Re: ISO Laserjet I/II/III firmware
On 8/12/21 4:16 PM, Zoltan HERPAI via cctalk wrote: Is there any interest in the firmware dumps for the JetDirect cards? I have no idea what sort of effort it would take to do so, much less how usable the dumps would be. That being said, I can see some value in a virtual JetDirect. Especially if it could emulate an older more capable JetDirect (multi-protocol) that could be used by something to translate to more contemporary printing methods; e.g. IPP. It might be an option for older virtual machines to be able to talk to and print to contemporary printers. -- Grant. . . . unix || die
Re: Early '80s Motorola Semiconductor Reference - anyone?
I have Motorola's "linear circuits" and "interface circuits" from 1979, but actual Semiconductor Data Books I only have are from 1969-1973. On Sun, Aug 8, 2021 at 9:34 AM James B DiGriz via cctalk < cctalk@classiccmp.org> wrote: > Not directly useful for part number interchange, but schematic and > mechanicals for the 3T series switching regulators here: > http://www.rknorman.co.uk/Boschert%20PSU%20Circuit%20diagram.pdf > > On Sun, 8 Aug 2021 04:26:30 -0700 > Al Kossow via cctalk wrote: > > > On 8/7/21 9:48 PM, r.stricklin via cctalk wrote: > > > > > Annoying, but I still appreciate the tip. I think I can get where I > > > need to go with the assorted Boschert manuals on Bitsavers, if I > > > put the effort into tracing mine out. > > > > Tony forwarded me some schematics which i've added to > > http://bitsavers.org/pdf/boschert > > > > the OL400 from the PERQ was a nice find since their 1980's higher > > wattage supplies are very hard to find information on > > > >
How do CRT's age?
Odd question, how well do CRT’s age? Just the CRT, if what I think exists, is actually there, they’ve never been in Oscilloscopes. Zane
Re: How do CRT's age?
I'm a bit confused by the wording. Is the question "how well do they age if not used"? I would say they should last pretty much indefinitely so long as the vacuum seal is correctly made and not cracked, and of course there is no other evidence of mechanical damage. paul > On Aug 13, 2021, at 2:43 PM, Zane Healy via cctalk > wrote: > > Odd question, how well do CRT’s age? Just the CRT, if what I think exists, > is actually there, they’ve never been in Oscilloscopes. > > Zane > >
Re: ISO Laserjet I/II/III firmware
On 8/13/21 7:00 PM, cctalk-requ...@classiccmp.org wrote: Message: 1 Date: Thu, 12 Aug 2021 13:10:43 -0400 From: Ethan Dicks To: Al Kossow, "General Discussion: On-Topic and Off-Topic Posts" Subject: Re: ISO Laserjet I/II/III firmware Message-ID: Content-Type: text/plain; charset="UTF-8" On Thu, Aug 12, 2021 at 10:48 AM Al Kossow via cctalk wrote: I suspect interest in emulating them will die out once they get past the 68000 models. I may still have a II, and I definitely still have at least one (functional) III and a 4Si I still use my 4M/L all the time - Postscript + LocalTalk + IEEE1284. It's a great little printer. -ethan I have a IIp+ that I got for $2 at a hamfest around 15 years ago... I have repaired it several times (most recently, visibly bad electrolytics in the switching PS startup circuit). In fact that's the second time the power supply has failed - the first time was years ago and I just replaced the board. Now it's crinkling the bottom of pages... there used to be a kit to fix that. I love those old "bricks". Although mine is like my grandfather's axe (new head and new handle but it's still my grandpa's axe) :) The trick nowadays is finding toner cartridges that weren't just refilled, but actually rebuilt (with a new wiper blade). -Charles
Re: How do CRT's age?
