test-drb April 2015

test-drb@ccmp.vtda.org

182 participants
220 discussions

Video grabber, for NTSC type video signals

by jws＠jwsss.com

The heart of this is a sync chip. I'm wondering if someone has any ideas about perhaps using such to grab the video from IBM Mono, CGA, EGA or the sun mono type video monitors to name a few. I would love to be able to have a device which grabs these video frames, and converts them for graphic display or capture, rather than having to have a physical monitor around for each of these. This is a fairly economical board, and would be easy to justify using it with any system to convert the video, as well for a bench device. Any suggestions for a way to convert these to VGA, or even better where things seem to be going for DVI would be useful. thanks Jim Nootropicdesign Video Experimenter. http://nootropicdesign.com/ve/

9 years, 3 months

Adafruit EGA (I think) from arduino

by jws＠jwsss.com

I think what they are doing here is driving an EGA monitor in CGA mode with an arduino. That seems to be a handy thing to have in an old computer bag of tricks. i'd also like to have a circuit to grab semi static video off of CGA or EGA ports into Arduino. I'll post another bit with a sync generator shield for Arduino for that purpose. You may need to be on Google plus to get the following. I'll post the text below the Adafruit link which is mentioned in the post. https://plus.google.com/+adafruit/posts/fWau8XPRpWo *CGA Output to IBM Enhanced Color Display from Teensy 3.1* https://blog.adafruit.com/2015/04/14/cga-output-to-ibm-enhanced-color-displ… Benjamin Gould made this cool project with his CGA monitor using Teensy via paradigm lift /A while back, while hunting for an IBM PC AT Model F keyboard, I came across a Craigslist ad that said something like ?IBM Model 570 computer for sale with monitor and keyboard, $50?. I realized that it was probably a typo and that they meant Model 5170, which was the IBM PC AT. To make a short boring story shorter, the keyboard with the system was a 1986 Model M instead of Model F, but by itself was worth more than $50 anyhow so I lugged the whole thing home and sold the keyboard to cover the cost. I set the PC and monitor aside for a while until I became curious if you could drive the monitor with a microcontroller, and I came across this post on //hackaday.com <http://hackaday.com>//./ /Research/ /The aforementioned post featured a project by a hacker who was able to get a signal from his Arduino Uno to show up on a CGA monitor. His demonstration only had horizontal lines, which is much easier than sending individual pixels. Still, his proof of concept project was very encouraging and gave me a great jumpstart on the timing calculations that I would need. Here?s some quick notes regarding the scanning:/ /? The pixel clock for CGA was 14.31818 MHz. Take the reciprocal of that i number (1/14318180) to find that it takes about 0.06984 microseconds (?s)./ /? CRT display has electron emitting beams that are rapidly moved across a phosphor screen to create an image. At the end of each line the beams are turned off as they move back to left side of the screen and down 1 pixel. After the last visible horizontal scan line they are also turned off long enough for the beams to retrace vertically./ /? In between each horizontal and vertical scan, a synchronization signal is emitted as well. For CGA, there are dedicated HSYNC and VSYNC lines that carry these signals./

9 years, 3 months

Vintage PDP-8 manuals on eBay

by jnc＠mercury.lcs.mit.edu

This person: http://www.ebay.com/sch/recollect74/m.html is selling a bunch of vintage PDP-8 manuals for low starting bids. Noel

9 years, 3 months

HP 3000 series 947 and HP 700/92 monitor for sale

by shawn-gordon＠cox.net

tower style On 4/15/2015 5:44 PM, Jerry Wright wrote: > Is this the rx or sx One is a cube rack mount, the other a tower style > - Jerry > > > On Wednesday, April 15, 2015 12:51 PM, Shawn Gordon<shawn-gordon at cox.net> wrote: > > > southern california, near Irvine specifically. I can ship, but that will > add to the cost for shipping supplies and the shipment. > > On 4/15/2015 12:36 PM, Jim Carpenter wrote: > >> On Wed, Apr 15, 2015 at 3:30 PM, Shawn Gordon<shawn-gordon at cox.net> wrote: >> >> >>> The monitor is in perfect condition other than some dust. The computer looks >>> great, but there is something wrong with it, I don't know what. I don't have >>> the exact specs here, but I'm getting married and would like to clear some >>> stuff from the house. If someone is interested in one or both of these items >>> for a modest price plus shipping, I'd like to hear from you. >>> >>> >> Location??? >> >> >> > > > >

9 years, 3 months

HP 3000 series 947 and HP 700/92 monitor for sale

by shawn-gordon＠cox.net

southern california, near Irvine specifically. I can ship, but that will add to the cost for shipping supplies and the shipment. On 4/15/2015 12:36 PM, Jim Carpenter wrote: > On Wed, Apr 15, 2015 at 3:30 PM, Shawn Gordon<shawn-gordon at cox.net> wrote: > >> The monitor is in perfect condition other than some dust. The computer looks >> great, but there is something wrong with it, I don't know what. I don't have >> the exact specs here, but I'm getting married and would like to clear some >> stuff from the house. If someone is interested in one or both of these items >> for a modest price plus shipping, I'd like to hear from you. >> > > Location??? > >

