass through or isolate various RS232 signals from the analyzer. The horizontal row of 25 switches and patch cable holes enable you to concoct various wiring schemes. (d) I believe that you can connect the video to any standard composite monitor and it will show whatever is on the internal screen. Rich -----Original Message----- From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] On Behalf Of John R. Hogerhuis Sent: Friday, February 17, 2006 11:52 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Help with HP 4951B protocol analyzer + 18179A Anybody know much about this device or have a manual? I bought it for $10 off ebay to test serial comm protocols on some of my vintage projects. It works with some caveats: a) If it's off (but plugged in) it loses its memory. Is there a backup battery inside that can be replaced? b) The tape drive may or may not work. Not sure I'll ever really need it. What kind of tapes does it use, and can they be acquired c) I'd be interested to know what the switches on the 18179A do. d) What can I hook the external video interface to? Thanks, -- John.

18 years, 10 months

hp 10391b inverse assembler toolkit availability

by alexandre＠e-secure.com.br

Mr george, did yo got the inverse assembly toolkit copy? I'm looking for that but seems impossible to be found Thanks, Alexandre Souza Brazil

18 years, 10 months

KDF11-BA (M8189) 11/23+ CPU boot an ST225 on an RQDX3?

by dbetz＠xlisper.com

I just picked up a couple of KDF11-BA CPU modules. For some reason, I thought I remembered that the 11/23+ could boot an MFM drive (ST225) attached to an RQDX3 controller but it doesn't look like that from the description of the boot options on the M8189 module. Is there an alternate boot ROM that can be installed or am I just out of luck?

18 years, 10 months

do floppy drives need a switching p/s?

by dwight.elvey＠amd.com

Hi Most 8 inch drives were originally run from linear supplies not switchers. It sounds like the supply you have is big enough to handle the 24 volt load but as I recall, there was often a surge spec along with the continuous load value. It is unlikely that you could get the additional 5V at 5W >from the same supply. The transformer is most likely sized for that application. It would actually be easier to use a 5 volt supply and add some turns to the transformer to deliver the 24 volt output. Many switchers regulate the 5 volts by adjusting the power to the transformer. By just putting a few turns on the transformer and a rectifier/filter, you would have good enough regulation to supply the 24V to a drive. You'd just need a little experimenting with the number of turns to add. Dwight >From: "Chris M" <chrism3667 at yahoo.com> > >I'm guessing so. Am wondering if the 1.67 amp 24 vdc >regulated wall warts from BGMicro are sufficient to >power an 8" floppy drive (NEC FD1165-A). Needs 24 vdc >@ 18 watts. Would love to devise a circuit to get the >5 vdc (@ 5 watts) off the same brick, but that may be >asking too much ;). > >__________________________________________________ >Do You Yahoo!? >Tired of spam? Yahoo! Mail has the best spam protection around >http://mail.yahoo.com

18 years, 10 months

token ring cards

by rtellason＠blazenet.net

Got a couple of token ring cards laying around, can any of you guys use them? Feel free to contact me off-list if so. -- 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

18 years, 10 months

SGI Indyzone CDs + older SGI demos

by compoobah＠valleyimplants.com

I have the IndiZone 3 CD- Don't know what the legal status is but as they gave them away for shipping . . . Another thing that would be nice to have would be IDO 4.1 for some of the older 4D IRI. Would be nice if SGI made 5.3 (and 6.2- almost OnTopic now) available, seeing as none of the machines that will run them are currently supported by 6.5.(x>22), but it is likely that there is much 3rd party code in there, and I doubt SGI has the extra man-hours at this point to seek it out and ask for permission from all concerned. One thing I really miss from their website was the tarballs of recommended/required patchsets for old systems- 5.3, 6.2 etc. Saved a lot of time when you have an asphaltnet between you and the nearest high-speed hookup. ftp.mayn.de/pub/really_old_stuff/irix has an eclectic collection of stuff for older IRIXes. Like vmsone.net, I don't want to see this one driven off the net so if many people want to get stuff from them, we should probably try to "netpool" there- it was down for several months a while ago already with a message about excessive bandwidth use.

18 years, 10 months

Help with HP 4951B protocol analyzer + 18179A

by jhoger＠pobox.com

Anybody know much about this device or have a manual? I bought it for $10 off ebay to test serial comm protocols on some of my vintage projects. It works with some caveats: a) If it's off (but plugged in) it loses its memory. Is there a backup battery inside that can be replaced? b) The tape drive may or may not work. Not sure I'll ever really need it. What kind of tapes does it use, and can they be acquired c) I'd be interested to know what the switches on the 18179A do. d) What can I hook the external video interface to? Thanks, -- John.

18 years, 10 months

Producing PCB's from old padmaster films?

by marvin＠rain.org

I just looked at the picture, and it appears to be of a standard printed circuit padmaster type layout. These typically had a single sheet with all the pads, another sheet with the component traces, another sheet with the non-component traces, and another with the silkscreen layer. Pins are used to align the sheets when doing the layout (and photo reductions.) The padmaster is laid out first, and then the other sheets are done with the padmaster on the bottom. The usual way of making the soldermask artwork was a bit more involved. A "picture" of the holes in the drilled board was overlayed with 1:1 photo positive of the padmaster (to block out the holes in the pads) and the resulting "picture" was made into a negative which was then blown up photographically by the amount needed by the PC house large enough (usually about 0.005" - 0.010") so the soldermask wouldn't bleed onto the pads when it was silkscreened onto the board. Yes, dry film solder mask could have been used with a smaller enlargement, but it was not generally used on high volume production boards (too pricy.) Also, the adhesive on the tape tends to dry out/become brittle with time, so I would be *very* careful in handling these layouts. Any engineering photolab can reduce them to 1:1 positives and negatives. When you find a PC shop to manufacture the boards, they should also have the contacts to get them reduced. Again, unless you have the drill drawing, you will need to make one. *Usually*, different pad sizes were used for the different size holes. Double check the final artwork to make sure that a piece of tape didn't fall off the original artwork. It will usually be "obvious" since there will be either pads with nothing attached, or traces that just end. FYI, another way of laying out boards was to use red and blue tape with black hole pads. One color was used for the component side traces, and the other color was used for the non-component side traces. The artwork would then be done by using filters to create the photo artwork. > Someone just contacts me off-list with a place that may help, here is > one set I'm looking to reproduce: > > http://www.atarimuseum.com/computers/8BITS/1200xl/s-16/s-16-proto_PCB_RevX8… > > Curt

18 years, 10 months

← Newer
1
...
15
16
17
18
19
20
21
...
46
Older →

Jump to page:

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb February 2006