Really, that’s what I thought. The ones I’m thinking of, should still be in the packaging, assuming my Dad didn’t drill them out to make lamps (at which point they’re an art object). At some point, my Mom wants me to get into where they’re stored. Zane > On Aug 13, 2021, at 11:47 AM, Paul Koning wrote: > > I'm a bit confused by the wording. Is the question "how well do they age if > not used"? > > I would say they should last pretty much indefinitely so long as the vacuum > seal is correctly made and not cracked, and of course there is no other > evidence of mechanical damage. > > paul > >> On Aug 13, 2021, at 2:43 PM, Zane Healy via cctalk >> wrote: >> >> Odd question, how well do CRT’s age? Just the CRT, if what I think exists, >> is actually there, they’ve never been in Oscilloscopes. >> >> Zane >> >> >
Re: How do CRT's age?
I vaguely remember this being discussed eons ago wrt correct storage orientation to keep cathode shed from hitting the phosphor.
30 yrs. ago
30 years ago this month the IBM PC debuted at $1565. Some say this began the era of mass-computing and it is now what classiccmp.org is all about! For those interested in the OS world LINUX is 30 years old. Time has passed but this is what classic computing is all about. Happy computing. Murray 🙂
Re: 30 yrs. ago
On 8/13/21 6:14 PM, Murray McCullough via cctalk wrote: this began the era of mass-computing and it is now what classiccmp.org is all about wrong go play with the children on vogons or the VCF forum if you feel that way
Re: 30 yrs. ago
40* years ago? On Fri, Aug 13, 2021, 8:14 PM Murray McCullough via cctalk < cctalk@classiccmp.org> wrote: > 30 years ago this month the IBM PC debuted at $1565. Some say this began > the era of mass-computing and it is now what classiccmp.org > is all about! For those interested in the OS world > LINUX is 30 years old. Time has passed but this is what classic computing > is all about. > > > Happy computing. > > > Murray 🙂 >
Re: 30 yrs. ago
Linux actually turns 30 in a couple months. In January, I’ll have used it for 30 years. Zane Sent from my iPod > On Aug 13, 2021, at 6:14 PM, Murray McCullough via cctalk > wrote: > > 30 years ago this month the IBM PC debuted at $1565. Some say this began > the era of mass-computing and it is now what classiccmp.org > is all about! For those interested in the OS world > LINUX is 30 years old. Time has passed but this is what classic computing > is all about. > > > Happy computing. > > > Murray 🙂
Re: 30 yrs. ago
My apologies. 🙁 It was 40 years ago that the IBM PC became a retail computer this month. Murray 🙂
Re: 30 yrs. ago
On Fri, 13 Aug 2021, Murray McCullough via cctalk wrote: 30 years ago this month the IBM PC debuted at $1565. Some say this began the era of mass-computing and it is now what classiccmp.org is all about! For those interested in the OS world LINUX is 30 years old. Time has passed but this is what classic computing is all about. Happy computing. Murray August 11, 1981, NOT 1991 It has been 40 years. There were many of us who said that it was the END of the era. And that in a few years, more that half of the personal computers would be PC, or imitations thereof. It has never been what classiccmp.org is all about! -- Grumpy Ol' Fred ci...@xenosoft.com
Linearizing PDF scans
Is it still useful to linearize PDFs? I've been scanning and PDFing manuals for 16 years, and I've been linearizing them regularly. My understanding is that this made them accessible on a page-by-page basis in Web browsers without requiring a complete file download first. But given the increase in typical bandwidth in 16 years, I wonder if this is still useful. It is an extra step, and it does make the files somewhat larger. Recommendations? Does linearizing confer any advantage locally once the entire file is downloaded? Thanks. -- Dave
Re: Linearizing PDF scans
