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101090 discussions

Am2901 sbc, WAS: A classic classiccmp day...

by allisonp＠world.std.com

> From: Tony Duell <ard(a)p850ug1.demon.co.uk> <> >Any other AM29xx chips on it, like a 2909 or 2910 sequencer? Or is this <> >just a demo board for a 4-bit ALU chip? <> > <> >It sounds like a really interesting find, though. The 29xx series chips <> >were interesting devices that have been used in all sorts of machines. <> <> <> Yep, there is a 2909 on board too.... < <Ah, so there's a sequencer. And presumably, therefore, there's some kind <of control store (ROM or RAM) on the output of that. So it sounds like <it's a complete processor, albeit a small one. How small depends on the microcode. It could easily be PDP8 or Nova emulation with one 2901 though it would be slow. I've seen at one commercal design that use it as a fast version of TMS1000 4bitter. It's an interesting chip. I have a bunch of the raw 2901C and 2911 parts. One day when I have time I'd like to try an extended wordlength PDP-8 like machine using them. Say something obcenely long like 20 or 32bits. After all working with that chip 8bits or 80 is as easy from the microcode perspective. Besides it's the microcontroller that is the complex part. Allison

26 years, 1 month

old threaded languages, was Re: Symbolics

by allisonp＠world.std.com

>Anyone remember these? Are there copies? < <There was a Byte Press book "Threaded Interpreted Languages" <from back then. I have it on the shelf at the office, if you <want the ISBN number. Thats it. The ISBN number is likely useless by now. The articles were supposed to get you to a working language but I never saw them all. I've been thinking about languages and OSs and building one for myself figuring what I'd seen back then may help. I'm still leaning toward OS/8 RTS-8 as models. Target cpu is of course z80. Though DEC T-11 would make a good forth engine. Allison

26 years, 1 month

Still need IBM/Lexmark 4033-001 Token RIng docs

by rhblake＠bigfoot.com

Still in need of a copy of the docs for an IBM/Lexmark 4033-001 token ring printer server box. I have 5 units to add to a non-profit group's network son and without them I'll likely be stabbing in the dark. Each unit has it's own unique address on the label but I still need either text, xerox, pdf, or something to go on. Any help is appreciated. Russ Blakeman IT Techie Clarkson, KY

26 years, 1 month

Cipher F880 docs online! (most of them...)

by af-list＠wfi-inc.com

Hi, After having so many people interested in the Cypher F880 op/maintenance manual, I spent a couple of hours scanning it tonight (er...last night), and put it online: http://www.retrobytes.org/docs/cipher/ I indicated "most of them" in the subject because I haven't found a satisfactory way to scan the engineering diagrams, which include schematics and detailed breakdowns, yet. They are 11" x 17" and are very finely detailed. My Ricoh IS430 will only scan that large at a max 400dpi, which is still too coarse to show the details legibly (esp. the schematics) and I think my solution is going to be to scan them in 2 letter-size pieces at 600dpi. Also, in scanning the illustrated parts breakdown figures, many of which are also 11" x 17", I scanned them as 2 8.5" 11" pages and included them inline in the proper section. I have, however, also provided them seperately in their original 11" x 17" form as well, you can't miss 'em. I'll try to get the engineering figures up tomorrow; in the meantime, hope this stuff helps someone! Cheers, Aaron

26 years, 1 month

VMS backup question

by peter＠joules0.demon.co.uk

I have a MicroVAX 3100 on which I intend to install NetBSD and a 2000 with a trashed VMS installation. Is there a way I can create a backup of the VMS installation on the 3100 which I can restore to the 2000, bearing in mind that it probably has a much smaller hard disk? -- Regards Pete

