RE: Testing a 74S240

works. Sorry for the noise. Regards Rob > -Original Message- > From: Guy Dunphy > Sent: 01 May 2022 01:22 > To: r...@jarratt.me.uk; Rob Jarratt ; General > Discussion: On-Topic and Off-Topic Posts > Subject: Re: Testing a 74S240 > > At 11:25 PM 30/04/2022

Re: Testing a 74S240

At 11:25 PM 30/04/2022 +0100, you wrote: >In trying to fix my M7133 CPU from my 11/24 I thought I had identified a >failed 74S240. However, when I replaced it (while adding a socket), the >fault remained. So, I guess the original chip may not be faulty. I decided >to test the original chip on a bre

Re: Testing a 74S240

his is not necessary. Is there a flaw in my testing method? Have I misunderstood something fundamental? Regards Rob According to the TI TTL data book 100mA is not out of line.  I just tried one and my power supply indicated about 125mA. Grounded pin 19 and with pin 13 open pin 7 meas

Re: Testing a 74S240

y > understanding is that this is not necessary. > > > > Is there a flaw in my testing method? Have I misunderstood something > fundamental? > > > > Regards > > > > Rob There is a TI datasheet here: https://www.ti.com/lit/ds/symlink/sn74ls244.pdf

Testing a 74S240

gain to no avail. I noticed that the chip (original and replacement) was drawing 100-110mA from the bench PSU, which seems a bit high. I wondered if I might need a pull up resistor on the output, but my understanding is that this is not necessary. Is there a flaw in my testing meth

Re: testing

> J > > -Original Message- > From: William Sudbrink > Sent: Thursday, March 10, 2022 4:29 PM > To: jw...@classiccmp.org; 'General Discussion: On-Topic and Off-Topic Posts' > > Subject: RE: testing > > ACK > > -Original Message- > From: c

RE: testing

n: On-Topic and Off-Topic Posts' Subject: RE: testing ACK -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of jwest--- via cctalk Sent: Thursday, March 10, 2022 5:29 PM To: 'General Discussion: On-Topic and Off-Topic Posts' Subject: testing

RE: testing

? -Original Message- From: cctalk On Behalf Of jwest--- via cctalk Sent: Thursday, March 10, 2022 2:29 PM To: 'General Discussion: On-Topic and Off-Topic Posts' Subject: testing Test test

Re: testing

On-Topic and Off-Topic Posts' > > Subject: testing > > Test test > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus >

RE: testing

ACK -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of jwest--- via cctalk Sent: Thursday, March 10, 2022 5:29 PM To: 'General Discussion: On-Topic and Off-Topic Posts' Subject: testing Test test -- This email has been checked for viruse

testing

Test test

RE: Testing H745 Regulators

I found a 400V part on Mouser and ordered that. > -Original Message- > From: Jonathan Chapman > Sent: 18 February 2022 21:23 > To: r...@jarratt.me.uk; Rob Jarratt ; General > Discussion: On-Topic and Off-Topic Posts > Subject: RE: Testing H745 Regulators > > &g

RE: Testing H745 Regulators

> I always forget that the VAC is the RMS and not the peak-to-peak. I will > look for a minimum rating of 100V. 600V bridge modules are often more cost effective, and more likely to be in stock. That's why I went with the Vishay part I used. If you can't find what you need due to shortages, you

Re: Testing H745 Regulators

On 2022-Feb-17, at 11:40 PM, Rob Jarratt wrote: >> -Original Message- >> From: Brent Hilpert >> On 2022-Feb-17, at 2:38 PM, Rob Jarratt wrote: -Original Message- From: Brent Hilpert 20V on a 10 ohm load: current = 2A. 15V, 1.5A. In this regulat

RE: Testing H745 Regulators

> -Original Message- > From: Brent Hilpert > Sent: 18 February 2022 06:30 > To: r...@jarratt.me.uk; General Discussion: On-Topic and Off-Topic Posts > > Subject: Re: Testing H745 Regulators > > On 2022-Feb-17, at 2:38 PM, Rob Jarratt wrote: > >> ---

