test-drb July 2004

test-drb@ccmp.vtda.org

259 participants
518 discussions

OT: Bell&Howell TSC-200 System Calibrator????

by SUPRDAVE＠aol.com

In a message dated 7/22/2004 7:20:42 PM Eastern Daylight Time, rigdonj(a)cfl.rr.com writes: I found one of these a couple of days ago. Does anyone here know anything about them? I'm trying to figure out what some of the pushbuttons do. I work for the company, but all info on older stuff cannot be found. -- I am not willing to give up my liberties for the appearance of 'security'

20 years, 5 months

Anybody going to VCF-East have cheap working Oscilloscope/Logic Analyzer to sell?

by cbajpai＠comcast.net

I have a couple of old 8K PET 2001s that need to be fixed.if anyone has some extra test equipment that they no longer need I (and the PETs) would really appreciate it! Let me know what you have and want for it. Even if you aren't going to VCF/East I'd pay all the shipping costs. Looking forward to seeing you guys at VCF/East! Thanks, Chandra

20 years, 5 months

OT: Bell&Howell TSC-200 System Calibrator????

by rigdonj＠cfl.rr.com

I found one of these a couple of days ago. Does anyone here know anything about them? I'm trying to figure out what some of the pushbuttons do. Joe

20 years, 5 months

Anybody here work on HP 7905/7920 disk drives?

by dwight.elvey＠amd.com

Hi Joe Water doesn't even touch the goop I'm seeing. :( Dwight >From: "Joe R." <rigdonj(a)cfl.rr.com> > > Soap and water usually cleans up the black foam. I'm not sure about this >green stuff. The black stuff practically dissolves in water. > > OH HELL! I'll go find out. Yeap. Water took MOST of it right off. I've >cleaned up everything and it's drying now. I'll try to take some pictures >tomorrow. > > Joe > >At 01:58 PM 7/22/04 -0700, you wrote: >>Hi >> What is the best way to clean this self-destructing foam. >>I've tried a couple of things without luck. >>Dwight >> >> >>>From: "Joe R." <rigdonj(a)cfl.rr.com> >>> >>>At 11:57 AM 7/22/04 -0500, you wrote: >>>>I'd be quite interested in these, as I'm sure some other people would be >>>>too. Any chance we could get pictures? >>> >>> They wouldn't do any good. There's pieces of green foam stuck all over >>>the parts. >>> >>> Joe >>> >>> >>>> >>>>Jay >>>>----- Original Message ----- >>>>From: "Joe R." <rigdonj(a)cfl.rr.com> >>>>To: <cctalk(a)classiccmp.org> >>>>Cc: <dancohoe(a)oxford.net> >>>>Sent: Thursday, July 22, 2004 10:39 AM >>>>Subject: Anybody here work on HP 7905/7920 disk drives? >>>> >>>> >>>>> Went scrounging yesterday and found a small plastic box of what looks >>>>> like HP disk drive test/alignment accessories. Parts include 07905-60049, >>>>> 07905-60039, 5061-1386, 07920-60030 and 07920-62421. Anybody need this >>>>> stuff? The box is filled with that old self-disintegrating foam so the >>>>> stuff will need to be cleaned up but it looks like it's in very good >>>>> condition (the box is in rough shape). >>>>> >>>>> Joe >>>>> >>>> >>>> >>> >> >> >> >

20 years, 5 months

Commodore Pet ROM trouble... EPROM Substitutes...

by RMaxwell＠atlantissi.com

Oops. Error! Correction: The 2532 Vpp is always +5V when reading, and would keep 2732 outputs always OFF. The 2532 has just one enable pin, while the 2732 has two. Better to tie 2732-20 to ***2532-20*** (or to GND - outputs would be always enabled when the chip is selected). Sorry 'bout that. Best of luck, Bob

20 years, 5 months

Commodore Pet ROM trouble... EPROM Substitutes...

by pete＠dunnington.u-net.com

On Jul 22, 21:17, Philip Pemberton wrote: > In message <10407221840.ZM22794(a)mindy.dunnington.u-net.com> > Pete Turnbull <pete(a)dunnington.u-net.com> wrote: > > On Jul 22, 13:09, wolfgang(a)eichberger.org wrote: > > That should certainly work for reading. > > > Not if those pin names are correct. !G is Output Gate, i.e. !OE. I'd connect > all the pins straight through, except 18, 20 and 21. > > 2532 socket 2732 ROM > 18 A11 21 A11 > 21 VPP no-connect > 20 !E (PD/PGM) 18 !E > 14 Vss 14 and 20 (Vss and !G respectively) > Anything else is connected straight through > > I *think* that'll work. The only difference is that this grounds the 2732's > !G (Output Enable) pin instead of rigging it high (Vpp is usually connected > to +5V for EPROMs that are wired for reading only). Yep, well spotted. -- Pete Peter Turnbull Network Manager University of York