26 years, 1 month

Bogosort (was: old threaded languages, was Re: Symbolics)

by CLASSICCMP＠trailing-edge.com

> If anyone out there doesn't think sorting 1000 signed integers >in 6.8 millisecs isn't fast, code it up on your PC and >see how fast it is. It depends a lot on the algorithm you use in the sort, of course :-). I believe it's in _Numerical Recipes_ that possibly the worst sort algorithm of all is disucssued: "Bogosort": 1. Take the list of numbers you want to sort. 2. Randomly reorganize them. 3. Check to see if they're sorted. If not, go back to step 2. This is a Order(n*factorial(n)) algorithm. I've tried, but I've been unable to come up with anything worse. For your example of 1000 numbers, it'd take (assuming that each operation takes a microsecond) about 10^2554 years to complete. I think the only reason they discuss Bogosort is to emphasize that just because Bubble Sort is the example used in lots of introductory classes, that doesn't mean that you should ever actually use it for anything :-). (Pre-RT-11 5.7 DIR/SORT notwithstanding, of course!) -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927

26 years, 1 month

decayed capstan in Archive QIC

by kyrrin＠bluefeathertech.com

At 18:55 01-03-2000 -0500, Bear Stricklin wrote: <snip> >The drive is an Archive 5945L-2. What is the significance of this; how >similar is it to other, older Archive QIC units, what interface did they >use (it and a similar Archive QIC unit in one of my Convergent NGEN <snip> The 5945L series is, if I recall, QIC-02 interface. The local used PC place near me has a couple of the old 'L' series with intact rollers. If you'd like, I can see if I can snarf them (probably). They'd be yours for shipping, pretty much. -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner and head honcho, Blue Feather Technologies http://www.bluefeathertech.com // E-mail: kyrrin(a)bluefeathertech.com Amateur Radio: WD6EOS since Dec. '77 "Our science can only describe an object, event, or living thing in our own human terms. It cannot, in any way, define any of them..."

26 years, 1 month

VAX 6000 in Brazil...

by mbg＠world.std.com

In case there is anyone interested in such a machine, I just got mail from someone who told me that he has seen a VAX6000 which is otherwise going to be dismantled and discarded... but it is in Brazil. If anyone wants it, can afford to ship it, or lives closer to where it is... contact the I&T people at 55212776000 (that's all I have). I've asked the person who send me the info to send me anything further info he can find out... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

26 years, 1 month

decayed capstan in Archive QIC

by red＠bears.org

Howdy; Last night I discovered with no small amount of chagrin that the rubber capstan in the Symbolics' QIC drive had turned to proverbial goo. Fortunately the Genera distribution tape I used to discover this is only superficially damaged, since it's my only copy. That'll teach me. (: Anyway, I hoped to take the capstan out of a newer Archive QIC and just replace the whole assembly, but they are mechanically dissimilar just enough so this won't work. Enough of the original rubber is gone that I have no indication of what the original diameter of the capstan is. The drive is an Archive 5945L-2. What is the significance of this; how similar is it to other, older Archive QIC units, what interface did they use (it and a similar Archive QIC unit in one of my Convergent NGEN machines both use the same, 50-ish conductor IDC edge-connectors), and how likely is it that this is a common drive? I need to find out what the thickness of rubber in the capstan (and/or its full outside diameter) is so I can begin considering how to repair this. Thoughts, comments, musings? Tony, I think this might be just up your alley. (: ok r.

26 years, 1 month

[OT] Re: DSL Coming -- I may need help!

by allisonp＠world.std.com

<he provider, but they use AT&T for content and Sprint for the backbone. Wh <I first got it, it was like having my own T1 for $40 per month. As they add <more and more people, they began throttling the rates to fit more slots, an <now limit uploads to 128K. I've heard similar in this area. Also to get the bargan rate they want it all and I'm not comforablt with them being the broker for phone, cable and internet and they own little if any of the wire. <You can't put a server on the line, several have tried and they've been kic <off. They also forbid you to tunnel, although I occasionally do. Instead o <tunneling through the $40 cable, they want you to buy @work, which is Of course thats exactly what I'd want (or a IP masqurading router) and also to hang my whole net here on it (vaxen, PCs and whatnot). Allison

26 years, 1 month

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