Hey Dave, I've been digitizing docs for free for years Is any kind of standard, recomendation, group, mail list, to discuss the subject? All pdfs in www.tabalabs.com.br/esquemateca were scanned by me. I'm always open to critics and suggestions thanks Alexandre, PU2SEX ---8<---Corte aqui---8<--- http://www.tabajara-labs.blogspot.com http://www.tabalabs.com.br ---8<---Corte aqui---8<--- Em sex., 13 de ago. de 2021 às 17:20, J. David Bryan via cctech < cct...@classiccmp.org> escreveu: > Is it still useful to linearize PDFs? > > I've been scanning and PDFing manuals for 16 years, and I've been > linearizing them regularly. My understanding is that this made them > accessible on a page-by-page basis in Web browsers without requiring a > complete file download first. But given the increase in typical bandwidth > in 16 years, I wonder if this is still useful. It is an extra step, and > it > does make the files somewhat larger. > > Recommendations? Does linearizing confer any advantage locally once the > entire file is downloaded? > > Thanks. > > -- Dave > >
Re: Linearizing PDF scans
On Friday, August 13, 2021 at 17:23, Alexandre Souza wrote: > Is any kind of standard, recomendation, group, mail list, to discuss > the subject? I am not aware of any. I started with Al Kossow's basic recommendations, modified slightly: - scan at 600 dpi - use TIFF G4 where feasible - use tumble to convert to PDF I then wrote and use a couple of simple image-processing utilities based on the Leptonica image library: http://www.leptonica.org/ ...to clean up the scans (the library makes the programs pretty trivial). They start with the raw scans and: - mask the edges to remove hole punches, etc. - size to exactly 8.5" x 11" (or larger, for fold-out pages) - remove random noise dots (despeckle) - rotate to straighten (deskew) - descreen photos on pages into continuous-tone images - quantize and solidify screened color areas into solid areas - assign page numbers and bookmarks in the PDF A good example PDF produced by these programs is: http://www.bitsavers.org/pdf/hp/64000/software/64500-90912_Mar-1986.pdf The cover is a "solidified" black/gray/white image, manual pages 1-2 and 1-4 are continuous-tone JPEG images overlaying bilevel text images, and the rest of the pages are masked, deskewed, bilevel text images. The PDF bookmarks and logical page numbers are auto-generated from the original scan filenames. The final step is linearizing the PDFs, but I'm wondering whether this is still useful. -- Dave
Re: Linearizing PDF scans
On Fri, Aug 13, 2021, 6:15 PM J. David Bryan via cctech < cct...@classiccmp.org> wrote: > On Friday, August 13, 2021 at 17:23, Alexandre Souza wrote: > > > Is any kind of standard, recomendation, group, mail list, to discuss > > the subject? > > I am not aware of any. I started with Al Kossow's basic recommendations, > modified slightly: > > - scan at 600 dpi > - use TIFF G4 where feasible > - use tumble to convert to PDF > > I then wrote and use a couple of simple image-processing utilities based > on > the Leptonica image library: > > http://www.leptonica.org/ > > ...to clean up the scans (the library makes the programs pretty trivial). > They start with the raw scans and: > > - mask the edges to remove hole punches, etc. > - size to exactly 8.5" x 11" (or larger, for fold-out pages) > - remove random noise dots (despeckle) > - rotate to straighten (deskew) > - descreen photos on pages into continuous-tone images > - quantize and solidify screened color areas into solid areas > - assign page numbers and bookmarks in the PDF > > A good example PDF produced by these programs is: > > http://www.bitsavers.org/pdf/hp/64000/software/64500-90912_Mar-1986.pdf > > The cover is a "solidified" black/gray/white image, manual pages 1-2 and > 1-4 are continuous-tone JPEG images overlaying bilevel text images, and > the > rest of the pages are masked, deskewed, bilevel text images. The PDF > bookmarks and logical page numbers are auto-generated from the original > scan filenames. > > The final step is linearizing the PDFs, but I'm wondering whether this is > still useful. > > -- Dave It is of negative value. Any single container for a document makes it easier to handle than a bunch of pages discrete files that must be managed as a unit. Bandwidth is cheaper than human labor. Don't optimize the wrong thing. > > > >
