test-drb June 2004

test-drb@ccmp.vtda.org

281 participants
616 discussions

manuals in pdf (resolution, compression)

by pete＠dunnington.u-net.com

On Jun 27, 13:59, Tom Owad wrote: > What I'm leaning towards now is making two sets: one for archiving and > one for distribution. > > The archival images will be 600dpi greyscale TIFFs. They will not be > converted to pdf, but just stored as TIFFs. > > The images intended for download and distribution will be 200dpi > greyscale JPEGs. Using these, I expect a 128-page download to be about > 20 MB. While perhaps not suitable for ocr, these images are very > comfortable to read on-screen, and can later be replaced with improved > versions made from the original 600dpi TIFFs. > > I know a lot of you expressed concerns about JPEGs, but I haven't been > able to get anywhere near the compression using other methods, for > greyscale images. Am I overlooking any options? JPEGs are bad news because of the losses. Personally I find higher-resolution easier to read (and print, if I want to, which I often do) and normally greyscale isn't needed. The last thing I scanned was a 166-page DEC manual, which came out as 6.4MB of PDF or 6.3MB of G4 TIFFs in a single TIFF file. That's a lot better than your 20MB JPEG, and higher resolution, too. -- Pete Peter Turnbull Network Manager University of York

20 years, 5 months

local finds

by jack.rubin＠ameritech.net

Found these in Chicago: Vax 4000-300 Dec R400X TU-81 Plus Free for pickup - will not ship. They are on hold for a week before "demanufacturing". Let me know if anyone is interested; I don't have any more info than the name tags; devices appear to be in good cosmetic condition. Jack

20 years, 5 months

m9312 roms

by pete＠dunnington.u-net.com

On Jun 27, 8:13, <pzachary(a)sasquatch.com> wrote: > > I have several roms and a reader, what format would be the most portable? If you mean file format, probably Intel HEX files. I usually use binary for ROM images, but those ROMs are small so it's not really an issue. More programmers handle Intel HEX than S-records (though some handle both, and there are various utilities on the net, including mine, to convert between them). If you mean data layout in the file, remember those ROMs are 4-bit wide. A lot of programmers only use one half of each byte in the file. Mine happens to use the lower 4 bits, but I believe some may use the upper 4 bits. It might be worth copying whichever 4 bits your programmer provides into the other four (ie if the data in one 4-bit word is binary 1011, and the programmer creates a file with byte value 00001011 for that word, turn it into 10111011). You'll end up with a file that's 512x8 instead of 512x4, of course, but you would anyway, as that's what most programmers use for such devices. -- Pete Peter Turnbull Network Manager University of York

20 years, 5 months

VCFe (trades)

by cb＠mythtech.net

>> Apple IIgs Second Sight Video Card > >What does this do for the IIgs? Gives it ESP so you can see tomorrow's lottery numbers (or was that the 'Third Eye' card?) -chris <http://www.mythtech.net>

20 years, 5 months

Mount disk images for MS-DOS

by cfnelson_87111＠yahoo.com

I know there are lots of utility programs that can create image files of floppy disks for MS-DOS. Instead of having to write the image file back to a physical floppy disk, are there any programs that can "mount" disk images to make it appear to MS-DOS as if the original floppy disk is in a drive? As an example of what I am looking for, "Disk Copy 6.x" can do this for the Macintosh. - Curt __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

20 years, 5 months

Rejuvinating Lead/Acid Batterys, was Re: HP-110 Plus laptop power supply specs?

by dwight.elvey＠amd.com

Hi Marvin Most gel cells are damaged from overcharging and not sulfating( no more water inside ). Most cases of sulfating can be recovered with a slow, low current charge. You need to have just enough current to overcome the normal leakage but not enough to generate excess gas. I've not seen, personally, enough difference between these types of battery rejuvenators and just using a trickle current to justify there purchase. About 5 years ago, we took two batteries that did not recover after a trickle charge. Neither of the two recovered after using a device, similar to the one described with high frequency pulses. All the other batteries recovered. These were auto sized and we used a current of 200ma. Dwight >From: "Marvin Johnston" <marvin(a)rain.org> > > >I just found out about a new type of battery charger called the >BatteryMinder that will (it is claimed) rejuvenate Lead/Acid batteries >that are dead due to sulphating. A friend of mine used one on a battery >that had been totally discharged for too long, and was able to recover >it. He sent me a 12v one and I am looking around for some batteries to >try it out ... like a couple of dozen Sharp PC-5000 lead/acid batteries >:). If this works on *old* lead acid batteries, I will be one happy >camper :)! > >If anyone is curious, their web site is at: >http://www.vdcelectronics.com/batteryminder.htm > >"Joe R." wrote: > >> >> The batteries in the PP and PP+ are a pain. They're lead acid and they >> are individual cylinders. So if you let them run down for very long, it >> will ruin them and they're not an easy style to find. IIRC they're X size >> which is slightly larger than standard D size. >

20 years, 5 months

Floppy drive oddity? (TEC FB-503)

by dwight.elvey＠amd.com

>From: "Dwight K. Elvey" <dwight.elvey(a)amd.com> > >Hi > One other thought, check that the head positioning >system isn't sticking. > I also doubt that both drives have had some electronic >failure. >Dwight > > > Hi I also forgot to mention, I have one of those floppy drive exercisers. If you live in the San Jose/Santa Cruz Calif. area, we can get together and check out your drives. Dwight

20 years, 5 months

Mount disk images for MS-DOS

by trash3＠splab.cas.neu.edu

I think something similar would be Ghost Explorer. That lets you take a drive that has been "backed up" with Ghost (sorry, no floppy drives that I know of) and then treat the packed image file as a folder (under Windoze). I think you can also "zip" the files on the drive and then use an unzip program to browse. But it sure would be nice to take a file made by a true floppy image copy program (like floppy copy) and browse it, not just restore it to another floppy. Joe Heck

20 years, 5 months

Wanted: ASR-33, LA36, and VT50

by wacarder＠usit.net

I'm still looking for an ASR-33 teletype, an LA36 DecWriter, and a VT50 DecScope for my 1977-78 PDP-11/40 computer center "reincarnation" project. Does anyone on this list have any of these items that they would be interested in getting rid of? Also, another item that I need to make the project complete is an HP 7200A plotter. If anyone has any of these items and wants to get rid of them, please contact me off-list. Thanks, Ashley

20 years, 5 months

Dec VAX 4000/500 cluster rescue

by Mark＠Misty.com

Hi, I just rescued a Vax cluster, with two 4000/500 processors and a R400X enclosure with DSSI drives in it. I'm a newbie to VAXen, but ordered CDROM media for OpenVMS as a hobbiest. I also successfully fashioned a console cable. So far, if I boot from one disk, I get a $ prompt, but only with the "backup" command working, and if I boot from another I get tons of boot-up messages, but no console login prompt once the thing seems to be up. I'd like to find four DSSI terminators, so I can run one or the other processor, either with internal disks or the R400X, without having to have this set up as a cluster. I'm also looking for some other SCSI controller. The one in this system is the KZQSA, suitable for installing VMS from a CDROM, but incompatible with NetBSD, and apparently pathetically slow for SCSI hard drives under VMS. I have no idea where to find either of these items. If anyone has any suggestions, please let me know. Mark -- Mark G. Thomas (Mark(a)Misty.com) voice: 215-591-3695 http://www.misty.com/ http://mail-cleaner.com/

20 years, 5 months

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test-drb June 2004