Re: Testing H745 Regulators

On 2022-Feb-17, at 2:38 PM, Rob Jarratt wrote: >> -Original Message- >> From: Brent Hilpert >> >> 20V on a 10 ohm load: current = 2A. >> 15V, 1.5A. >> >> In this regulator design there is no path for more current than that which >> the >> load draws, aside from temporary peak currents t

RE: Testing H745 Regulators

> Discussion: On-Topic and Off-Topic Posts > Subject: RE: Testing H745 Regulators > > I used a Vishay GBPC3506W-E4/51, which is 600V 35A, 400A inrush rated. > Looks like they're currently on-order at Mouser, I don't know about other > suppliers. > > The GBPC3506W

RE: Testing H745 Regulators

> > > > Discussion: On-Topic and Off-Topic Posts' cctalk@classiccmp.org > > > > Subject: RE: Testing H745 Regulators > > > > Sorry it has been a while responding. I have been looking further at my > > H745 > > > regulators this evening. Below is

RE: Testing H745 Regulators

m: Rob Jarratt > Sent: 17 February 2022 22:38 > To: 'Brent Hilpert' ; r...@jarratt.me.uk; 'General > Discussion: On-Topic and Off-Topic Posts' > Subject: RE: Testing H745 Regulators > > Sorry it has been a while responding. I have been looking further at my H74

RE: Testing H745 Regulators

3 > To: r...@jarratt.me.uk; Rob Jarratt ; General > Discussion: On-Topic and Off-Topic Posts > Subject: Re: Testing H745 Regulators > > On 2022-Jan-26, at 3:41 PM, Rob Jarratt via cctalk wrote: > > I am trying to test a couple of H745 regulators with a DC bench PSU > >

Re: Testing H745 Regulators

; cctalk@classiccmp.org>: > I am trying to test a couple of H745 regulators with a DC bench PSU and I > am > having some problems with testing them. > > > > My bench PSU is a twin unit so I can supply the +15V required as well as > the > "AC" input using

Re: Testing H745 Regulators

On 2022-Jan-26, at 3:41 PM, Rob Jarratt via cctalk wrote: > I am trying to test a couple of H745 regulators with a DC bench PSU and I am > having some problems with testing them. > > My bench PSU is a twin unit so I can supply the +15V required as well as the > "AC" i

RE: Testing H745 Regulators

00:11 > > > > To: r...@jarratt.me.uk; Rob Jarratt robert.jarr...@ntlworld.com; General > > > > Discussion: On-Topic and Off-Topic Posts cctalk@classiccmp.org > > > > Subject: RE: Testing H745 Regulators > > > > Any chance you have a second supply yo

RE: Testing H745 Regulators

> -Original Message- > From: W2HX > Sent: 27 January 2022 00:11 > To: r...@jarratt.me.uk; Rob Jarratt ; General > Discussion: On-Topic and Off-Topic Posts > Subject: RE: Testing H745 Regulators > > Any chance you have a second supply you can parallel with the

RE: Testing H745 Regulators

et on both 73 Eugene W2HX Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos -Original Message- From: cctalk On Behalf Of Rob Jarratt via cctalk Sent: Wednesday, January 26, 2022 6:42 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: Testing

Testing H745 Regulators

I am trying to test a couple of H745 regulators with a DC bench PSU and I am having some problems with testing them. My bench PSU is a twin unit so I can supply the +15V required as well as the "AC" input using 20VDC from the other half of the bench PSU. The problem is that I don&#

Testing the H745 Regulator

I am going to be moving on to testing some H745 regulators. If I understand the schematic correctly the +15V input is the reference voltage used to regulate the -15V output, is that correct? If so, then presumably it doesn't need a whole lot of current, is that right? Thanks Rob

RE: Testing a H744 Regulator on The Bench

Subject: Re: Testing a H744 Regulator on The Bench Den tors 30 dec. 2021 kl 19:08 skrev Rob Jarratt via cctalk mailto:cctalk@classiccmp.org> >: Hello All, Following a discussion on resurrecting a PDP 11/45 I have started looking at the regulator bricks in the PSU. I have started

