test-drb January 2007

test-drb@ccmp.vtda.org

238 participants
538 discussions

Victor 9000 boot floppy, was RE: laptops and 5.25 inch floppy drives?

by aek＠bitsavers.org

> I've seen mention of a Hardware Technical Reference for the Victor. > If anyone has a copy I'd be interested in hearing from you. I've just uploaded scans of the Tech Ref and several other tech docs to http://bitsavers.org/pdf/victor/victor9000

17 years, 11 months

Heathkit H77 Case

by marvin＠rain.org

I have the Heathkit H77 case where the pieces that hold the front panel to the chassic got broken off. With JB Weld to the rescue, I went ahead and fixed it only to find out a "small" problem. It seems that the label on the front of the case covers the screw holes and I *really* don't want to poke holes in it as it is in excellent condition. Has anyone tried to remove that front label, and if so how? My first thought was to take a heat gun and warm up the adhesive to the point where the label might come off without damage. My second thought was to ask here :).

17 years, 11 months

Olivetti M20

by roger.holmes＠microspot.co.uk

On 15 Jan, 2007, at 18:00, cctalk-request at classiccmp.org wrote: > > Message: 1 > Date: Sun, 14 Jan 2007 10:58:12 -0800 > From: "Chuck Guzis" <cclist at sydex.com> > Subject: Re: Olivetti M20 > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > Message-ID: <45AA0CC4.14431.CE01A94 at cclist.sydex.com> > Content-Type: text/plain; charset=US-ASCII > > On 14 Jan 2007 at 16:17, Roger Holmes wrote: > >> Can anyone please tell me if the Olivetti M20 used a Z8010 memory >> management unit? > > What would have been the point on a system that can accommodate at > most, 512K? 1) To prevent one process overwriting the memory belonging to another process. Segments did not HAVE to be 64k, that was their maximum size, the minimum was 128 bytes. 2) To provide virtual memory. 3) To protect the executive from processes. 4) To allow non contiguous physical address space to appear as a logical contiguous address space 5) To provide mapping out of faulty blocks of memory and probably as many reasons I have not thought of off the top of my head. Best regards, Roger. > > Cheers, > Chuck

17 years, 11 months

Olivetti M20

by roger.holmes＠microspot.co.uk

On 15 Jan, 2007, at 18:00, cctalk-request at classiccmp.org wrote: >> Can anyone please tell me if the Olivetti M20 used a Z8010 memory >> management unit? > ---snip--- > > Hi Roger > No, it didn't use a 8010. It could have but I believe that when > the project was started, the 8010 wasn't ready yet. > They used a ROM instead. They do a number of interesting > logical to physical mapping but these could have been done > with a 8010 just as easily ( and more flexibly ). > Most of the mapping is to handle the holes that the video > causes. Some is related to the dual mapped memory. > Even with the full 512K of memory, I don't know of any > application that needed more than 384K. > Dwight Many thanks Dwight. A pity they did not at least use RAM instead of ROM. Roger.

17 years, 11 months

Parting out Teletype model 43

by wdonzelli＠gmail.com

I am going to part out a somewhat junky model 43 Teletype. Anyone need parts? Let me know soon, as I reach for my tools tonight... -- Will

17 years, 11 months

Data Systems Design DSD-880 8" floppy and hard drive?

by JHuang＠eminc.com

Hi Stuart. Do you still have this 8" floppy drive. If not, could you tell me where can I found it. I use this fool on old Amistar Insertion Machine and most of them can read/write. Thanks for ur response. Jeffery yjdhuang at yahoo.com

17 years, 11 months

Minivac 601 documentation copies/scans?

by tony.eros＠machm.org

I've been building a bit of a collection of logic/computer trainers, one of which is a Minivac 601. Originally, there were a set of manuals for this unit that detailed some construction projects. I'd really like to get a copy or scan of the full documentation. Is there anyone with a full documentation set for the Minivac who would be willing to either copy it for me or lend me the manuals so I could scan them? I asked this question a while back on the list and someone replied, but I wasn't ever able to finalize getting copies and now I've managed to misplace the relevent emails... Thanks! -- Tony

