test-drb July 2005

test-drb@ccmp.vtda.org

257 participants
628 discussions

by mbbrutman＠brutman.com

I almost hate to ask the obvious, but does something have specifications for the SASI protocol? That would go a long way to answering some of the questions. There was a SASI adapter for a PCjr that went in the modem slot from a company called RIM. It had a bridge board that connected it to a Seagate MFM drive. The chipset name escapes me at the moment, but I thought it was either NCR or Zilog doing second source for NCR. It smells awfully like SCSI. (I don't have the beast - I've just seen pictures of it. But I'd love to know what makes it tick.) Mike

18 years, 11 months

Wang paper tape format?

by vcf＠siconic.com

I have some paper tapes that I'm trying to read and I have good reason to believe they are from a Wang machine of some type. They seem to hold some sort of document. The writing on the tape indicates a section number and "pages". The tape is 8-level. The 8th bit seems to be used as some sort of end-of-line or end-of-record marker. The 7th bit seems to be parity. So the actual symbol codes are likely 6-bit. I've read in the tapes and done some cryptanalysis but so far I haven't been able to see any patterns that would suggest groupings of letters at certain codes. At this point I'm confused. Does anyone know how Wang paper tapes were encoded, or does anyone know where there is technical documentation about this? So for my searches online have turned up empty. -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

18 years, 11 months

Altair 8800 Layout

by dwight.elvey＠amd.com

Hi You might send directly to this fellow. I suspect that he is not a regular classiccmp( although he should be ). Dwight >From: "Allison" <ajp166 at bellatlantic.net> > >> >>Subject: Altair 8800 Layout >> From: Alex Bihlmaier <thalunil at kallisti.de> >> Date: Wed, 06 Jul 2005 00:43:00 +0200 >> To: General Discussion: On-Topic Posts Only <cctech at classiccmp.org> >> >>Hi! >> >> >> >>I am searching for the layout of an old Altair 8800 home computer. >>A friend of mine is reading Steven Levys "Hackers" and is fascinated >>about the Altair 880 homebrew computer. >> >>I searched the net with google about this computer but i cannot find >>sth. useful. >> >> >>Anyone here with infos about the Altair 8800? > >I have two. A very early 8800 and a later 8800b-t. >There is a huge amount of info on the internet at many sites that >would be a good start. Several also include simulators of the machine. >Then if you have specific questions it will be easier. > > > >Allison >

18 years, 11 months

Altair 8800 Layout

by ajp166＠bellatlantic.net

> >Subject: Altair 8800 Layout > From: Alex Bihlmaier <thalunil at kallisti.de> > Date: Wed, 06 Jul 2005 00:43:00 +0200 > To: General Discussion: On-Topic Posts Only <cctech at classiccmp.org> > >Hi! > > > >I am searching for the layout of an old Altair 8800 home computer. >A friend of mine is reading Steven Levys "Hackers" and is fascinated >about the Altair 880 homebrew computer. > >I searched the net with google about this computer but i cannot find >sth. useful. > > >Anyone here with infos about the Altair 8800? I have two. A very early 8800 and a later 8800b-t. There is a huge amount of info on the internet at many sites that would be a good start. Several also include simulators of the machine. Then if you have specific questions it will be easier. Allison

18 years, 11 months

KVM

by cb＠mythtech.net

>Everyone wants a truck load of $ for KVM switches and I figure for the >price it might be more fun to build one but I've been struggling to >locate a circuit diagram. I figure they're just a fancy switch of some >type. I found an 8 port KVM on ebay with a BIN price of $70 and something like $15 shipping. It was some generic brand, but it was rack mountable and came will all neccessary cables. I know at the time (a few months ago now), the guy had a bunch of them available. They were all listed as new (and mine certainly showed no signs of ever having been opened before). It has worked perfectly for me since I installed it. The only complaint I had about it was the size was a hair too wide for proper rack mounting. It fit inside standard 19" rack rails, but needed to be jammed into place, and then the holes to mount it to the rack didn't line up with the holes in the rails. Less then a milimeter off, but it was enough to keep the screws from going in. (I got around it by first mounting the ears, and then forcing the KVM into place between the ears, and then screwing the ears to the KVM... its in, and works fine, it just took a little effort) The unit only supports PS/2 devices, however I am successfully using it with PS/2 -> AT keyboard adaptors on a few machines. I have no idea if using an auto sensing PS/2/Serial mouse and adaptors at the computer would work thru it or not (I've not tried to do that). If I need another 8, I'd probably buy another one of them without question (it is also daisy chainable, so if I need another 8, I can tie them together and still use just one Key/Mouse/CRT for all 16 devices). Alas, I don't recall the brand name, but if you can't turn it up on ebay just by looking at descriptions, let me know and I'll check the name on Tuesday when I am back in the office. -chris <http://www.mythtech.net>