Re: Testing a H744 Regulator on The Bench

On 12/30/2021 10:08 AM, Rob Jarratt via cctalk wrote: Also, the indicator light does not work (as expected). I have seen the suggestion to replace it with a CM7381. It looks like these can be sourced with relative ease, b

Re: Testing a H744 Regulator on The Bench

Sounds like you're testing things basically the way I was: http://www.glitchwrks.com/2019/06/05/pdp1110-psu-repair I used a large Stancor 24 VAC transformer to supply power to the modules, since they usually see 20-30 VAC from the big transformer in the chassis. For dummy loads, I

Re: Testing a H744 Regulator on The Bench

lub to repair a bunch of them. Most common fault was the rectifier bridge. One had blown in the most spectacular way. The metalhousing was gone completely. One connector element in the AC in had fused off. I used 30VAC input and a 0.4 ohm load resistor when testing. I have a 0.2 ohm but my variac is

Testing a H744 Regulator on The Bench

Hello All, Following a discussion on resurrecting a PDP 11/45 I have started looking at the regulator bricks in the PSU. I have started with a H744. I reformed the three big capacitors, although they seemed to be fine as they charged up from my DC bench PSU and then had zero leakage so I didn't

RE: PBX (or something) for modem testing

1 AM To: cctalk@classiccmp.org Subject: Re: PBX (or something) for modem testing On 12/4/2019 7:47 PM, David Kuder via cctalk wrote: > If you go the Pi route, a ADIT600 is a good option. Get one with three > FXS 8C cards and a VOIP Router card. This works great for upto 28.8 / > 33.6 from m

Re: PBX (or something) for modem testing

On 12/4/2019 7:47 PM, David Kuder via cctalk wrote: If you go the Pi route, a ADIT600 is a good option. Get one with three FXS 8C cards and a VOIP Router card. This works great for upto 28.8 / 33.6 from my experience. Been reading up on all the units.  On this one: Do you have to have a VOIP c

Re: PBX (or something) for modem testing

If you go the Pi route, a ADIT600 is a good option. Get one with three FXS 8C cards and a VOIP Router card. This works great for upto 28.8 / 33.6 from my experience. -DK On Wed, Dec 4, 2019, 10:37 AM fozztexx--- via cctalk wrote: > > > On Dec 3, 2019, at 8:35 PM, Jim Brain via cctalk > wrote:

Re: PBX (or something) for modem testing

On 12/4/19 7:01 PM, Chris Osborn via cctalk wrote: https://www.insentricity.com/a.cl/230/using-modems-without-phone-lines Thank you for the link to the write up. I'm glad to learn that you're getting close to the 33.6, what I understand to be the pure analog maximum. I guess that since you'

Re: PBX (or something) for modem testing

On Dec 4, 2019, at 12:07 PM, Grant Taylor via cctalk wrote: > What sort of connection speeds are you getting? > > What codec(s) are you using? ulaw / alaw / something else? https://www.insentricity.com/a.cl/230/using-modems-without-phone-lines -- Follow me on twitter: @FozzTexx Check out

RE: PBX (or something) for modem testing

Jim, FWIW: Last time I had company money to deal with this issue I bought a similar model of this: A Viking DLE-200 https://www.amazon.com/Viking-DLE-200B-Two-Way-Line-Simulator/dp/B004PXK314 Dave. Sent from Mail for Windows 10 Message: 18 Date: Tue, 3 Dec 2019 22:35:40 -0600 From: Ji

Re: PBX (or something) for modem testing

On 12/4/19 8:37 AM, fozztexx--- via cctalk wrote: I recommend building an Asterisk PBX using either a junker PC or a Raspberry Pi. What sort of connection speeds are you getting? What codec(s) are you using? ulaw / alaw / something else? What protocol(s) are you using? SIP / IAX / SCCP (a.k

