test-drb January 2003

test-drb@ccmp.vtda.org

388 participants
970 discussions

by Fred.van.Kempen＠microwalt.nl

Yes. On the 2950, set the port to 10Mbps, half-duplex, no flow control, no spanning tree: int fastethernet 0/xxx speed 10 duplex half flow none spanning-tree portfast no shutdown or somesuch. The Cisco ASIC's hate the VAX ethernet port, same here on my 4000. Basically, the ether connection is bouncing between between various modes, making it slow and such. --fred

21 years, 11 months

TI (Texas Instruments) Silent 700 Model 725, their 1st portable data terminal (circa 1971)

by collison＠cnri.reston.va.us

How to find an interested buyer? - I know Ebay, but that is a 7 day window for what I would presume to be a small audience of interested parties - and how to value/price it? This was my personal unit, last used in the late 70s to access the then ARPANET. Still powers up. Very Good condition. This was TI's 1st Silent 700 portable data terminal (they produced the 1st Silent 700 in 1969, but not a portable) - per TI's web site - is this collectible?

21 years, 11 months

A way to erase OTP components?

by dwightk.elvey＠amd.com

>From: "Arno Kletzander" <Arno_1983(a)gmx.de> > >Hello everybody, this is something I've been wondering about for some time >now. Perhaps here is the place to ask, since it's about one of the "inner >secrets of silicon": > >Tony Duell wrote: >> The 8751 is the EPROM version of the 8051 microcontroller. It's otherwise >> identical to it. >> >> If it's in a ceramic package with a quartz window, then you can erase it >> like any other EPROM and reprogram it. If it's in the plastic package, >> then it's the OTP version. > >If in fact the same die was used in both components, then it's only the >plastic (which is impenetrable to the commonly-used ultra-violet light) that >prevents the OTP variant from being erased and reprogrammed. > >However, there are kinds of radiation similar to light which *will* >penetrate the plastic housing...you see where this goes? Will the memory be erased >when you, say, X-ray the OTP component, will it stay unaffected, or is the >thing just going to die? > >(just outta curiosity) > >Arno Kletzander > Hi The trick is impart just enough energy to the electrons to get them to tunnel through the insulation. If you start hitting things too hard, you'll start to damage the crystal structure. UV light will both penetrate into the floating gates and react with the desired amount. One could use x-rays to erase the chip but you'd need an intensity that is great enough that it would also damage the chip. The amount of x-ray energy captured by the gate in a normal x-ray picture is quite small. Since x-rays go through greater depths without reacting and have higher energies, they will most likely damage the chip while erasing the charge on the gates. Materials change the amount of transparency at differing frequencies of electromagnetic energy. UV is just right to penetrate the silicon oxide cover and be absorbed by the poly-silicon gates. It is interesting that the flight at high altitudes is probably more damaging to electronics than the inspection x-ray at the gate. Dwight

21 years, 11 months

Dear Santa, I would like a VAX

by Fred.van.Kempen＠microwalt.nl

> And, if you have a lot more money available: (just came up on > comp.sys.dec.micro) > > http://www.aub.nl/vaxsales/ > > a 3100-85 for 600 (money units not specified) > a 3100-80 for 500 > both for 1000. Each includes 3 VT510+keyboard. One includes a CD. These guys are impossible to deal with. I have been working with them since, uhh, September last year to get this lot from them, and have dropped the deal since, as they're being impossible. The money units are in EURo's, I would assume. They first wanted to just get rid of the stuff, then someone changed their mind, and now they seek to get as much cash off it as possible. Beware. --fred

21 years, 11 months

Reply to: Slightly OT: Need a new touchscreen for an Apple MP2x00

by nerdware＠ctgonline.org

Come on over to www.newtontalk.net. Lots of guys with parts sources and the know-how to fix it. Very useful source of info for us Newton guys. You'd be surprised at the amount of development still going on for the Newt... Paul ORIGINAL MESSAGE FOLLOWS: HI, Anyone know where I can source the resistive touchpad element for an Apple Messagepad 2x00 from? Tim.

21 years, 11 months

oric - 1

by keith.burke＠xilinx.com

Rob, I read your little piece on the web about your british micros. Do you still own the Oric-1? I used to have one as a kid and now that I'm a computer science graduate I thought I might try and get my hands on my first computer. I've chucked the old one long ago... it gave up on us after a pretty rough time in my house. Do you happen to know where I might find one? Keith -- / 7 /_( |_| |_| |_| |_| /\ /\|=|/ / \ |_| / ) _ \ / |_| \ / -=-o / \ /~\_/ \/

21 years, 11 months

Ressurecting Mac Plus

by tim.myers＠sunplan.com

Hi all, I've got a Mac Plus I got of Ebay some time ago. Anyone any idea how I can (legally) obtain an OS for it? I'd like to add a HDD to it; I've an old 600Mb in an external box lying around, am I going to be able to use this (even if I only get a 20/40/80Mb partition on it I'm a happy chicken.). Tim.

