On 12/07/2013 09:18 AM, Robert Jarratt wrote: If you need it, I think I have a program here that will dump a TD0 to a pure binary file. I don't know if that will help you out or not. But I've used Dave's IMD utility to convert from TD0 to IMD files on other formats. --Chuck

On 12/10/2013 05:29 PM, Glen Slick wrote: Well, yes and no. All sectors formatted using the 765 FORMAT command are written as equal length, according to the length specified in the command. However, any sort of garbage can be written as sector headers, which are stored in a DMA buffer, 4 bytes per sector. It's possible to adjust gaps so that up to 18 256 byte sectors can be written on a DD track (cf. Televideo 800-series boxes do just that, as do some of the Montezuma CP/M formats for the TRS-80 Model 4. So, the trick is to format 17 256-byte sectors, but placing a 128-byte length indicator in the last "spare" sector. Since the HP150 (Series 1) does not appear to use the sector, no problem. However, since this sector is MFM, most 765 clones will get into trouble when trying to write meaningful data into it. There's a bug in the original NEC design that transfers only 80 of the 128 bytes in a 128-byte MFM sector. But fortunately, there are a few chips, such as the NSC DP8473 can write the sector contents just fine. Reverse engineering at its finest. From the HP150 samples that I have, it seems that no use is made of this short sector. But you never know. If you can find my old HP150.SYS DOS driver, you'll discover that it formats (using the DOS FORMAT command) 16 256-byte sectors for 66 tracks--no extra 128-byte sector. Bat to the question of it being possible to write 16+1 sector tracks, sure, it's possible. A cool gimmick of the FDC not paying attention to sector header information when formatting can be exploited. Write a header that specifies an 8K or 16K sector length, then actually write the sector. The write causes the sector to "eat its tail" and wipe out any ID header information in the process, essentially "wiping" the entire track. --Chuck

On Sat, Dec 7, 2013 at 9:18 AM, Robert Jarratt <robert.jarratt at ntlworld.com> wrote: I also encountered that issue using TD02IMD last year with some of the HP-85 series software images, for example this one: http://www.hpmuseum.net/software/WORDSR80.TD0 I think the issue is that the Teledisk images were built including some additional sectors that are essentially garbage and could be ignored. My solution at the time after spending some time looking at this was to rebuild TD02IMD from the source code available on Dave's site to ignore these extra garbage sectors that were cause the fatal errors. I'd have to look back at my notes on this to remember exactly what I did here. It would be a useful project to go through the Teledisk images on the HP Museum site and convert them all to ImageDisk format. -Glen

<robert.jarratt at ntlworld.com> additional rebuild extra here. http://hp9845.net/9845/projects/hpdrive/ Contains the HPDrive utility and a utility to convert teledisk files to HPI (binary image) New software on the HP Museum site is stored in the HPDrive format. HPDrive also supports simh tape files. All you need to use it as an HP-IB card in your computer. Here you can download Teledisk: http://www.hpmuseum.net/exhibit.php?content=How%20To%20Download -Rik

case, of I had a look and HPIB cards for the PC seem to be quite expensive, and as you say, HPdrive does appear to be picky about the cards it supports when I followed the link. I think converting the Teledisk images is going to be the way to go for me. Regards Rob

From: dwight: Sunday, December 08, 2013 7:22 PM I sometimes use it to run PALASM and also for a cross compilation tool-chain for the 6809. Vince

On Sun, 8 Dec 2013, Dwight Elvey wrote: I use it frequently to run Dave Dunfield's Imagedisk conversion utilities (just images, no actual disk access), and to run the Promlink software for my Data I/O 29B. Works fine, even with Promlink over a physical serial port. Mike Loewen mloewen at cpumagic.scol.pa.us Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/

On 12/9/13 6:32 AM, Steven Hirsch wrote: It should be possible to modify Eric's rfloppy to output IMD instead of DMK http://dmklib.brouhaha.com/

I use Bochs a lot and it works well or me. Rich Cini Sent from my iPhone

I'm using FreeDOS, as a VirtualBox VM, on top of OpenIndiana, one of the Solaris based distro's. Jerry On 12/ 9/13 05:19 AM, Rich Cini wrote:

On 12/08/2013 07:22 PM, dwight wrote: I have to confess to using DOSEMU instead of DOSBOX. It integrates better with Linux, and will run 16- and 32-bit PM applications. The latest versions are much, much better than the older ones. The catch is that the new versions must be built from source (git). Most distro precompiled packages are old versions. If I want more compatibility than that, I'll use either VirtualBox or just boot DOS an another system. FWIW, I'm not interested in DOS gaming. --Chuck

On Mon, Dec 9, 2013 at 1:58 AM, Chuck Guzis <cclist at sydex.com> wrote: That was my question about DOSEMU vs DOSBOX. I've only ever used DOSBOX for DOS gaming, and it seems fine. If DOSEMU is great for console applications but doesn't do well with graphics or sound, I'll probably stick with DOSBOX. -ethan

I had real problems running non gaming stuff in Dosbox (majorBBS in particular). I use virtualbox with freedos for that stuff now, works perfectly.... On 9 December 2013 15:13, Ethan Dicks <ethan.dicks at gmail.com> wrote: -- Yoyodyne Propulsion Systems: "The Future Begins Tomorrow" Visit us at: http://www.yoyodyne-propulsion.net -------- "It's easy to win. Anybody can win." -- Philip K. Dick, A Scanner Darkly