Re: PBX (or something) for modem testing

Whats wrong with DIGI-PULSE __ On 4/12/2019, 11:37 PM, "cctalk on behalf of fozztexx--- via cctalk" wrote: On Dec 3, 2019, at 8:35 PM, Jim Brain via cctalk wrote: > So, any ideas (or links to eBay auctions) of brands/models/etc. I should focus on? I recomm

Re: PBX (or something) for modem testing

On Wed, Dec 4, 2019 at 12:26 AM Glen Slick via cctalk wrote: > When I worked in a group that was doing modem related software over 20 > years ago two of the telephone line simulators we used were from > Teltone and from TAS. > > You can find Teltone TLS-2, 3, 4, and 5 boxes on eBay. The TLS-2 and

Re: PBX (or something) for modem testing

On Dec 3, 2019, at 8:35 PM, Jim Brain via cctalk wrote: > So, any ideas (or links to eBay auctions) of brands/models/etc. I should > focus on? I recommend building an Asterisk PBX using either a junker PC or a Raspberry Pi. If you use a PC then you can get a cheap/clone TDM400P PCI card and

Re: PBX (or something) for modem testing

On Tue, Dec 3, 2019 at 8:35 PM Jim Brain via cctalk wrote: > > That said, I went out to eBay to see if I could source a 2-8 line > something to help, and got smacked around with my lack of telephone > system knowledge. > > So, any ideas (or links to eBay auctions) of brands/models/etc. I should >

Re: PBX (or something) for modem testing

On 12/3/19 9:35 PM, Jim Brain via cctalk wrote: So, any ideas (or links to eBay auctions) of brands/models/etc. I should focus on? I would purchase a Partner system from AT&T / Lucent / Avaya. I think they are both analog and digital. The analog will work for modems. You will likely need a

PBX (or something) for modem testing

To continue validating modem functionality, I think it makes sense to set up a closed loop phone system in my lab that will function well enough to allow modems to connect to each other (dial tone, ringing, busy signal, etc.). I know I can probably whip something up with a 9 v battery and a pi

Re: Info on testing vintage power supplies

On 9/2/19 9:56 AM, Tony Duell wrote: On Mon, Sep 2, 2019 at 5:35 PM Alan Perry via cctech wrote: Can anyone here provide a pointer to info on testing vintage power supplies? Search results on the web may eventually lead to the kind of info that I am looking for, but I have to get through

Re: Info on testing vintage power supplies

On 2019-Sep-02, at 9:35 AM, Alan Perry via cctech wrote: > Can anyone here provide a pointer to info on testing vintage power supplies? > Search results on the web may eventually lead to the kind of info that I am > looking for, but I have to get through too many pages of modern

Re: Info on testing vintage power supplies

On Mon, Sep 2, 2019 at 5:35 PM Alan Perry via cctech wrote: > > > Can anyone here provide a pointer to info on testing vintage power > supplies? Search results on the web may eventually lead to the kind of > info that I am looking for, but I have to get through too many pages of &g

Info on testing vintage power supplies

Can anyone here provide a pointer to info on testing vintage power supplies? Search results on the web may eventually lead to the kind of info that I am looking for, but I have to get through too many pages of modern PC power supplies first. Specifically, I will be testing the power

Testing...

...cctalk digest mark as read. -- Grant. . . . unix || die

Re: Avoiding Shorts While Testing a DIN Plug

I'm with Fred on this one. Get a socket, solder some pigtails to it and use that, if you're worried. I'd definitely do that if the plug were a mini-DIN. Standard DIN, not so much. Just use a smaller probe with only the tip exposed through a bit of "spaghetti". --Chuck

Re: Avoiding Shorts While Testing a DIN Plug

On 2017-Aug-07, at 3:43 PM, James Hamilton via cctech wrote: > Hello all, > > Is there any good advice on avoiding shorts while testing a male DIN plug > with a multimeter? I'm trying to test my C64 power supply, but I'm very > nervous about accidentally shorting it i

Avoiding Shorts While Testing a DIN Plug

Hello all, Is there any good advice on avoiding shorts while testing a male DIN plug with a multimeter? I'm trying to test my C64 power supply, but I'm very nervous about accidentally shorting it in the process. Thanks! James Hamilton -- ~James

