test-drb October 2004

test-drb@ccmp.vtda.org

245 participants
540 discussions

by aek＠spies.com

> Other than software for the PDP-8 was there any low cost time sharing systems > that you can still find software for? "low cost time sharing system" was almost an oxymoron in the 60's and early 70's Both the cost of core, and for mass storage devices kept computer configurations capable of timesharing pretty expensive. TSS-8 was probably the first timesharing system for $50,000. As I recall, the final configuration of the TSS/8 system I used at the University of Wisconsin - Milwaukee was closer to $100K by the time we added the KL8/E's and RK05's. Early RSTS (originally called Edusystem-100) was somewhat less expensive, but the pre RSTS/E systems were pretty limited. There are a few other timesharing systems from the 60s for which software has been found that I'm aware of: Some bits of CTSS at Paul Pierce's web site Some of the MIT PDP-1 timesharing system The SDS-940 GENIE timesharing system The BCC-500 timesharing system. (I just received permission to release this) The Oregon State University OS-3 CDC 3300 timesharing system. CAL-TSS for the CDC 6400 may be on some 7 track tapes that were just given to Paul Pierce to read. There is also the software available for Hercules (TSS-360, for example)

19 years, 10 months

Difference 23512 and 27512 Eprom

by birs23＠zeelandnet.nl

Hi, I know very little about electronics and eproms so this question might be really easy. I would like to know what the difference is between a 23512 eprom and a 27512 and if there are any differences if its possible to make some sort of adapter. Had a look at some schematics and they looked the same to me, data lines on the same pins etc. Any help is welcome. Ow the reason I want to know this is that I want to read some old roms in my EPROM reader. Cheers, Stefan.

19 years, 10 months

Semi-OT: Virtual PC 7 on Mac OS X

by cb＠mythtech.net

>I believe you have to have the VPC extensions for the OS, and that MS-DOS >isn't a supported OS under VPC7. I bypass this by having a virtual D: Drive >for DOS and Win98, and booting the Win98 system when I need to copy files >from the Mac to DOS. I could do it under WinXP, but that would interrupt >what I have running there, and it takes a lot longer for XP to boot (or >shutdown). Yes, I do believe VPC came with drivers to do it under DOS. Gee, and Connectix swore that MS was not going to bastardize VPC. The first official MS release and suddenly they don't support old MS operating systems. What else do they conviently not support? I am curious if the old VPC drivers would work with the new version. Maybe all they did was stop releasing the driver set. Do you have an older version of VPC? I have the 2.0 CD here and it comes with a VPC drive file that contains DOS drivers for folder sharing, CD access, and S3 video drivers for Win3.1. Alas, the file is 20 MB so a little big to email to you (I could stick it on an FTP site if you want). I have NO idea if these drivers would work with VPC 7 or not. -chris <http://www.mythtech.net>

19 years, 10 months

Anyone driving from Boston area to VCF West?

by brian＠quarterbyte.com

Hi, Is anyone from the Boston area going to be driving to the west coast for the VCF, or for any other reason, anytime in the forseeable future? I'm trying to get a TTY model 40 printer a hitchhike out here. Thanks, Brian =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- _| _| _| Brian Knittel _| _| _| Quarterbyte Systems, Inc. _| _| _| Tel: 1-510-559-7930 _| _| _| Fax: 1-510-525-6889 _| _| _| Email: brian(a)quarterbyte.com _| _| _| http://www.quarterbyte.com

