Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!lll-crg!nike!ucbcad!ucbvax!B.ISI.EDU!Info-IBMPC From: Info-IBMPC@B.ISI.EDU (Info-IBMPC Digest) Newsgroups: mod.computers.ibm-pc Subject: Info-IBMPC Digest V5 #72 Message-ID: <8607242248.AA22863@ucbvax.Berkeley.EDU> Date: Thu, 24-Jul-86 16:58:26 EDT Article-I.D.: ucbvax.8607242248.AA22863 Posted: Thu Jul 24 16:58:26 1986 Date-Received: Fri, 25-Jul-86 00:17:55 EDT Sender: woutput@ucbvax.BERKELEY.EDU Reply-To: INFO-IBMPC@B.ISI.EDU Organization: The ARPA Internet Lines: 760 Approved: info-ibmpc@usc-isib.arpa Info-IBMPC Digest Thursday, July 24, 1986 Volume 5 : Issue 72 This Week's Editor: Richard Nelson Today's Topics: AST RAMvantage, Goldbow Cache-AT IBM Xenix 2.0 (System V) Ctrl-Z in C (Lattice) Compilers using Extended Memory - Lattice C ProComm and Clobbered Directories Verifying Files with Checksum Write-Protection (2 msgs) File Recovery from Bad Directory/FAT Volume Labels Clock/Cal w/out Expansion Slot (2 msgs) Sanyo RGB Pinouts DeSmet C v2.41 Bug EGA and DR LOGO Problem Today's Queries: Super Hi-Res Display Query PCs as Automatic Consoles of /370 Mainframes Query Epson Users Group Query Hercules Graphics, Redirection of Printer Output Queries PC Designs ET-286i Query Video Presentation System Query Floppy Drives on New XTs Query PC FORTRAN Query Pop-Up Scientific Calculator Query Tape Backup thru Ports or Network Query Disk Access Protection Query ---------------------------------------------------------------------- Date: Sun, 20 Jul 1986 23:43 MDT From: WANCHO@SIMTEL20.ARPA To: GFT.IVO%gsbadm.uchicago.csnet@CSNET-RELAY.ARPA Cc: WANCHO@SIMTEL20.ARPA, INFO-IBMPC@B.ISI.EDU Subject: AST RAMvantage, Goldbow Cache-AT Another choice for taking advantage of all that extra memory is to get Software Carousel. It lets you configure up to 10 different memory partitions (some of us call them forks), with each of those partitions containing separate environments up to the size of the real amount of low memory you have. I'm using Software Carousel now on an 512K XT clone (SC also swaps to disk) and I can hardly wait to move to an AT clone with 3.1 Meg of otherwise useless memory (unless some variant of Unix appears on the contract). I'd like to hear from others using SC and any of the other products from SoftLogic Solutions. --Frank ------------------------------ From: Herm Fischer Reply-To: HFischer@ada20.isi.edu To: info-ibmpc@isib Subject: IBM Xenix 2.0 (System V) Date: Mon Jul 21 18:13:13 1986 The upgrade release of IBM Xenix 2.0 (actually Microsoft Xenix System V) is filling up the pipeline now. Some observations on the product: - the documentation is MUCH improved; for example, there is now a nice honestly usable section on writing device drivers, and lots of very useful hints on system functions (like signals...) Unfortunately, they seem to have dropped the C language reference section (maybe to compensate for all the extra paper...) - system calls are compatible with system III (IBM Xenix 1.0); your old system 3 programs run without recompiling on system V! - you CAN install it on a system which is up and running IBM Xenix 1.0 without trashing or loosing anything, except for a few bugs: (a) /usr/lib/uucp/dial.c needs ~ICANON (reset off) because unbuffered stream input no longer returns data when typed and not followed by a c/r... (e.g., looking for modem prompts) (b) /etc/systemid is not preserved on reinstall (c) /usr/lib/mail/aliases.hash not preserved or rehashed for mailer but the unhashed aliases are preserved... (d) crontab duplicates new some entries; one needs to manually merge old and new crontabs, and add output ">" and "2>1" redirection; also, crontab is in a new place they did a nice job preserving and merging your system 3 and their new system V files... old ones have an X3 appended and new ones have an X5 appended... generally all is left in executable shape. there are some nice new system calls (like nap(millisecs) to augment sleep(seconds) ) I've managed to convert my graphics driver to run on Xenix 2.0; IBM does now provide some nice hooks to directly access screen memory from user programs (but you need an auxiliary handler if you want text output not lost when in the graphics mode). I've also managed to convert the AMI 8-port (serial board) driver to Xenix 2.0. Both drivers are available on a free beta-upgrade basis to licensed users. Herm Fischer {ihnp4,decvax,trwrb}!hermix!fischer ------------------------------ Date: Sun 20 Jul 86 22:21:13-EDT From: Joseph M. Newcomer Subject: Ctrl-Z in C (Lattice) To: info-ibmpc@B.ISI.EDU If you want to read a file which may contain control