Re: Avoiding Shorts While Testing a DIN Plug

On Mon, 7 Aug 2017, James Hamilton via cctech wrote: Is there any good advice on avoiding shorts while testing a male DIN plug with a multimeter? I'm trying to test my C64 power supply, but I'm very nervous about accidentally shorting it in the process. use a DIN socket, maybe

Re: 8085 RAM testing program

On 13 February 2017 at 14:18, dwight wrote: > ook up March C. > > It is one of the most simple but thorough RAM test. It is > > the test most commonly used by manufactures. > > It only needs one address counter and unlike other > > is fast. > > The coding is simple > Cheers Dwight! -- adrian/

Re: 8085 RAM testing program

: Monday, February 13, 2017 3:03 AM To: Discussion: On-Topic and Off-Topic Posts Subject: 8085 RAM testing program Hi folks, I'm at the point of troubleshooting this 8085 board where I need to test all the RAM. The code loops at an IN looking forsomething. Based on other assembly programs

8085 RAM testing program

Hi folks, I'm at the point of troubleshooting this 8085 board where I need to test all the RAM. The code loops at an IN looking forsomething. Based on other assembly programs I've looked at the code is very similar to eg a disk controller looking for a READY signal from a drive. Trouble is I

Re: Testing bus transceivers

tems - RK11, RP11, etc - and we wanted to assure a goodly supply of our selected transceiver chip before we spin out a PC board.) > If it's something like a dozen, manual testing will be practical. If > it's something like a hundred, then automating the testing might be a

Re: Testing bus transceivers

Do you have any sort of precision, regulated, adjustable lab bench power supply that you could use to vary input voltage? If not, using a potentiometer as you mentioned would also work. Also, how many of these did you buy? If it's something like a dozen, manual testing will be practica

Re: Testing bus transceivers

-fu is pretty weak - so details would be most greatly appreciated! ;-) A number of data books have circuits that were used to measure the parameters (including rise/fall times) so you might want to look at some of them (substituting values for the 8641 vs the part in the data book). They all look

Testing bus transceivers

So, I have bought a number of DS8641 bus transceivers from a source in China, and cognizant of the claims that there are a lot of counterfeits coming from China, how can I test them to make sure the meet specs? I have a QBUS test board which I have constructed (it's basically just a single read/wr

RE: Testing H7864 (MicroVAX II) PSU With No Load

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Robert > Jarratt > Sent: 02 November 2015 23:18 > To: 'General Discussion: On-Topic and Off-Topic Posts' > Subject: RE: Testing H7864 (MicroVAX II) PSU With No Load

RE: Testing H7864 (MicroVAX II) PSU With No Load

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Mattis Lind > Sent: 02 November 2015 21:44 > To: General Discussion: On-Topic and Off-Topic Posts > Subject: Re: Testing H7864 (MicroVAX II) PSU With No Load > > 2015-11-02 2

Re: Testing H7864 (MicroVAX II) PSU With No Load

2015-11-02 22:05 GMT+01:00 Robert Jarratt : > > > > I have just uploaded all the corrections. So the connector names on the > risers should now correspond. I have also corrected the area on the primary > control module around C403 and R407. > > Regards > > Rob > > Checked the new one. There are st

RE: Testing H7864 (MicroVAX II) PSU With No Load

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Robert > Jarratt > Sent: 02 November 2015 20:36 > To: 'General Discussion: On-Topic and Off-Topic Posts' > Subject: RE: Testing H7864 (MicroVAX II) PSU With No Load >

RE: Testing H7864 (MicroVAX II) PSU With No Load

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Mattis Lind > Sent: 02 November 2015 13:20 > To: General Discussion: On-Topic and Off-Topic Posts > Subject: Re: Testing H7864 (MicroVAX II) PSU With No Load > > 2015-11-01 1

Re: Testing H7864 (MicroVAX II) PSU With No Load

2015-11-01 17:35 GMT+01:00 Robert Jarratt : > > > > > > Maybe you can publish your schematic somwhere. It is much easier to > > > > come > > > up > > > > with ideas to pin point problems if we all view the same schematic. > > > > I > > > think it > > > > would be possible to identify the problem w

RE: Testing H7864 (MicroVAX II) PSU With No Load

> > Then you've not come across the ones in TK50Z desktop cases (and a few > other things). They don't like operating without a minimum load, No, probably not. Actually I may have one somewhere, but have never had to repair it, so have never run it without a load. Thanks for the warning though!

