Re: Advice requested on proper disposal of Seagate ST3000DM001 disk drives
I find it enjoyable to disassemble the drives that I want to dispose of. I take all of the metal bits and throw them in my scrap metal recycling bin. I throw the boards in my electronics/e-waste recycling bin. I used to keep the magnets, but I have a pretty good magnet collection now and, with newer drives, it is too much work to remove the magnets from the parts they are bonded to. alan On 9/20/18 9:39 PM, Alexandre Souza via cctalk wrote: Have you heard about a pointy hammer? :) 2018-09-21 0:37 GMT-03:00 drlegendre via cctalk : If you're that intent on firey destruction, it would be much simpler & safer to use an oxyacetylene cutting torch, or a plasma cutter. On Thu, Sep 20, 2018, 10:20 PM Eric Smith via cctalk < cctalk@classiccmp.org> wrote: Anyone have advice on making thermite? Ingredients, sources, proportions? The internet seems to think that just using aluminum powder with ferric oxide is relatively hard to ignite, and that some manganese dioxide would help with that. Without spending too much time shopping, it looks like I can get: * aluminum powder, 5 micron, 2 lb for $34 * ferric oxide, 10 lb for $27 * manganese dioxide, 1 lb for $39
In search of microchannel P390 card...
If you have a lead on one, please ping me off-list. I have a very specific project I'm trying to accomplish. thanks
Re: Floating point math in FORTRAN IV on PDP-8
My SIMH resists anything but Adventure, I am working through a Fortran IV. I
think you break from the loop and confuse the machine using i. That with some
error checking:
.TYPE FLOAT.FT
DO 50 X=1,100
F = FLOAT(X)
G = SQRT(F)
IF (G) (11,11,90)
11 WRITE(4,75) G
75 FORMAT(H 5,ERROR)
90 H = ALOG(F)
WRITE(4,99) F,G,H
99 FORMAT(' ',E12.6,E12.6,E12.6)
50 CONTINUE
WRITE(4,100) F,G,H
100 FORMAT(' ',E12.6,E12.6,E12.6)
END
My for fortran IV book and I are the same age,LoL
Jonathan Engwall
engwalljonathanther...@gmail.com
On September 19, 2018, at 11:10 PM, mark--- via cctalk
wrote:
Hi Kyle
Just out of interest I ran this on VAX Fortran (Compaq Fortran 77 6.6-201) and
I think got the results expected:
$ type for004.dat
1.001.000.00
2.001.4142140.693147
3.001.7320511.098612
4.002.001.386294
5.002.2360681.609438
...
98.009.8994954.584968
99.009.9498744.595120
100.00 10.004.605170
However, I am no Fortran expert!
Regards, Mark.
-Original Message-
From: cctalk On Behalf Of Kyle Owen via cctalk
Sent: Wednesday, September 19, 2018 11:44 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Floating point math in FORTRAN IV on PDP-8
At VCF MW this past weekend, I was playing around with an FPP8/A stuffed into a
PDP-8/M with a fan removed. This hex-wide two-board set will happily work in a
quad-wide backplane, as it needs no signals that an 8/A would otherwise provide.
I wanted to benchmark the FPP8/A with the software emulation that FORTRAN IV
supposedly does. Mind you, I also don't have an EAE in mine, so software
emulation for integer multiplication/division would also be used.
I tried running a simple program to print some natural logs and square roots,
which ran quite well with the FPP8/A in place.
Without the FPP8/A...all of the results were wrong. Significantly. Negative
numbers in many cases. No clear pattern as to what it's doing.
Would anyone be able to try my program on some other real hardware (or another
emulator) to verify? With and without EAE would also be desirable.
I'm not sure how to disable the EAE in SIMH, else I'd try that too.
Here's what SIMH looks like with my program:
PDP-8 simulator V4.0-0 Currentgit commit id: d35b8725
sim> at rk0 disk2.fortran.rk05
sim> b rk
.TYPE FLOAT.FT
DO 50 I=1,100
F = FLOAT(I)
G = SQRT(F)
H = ALOG(F)
WRITE(4,100) F,G,H
50CONTINUE
100 FORMAT(' ',F12.6,F12.6,F12.6)
END
.R F4
*FLOAT/G$
1.021.020.00
2.021.4142150.693147
3.021.7320531.098614
4.022.021.386296
5.022.2360701.609439
[snip]
98.019.8994954.584968
99.009.9498744.595121
100.23 10.084.605171
.