18 years, 11 months

Fs/ft. Motorola Powerstack, the good-looking version (+ 8" floppydrive)

by roosmcd＠dds.nl

Hello, No idea if it will really fit into the old category, but I'd consider this a classic computer. I've always wanted to have one for the case, but now I simply have too many :). The machine I'm talking about is a Motorola E-series, which looks like this machine (I found the picture via Google, it's not from mine): http://www.hudat.com/~florit/20030624-MotorolaPowerstack/Powerstack-ThreeQu… what I want to sell/trade, are two of the bottom units, with some memory (I think 32Mb, 72-pin) and a sled with cd-rom drive. No Hd's, but I have the OS (AIX 4.1.4 motorola verison, but it also runs NT, linux and solaris). Looking to trade for SGI stuff, Philips CD-i, laserdisc, 100V speakers or ??!?!. greetings, Michiel ps. I also have a nice 8" floppydrive in black external as/400 housing I'd be willing to trade for stuff.

18 years, 11 months

11/45, sick or not?

by dwight.elvey＠amd.com

>From: "Jay West" <jwest at classiccmp.org> > >Joe wrote... >> Are you sure that the lights aren't blinking too fast to see? Perhaps you >> can hang a logic probe (with a pulse extender) on one of the lights to be >> sure. > >I'll try that tomorrow... but I wouldn't think that is what is happening. >Also, pardon my lack of knowledge, but... shouldn't I be seeing the .2v >ripple as an AC component (ie. a sine wave)? It's a very clear perfect >sawtooth. And it's exactly the same on all the 5V regulators, which strikes >me as odd. > >Jay > > Hi Jay No, the ripple on a rectified filter will look like a saw tooth. If you look carefully, you'll see that the leading edge follows the AC while the trailing has a slight dip. This is normal. Dwight

18 years, 11 months

Apple _1_ on ebay???

by wh.sudbrink＠verizon.net

I have not have to time to look at ebay recently. I just did and saw this: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=80286&item=5213140640 &rd=1 Somebody has put an Apple 1 up, it has been there for five days and nobody has mentioned it here??? Is everybody on vacation??? Bill

18 years, 11 months

second call, storage cleanup in boston

by akb+lists.cctech＠imap1.mirror.to

Hi All-- an update on my storage cleanup. I have a lot of CRTs set for recycling pickup come friday; speak now or never... items on the pile: # 3 DEC 21" mono monitor fixed frequency, for a decstation 5000/120 (PMAG-A, I think). # 1 RasterOps 21" Monitor fixed frequency, 1024x768. connector: 5 bnc. sony made trinitron tube. slightly fuzzy focus, sometimes loses horizontal hold; probably loose connection/solder joint. good to fix up or for gaming. # 1 Hitachi 19" fixed freq color monitor, BNC's on the back, this model was commonly used on Sun-3 systems. # 1 IBM 15" color vga monitor # 1 15" mono vga monitor # 1 Canon Canofile 250 document management station # 1 Sun SparcStation ELC I also may dump most of the remaining DEC VR-262 monitors, and the remaining pair of big fixed freq trinitrons, since I don't know how much longer my town will take crt's, and I could really use the space. I'd love a few more takers for decstation 2100's, vaxstation 3100's, and sparcstation 1's. Full list at http://www1.cs.columbia.edu/~bressen/2005-05-too-much-stuff/stuff.html Der Mouse, your MTA doesn't like my identd. It looks 1413 compliant to me... Keith Boston, waiting to hear back from you. John Allain, haven't heard back in a while, I'm assuming you are no longer interested. Other folks, don't worry, I haven't forgotton you. --cheers --akb

18 years, 11 months

upp 103 on ebay

by dwight.elvey＠amd.com

Hi Wow! there is a UPP103 on ebay that is already over $400. It doesn't even have any personality cards in it. I hope that the people bidding on it realize that it won't program anything, listed by the seller, without the right personality card! Being that these have 4001's on them, not many could make such a card. Dwight

18 years, 11 months

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test-drb July 2005