Re: Testing H7864 (MicroVAX II) PSU With No Load

On 01/11/2015 18:47, tony duell wrote: I've yet to find a DEC PSU that fails destructively if not loaded, it is more likely to just trip the overvoltaeg protection crowbar, shut down, then try to restart and repeat the cycle, tweeting as it goes Then you've not come across the ones in TK50Z des

RE: Testing H7864 (MicroVAX II) PSU With No Load

[Chopper transistor] > This one is a D905. I assume that's a 2SD905 (the '2S' is often left off the package). From the data I've seen that certainly could be used as a chopper transistor. -tony

RE: Testing H7864 (MicroVAX II) PSU With No Load

> > You mentioned DEC PSUs, this one is actually made by ASTEC. I will use a Firstly, every Astec PSU I've seen has been a swticher. They probably did make linear PSUs, but not common... Secodnly, it may have been made to a DEC design (rather than just a specification). I believe you replace

RE: Testing H7864 (MicroVAX II) PSU With No Load

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of tony duell > Sent: 01 November 2015 18:54 > To: General Discussion: On-Topic and Off-Topic Posts > Subject: RE: Testing H7864 (MicroVAX II) PSU With No Load > > > > Th

RE: Testing H7864 (MicroVAX II) PSU With No Load

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of tony duell > Sent: 01 November 2015 18:47 > To: General Discussion: On-Topic and Off-Topic Posts > Subject: RE: Testing H7864 (MicroVAX II) PSU With No Load > > > > >

RE: Testing H7864 (MicroVAX II) PSU With No Load

> That said, it's possible that there may be an auxiliary linear regulator in > there. That's common > for additional outputs with modest current needs, especially in older > designs where the > switching circuitry takes a lot of individual components. A TO-3 can isn't > what I would expect

RE: Testing H7864 (MicroVAX II) PSU With No Load

crowbar, shut down, then try to restart and repeat the cycle, tweeting as it goes > If it has a laminated iron transformer, big electrolytics for filtering, and > transistors at the > secondary side, it's probably a linear regulator supply. Those don't need a > load. Y

Re: Testing H7864 (MicroVAX II) PSU With No Load

> On Nov 1, 2015, at 12:37 PM, Robert Jarratt > wrote: > > ... > Hmmm Until your email I was pretty confident this was a switcher. But > your description of a linear PSU seems to fit. I have posted three photos of > the main board here: http://1drv.ms/1KQkTBp can you tell from that what kin

Re: Testing H7864 (MicroVAX II) PSU With No Load

its a switcher. On 11/1/2015 10:37 AM, Robert Jarratt wrote: > >> -Original Message- >> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Paul > Koning >> Sent: 01 November 2015 16:52 >> To: General Discussion: On-Topic and Off-Topic Posts

RE: Testing H7864 (MicroVAX II) PSU With No Load

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Paul Koning > Sent: 01 November 2015 16:52 > To: General Discussion: On-Topic and Off-Topic Posts > Subject: Re: Testing H7864 (MicroVAX II) PSU With No Load > > > >

Re: Testing H7864 (MicroVAX II) PSU With No Load

gt; one, probing each one side by side, to see up to where it appears to be > working. It would be awkward to have two dummy loads, just for lack of > suitable equipment. Does anyone know if it is safe to run these PSUs with no > load? Would my testing be valid without a load? If

