test-drb February 2009

test-drb@ccmp.vtda.org

196 participants
309 discussions

by aek＠bitsavers.org

> Please mail me, if you are interested in the data i was reading from the ROMs. > It is in Binary format. Sorry to post this here, but email to the address you used appears to be bouncing. I'm interested.

15 years, 9 months

8088 vs. 80c88

by les＠hildenbrandt.com

> > >> I am assuming the problem relates to following a lxi sp instruction >> immediatly with a call instruction, I can see how pipelining >> instructions could cause this failure. I cant immagine how calling >> the address which happens to match the sp would be an issue. > > >As far as we could determine, it was precisely the issue. >> My thought was that most cp/m programs either left the sp alone, and used >> the stack provided by cp/m, or set up a local stack early on in the >> program. In either case this bug could be completly avoided. Am I wrong >> here? Is the bug related to calling the address which happens to be in >> the sp? > > >Again, yes. I am sorry I am so slow here. Which is the problem? The value or the sequence? >Probably not a bug, but definitely a factor in determining if I >should have bothered to use the V20/30 for emulation at all. >Certainly, I wondered if the lack of Z80 instruction set support >would have been an issue. It was--and I supplied a software emulator >for that. Fortunately, I also included an software 8080 emulator, so >even users of JRT Pascal weren't left hanging. The Z80 thing is an interesting point. Before I started running CP/M on a V20, I allways ran on a 8085. I would get annoyed when cp/m software required a z80, because it was not a z80 operating system. I later did build a few z80 systems, a laptop and a 20mhz sbc system, but all of the coding I did for them was 8080, except for using the 16 bit io address features of the z80. >To clarify my point, would you try to run CP/M on a Rabbit uC with >all of its "we're just like a Z80 except when we're not" instruction >set? I've never tried, as the compatibility issues are just too >severe. I assumed the rabbit was a z180, you learn something new every day. I have done a few designes with z180's, but I cant even rememer what language tools I used at this point. Les --------------------------

15 years, 9 months

UNIX for the VAXstation or AlphaStation

by slawmaster＠gmail.com

Hi all; I realize that this sorta overlaps with a previous thread or two, but I thought I'd start a new one rather than practice necromancy. So, I've got both a VAXstation 4000-60 and an AlphaStation 250 here and after playing with it for a bit I've decided I don't really care for VMS so much that I want it on both of them. I'd like to find an interesting, preferably AT&T-style UNIX to run on one of them, so I'm hoping some of you can help me figure out my options. So far, I know I can run: -NetBSD -Probably some DEC/HP UNIXes (Tru64 on the Alpha?). I'd really appreciate perspectives on these different systems, user/admin experience, etc. I'm not looking to accomplish anything in particular here, I just want something to play around with on my DEC hardware while I wait for the PDP-11 :) Thanks John Floren -- "I've tried programming Ruby on Rails, following TechCrunch in my RSS reader, and drinking absinthe. It doesn't work. I'm going back to C, Hunter S. Thompson, and cheap whiskey." -- Ted Dziuba

15 years, 9 months

Heat Failures

by ohh＠panix.com

Hey, all: I'm hoping for some info about older micros and heat failure. We have an archaic system at work which is going stupid on us, and we're looking at repair-or-replace options. Let's say you have a system which is locking up due to heat problems. I suspect we've all seen that from time to time. We're talking failures where you can cool things down and reboot and the system comes back and works again, not failures where things are visibly melting and/or burning. :) Is there a "typical" mechanism by which heat causes a system to go south? If you get a system which is knocked out by heat, does it make it more prone to being knocked out by heat in the future? In other words, do heat failures make a system physically more susceptible to more such failures - is the damage cumulative? Any relevant info appreciated. Thanks! -O.-

15 years, 9 months

Whatever happened to MENTEC and the PDP-11?

by RodSmallwood＠mail.ediconsulting.co.uk

The last I heard of them was a takeover by Calyx. in 2006 I can't see any reference to PDP-11 on the Calyx Website. So what happened ? Rod (Renovates Old Dec)

15 years, 9 months

Halted

by ajp166＠bellatlantic.net

> >Subject: Re: Halted > From: Fred Cisin <cisin at xenosoft.com> > Date: Fri, 27 Feb 2009 15:21:58 -0800 (PST) > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >> > They died a really long time ago, probably by 1983. I grew up in >> > Wakefield, MA and remember them well. I used to raid their dumpster and >> > those around them. > >On Fri, 27 Feb 2009, Chuck Guzis wrote: >> Poly Paks actually had something left after sending their stuff out >> to put in a dumpster? The mind boggles! :) > >What would Poly Paks reject? Only totally nonfunctional parts without any metals value. Allison

