test-drb April 2015

test-drb@ccmp.vtda.org

182 participants
220 discussions

Looking for a MOS Kim-1 for sale or trade

by mail.nickallen＠gmail.com

Looking for an EARLY MOS KIM-1 computer, let me know if you are interested in trading for it, or selling it, thanks! -Nick

9 years, 7 months

DEC scanned documents for Bitsavers (message for Al Kossow)

by jnc＠mercury.lcs.mit.edu

> From: shadoooo > I'm scanning at 600dpi grayscale, lossless compression. I've been scanning a few things too, and I found that 600dpi grayscale produced absolutely enormous files (many, many MB's per page, for prints), no matter what I tried to do, compression-wise. 600dpi black and white, followed by saving as TIFF's with CCITT Group 4 compression, produced immensely smaller files (small 100's of KB's for the same pages), and they are quite readable (even the fine letter seems to be readable - b/6 is quite distinguishable, etc). Al, I hope that's acceptable for BitSavers - I have a number of things that are missing, and I was planning on scanning them in, and sending them along. Noel

9 years, 8 months

Two new IBM DOS scans

by silent700＠gmail.com

Not that DOS...DOS! I have scanned two docs, "DOS System Control and Service" and "DOS Messages." They can be found here: http://chiclassiccomp.org/docs/index.php?dir=%2Fcomputing%2FIBM%2FMainframe… and would seem to belong here, if aek would like to add them: http://bitsavers.trailing-edge.com/pdf/ibm/360/dos I will probably find more in this set as I work through the stacks. Enjoy! -j

9 years, 8 months

Hand-wired core for ROM?

by jnc＠mercury.lcs.mit.edu

> From: Brent Hilpert > Core rope ROM has one magnetic core per the word-width of the memory. > That is, a memory of (say) 1024 16-bit words would have 16 cores. Not always (although your basic point, that in core ROM, a single core is often/usually used for more than one bit, is a very key point to note); the Apollo rope ROM had one core per 192 bits, or 12 words of 16 bits each, "thousands of ... cores" per memory rope. See: http://web.mit.edu/digitalapollo/Digital%20Apollo%20Annotated.doc and there's a picture of one here: http://klabs.org/mapld04/presentations/session_g/g1007_hall_s.ppt (see slide #15). Those notes do contain an interesting aside: "rearrange the program's fixed-memory allocations to avoid cases where such sets of 12 words contained too many ones to fit in their cores", which implies that the cores were fairly small, physically (since a one involved running the wire _through_ the core, not around it). I don't know why they didn't make the cores larger, and have fewer of them; my suspicion is that in manufacturing terms, it was easier to have more of them, with less wires through each one. (I can't think of an _electrical_ reason to do so; unlike with RAM cores, where smaller cores are faster to switch, and take less power to do so.) Noel

9 years, 8 months

IBM 5160 oddball fault

by jules.richardson99＠gmail.com

I picked up a (known-faulty) 5160 a few weeks back, just because it had a keyboard with an intact decal, and the one on my otherwise-perfect system is missing. The machine came with a CGA card, which I've tested as working in my other 5160. Symptoms of the fault are one long beep and two short beeps at power-on, with 1024 characters of garbage displayed on-screen (typically either a solid block or a space, but with a handful of other random chars) - i.e. 12 rows of 80 and then a row of 64. Following this on screen, at location 13,64, the memory count occurs, and then it'll drop to ROM BASIC (no hard disk, and for the purposes of testing I've not bothered with a boot floppy), with the BASIC startup text starting at row 14 and all offset by 64 characters from the left margin. However, the function key reference on the bottom line of the display is OK, starting at position 25,1. I can issue BASIC commands, and each new line is offset by 64 characters, until I hit the bottom of the screen, at which point text appears at position 1 (but still offset from the top of the screen by 13 lines). Issuing a 'cls' doesn't remove the garbage from the display, and typing then resumes from location 13,64. Throughout all of this the cursor seems to appear where I'd expect it on the screen, however - I'm assuming it's done via hardware entirely within the CGA card. I've tried pulling all other cards, leaving just the CGA board, and the problem persists. One long and two short beeps seems to be 'video failure', but as mentioned I've verified that the card works in my other 5160. Does anyone have any ideas what might be going on? It doesn't quite seem like a memory fault - possibly some sort of address decoding error? It's almost like the video board is pulling display data from the wrong part of memory, but I'm not sure that makes sense given that the board has its own local RAM rather than relying on RAM on the system board. cheers Jules