Much appreciated,
Kyle
Re: Advice requested on proper disposal of Seagate ST3000DM001 disk drives
Have you heard about a pointy hammer? :) 2018-09-21 0:37 GMT-03:00 drlegendre via cctalk : > If you're that intent on firey destruction, it would be much simpler & > safer to use an oxyacetylene cutting torch, or a plasma cutter. > > On Thu, Sep 20, 2018, 10:20 PM Eric Smith via cctalk < > cctalk@classiccmp.org> > wrote: > > > Anyone have advice on making thermite? Ingredients, sources, proportions? > > > > The internet seems to think that just using aluminum powder with ferric > > oxide is relatively hard to ignite, and that some manganese dioxide would > > help with that. > > > > Without spending too much time shopping, it looks like I can get: > > * aluminum powder, 5 micron, 2 lb for $34 > > * ferric oxide, 10 lb for $27 > > * manganese dioxide, 1 lb for $39 > > >
HP CPU32 Emulation Adapter
Hello everyone, This is a longshot, but I was wondering if anybody has or knows someone who might have a very specific HP part. It's the HP E3417A, a PQFP132 PGA interposer for some HP emulation/debug preprocessor stuff for CPU32 (among other 132 pin QFP). Basically I came into an HP logic analyzer with a full preprocessor setup for 160 pin QFP CPU32 procs. 16700A with emulator option, E2480A preprocessor for CPU32, and a 160 pin QFP elastomeric socket with the flex cable. But, I've got one of these: https://hackaday.io/project/6150-beckman-du600-reverse-engineering That board has a 132 pin QFP, but with the right adapter, it should be supported by the hardware I've got here. Thanks, Joe Zatarski
Re: Advice requested on proper disposal of Seagate ST3000DM001 disk drives
If you're that intent on firey destruction, it would be much simpler & safer to use an oxyacetylene cutting torch, or a plasma cutter. On Thu, Sep 20, 2018, 10:20 PM Eric Smith via cctalk wrote: > Anyone have advice on making thermite? Ingredients, sources, proportions? > > The internet seems to think that just using aluminum powder with ferric > oxide is relatively hard to ignite, and that some manganese dioxide would > help with that. > > Without spending too much time shopping, it looks like I can get: > * aluminum powder, 5 micron, 2 lb for $34 > * ferric oxide, 10 lb for $27 > * manganese dioxide, 1 lb for $39 >
Re: Advice requested on proper disposal of Seagate ST3000DM001 disk drives
On 09/20/2018 08:20 PM, Eric Smith via cctalk wrote: > Anyone have advice on making thermite? Ingredients, sources, proportions? > > The internet seems to think that just using aluminum powder with ferric > oxide is relatively hard to ignite, and that some manganese dioxide would > help with that. > > Without spending too much time shopping, it looks like I can get: > * aluminum powder, 5 micron, 2 lb for $34 > * ferric oxide, 10 lb for $27 > * manganese dioxide, 1 lb for $39 I'd just give the drive to my friend with a big chipper "hog" and watch the destruction. Maybe run over it with his D8 Cat a few times. A good hydraulic press should help. Or just melt the thing down in a forge. --Chuck
Advice requested on proper disposal of Seagate ST3000DM001 disk drives
Anyone have advice on making thermite? Ingredients, sources, proportions? The internet seems to think that just using aluminum powder with ferric oxide is relatively hard to ignite, and that some manganese dioxide would help with that. Without spending too much time shopping, it looks like I can get: * aluminum powder, 5 micron, 2 lb for $34 * ferric oxide, 10 lb for $27 * manganese dioxide, 1 lb for $39
Re: ISO 70's and 80's coax and twinax terminal docs/brochures
On 9/20/18 3:10 AM, Evan Linwood via cctalk wrote: I've started to more aggressively archive material on old IBM and compatible coax and twinax I'm not sure if this helps - they seem like they may be in the disposal chain though, might possibly be able to grab manuals if they come up? http://www.a1usedcomputers.com.au/shop/prodList.asp?idCategory=256 That would be good, A1 seems to have a lot of the more recent stuff listed. I haven't pursued anything with them since they are in Australia. The other thing I've not been able to turn up so far are the part numbers for the keyboards that go with third-party terminals, and what their key layout is. With the exception of the one Microswitch Telex keyboard Cindy found, there is very little documented on 70-80's non-IBM keyboards. I would imagine there are still piles of them from the 90's out there, and maybe the kb collectors haven't picked over them yet because they don't know what they are. While not period correct, at least the less collectable 88 and 122 key rubber dome or foam and foil ones have the correct key layout.