characters, you *must* open the file in 'binary' mode, e.g., use the "rb" option on the open. If you are writing such a file, use "wb". Otherwise newlines will cause perverted behavior, and ctrl-Z will be EOF on input. I regularly use Lattice C to read odd types of binary files, and it works fine. Remember that you will get a carriage return ("\r") character before a linefeed ("\n") and it is up to you to dispose of it on input and insert it on output (if you care). Until Lattice C 3.0, you also had to use the "b" modes if you wanted ftell() to give the right file position. This is said to be a bug which is fixed in 3.0, but I've not tested it. joe ------------------------------ Date: Sun 20 Jul 86 22:33:41-EDT From: Joseph M. Newcomer Subject: Compilers using Extended Memory - Lattice C To: info-ibmpc@B.ISI.EDU I regularly use extended memory in Lattice C; I do this by telling it to use my VDISK RAMdisk as the place where it writes its 'quad' file (the intermediate form between phase 1 and phase 2). The rule from my 'makefile' is shown below. Also included is the way I abort a link if there were any compilation errors. The .BAT file which invokes psmake (UniPress) does a 'del' of the file 'nolink'. Note that LC1 and LC2 must be run separately. This has a significant impact on the compilation time, about a factor of 2 when I run on my fast disk (C:) and about a factor of 3 when I run on my slow disk (D:). The VDISK is E:. #---------------------------------------------------------------------------- # Joe's favorite 'makefile' template #---------------------------------------------------------------------------- # Standard prolog # This designates where the compiler is found COMPILER = c:\lc\ # This defines the 'vdisk' used for the quad files VDISK=e: # This defines the local disk which is the target for the output and # location of the source LDISK=d: SRCEXT = .c .c.obj : del $*.obj $(COMPILER)lc1 -o$(VDISK) -ms -d -n -ic:\lc\ -s -u -im: $< $(COMPILER)lc2 -o$(LDISK) $(VDISK)$* if exist $*.obj goto $* echo * * * Compilation of '$*' failed >> nolink :$* ############################################################################## # The files ############################################################################## WHATEVER.EXE: $(WHATEVER) $(LINKFILE) makefile if not exist nolink goto oklink echo ***** Compilation errors exist ***** type nolink goto nolink :oklink link @$(LINKFILE),whatever,whatever,$(LIBRARIES)/map/line/segments:256 :nolink #---------------------------------------------------------------------------- ------- ------------------------------ Date: Sun, 20 Jul 86 21:58:53 PDT From: crash!pnet01!adamsd@nosc.ARPA (Adams Douglas) To: crash!noscvax!info-ibmpc@usc-isib Subject: ProComm and Clobbered Directories Another piece of software that you should NOT abort out of in a nonstandard manner is Procomm. In my case, I swapped floppies and THEN told Procomm to exit to DOS. Guess what? It wrote the directory of the disk I Had just removed onto the new diskette! To Connie with the Dead Directory. Yes, the Norton Utilities have a routine to search and reconstruct a directory with. There are also several public-domain utilities of varying sophistication for the same purpose. However, you'll have to spend some time and learn about how directories are put together to avoid REALLY messing things up...power=responsibility and all that. ------------------------------ Date: Tue, 22 Jul 1986 01:57 EDT From: James H. Coombs Subject: Verifying Files with Checksum To: INFO-IBMPC Someone asked recently about a facility for calculating checksums or CRCs for files before backing them up. I just discovered that the LISTFILE program that comes with REXX has a CHECKSUM option. Since the program also has a TREE option, it would be easy to traverse an entire disk and direct the directory information and checksum value into a file. I guess the next step would be to sort the output and compare it with the output from a previous run (there are some PD compares that resynchronize). REXX is from Mansfield Software Group, which advertises regularly. So far as I know, they do not sell LISTFILE separately. If you know REXX, it's well worth the $100 or so. (It's slow but good for quick jobs.) --Jim P.S. I have seen some CRC source floating around. Perhaps someone has a copy if you want to use CRC and develop your own driver. ------------------------------ Date: Sun, 20 Jul 1986 23:56 MDT From: WANCHO@SIMTEL20.ARPA To: "COX R.G." Cc: WANCHO@SIMTEL20.ARPA, INFO-IBMPC@B.ISI.EDU Subject: Write-Protection Some disk drives use optical sensors to detect the write tab. I