test-drb December 2005

test-drb@ccmp.vtda.org

235 participants
580 discussions

by ajp166＠bellatlantic.net

> >Subject: Re: PDP-11/73 booting! > From: Doc Shipley <doc at mdrconsult.com> > Date: Mon, 12 Dec 2005 20:59:26 -0500 > To: General at mdrconsult.com, "Discussion at mdrconsult.com":On-Topic and Off-Topic > Posts <cctalk at classiccmp.org> > >Allison wrote: > >> >> Certainly if you can find a BA23 with the rack kit that would be an ideal >> solution just make sure it has the PDP-11 backplane (can have a different >> one for VAX). Then you can transfer the modules you have to it and have >> more usable slots as the backplane is 18 slots (ABAB config). There's >> a plus you'll have the distribution board for the in box mounted RX >> and RD drives. > > Can you elaborate on this? > > I'm running a PDP-11/53 and a PDP-11/83 in BA23s that originally >housed MV-IIs. I never knew there's a difference. The BA23 came with a microPDP-11 backplane or one for the uVAX-II. While the differences are small when used with care they are differnt. For the PDP-11 use the MicroPDP11 backplane is desired as the uVAX one has three slots that are CD wired for PMI bussed memory. the DISK interface and distribution board in the back of the drive cavity however are the same. So if you have a uPDP-11 ba23 you have the disti board and all you need is a 50pin to 50pin to connect that to the RQDXn and the from there the needed (short) cables to the specific drives. Allison

18 years, 9 months

looking to buy/swap/extort old Bytes, PC mag, PC World...

by chrism3667＠yahoo.com

I presently have this in Bytes - all of 1982, half of 83, 3/4 of 84. Nothing else of note. If theres particular issues yer looking for, or have stuph yer willing to unload, please contact. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

18 years, 9 months

PC-DOS 3.3

by ajp166＠bellatlantic.net

> >Subject: PC-DOS 3.3 > From: Mark Firestone <pdp11_70 at retrobbs.org> > Date: Mon, 12 Dec 2005 16:00:01 +0000 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >I don't suppose anyone has a copy of PC-DOS 3.3 they'd be willing to >part with, or make disk images for me? I have to restore an application >on a PS/2 model 30 that requires it, and we've lost the disks (probably >about 10 years ago...) > >Anyone? Please? > >Thanks, > >Mark Use versions up to 6.22 and invoke "setver". Allison

18 years, 9 months

VAXstation 4000 vlc default boot

by williams.dan＠gmail.com

On 12/12/05, Zane H. Healy <healyzh at aracnet.com> wrote: > What are the proper commands to set, and save, the default boot > device for a VAXstation 4000 VLC? Mine keeps defaulting to trying to > boot from ethernet. > > Zane > > > -- > -- > | Zane H. Healy | UNIX Systems Administrator | > | healyzh at 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/ | > If it's the same as the others : set boot xxxx If it's not storing it then the battery may be dead. Dan

18 years, 9 months

Fwd: unknown data tape

by ajp166＠bellatlantic.net

> >Subject: Fwd: unknown data tape > From: John Foust <jfoust at threedee.com> > Date: Sun, 11 Dec 2005 11:01:07 -0600 > To: <cctalk at classiccmp.org> > > >Speaking of audio cassette storage, I received this inquiry >to my web. Click the link to hear the data he has... What's >odd to my ear is that the data seems to be packeted between >carrier. Might this be someone's custom data, as opposed to >ordinary program load/save? No and yes. Most of the cassette schemes were either FM or FSK and both required a carrier to establish sync before the data. there were a quite a few modulation schemes but they can be described as either frequency shift keyed or phase shift keyed and in some ways similar. The important factors were cassette recorder players had poor speed control (both short and long term) high background noise (only soso signal to noise) and lousy bandwidth (rolls off below 300hz and the upper liimit maybe 8-11khz). So the recording schemes had to compensate for that. Allison > >As for why MP3s work fine and .WAV is unnecessary, MP3's >compression divides the signal into ~32 frequency bands, then >encodes the amplitude of those over time. The typical >two-frequency sine modulation used by cassette data recorders >probably fits quite well into those two bins, and MP3 would >recreate the simple sine waves quite well. > >After all, some of the hardware/software decoders within the >classic PCs (as well as their emulators) may have only used >the timings of zero-crossings, so they aren't very sensitive >to perfect reproduction of the waves. > >- John > >>Date: Sat, 10 Dec 2005 16:11:34 +0100 >>From: Paul Geisler <paul.geisler at web.de> >>To: jfoust at threedee.com >>Subject: unknown data tape >> >> >>hello. >> >>i found some old tapes i know nothing about ecept by title it may contain interesting information, and came from merely professional use. >> >>the tapes are recorded on standard compact casette but with some dedication to data recording for example switchable write protection etc. >>the label reads "T 300 Certified Data Casette". >> >>i capture the contents by stereo tape recorder, found both channels nearly equal so guess this mono, mixed them. the tapes are two-sided like normal audio ones. >> >>a strange thing is, that the recording is in small "packets", with empty tape inbetween. i first guessed it is only "empty formatted" tape, but the data packets seem to contain a varying length of information. still strange to waste more than a half of material this way? also strange the packets are ending with a simple tone, instead are headed with, so maybe this is used backward at original drives. >> >>here is a seven packet sample some minutes after beginning of one tape; all tapes seemed to have this same "format" from start to some end location which is not the real tape end: >>http://hirnsohle.de/test/datenSnipplet.wav (16bit mono microsoft-wav 624kb) >> >>i would be very happy if you had any idea how to look at the contents (if any).. i'm currently searching for some sofware "tape modem". i know such things for C64 datasette tapes, so maybe you know some universal program, where different emulations or flexible parameters can be used to find a matching demodulation/decoding? >> >>thanks very much & best regards >>Paul Geisler