19 years, 10 months

Semi-OT: Virtual PC 7 on Mac OS X

by williams.dan＠gmail.com

On Wed, 20 Oct 2004 21:58:43 -0700, Zane H. Healy <healyzh(a)aracnet.com> wrote: > Does anyone have any experience running MS-DOS 6.22 on VPC? I've > managed to get Win3.1 running in SVGA mode at 600x800, and I've got > some of my old DOS software copied over. > > What I really want to know how to do is access the CD-ROM, Ethernet > Card, and if possible get video drivers for the S3 card that VPC > emulates. Oh, and I need a mouse driver for the PS/2 Mouse so I can > run a couple games :^) > > In case anyone cares, so far I've gotten the following working: > AROS > BeOS 4.5 > BeOS Max > MS-DOS 6.22/Win 3.1 > Windows 98SE > Windows XP Pro SP2 (it came with this, so it had better work) > > Obviously only Win98 and WinXP support the cooler features such as > mapping folders on the Mac as network drives, and printing to the Mac > printer. > > Zane > > -- > -- > | Zane H. Healy | UNIX Systems Administrator | > | healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast | > | | Classic Computer Collector | > +----------------------------------+----------------------------+ > | Empire of the Petal Throne and Traveller Role Playing, | > | PDP-10 Emulation and Zane's Computer Museum. | > | http://www.aracnet.com/~healyzh/ | > After reading these posts I feel I have to point out windows has to be the easiest way to have vms and cp/m running on the same desktop (no flames). cp/m-86 runs great under vpc on windows. Also the most important thing I can play leisure suit larry and both police and space quest as well which I could barely do under 98.. I assume these would still work using a mac. Dan

19 years, 10 months

[Milsurplus] Relay Racks (fwd)

by jpl15＠panix.com

For the general interest of folks who might be generally interested... ---------- Forwarded message ---------- Date: Thu, 21 Oct 2004 16:25:40 EDT From: K2CBY(a)aol.com To: milsurplus(a)mailman.qth.net Subject: [Milsurplus] Relay Racks For list members in the New York City - Long Island area. There's a guy in western Suffolk County who has a large number of high quality 19-inch relay racks for sale in good condition at very reasonable prices. The only downside is they have to be picked up in person. Contact Thomas Maerz at _tmishear(a)aol.com_ (mailto:tmishear@aol.com) or (516) 790-8846. Miles Anderson, K2CBY 16 Round Pond Lane Sag Harbor, NY 11963 ______________________________________________________________ Milsurplus mailing list Home: http://mailman.qth.net/mailman/listinfo/milsurplus Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Milsurplus@mailman.qth.net

19 years, 10 months

5 1/4" hard-sectored disk..

by dwight.elvey＠amd.com

Hi Jim It might be a good idea to check the clock rate of the data from the disk. If it is that standard 2 uS, per pulse, one can read it with most any hard sectored controller. ( Heathkit H89 comes to mind ) Getting the data from the disk is the first step. Most everything after that is just choice of implementation. Dwight >From: "Jim Donoghue" <jim(a)smithy.com> > >I have some 5 1/4" hard-sectored disks that contain CPU microcode. They >aren't 'formatted' with a filesystem, but are read with a simple board >that contains some 9602's, a shift register, and a Z80. A dilemma: >should I try to intercept the data from the board, write it to flash >memory, and build a board to replace the whole Z80/hard-sectored disk >thing, *or* try to build something to write the data stream out to >another 5 1/4" disk. The Z80 doesn't care about the sector pulses - only >the index pulse. So I could get away with a standard floppy instead of a >hard-sectored one. > >The disk thing would allow me to keep using the original hardware, which >would be nice, but I don't know the first thing about attempting to >write the data stream back to the disk. > >I have no backups of the microcode disk, and no way to replace it when >it dies. Every time I fire the thing up I feel I'm getting a little >closer to it's death... > >Jim > > >