I tried running MajorBBS under it, on Linux. DosBox would get slower and slower and the whole thing would grind to halt after a while. I suspected some sort of memory leak. This was a big problem with that version of MajorBBS, as it uses btrieve and if it dies it tends to corrupt it's databases. I rebuilt the whole thing using a beta version of freedos with network support, and it's been fine every since. On 9 December 2013 17:43, John Wilson <wilson at dbit.com> wrote: -- Yoyodyne Propulsion Systems: "The Future Begins Tomorrow" Visit us at: http://www.yoyodyne-propulsion.net -------- "It's easy to win. Anybody can win." -- Philip K. Dick, A Scanner Darkly

On 12/09/2013 07:13 AM, Ethan Dicks wrote: What I like about DOSEMU is the shared access to files between Linux and DOSEMU. FWIW, there is a CLI argument in DOSEMU for passing direct hardware access to a specified range of ports. I've never had to use it, so I can't say how well it works. I don't know if it's possible to have cut-and-paste between Linux and DOSEMU windows, but's possible with certain guest OSes (e.g. Windows XP) to do that under VirturalBox. --Chuck

On 12/09/2013 10:29 AM, Mike Loewen wrote: I'm aware of that, but DOSEMU allows me to boot from a Linux directory. I don't think that DOSBOX does. --Chuck

On 12/09/2013 11:46 AM, Ethan Dicks wrote: DOSEMU is not really a DOS emulator--only in the sense that there are some optional GNU utilities to do various things, such as run a Linux command from a 16-bit environment or drivers for sound and CDROM, etc. The user supplies his own copy of DOS; I've run Win98SE, PCDOS 7.0, FreeDOS 1.0 and MSDOS 6.22 on the thing. --Chuck

It seems the general consensus is now that the effects of the peroxide bath aren't permanent. On Mon, Dec 9, 2013 at 1:08 PM, Inaki Castillo <contact at xilcore.com> wrote:

On Tue, 10 Dec 2013, Terry Stewart wrote: Is anything, other than Ubik, permanent? Over time, the deterioration and chemical reaction is getting deeper and deeper. Treating the surface will only be temprorary unless you find a way to reverse entropy to the depth that it had occurred. Maybe yellow is the permanent natural color, and white/beige was just temporary, to begin with?

I suppose it's quite possible that the cleaner used can only affect the molecules at or very near the surface, and then the molecules (bromide I think?) deeper in migrate up to the surface in the "cleaned" plastic over time. I am not a chemical engineer though. On Dec 9, 2013, at 10:28 PM, Chuck Guzis wrote:

Sounds intriguing - is this the carpet care product I find in Google? -- Ian Resistance is not futile. It is voltage divided by current. Ian S. King, Sr. Vintage Systems Engineer Living Computer Museum A presentation of Vulcan, Inc. http://www.livingcomputermuseum.org

I'm always wondering if after treating, a coat of something like art fixer would keep it from yellowing again. dwight

That is what I've used as the "activator" in my retrobright treatments. It will deyellow things on it's own but these whitening products do use a lot of surfactants. http://www.classic-computers.org.nz/blog/2011-01-21-deyellowing-with-oxy-on… Terry (Tez) On Fri, Dec 13, 2013 at 6:05 AM, Chuck Guzis <cclist at sydex.com> wrote:

In my first try I used a 4 hours bath, but in my second try I did just a 2 hours bath with similar results, although the plastic were not the same quality. Lets see what happens with just one drop of product for 1 hour. I will posts photos later. (to be tested on my Apple IIc monitor!).

Beware with using lots of sodium percarbonate "product". Here's one of my experiences which didn't go so well. http://www.classic-computers.org.nz/blog/2011-04-11-lisa-keys-retrobrightin… Terry (Tez) On Fri, Dec 13, 2013 at 9:09 AM, Geoffrey Oltmans <oltmansg at gmail.com>wrote:

On Mon, 9 Dec 2013, Inaki Castillo wrote: Search Google for "retr0brite". g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind. http://www.diy-cockpits.org/coll - Go Collimated or Go Home. Some people collect things for a hobby. Geeks collect hobbies. ScarletDME - The red hot Data Management Environment A Multi-Value database for the masses, not the classes. http://scarlet.deltasoft.com - Get it _today_!

On Mon, Dec 09, 2013 at 02:09:34PM -0500, Ethan Dicks wrote: I'm surprised they take a hard line about that. A bug is a bug -- they're all worth fixing, and even if it doesn't bite you where it hurts this time, it might next time. John Wilson D Bit

I use it to run the Pegasus emulator, and to run old gwbasic hpgl blotting programs. Physical Printer port access may need a special build. Dave G4UGM On 9 Dec 2013 03:26, "dwight" <dkelvey at hotmail.com> wrote:

We do. We have some old DOS-only programs for programming some old corporate 900-MHz phones. At 09:22 PM 12/8/2013, you wrote: 444 . [Humor] When I was in high school, I got in trouble with my girlfriend's Dad. He said, "I want my daughter back by 8:15." I said, "The middle of August? Cool!" --Steven Wright a50mhzham at gmail.com ? N9QQB (amateur radio) "HEY YOU" (loud shouting) ? Second Tops (Set Dancing) ? FIND ME ON FACEBOOK 43? 7' 17.2" N by 88? 6' 28.9" W ? Elevation 815' ? Grid Square EN53wc LAN/Telecom Analyst ? Open-source Dude ? Musician ? Registered Linux User 385531