RE: Testing H7864 (MicroVAX II) PSU With No Load

> > > Maybe you can publish your schematic somwhere. It is much easier to > > > come > > up > > > with ideas to pin point problems if we all view the same schematic. > > > I > > think it > > > would be possible to identify the problem without comparing the two > > > PSUs > > at > > > least in thi

Re: Testing H7864 (MicroVAX II) PSU With No Load

2015-11-01 15:04 GMT+01:00 Robert Jarratt : > > > > -Original Message- > > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Mattis > Lind > > Sent: 01 November 2015 12:46 > > To: General Discussion: On-Topic and Off-Topic Posts > >

RE: Testing H7864 (MicroVAX II) PSU With No Load

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Mattis Lind > Sent: 01 November 2015 12:46 > To: General Discussion: On-Topic and Off-Topic Posts > Subject: Re: Testing H7864 (MicroVAX II) PSU With No Load > > söndag 1 novem

Re: Testing H7864 (MicroVAX II) PSU With No Load

side by side, to see up to where it appears to be > working. It would be awkward to have two dummy loads, just for lack of > suitable equipment. Does anyone know if it is safe to run these PSUs with > no > load? Would my testing be valid without a load? > > > Maybe you can publ

Testing H7864 (MicroVAX II) PSU With No Load

loads, just for lack of suitable equipment. Does anyone know if it is safe to run these PSUs with no load? Would my testing be valid without a load? Thanks Rob

Re: testing...

hmm. strange.. this seems to work. thanks for ignoring this. simon On 26-10-15 08:47, simon wrote: Please ignore. it seems my mail does not get through the last couple of times. -- Met vriendelijke Groet, Simon Claessen drukknop.nl

testing...

Please ignore. it seems my mail does not get through the last couple of times. -- Met vriendelijke Groet, Simon Claessen drukknop.nl

RE: Testing floppy drives

> I don't know if the guys at Accurite still have Drive Probe (a similar > product to AlignIt) in stock, but they seem to still be selling it: > > http://www.accurite.com/DriveProbe.html > I can tell you from experience that they do NOT. Basically, when you call them if they don't have it they f

Re: Testing floppy drives

. All of them with single/double sided floppy drives, and the whole nine yards. Since it is not pratical to test all these drives on CP500, is there a good software solution I can use on a PC for floppy drive testing? Something that makes repairing easier? Long time I don't get so many dr

RE: Testing floppy drives

> You can normally do BETTER and more accurate alignment using an analog > alignment diskette (+ 20MHz dual trace scope), but I think that the > digital is "close enough". That is what was nice about the Microtest. It used the _analogue_ alignment disk but took the place of the 'scope and drive ex

Re: Testing floppy drives

test all these drives on CP500, is there a good software solution I can use on a PC for floppy drive testing? Something that makes repairing easier? Long time I don't get so many drives to repair/refurbish/align Personally, I would use Dysan Digital Diagnostic Diskette. There were a

RE: Testing floppy drives

> Since it is not pratical to test all these drives on CP500, is there a > good software solution I can use on a PC for floppy drive testing? Something > that makes repairing easier? Long time I don't get so many drives to > repair/refurbish/align IMHO the ultimate PC dr

Testing floppy drives

ere a good software solution I can use on a PC for floppy drive testing? Something that makes repairing easier? Long time I don't get so many drives to repair/refurbish/align Thanks Alexandre --- Enviado do meu Apple IIGS (pq eu sou chique) Meu site: http://www.tabalabs.com.br Meu

Re: DOS Frotz testing request

This was mainly a fun project using one of our products at work as a mental exercise. It never actually shipped in production code. It was for a DSLAM (used to provide DSL internet service). Geoff On May 19, 2015, at 1:51 AM, d...@661.org wrote: > On Mon, 18 May 2015, Geoff Oltmans wrote: >

Re: DOS Frotz testing request

David Griffith wrote: On Tue, 19 May 2015, Peter Coghlan wrote: > David Griffith wrote: [snip] > > None of the compiles produced any errors or informational messages - > there were just two warnings for pointer mismatches due to signed versus > unsigned chars in dumb_input.c. > > I'd say