9 years, 3 months

HP 3000 series 947 and HP 700/92 monitor for sale

by shawn-gordon＠cox.net

The monitor is in perfect condition other than some dust. The computer looks great, but there is something wrong with it, I don't know what. I don't have the exact specs here, but I'm getting married and would like to clear some stuff from the house. If someone is interested in one or both of these items for a modest price plus shipping, I'd like to hear >from you. Thanks, Shawn

9 years, 3 months

HP-C product HP92453-01 version A.08.81

by kevenm＠reeltapetransfer.com

I'm doing a little re-engineering. I'm looking for HP-C product HP92453-01 version A.08.81 I suspect it could have been on HPUX 10.20. Wondering if anyone may have access to something from back then and could check the version on the C compiler - just to verify what OS version. I can invest in an HP9000/712 system with 10.20 installed, but not sure about the C compiler that would come with it. Thanks, Keven Miller

9 years, 3 months

Burroughs B1900 for sale in North Carolina

by tosteve＠yahoo.com

I'm not connected with this person or equipment, just passing-on the info. Contact travis.uzzell1969 at gmail.com for more info. See these pictures - it's a little "rough" http://oldcomputers.net/temp/IMG_5164.JPG http://oldcomputers.net/temp/IMG_5165.JPG http://oldcomputers.net/temp/IMG_5167.JPG http://oldcomputers.net/temp/IMG_5168.JPG http://oldcomputers.net/temp/IMG_5169.JPG http://oldcomputers.net/temp/IMG_5170.JPG http://oldcomputers.net/temp/IMG_5171.JPG

9 years, 3 months

UK PDP11 wanted

by jnc＠mercury.lcs.mit.edu

{Replies to all three recent posts bundled together to reduce list traffic; hope that's OK...} > From: Glen Slick >> Actually, the PMI signals are all (I'm pretty sure, but have not >> checked) just like most other QBUS signals - 'broadcast' >> bi-directionally down a transmission line. > when PMI memory boards are installed above and adjacent to the M8190 > CPU the PMI signals are bused through one PMI memory board to the one > above and adjacent to it At a low level, yes; but I'm trying to understand PMI at a higher level - one that applies across _all_ backplanes, including the 11/84 backplane, which is a purer implementation of 'PMI is just another broadcast bus'. > From: Johnny Billquist >> PMI signals are all (I'm pretty sure, but have not checked) just like >> most other QBUS signals - 'broadcast' bi-directionally down a >> transmission line. I checked (Micronote #30, 11/84 Tech Manual) and this is basically correct; all the additional PMI signals are implemented as bi-directional transmission lines (although some are only used uni-directionally, e.g. PMAPE, PUBSYS, etc). The UNIBUS adapter does use the BDMG and BIACK lines, which are uni-directional grant lines, but they are both actually QBUS signals. > But because of the way the CD slots are wired, it cannot be a general > broadcast thing. Repeat previous reply to Glen... >> My impression is that the CPU does not get involved in DMA access to >> PMI memory. > This is one thing I'd like to check though. And I think this is my > point of worry... I couldn't find any 11/83 manuals online. There is a User Manual for the KDJ11-B, and it indicates (Section 1.6.1) that DMA devices can become QBUS masters and do any normal data transfer over the QBUS, which I take to mean that the CPU is not involved (other than to do the initial arbitration). Section 7.3 confirms this. >> I'm pretty sure that whether PMI memory works as PMI memory or QBUS >> memory depends only on what it hears on the busses, and nothing else. > The memory works as PMI or plan Qbus memory simply based on where it is > located in relationship to the CPU Again, that's looking at one special case (the Q/CD backplane); I'd rather look at PMI in a more general way. > From: Pete Turnbull > QBus non-PMI memory does work (as QBus memory) if placed before the CPU. That part I was pretty sure about (given the way the QBUS works). The part I didn't know was whether an M8190 would work correctly with a mix of PMI and non-PMI memory. I wonder what it does - does it start a PMI cycle, and then convert to a QBUS cycle when the PMI doesn't happen? Or does it somehow scan for both types during startup, and have some sort of configuration table that it relies on thereafter? I didn't see anything in either the KDJ11-B or KDJ11-E User Manual, and there is no KDJ11-x Tech Manual that I could find. Noel

9 years, 3 months

large lot of PC computer magazines period 1987-2000 available in Germany

by p.gebhardt＠ymail.com

Hi list, a friend of mine has for give-away a large lot of magazines from the years 1987 to 2000. They are mostly complete I was told. The magazines are "PC-Welt", "PC-Magazin" and "DOS". Located in the region called "Hochsauerlandkreis" Contact me off-list and I can give you the direct contact to him. Kind regards, Pierre ------------------------------------------------------------------------------- Pierre's collection of classic computers moved to: http://www.digitalheritage.de

9 years, 3 months

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test-drb April 2015