20 years, 5 months

Booting a VAXstation 4000 VLC off the hobbyist boot CD-ROM

by KVanMersbergen＠RandMcNally.com

David- It might be the drive itself, I'd try a 1X drive if you have one. -----Original Message----- From: David Betz [mailto:dbetz@xlisper.mv.com] Sent: Wednesday, July 14, 2004 4:00 PM To: On-Topic and Off-Topic Posts Subject: Booting a VAXstation 4000 VLC off the hobbyist boot CD-ROM I have my VAXstation 4000 VLC running to the ">>>" prompt and would like to boot the hobbyist CD-ROM to install VMS on the hard drive but I'm having trouble getting the CD-ROM to boot. If I type 'boot dka400' at the prompt, the CD-ROM spins up and I get the text "-DKA400" displayed on the console but then I get the ">>>" prompt again. Can anyone tell me why that would happen? I'm using a NEC CDR-1910A SCSI CD-ROM drive set to SCSI ID 4. *************************************************************** This E-mail is confidential. It should not be read, copied, disclosed or used by any person other than the intended recipient. Unauthorized use, disclosure or copying by whatever medium is strictly prohibited and may be unlawful. If you have received this E-mail in error, please contact the sender immediately and delete the E-mail from your system. ***************************************************************

20 years, 5 months

FW: RK05 question

by GOOI＠oce.nl

Hmm. So in your mind experiment you keep the 12 sector pulses and the track pulse, and deliver the track pulse with 16 sector pulses to the hardware of the drive logic. Using the 12 sector pulses will probably produce a more stable 16 sector pulse signal as the PLL is kept in lock in shorter intervals. But what would the PLL circuit do when it gets 12 sector pulses (that is fine) *_and_* at some odd moment the extra track pulse ...? I was thinking of *only* the track pulse and get the PLL locked on that pulse only, assuming that the stability of the PLL is sufficient for one revolution. From the N divider is would be easy to get the sector pulses. So, I cover all the sector slits on the hub of the disk. But as you said (I did not know that part and did not check on an RK05 pack I have at home), the track pulse is not halfway two sectors. Some separate binary comparator could check the N divider outputs and then you simply set a binary number to the comparator when it should give the track pulse. - Henk. > -----Original Message----- > From: cctalk-bounces(a)classiccmp.org > [mailto:cctalk-bounces@classiccmp.org]On Behalf Of Paul Koning > Sent: dinsdag 13 juli 2004 16:38 > To: cctalk(a)classiccmp.org > Subject: RE: FW: RK05 question > > > >>>>> "Gooijen" == Gooijen H <Gooijen> writes: > > Gooijen> Isn't the track index pulse == the one pulse that is fed to > Gooijen> the PLL phase comparator? That pulse is used to synchronize > Gooijen> the oscillator that must run at 12 (or 16) times the > Gooijen> frequency between 2 sector pulses to generate the (missing) > Gooijen> sector pulses .... or am I mistaken here? > > No, what I meant is to derive the 16x sector pulses from the 12x > sector pulses, keeping the track pulse as it is. But either would be > possible. > > The track slot is close to the first sector slot (it's not halfway > between sectors). What I don't remember is how close, or whether the > sector slot spacing around the track index is the same as elsewhere, > or different. That would affect the PLL design a lot... > > To do this right would require measuring the angular positions of all > the slots on a 12 sector and 16 sector pack, to see just what the > pattern looks like and how to transform one to the other. > > paul

20 years, 5 months

Anyone have/know of Persci drives, parts

by Watzman＠neo.rr.com

I need some Persci 8" drives (model 270 or 277) and/or parts to repair them for some systems. The part that I need most is the very large circuit board on the right side of the drive. Anyone know of a source? [I'm sure that there are thousands of them in various landfills, but that won't help me ......] Thanks, Barry Watzman Watzman(a)neo.rr.com

20 years, 5 months

Anybody here work on HP 7905/7920 disk drives?

by dwight.elvey＠amd.com

Hi What is the best way to clean this self-destructing foam. I've tried a couple of things without luck. Dwight >From: "Joe R." <rigdonj(a)cfl.rr.com> > >At 11:57 AM 7/22/04 -0500, you wrote: >>I'd be quite interested in these, as I'm sure some other people would be >>too. Any chance we could get pictures? > > They wouldn't do any good. There's pieces of green foam stuck all over >the parts. > > Joe > > >> >>Jay >>----- Original Message ----- >>From: "Joe R." <rigdonj(a)cfl.rr.com> >>To: <cctalk(a)classiccmp.org> >>Cc: <dancohoe(a)oxford.net> >>Sent: Thursday, July 22, 2004 10:39 AM >>Subject: Anybody here work on HP 7905/7920 disk drives? >> >> >>> Went scrounging yesterday and found a small plastic box of what looks >>> like HP disk drive test/alignment accessories. Parts include 07905-60049, >>> 07905-60039, 5061-1386, 07920-60030 and 07920-62421. Anybody need this >>> stuff? The box is filled with that old self-disintegrating foam so the >>> stuff will need to be cleaned up but it looks like it's in very good >>> condition (the box is in rough shape). >>> >>> Joe >>> >> >> >

20 years, 5 months

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test-drb July 2004