know, because I just discovered mine does, after it wrote to a supposedly write-protected disk. The write-protect tab was red and transparent! --Frank ------------------------------ To: info-ibmpc@isib Subject: Writing on Protected Disks Date: Mon, 21 Jul 86 13:26:28 -0500 From: jcmorris@mitre.ARPA In a recent issue of this digest R. C. Cox reported that dBASE III had trashed a floppy which was write protected. The note speculated that write protection was a software-only function which could be bypassed. As far as I can tell from reading the schematics, write protection can't be bypassed by software...but can be fooled by design blunders in some drives. The column Peter Norton writes for PC Week recently reported that Norton lost data in the same manner: a program wrote on a protected disk. He discovered that his drives detected protected disks by looking for the reflection caused by the shiny metallized protection tab...and his diskettes had either the black tabs (like Verbatim is now packaging) or didn't have write-protect notches...in other words, they didn't have the reflective quality which the drive used to detect protected status. Most drives don't have this problem since they use a mechanical switch to detect the write-protect tab. [An aside: I HATE vendors who distribute expensive software on diskettes with the write-enable notch uncovered.] Having come close to accidentally clobbering a verrry expensive master disk a while back, I finessed the problem by adding a front-panel toggle switch to my (full-size) floppy drives. The switch ties up the write- protect line, ensuring that the floppy can't be written to. Total cost was $1.59 for a switch at Radio Shack, plus an hour or so of my time to figure out how to disassemble the drive safely. Joe Morris (jcmorris@mitre) ------------------------------ Date: Mon, 21 Jul 86 14:00:15 CDT From: CCRJW%UMCVMB.BITNET@WISCVM.ARPA (Richard Winkel UMC Computing Services) To: INFO-IBMPC@USC-ISIB.ARPA Subject: File Recovery from Bad Directory/FAT You should first see if the FAT was overwritten, as well as the directory. An easy way to do this is to run CHKDSK (don't use the /F option!) and check for error messages. If you get 'lost cluster' or 'cross linked file' messages, the FAT might be ok, in which case you could do a 'RECOVER d:' (d: is the drive spec) and save yourself LOTS of hassle. You'd get back all the original files; all you'd have to do is rename them appropriately. If the FAT is no good, you can use a routine in the NORTON.COM program to browse free disk clusters and chain related clusters together. First, though, you'll need to purge the phony directory and FAT by doing the following: Do a CHKDSK /F on the disk to free any 'lost clusters', then use one of the many pd utilities to 'unhide' any hidden files, and finally, do an ERASE *.*. If chkdsk reports bad sectors, you'll also need to manually zero out both copies of the FAT. You can use the sector editor in NORTON.COM to do this. Then use NORTON to chain clusters into files. Good luck! ------------------------------ Date: Mon, 21 Jul 86 11:02:13 PDT From: Jim Anderson To: info-ibmpc@usc-isib.arpa Subject: Volume Labels If you wish to mess with volume labels under DOS 2.x you should use the old style (FCB) function calls. The new style find first call will not find a volume label under 2.x. I think this is fixed in 3.x. Rules to keep in mind for 2.x: 1. If the disk has no label you can make one using the create function. 2. Never delete a volume label. It will destroy the FAT! 3. If you wish to change the volume label, use rename. 4. I don't know how you might get rid of an existing volume label other than by directly writing the directory sector. ------------------------------ Date: Mon, 21 Jul 86 07:37:23 cdt From: mlw@ncsc.ARPA (Williams) Message-Id: <8607211237.AA06865@ncsc.ARPA> To: info-ibmpc@usc-isib.ARPA Subject: Clock/Cal w/out Expansion Slot A footnote about "dCLOCK," mentioned in Vol. 5, Issue 71: The device is sold by: MICROSYNC Computer Products Department P.O. Box 116302 Carrollton, TX 75011 214-492-5265 for $59.95 (please add $2 for shipping and handling)... All this from PC Mag, Vol 5 No 14 p 407. None of which represents any en- dorsement, real or implied, of the device or company by me or (heaven forbid) the govt. Mark L. Williams (mlw@ncsc.arpa) ------------------------------ Date: Mon, 21 Jul 86 09:48:05 cdt From: nather@SALLY.UTEXAS.EDU (Ed Nather) To: INFO-IBMPC@B.ISI.EDU Subject: No-slot clocks & portable PCs We have bought, and are using, the "dClock" sold by Microsync (sorry, I don't have their address with me) in several