19 years, 10 months

Difference 23512 and 27512 Eprom

by dwight.elvey＠amd.com

>From: birs23(a)zeelandnet.nl > >Hi, > >I know very little about electronics and eproms so this question might be >really easy. I would like to know what the difference is between a 23512 >eprom and a 27512 and if there are any differences if its possible to make >some sort of adapter. Had a look at some schematics and they looked the >same to me, data lines on the same pins etc. > >Any help is welcome. > >Ow the reason I want to know this is that I want to read some old roms in >my EPROM reader. > >Cheers, > >Stefan. > > Hi I think that the 23512 is a EEPROM and the 27512 would be a normal EPROM. The biggest issue is what to do with the programming voltage and any auto type sensing. Most newer programmers have a way to set the programming voltage to 5V instead of what ever. They also usually include some way to turn off the auto sense that would otherwise bring one of the pins to a higher than normal voltage. If those two conditions are met, you should be able to read the 23512. If there are issues with the select lines being inverted between the two, I often stack two machine pin sockets. I then can cross wire what I want by either popping out an unwanted pin or breaking off the tip of one that I don't want to have connected. For these two parts, I believe that the address and data line match. Note that many programmers keep the programming voltage high, even when reading since the newer EPROMs are strobed with a TTL level input for programming. So look out for this. Even if you don't tell it to program, it can have an unexpected high voltage on one of the pins. Dwight Dwight

19 years, 10 months

OK, all you beige-box people in S. Calif (USA)

by tomj＠wps.com

Sorry for the tease, it's not really that interesting. At UC (Univ. Calif.) Irvine surplus is a smallish pile of PC and Apple goodies. This inventory is from my faulty memory, don't blame me... I just got a working HP 6MP printer for $20, disturbingly, half the cost of repairing my LaserJet 4 (the ordinary rear rollers crumpling sheets problem). Parallel and appletalk interfaces. A few more, 5mp and 6mp left. One with a stuck switch but seemed to work. Got a P120 for $15, works, HDD, flop, CDR, few megs RAM, and the XVGA PCI card I need to repair another machine. A bunch (dozen) of Apple LaserWriters, 16/600? Bunch of iMac type monitors, 17"? 19"? Apple. A few P120, 486 machines, hard disks, two flavors floppy, CDRs. Eh. Some Syquest drives, ext cabs with SCSI, about 4? 6? 8? Some bunch of other removable high-capacity media, JAZ or whatever, I don't look at beige objects generally. It's all "sanitary landfill" (sic) to me. Assante? Ethernet cards, nuBUS? One with manual, a small thing with little ables and aadapters, one was bigger. I barely looked. Prices are CHEEP. Much of the stuff works, it was dumped by some department upgrading. Open Tuesdays and Thursdays, only, 10am - 1pm, and 2pm - 5pm. Cash. Open to the public. Mostly junky furniture, very little tech. Behind UCI North Campus complex (little cluster of low buildings), on Jamboree, about 100 ft west of Campus Drive, Irvine. Arrive from route 73, exit Jamboree or Campus.

19 years, 10 months

Excercising vintage items - was: Commodore 8010 IEEE-488

by dave04a＠dunfield.com

At 14:34 21/10/2004 +0000, you wrote: >On Thu, 2004-10-21 at 07:39 -0400, Dave Dunfield wrote: >> Anything you would add? > >The comment made recently about memory drawing excess current if inputs >are left floating is interesting though. Proof that you do need to know >about the system you're testing as taking the modular approach to >powering up doesn't always work and might actually do more harm than >good. Thats true, and there are other concerns - I've seen devices which go thermo if there's no clock! - Thats why I do this only if I can't test the power supply separately, and only power it very briefly - long enough to verify the power rails. >The other thing I'd add to that is to always use a dummy form of mass >storage in place of any real media, even after you're confident that the >power supply is OK - just in case on first full boot the system decides >to stomp all over the media. Good point - I always disconnect drives etc. at first power-up, but one area where I've seen people have trouble is in floppy disks - DON'T USE THE MASTER DISKETTE ON FIRST ATTEMPT TO BOOT! I always try to find ways to backup the disks and boot from a copy if at all possible. I just got a Kaypro in where the guy had tried to boot it after it had sat for a number of years, got a loud shrieking noise after which the boot disk was missing a band of oxide - Fortunately, he had the sense not to try another disk. Regards, Dave-- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html

19 years, 10 months

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test-drb October 2004