15 years, 9 months

UNIX for the VAXstation or AlphaStation

by ajp166＠bellatlantic.net

> >Subject: Re: UNIX for the VAXstation or AlphaStation > From: "Zane H. Healy" <healyzh at aracnet.com> > Date: Fri, 27 Feb 2009 20:47:24 -0800 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >At 10:54 PM -0500 2/27/09, John Floren wrote: >>So, I've got both a VAXstation 4000-60 and an AlphaStation 250 here >>and after playing with it for a bit I've decided I don't really care >>for VMS so much that I want it on both of them. I'd like to find an >>interesting, preferably AT&T-style UNIX to run on one of them, so I'm >>hoping some of you can help me figure out my options. So far, I know I >>can run: >>-NetBSD >>-Probably some DEC/HP UNIXes (Tru64 on the Alpha?). >> >>I'd really appreciate perspectives on these different systems, >>user/admin experience, etc. I'm not looking to accomplish anything in >>particular here, I just want something to play around with on my DEC >>hardware while I wait for the PDP-11 :) > >UNIX is a waste of good DEC hardware! :-) DEC never sold a UNIX >variant that would run on a VAXstation 4000/60. I think NetBSD and >OpenBSD will both run on it. I'll confess that OpenBSD at least used >to rock on Alpha and can handle a machine with less RAM than OpenVMS >expects. Your choice of OS's are a lot wider for the Alpha. DEC sold Ultrix32 (unix BSD flavor) and it was installable on most VAXen. I have 4.2 running on a UVAX2000. >As for a PDP-11, I recommend RT-11, RSTS/E, or RSX-11M+, not UNIX. For low end PDP11 Unix up to V7 runs. If you have one of the I&D machines (11/44, or any of the J-11 cpus) then BSD2.11 is interesting. >For UNIX get a Sun or SGI system, in other words cool hardware that >only runs UNIX. I did buy a nice DECstation 5000/133 (a MIPS box) >years ago to run NetBSD. I wonder what happened to that machine... > All the DEC mips machines run unix (ultrix). Or find an Alpha and run true64. Allison >Zane > > >-- >| Zane H. Healy | UNIX Systems Administrator | >| healyzh at aracnet.com (primary) | OpenVMS Enthusiast | >| MONK::HEALYZH (DECnet) | 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/ |

15 years, 9 months

FS: DEC H3104 (36-Pin to 8 MMJ ports) -- New, never opened

by eric940＠gmail.com

For USA folks only, sorry... I have 3 of these: DEC H3104 (36-Pin to 8 MMJ ports) They are all new, in factory sealed bubble wrap, never opened (not even for the pictures). All include mounting screws. PHOTOS: http://www.flickr.com/photos/35806042 at N03/ $10 each (includes shipping - will provide tracking number) Please reply off list if interested. -Eric

15 years, 9 months

Free: IBM 3151 31/41 DEC/IBM terminal emulation cartridge

by eric940＠gmail.com

(USA folks only, please.) IBM 3151 31/41 Cartridge Part number: 94X4114 PICTURE: http://www.flickr.com/photos/35806042 at N03/sets/72157614533585520/ Never used it myself, but apparently emulates IBM & DEC terminals. Found it at my last job. I'm guessing it plugs into an IBM terminal? Doesn't seem to have a standard PCMCIA edge connector. Out of curiosity, I wouldn't mind knowing a bit more about it. Contact me off list, and it's yours free. -Eric

15 years, 9 months

Antikythera fans

by rdawson16＠hotmail.com

wondering if you guys love this as much as I do. I would like to make a user group/club for it if there is enough interest For myself, I am fully equipped here with machine capability and stage one is to make the model (2005) as currently known. Stage 2 is heck make these in volume, its a marvelous thing and may be profitable. You cannot find a better classic computer than this. Randy Dawson _________________________________________________________________ Access your email online and on the go with Windows Live Hotmail. http://windowslive.com/online/hotmail?ocid=TXT_TAGLM_WL_HM_AE_Access_022009

15 years, 9 months

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test-drb February 2009