9 years, 8 months

DEC scanned documents for Bitsavers (message for Al Kossow)

by shadoooo＠gmail.com

Hello Al Kossow, I'm scanning a bunch of documents. Many of them aren't not listed on Manx, and shouldn't be already loaded on bitsavers. I'm scanning at 600dpi grayscale, lossless compression. I could upload the documents somewhere in original RAW format, or already deskewed, converted to TIFF BW bitmap. I would contribute to Bitsavers, please contact me offlist for details of upload. Unfortunately I don't have a server, and the raw documents are heavy. Thanks Andrea

9 years, 8 months

Pile Of Computer Stuff Up For Grabs (Mid Atlantic)

by fsmith＠ladylinux.com

Hiya, I have posted this in the past but I hate selling things but really that is selfish on my part and some of my interests have shifted. I need to move some items from the "Dust" and into the light from my collection. Its all stored in my climate controlled clean basement. I have mostly Dec gear although there are sprinkles of other stuff such as Kaypro's , Osbournes etc ... No blinken lights machines but some PDP's such as the 11/23 etc along with some Vaxstations and Alphas. The prices will be cheap and geared towards putting this into hands that can use them over people wanting a quick flip. I will not ship although anyone who wants to work with someone to pick up a pile and ship it is more than welcome. I am in the mid atlantic area and can be contacted via my gmail address ladylinux4u at gmail dot com. Thanks!! Fran --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com

9 years, 8 months

In search of DEC H7140 (PDP-11/40 power supply) parts

by JoshD＠LivingComputerMuseum.org

I'm working over at the Living Computer Museum in Seattle and we're attempting to revive a PDP-11/44 for use in a project. At some point, someone stripped the power distribution panel from the 44's H7140 power supply (this is a small PCB that connects to the power supply terminals and provides molex power connectors for standard UNIBUS backplanes (or other backplanes). Anyone happen to have one of these distribution panels (or failing that, a complete supply) going spare? Thanks! Josh Sr. Vintage Software Engineer Living Computer Museum www.livingcomputermuseum.org<http://www.livingcomputermuseum.org> (206) 342-2537<tel:%28206%29%20342-2537>

9 years, 8 months

IMSAI chassis color/texture...

by philip＠neoncluster.com

Once I get home, I could probably cross reference with a pantone color for you. > On Apr 23, 2015, at 2:38 PM, Bill Sudbrink <wh.sudbrink at verizon.net> wrote: > > I remember a conversation about this subject from many > years ago that never came to any conclusion. Has anyone > discovered any "paint codes" or other definitive descriptions > for the finish on the upper case of an IMSAI? I'm thinking > of having my worst case (multiple scrapes and scratches, > several permanent stains) refinished. > > Bill S. > >

9 years, 8 months

Hi and what are these?

by cctalk＠v6y.net

Hey everyone, I am new to the list, have a collection of 60's and 70's hardware I am slowly selling, but these have me stumped (I am not an expert in vintage computing): http://imgur.com/0SHTT9A http://imgur.com/lJXbLjf http://imgur.com/uPasyFE http://imgur.com/W3eHes1 http://imgur.com/A5GuF4Z http://imgur.com/Wp2jKOb http://imgur.com/KEiE9It http://imgur.com/okDQVJQ Anyone know what either of them are called or what system(s) they go to? Sometime in the next month or so, I will be auctioning off a complete (working) Data General Nova 2, along with a few other very rare (from my searches on this list) big items. Thanks! -Justin Keogh http://www.ebay.com/usr/jkeogh0

9 years, 8 months

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test-drb April 2015