21 years, 11 months

Quasijarus 4.3BSD on 1600bpi magtape

by msokolov＠ivan.Harhan.ORG

Ethan Dicks <erd_6502(a)yahoo.com> wrote: > Is there a "toggle-in" VAX bootstrap for a TS-11 or TU-80 or for > anything for that matter? There are 5 different toggle-in bootstraps. TS-11 is one of them. As I understand it, TU80 looks like a TS-11 to software, so the original enquirer who was asking about TU80 should be all set. > Between 1984 and 1994, I installed a lot of > operating systems on PDP-11s and VAXen, and my experience is that > for VAXen, the magtapes were never bootable - you booted a console > floppy/tape/disk pack/whatever that had drivers for pre-TMSCP > tape drives (MT and MS) and you told the standalone programs which > disk to copy to and which tape to copy from (our primary machine > at work had a MASSBUS-attached TU-78 and a Unibus-attached TU80 - I > kept the TU-80 ;-) That is how it works with DEC OSes. It is also one option with BSD. BSD, however, offers another option, using only the magtape. Of course on the original big VAXen the magtapes were not "bootable", but Appendix B of Installing and Operating 4.3BSD UNIX on the VAX (SMM:1) contains little programs in hex that you can type into memory from the console (called toggle- in programs in reference to toggle switches that predated the console). There is a different version for each kind of tape controller. Each program is to be entered at 200 and run with certain registers manually set to the controller CSR address, etc. Each time you run one of these programs, it reads one 512- byte record from the magtape at 0 and halts. The first file on the 4.3BSD distribution tape had 512-byte records and the first 5 of them were secondary tape bootstraps for different tape controllers. You would run your toggle-in program with S 200 the right number of times to load the right secondary bootstrap and then run the latter with S 0. It would give you a = prompt at which you type the name of the standalone program you want to run. These standalone programs are stored in the first file on the tape after the secondary bootstraps, and the secondary bootstrap programs load them. Between the 5 secondary bootstraps (5 512-byte records) and the tp archive with standalone programs (in the same tape file also with 512-byte records) there were two unused records. I took advantage of this in 4.3BSD-Quasijarus0a to add MicroVAX booting ability to the same tape without breaking the big VAX boot mechanism described above. The MicroVAX tape boot program is 1024 bytes long and neatly fit in the room that was left, but because MicroVAXen boot automatically using their ROMs unlike the manual process above, the MicroVAX boot program had to be first. To satisfy this requirement I simply rearranged the order: now the MicroVAX bootblock is first, followed by the 5 big VAX secondary bootstraps, followed by the tp archive with standalone programs. The big VAX booting mechanism still works with the 4.3-QJ0a tape just like with the original 4.3, the only difference is that because the secondary bootstraps are now two records further down the tape, you type S 200 two more times than the manual says. > Things changed a bit with MicroVAXen - early OS kits assumed RX50, later > ones assumed TK50, but never magtape. To the software there is absolutely no difference between TK50 and magtape as long as both speak TMSCP. TMSCP magtapes are bootable on MicroVAXen just like TK50s. This is the reason why I do not make separate dist tapes for big VAXen and MicroVAXen, the same tape is used for both and you write magtapes and TK50s in exactly the same way from the same files on my FTP site. > > I've added two blocks for MicroVAX booting in front of the first file on > > the dist tape, but didn't update the Installing and Operating manual... > > You will probably have to cruft up something close to that, but one > aware of the 11/750 if you are going to make a bootable magtape. I don't need to cruft anything up: for big VAXen nothing changed except the order of boot blocks, and I simply need to update the manual to increment by 2 the number of times one types S 200. I'll do that in the 4.3-QJ0b release. MS

21 years, 11 months

Pinout for HP 2629b terminal?

by jimw＠agora.rdrop.com

subject says it all... Looking for the comm port pinouts. Thanks; -jim --- jimw(a)agora.rdrop.com The Computer Garage - http://www.rdrop.com/~jimw

21 years, 11 months

Heathkit H-11A (LSI-11) on eBay

by Fred.van.Kempen＠microwalt.nl

Damn, and I had one, complete, a long time ago... threw it out when I finally got a "real" PDP-11. *bonks head against wall* stoopid, stoopid.. --fred > -----Original Message----- > From: Hans Franke [mailto:Hans.Franke@mch20.sbs.de] > Sent: Wednesday, January 22, 2003 4:09 PM > To: cctalk(a)classiccmp.org > Subject: Re: Heathkit H-11A (LSI-11) on eBay > > > > > Does anyone on the list have any PDP-11 papertape? I don't mind > > > image files of the data - I have punches and blank tape. > > > No, but if anyone is feeling particularily insane or rich, I'll sell > > a Heathkit H10 paper tape system for $1000 ;) I dont have anything I > > can use it with. > > Well, I love to add a H10 to my H8, but somehow the one(s) > and zeros got mixed up in your nibble. > > Gruss > H. > > -- > VCF Europa 4.0 am 03./04. Mai 2003 in Muenchen > http://www.vcfe.org/ >

21 years, 11 months

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test-drb January 2003