Re: ISO 70's and 80's coax and twinax terminal docs/brochures
> I've started to more aggressively archive material on old IBM and compatible > coax and twinax I'm not sure if this helps - they seem like they may be in the disposal chain though, might possibly be able to grab manuals if they come up? http://www.a1usedcomputers.com.au/shop/prodList.asp?idCategory=256
Re: Looking for two DEC H445 power bricks for PDP 11/40 project
I also saw some notes about different wiring harnesses for different serial numbers. A lot to be careful with. On Thu, Sep 20, 2018 at 1:22 AM, Paul Anderson wrote: > I grabbed a 11/60, 11/35 system manual. wanting to see hot power was set > up in the BA11-D and -K, only to find it dealt with the BA11-F only. > > It does state the H754 in used with the MF11-U/UP. needless to say, there > are different plugs for slot "E" and possibly a change or a jumper. > > I will look for a 11/35 book specifically next time I go downstairs. > > My 11/40 does have 2 H745s in it. I see no reason to use both at this > point. I think one can supply enough current unless you overload it with a > bunch of 8K core. > > I plan on putting either 8 16K core stacks in(for winter only) or an > MS11-LD (256KB). > > Pierre, a lot of my bricks are buried. I'll try to did them out tomorrow. > > Thanks, Paul > > On Wed, Sep 19, 2018 at 4:09 PM, Eric Smith via cctalk < > cctalk@classiccmp.org> wrote: > >> On Tue, Sep 18, 2018 at 8:27 AM, Noel Chiappa via cctalk < >> cctalk@classiccmp.org> wrote: >> >> > (Note that if you have an old >> > machine/harness, there's a jumper you have to add if you have only a >> single >> > H745; see the second paragraph on page 6-18 of DEC-11-H40SA-B-D.) >> > >> >> I totally missed that. It wasn't in the previous edition, >> DEC-11-H40SA-A-D. >> >> However, now I see that both editions mention that the H744 in slot C is >> optional, which I also was not previously aware of. >> >> Although I've had a few 11/40 machines, I didn't often have to do anything >> about the power supplies other than check the DC voltage and ripple. >> > >
Re: Looking for two DEC H445 power bricks for PDP 11/40 project
I grabbed a 11/60, 11/35 system manual. wanting to see hot power was set up in the BA11-D and -K, only to find it dealt with the BA11-F only. It does state the H754 in used with the MF11-U/UP. needless to say, there are different plugs for slot "E" and possibly a change or a jumper. I will look for a 11/35 book specifically next time I go downstairs. My 11/40 does have 2 H745s in it. I see no reason to use both at this point. I think one can supply enough current unless you overload it with a bunch of 8K core. I plan on putting either 8 16K core stacks in(for winter only) or an MS11-LD (256KB). Pierre, a lot of my bricks are buried. I'll try to did them out tomorrow. Thanks, Paul On Wed, Sep 19, 2018 at 4:09 PM, Eric Smith via cctalk < cctalk@classiccmp.org> wrote: > On Tue, Sep 18, 2018 at 8:27 AM, Noel Chiappa via cctalk < > cctalk@classiccmp.org> wrote: > > > (Note that if you have an old > > machine/harness, there's a jumper you have to add if you have only a > single > > H745; see the second paragraph on page 6-18 of DEC-11-H40SA-B-D.) > > > > I totally missed that. It wasn't in the previous edition, DEC-11-H40SA-A-D. > > However, now I see that both editions mention that the H744 in slot C is > optional, which I also was not previously aware of. > > Although I've had a few 11/40 machines, I didn't often have to do anything > about the power supplies other than check the DC voltage and ripple. >