portable [lugable] IBM PCs and have been very satisfied. The portable PCs were officially discontinued at the time of the Laptop announcement, so we are in the same position as owners of PC jrs, Lisas, etc. The clocks come on a small board that contains a dip socket -- you plug the board into the socket the 8088 normally fits in, and put the 8088 into the socket on the board. That's all there is to the installation -- if you didn't bend any pins anywhere. You have to be careful. The clock comes with a manual and printed software for reading and setting -- you type in a BASIC program that generates a pair of small .com files. The clock does NOT work in CompuAdd's "Standard Brand" PC -- the board layout is different and there's no room for it. The advantage to the portable was that there are only 2 long slots free, and we needed both. We upgraded the motherboards to 640K (the Microsync manual tells you how to do that, too), bought a half-slot color card, and a Plus Hardcard (10MB), and ended up with a HEAVY but quite usable portable PC system we can lug to and from our observatory. Ed Nather Astronomy Dept, U of Texas @ Austin {allegra,ihnp4}!{noao,ut-sally}!utastro!nather nather@astro.AS.UTEXAS.EDU ------------------------------ Date: 1986 Jul 22 09:04 EST From: Bob Babcock To: , Subject: Sanyo RGB pinouts If you look at the DIN connector from the back of the cabinet, and number the pins clockwise from the notch, with 8 in the center, the signals are: 1 - Red 2 - no connection 3 - Horizontal sync (negative) 4 - Ground 5 - Vertical sync (negative) 6 - no connection 7 - Green 8 - Blue Note that the IBM PC uses positive sync, so unless the monitor is switchable to use negative sync it will not work on the Sanyo 555. The September 1985 Soft Sector has a simple sync inverter circuit made from a Quad 2-Input Nor (Radio Shack part no. 4001) and a 9-volt battery. The each output sync is the NOR of the input sync and ground (i.e. inverted). The battery powers the chip. Sanyo also makes an IBM-like video board for the 555. This board has the same 9-pin D connector as the IBM PC, and uses the same sync polarity as the IBM PC. Good luck ------------------------------ To: info-ibmpc@usc-isib.ARPA, malpass@ll-vlsi.ARPA Subject: DeSmet C v2.41 Bug Date: Mon, 21 Jul 86 21:48:26 -0500 From: James R. Van Zandt The DeSmet C compiler seems to be quite free of bugs. However, I have found that if (1) any variables (either local or global) are declared "static", and (2) The compiler is called with the -c switch to let you use the debugger later, and (3) malloc() is called to allocate a variable from the heap, then the heap will overlap the static variables. Can someone test versions 2.50 and 2.51? - Jim Van Zandt ------------------------------ Date: Tue, 22 Jul 86 09:01:31 est From: munnari!trlamct.oz!tyers@seismo.CSS.GOV (Peter Tyers) To: info-ibmpc-request@usc-isib.arpa Subject: EGA and DR LOGO Problem This query may be repeating old ground but I've only recently joined the mod.computers.ibm-pc list, if so an apology. Has anyone managed to run Digital Research LOGO (DR LOGO) on an EGA equipped PC or PC-Clone. It would appear that the DR LOGO distribution directly drives the screen and despatches raw CGA commands to the device which unfortunately are not compatible with an EGA equipped system. When booting the LOGO disc on my EGA equipped system I get the loading DR LOGO message and the disc gets very busy. Unfortunately the screen then goes dead and no further action is seen. The same PC-clone equipped with a CGA loads and executes LOGO perfectly. Thus I suspect the EGA, is this a generic problem or is my EGA-clone not truly EGA compatible? If a generic problem, has anyone attempted to solve it and/or succeeded? >From the Byte review I believe DR LOGO was written to operate under CPM-86 if this is the case is it worth my while obtaining a copy of this or since the Australian distributors no longer stock CPM-86 its claimed successor Concurrent CPM? Is it possible to patch the drivers LOGO uses to make it utilise the EGA rather than a raw CGA mode? Any assistance, patches or suggestions would be appreciated. ------------------------------------------------------------------------------ P Tyers, Telecom Australia Research Laboratories ACSnet tyers@trlamct.oz (Australian Computer Science Network) CSnet tyers@trlamct.oz ARPAnet tyers%trlamct.oz@seismo.arpa UUCP {decvax,vax135,eagle,pesnta}!mulga!trlamct.oz!tyers PaperMAIL P Tyers Telecom Australia (Research) P.O. Box 249 Clayton VICTORIA 3168 AUSTRALIA ------------------------------ Date: Mon, 21 Jul 86 07:51:47 cdt From: mlw@ncsc.ARPA (Williams) To: info-ibmpc@usc-isib.ARPA Subject: Super Hi-Res Display Query Does anyone have any experience with very high resolution devices for the PC...like the Number Nine, Matrox, Control Systems Artist Series, etc.? I'm interested in how these units work for non-CAD operation, if they can be used for general purpose work to advantage, what monitors they can be used with, which one(s) are best, etc. etc. Please do not exclude mention- ing CAD...I just want to make sure other facets of the units' uses are addressed. You can send messages to me directly and I'll summarize for the digest, or just route 'em through the digest itself. Thanks... Mark L. Williams (mlw@ncsc.arpa) ------------------------------ Date: Tue 22 Jul 86 10:58:19-EDT From: Francisco Camargo Subject: PCs as Automatic Consoles of /370 Mainframes Query To: info-ibmpc@B.ISI.EDU I'm posting this message from Brasil, therefore you shouldforgive me if I kill your natural language. (my English needs to be warmed up...) The basic Idea for this query is to use PCs as automatic consoles for large IBM systems. We would like to hear from anybody with some experience in doing so. We intend to use IRMA like boards for the connection of the PC s and the mainframes, and we have no idea of the kind of performance we can expect from such boards. Just for the record we run an installation with one 3084 and three 3081 processors in an MVS-XA & JES-2 environment. Also, we would like to know about the existence of any language for process automation which could easy the process of implementing such automatic consoles. [P.S.: I'm posting this message on behalf of BANCO ITAU S.A., a brazilian bank for which I'm an employee and who has sponsored my education at Columbia University. I shall summarize the replys and post them back in this bulletin board.] Francisco Camargo CAMARGO@CUCS20 ------------------------------ Date: Mon Jul 21 09:40:04 1986 From: jperry@sri-unix To: info-ibmpc@usc-isib Subject: Epson Users Group Query Does anyone out there know about an Epson Users Group with 30-40 disks of freeware available? If so, could someone point me to an online source? Much thanks to anyone who can. John Perry ------------------------------ Date: Tue 22 Jul 86 08:54:13-EDT From: "Anthony J. Courtemanche" Subject: Hercules Graphics, Redirection of Printer Output Queries To: info-ibmpc@B.ISI.EDU Hi. I have two (disjoint) questions that I hope someone can give me answers to. 1) I have a Leading Edge "D" with a monocrome monitor which as of yet has not given me any IBM compatibility problems. When I bought the machine, it was advertised as supporting Hercules Graphics. There are two ports on my video driver (one for color and mono) and there is a switch to switch between color and mone. In BASIC, lo and behold, I am able to get monocrome graphics. But, when I try to run some PD software that uses graphics other than from BASIC, most programs terminate saying "You need graphics to run this program." What sort of graphics don't I have? Does the message mean that I need a color system to run the program or are Hercules Graphics (whatever they are) different from the type of graphics that PD people are writing programs for? Do I need a different video board to run these programs? 2) Is there a clever way to redirect output to the printer ports to go to the screen or a file. I am playing with a PD program that uncompresses some documentation and outputs it to the printer, but the documentation is 110 pages and I don't want to print so many pages unless I know whats on them. The compressed document does not seem to be ARC or LU compatible. Many thanks to anyone who can give me some help on these questions. --Anthony Courtemanche ------------------------------ Date: Tue 22 Jul 86 14:50:06-EDT From: Thomas S. Wanuga Subject: PC Designs ET-286i Query To: info-ibmpc@B.ISI.EDU Does anyone have any experience with the PC Designs ET-286i? It's an AT compatible with 6/8/10 Mhz operation, motherboard has - 3 serial ports, 2 parallel ports, 1M memory (4M using 1Mb DRAMS). Replies will be summarized to the digest. Thanks. Tom Wanuga wanuga@mit-xx ------------------------------ To: info-ibmpc@b.isi.edu, info-graphics@ads.ARPA Subject: Video Presentation System Query Date: Wed, 23 Jul 86 08:03:51 -0500 From: tink@mitre-bedford.ARPA I'm looking for a PC based "slide system" like STORYBOARD (by IBM) or VideoShow (by General Parametrics). I'm hoping that there are some other packages out there since neither of these seems to fit my needs. What I'm looking for are packages in the $100 - $500 hundred range that can