18 years, 9 months

CUBIX/6809 updates

by henk.gooijen＠oce.com

If you want to go straight to the PDP-11 website, use www.pdp-11.nl It is a faster link too. The "tshaj" link (named after the book written by Jack Vance) is from an ISP that offers cheap (slow) webspace. As written: comments are always welcome! - Henk, PA8PDP > -----Original Message----- > From: cctalk-bounces at classiccmp.org > [mailto:cctalk-bounces at classiccmp.org] On Behalf Of woodelf > Sent: zondag 11 december 2005 23:31 > To: On-Topic and Off-Topic Posts > Subject: Re: CUBIX/6809 updates > > Allison wrote: > > >Henk, > > > >Love the "Blinkenlight project". ;) > > > > > Well I'm not Henk but here is his site. http://home.hetnet.nl/~tshaj/ This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.

18 years, 9 months

VAXstation 4000 vlc default boot

by healyzh＠aracnet.com

What are the proper commands to set, and save, the default boot device for a VAXstation 4000 VLC? Mine keeps defaulting to trying to boot from ethernet. Zane -- -- | Zane H. Healy | UNIX Systems Administrator | | healyzh at 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/ |

18 years, 9 months

Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software

by ajp166＠bellatlantic.net

> >Subject: Re: Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software > From: "Chuck Guzis" <cclist at sydex.com> > Date: Fri, 09 Dec 2005 11:00:19 -0800 > To: cctalk at classiccmp.org > >On 12/9/2005 at 1:35 PM Allison wrote: > >>I added why it was faster. For the V20 in a XT clone it was easily 10% and >>for the V30 is was more.. > >Yes, but there the tech manuals and your explanation disagree. NEC seems >to think that the dual data busses were the big thing, but you mentioned >the EA calculation difference. Wonder which resulted in more performance >boost. Both. The address calc was on the wider bus so that it was not in a critical path. You needed the busses inorder to do the cal with fewer cycles and intermediate temp storage. The EA calc and the dual busses were important when Intel went to court over it. There were distinct differnces how they worked inside even though the socket was the same. What I never figured out for sure was if the 8080 used current segment or not. the differnce is the 8080 emulation would then be capable of running as if there were N many (available ram/64k) differnt ram areas making a banked 8080 possible. then again I never really looked at that seriously enough to implement. >>On the other hand there is a sorta improved Z80 like thing NEC did, the >>ucom7800 series and they are interesting. Looks Z80 like but the >>instruction set is anything but. I have a bunch of the PIGGYback >>(78PG11) and romless 7800 parts. > >Just look at the Rabbit 2000 instruction set. "Sort of Z80" is the best >way to describe it. Many additions and deletions. Before I programmed it, >I had two choices--either sit down with the manual and carefully note >differences or program it in C, the way Rabbit wanted me to. Suffice it to >say that the level of binary compatibility would be a serious barrier to >getting Wordstar running, if that was one's intent. ;) Fortuately the 7800 never claimed to be Z80. However to anyone familiar it was the same hardware different microprogram. Nice microcontroller with analog. Allison

18 years, 9 months

CUBIX/6809 updates

by ajp166＠bellatlantic.net

> >Subject: Re: CUBIX/6809 updates > From: woodelf <bfranchuk at jetnet.ab.ca> > Date: Sun, 11 Dec 2005 15:31:24 -0700 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Allison wrote: > >>Henk, >> >>Love the "Blinkenlight project". ;) >> >> >Well I'm not Henk but here is his site. http://home.hetnet.nl/~tshaj/ Thanks, should have known as I'ts in my bookmarks as a PDP-11 site of note. Allison

18 years, 9 months

CUBIX/6809 updates

by ajp166＠bellatlantic.net

> >Subject: Re: CUBIX/6809 updates > From: woodelf <bfranchuk at jetnet.ab.ca> > Date: Sun, 11 Dec 2005 14:18:17 -0700 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Dave Dunfield wrote: > >>(The debug enhancements are brought to you courtesy of the stack >>corruption bug :-). >> >> >and the number 6809 ... >Looking at his home page you got alot more stuff about old machines >including a few 8's 11's and 12's. >I think cubix was a good idea, but this 15 years too late for me as I >realize in hindsight that 128k of >memory - split code and data is needed for any real work. This the >crummy 8088 has but not the 6809. If I were doing something that needed I&D and all sorts of space then a 8088 would not come to mind either! Though 68000 would easily or even Z8000. If it were serious work then all bets are off, a paycheck depends on results. For hobby, it's more of doing something unique and different from what I've done before. Also the project has a set of goals, portable, modest power needs (battery), and enough cpu power to be useful as complete project rather than a artifact that has marginal use if any at all. If I were building TTL again nothng less than 24bits. ;) Allison

18 years, 9 months

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test-drb December 2005