17 years, 11 months

a riviting topic

by RodSmallwood＠mail.ediconsulting.co.uk

-----Original Message----- From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of Jules Richardson Sent: 12 January 2007 17:15 To: On-Topic and Off-Topic Posts Subject: Re: a riviting topic Brian L. Stuart wrote: > There's a type of rivit called a pop rivit that I've used before. I > get the impression that it's not as good a the sort used in > manufacturing, but for this kind of purpose, I'd think it would do fine. Is rivit a US variation or a typo? (it's 'rivet' this side of the pond) Anyhoo... agreed that for this kind of work it should be fine. The tool needed should cost virtually nothing (I'd certainly expect it to be less than $10US) and is really easy to work with. Places like Halfords and B&Q will sell them in the UK (along with better tool shops too); in the US Home Depot almost certainly have them and probably Wal-mart too. Same applies to the rivets themselves. I've always wondered how the massive rivets on ships are put in, in particular how on earth they get them to also be watertight around the hole! cheers Jules

17 years, 11 months

FW: FREE! Motorola VME-10 System and Motorola Development Hardware

by DLawrence＠mctl.co.uk

Hi Bruce, A real long shot this - We have a poorly VME10. I know your web entry is dated 1999, and that you stated that you were going to ditch your VME10 'in the next week' if you had no response, but I was wondering if, by some chance, your VME10 was still available (I'm always the optimist ;-) ) Please could you let me know either way. Many thanks, David Lawrence I.T. Consultant MCT Limited Tel : 01730 894834 Fax : 01730 892641 E-mail : dlawrence at mctl.co.uk Internet : http://www.mctl.co.uk <http://www.mctl.co.uk/> ________________________________ avast! Antivirus <http://www.avast.com> : Outbound message clean. Virus Database (VPS): 0703-0, 13/01/2007 Tested on: 15/01/2007 11:09:57 avast! - copyright (c) 1988-2007 ALWIL Software.

17 years, 11 months

Token ring hub

by Glen.Heiberg＠gijima.com

You could look out for an original IBM 8228 MAU (Multistation Access Unit). These have 8 workstation ports and a pair of RI/RO (Ring In-Ring Out) ports, and is a passive device (did not need AC power). Alternatively, you could look out for an IBM 8230 CAU and LAM (or the Madge equivalent). However, these are quite bulky. All the above use the big IBM connectors with type-1 cabling. Cat 5 cables with RJ45 connectors can be used as long as you use a balun. I have never encountered a tokenring NIC that only had RJ45 connectors; there was always a DB9 connector. Also, you don't need any "token ring starter upper". The first station that inserts into the ring generates the token. All stations must use the same ring speed (either 4Mbps or 16Mbps). The first station that joins the ring must be set to a fixed speed; subsequent stations inserting into the ring can be set to autosense the ring speed. If the EISA TR NIC you have is indeed a 100Mbps device, it will only do 100Mbps TR when connected to a 100Mbps TR switch, and these seem to be fairly rare. For moderate to high network loads, a 4Mbps TR network would run rings ;-) around an equivalent 10Mbps Ethernet network. For simple TCP/IP connectivity between a TR and ethernet network, setup a Linux box with any IBM TR nic based on the "tropic" chipset or a Madge NIC (Linux drivers availble from their website) and your choice of supported ethernet NIC, and setup IP routing. Regards Glen, Teo Zenios wrote: > >Also what is a good way to bridge Token Ring to Ethernet so that these 486 machines can use my router/cable modem? > > Jim wrote: >I purchased some 3Com 3c359's off ebay, and built up a linux box to >bridge them. > >There is a 3c509 on the ethernet side. There is a 3174 on the token >ring. It is a standard MAU, no rj45 baluns. Don't forget on ancient >MAU's you have to have a token ring starter upper, to charge up >the hub. I had a years old one, and was informed to use the supplied >IBM starter to set up mine. I might point out that the MAU had no >active power, as some of the ones which use rj45's do, and that >may have had to do with the "starter upper" gizmo. > >Anyone who can educate me on that one would do me a favor, I >just did it and it worked (after replacing the 9v battery in the IBM >gizmo) > >Jim

17 years, 11 months

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test-drb January 2007