create a story line, including pictures (STORYBOARD has only a rudementary editor for creating the graphics - most of its input should come from other packages). It would also be nice if this package included hardware that allows the result to be displayed through a video projector. Steve Feuchtbaum TINK@MITRE-BEDFORD ------------------------------ Date: Wed, 23 Jul 86 11:08:38 ADT From: wdw%ACADIA.BITNET@WISCVM.ARPA (Bill Wilder) Subject: Floppy Drives on New XTs Query To: info-ibmpc@usc-isib.arpa I have been using one of the new IBM XT's (new keyboard, floppies etc.) for the past few days and have noticed that the system is very sensitive to the proper insertion of floppies. Many retries will occur, terminating in an error. This continues until the floppy is removed and then reinserted at which point it works well. I've also noticed that the drive in use light remains on for several seconds after disk activity terminates. Makes me a little nervous about changing floppies too soon. Can anyone tell me if these problems are unique to my particular machine or whether they are characteristic of the new XT's in general. ------------------------------ Date: Wed 23 Jul 86 13:19:26-EDT From: Howard P. Marvel Subject: PC FORTRAN Query To: info-ibmpc@usc-isib.arpa I am posting the following for a friend not on the net. Please reply directly to me. You can use marvel-h@osu-20. I am seeking information regarding Fortran compilers and (especially) math/ stat libraries for the IBM PC AT. I have experience with MS Fortran 3.31 and would appreciate comparisons to RM Fortran 2.0 and Lahey Fortran, which has just been released in a 2.0 version. I have seen Chris Wolfe's review in PC Mag last year. MicroWay in Boston said that RM 2.0 is best for porting mainframe IBM VS Fortran programs to the PC. Of course, they don't handle (or haven't) the Lahey compiler. In libraries: IMSL offers two PC libraries which are expensive at retail ($350 each) and very incomplete relative to their mainframe IMSL library. These have recently become available under inexpensive site licenses for about $20 per copy. MicroWay offers the NAG (Numerical Algorithms Group) library from England. What else is available? I particularly need good matrix inversion (MicroWay offers an assembler program for this -- any good?), random number generators, and distribution functions (normal, central F, noncentral F, chi-square, etc.). These may be in assembler or Fortran. Ideally, I would like to purchase a subset of the IMSL library but they refuse to sell an arbitrary collection of subroutines. All my research is in Fortran. I don't want stat packages such as SAS or StatPro, etc. Richard Anderson, Department of Economics, Ohio State Univ, Columbus OH 43210 ------------------------------ Date: Wed, 23 Jul 86 15:30:41 pdt From: Gerry Key To: info-ibmpc@usc-isib Subject: Pop-Up Scientific Calculator Query Does anyone know of a good pop-up scientific calculator for a PC/XT or /AT or compatible? --Gerry Key key@nosc.arpa ------------------------------ To: info-ibmpc@b.isi.EDU cc: johnson@dewey.udel.EDU Subject: Tape Backup thru Ports or Network Query Date: Thu, 24 Jul 86 08:24:52 -0400 From: johnson I am looking for a tape backup system to backup 3 ATs, an AT clone (ncrpc8), and 2 XTs a few times every week. Speed is no issue, as the backups can run at night. Each one of these machines has an asynch port and a parallel port, so if anyone has an external tape backup system that allows one of these ports as an interface, we could use a single device to backup all of our machines. Failing that, if anyone has found a good, inexpensive network and software that supports backup of any client's hard-disk, please describe your installation. We would like to be able to backup the entire disk, just given directories, or just files tagged with the "un-archived" bit, or files created after a given date, (and to restore them with similar specificity). I am interested in your negative experiences (what to avoid) as well as your positive ones. thanks. johnson@dewey.udel.EDU ------------------------------ Date: Thu, 24 Jul 86 11:34:53 EDT From: Erik Brown Subject: Disk Access Protection Query To: info-ibmpc@B.ISI.EDU Would anyone out there be able to suggest any literature about ways to limit access to resources on an ibm pc? We need to devise some software to prevent unauthorized users from gaining access to the hard drive. We would like this to work even if the machine is booted from the floppy drive. Any ideas? Thank you, Michael Domino ------------------------------ End of Info-IBMPC Digest ************************ -------