test-drb April 2013

test-drb@ccmp.vtda.org

205 participants
273 discussions

by tlindner＠macmess.org

Gary Becker is running a Kickstarter project to create a CoCo 3 replacement motherboard. I'd really like to get one, but it needs more support. http://kck.st/16fAwkf -- tim lindner

11 years, 8 months

OT: manual (was: Re: 8mm Movie to Digital Service?)

by mtapley＠swri.edu

At 10:40 -0500 4/25/13, tony wrote: >...'Manual of Sub-Standard Cinematography'... I have a sudden vision of a book containing only two words: "American television" -- - Mark 210-379-4635 ----------------------------------------------------------------------- Large Asteroids headed toward planets inhabited by beings that don't have technology adequate to stop them: Think of it as Evolution in Fast-Forward.

11 years, 8 months

DG Desktop Generation Manual

by mark.darvill＠mac.com

Tommie, Many thanks for the suggestion regarding the guy on ebay. Bruce has also contacted me directly off list. Mark ------------------------------ Message: 22 Date: Tue, 23 Apr 2013 17:44:23 +0200 From: Tommie Mademark<tommie at fox.se> To: "'General Discussion: On-Topic Posts Only'" <cctech at classiccmp.org> Subject: RE: DG Desktop Generation Manuals Message-ID:<40A791DCA605FE468794FC2AE63FA2041EFC827D09 at mail.fox.se> Content-Type: text/plain; charset="us-ascii" Signature emlmth1 on eBay.com has a set of 5.25 inch diskettes with AOS install for sale. The floppies are currently not listed but he had them listed a few months back for me, but I was looking for AOS/VS on diskettes, not AOS. Bruce Ray (bruce at Wild-Hare.com) might have the "Desktop Generation Model 20-30 Technical Reference" manual. Tommie Mademark My Data General bloghttp://DataGeneral.org/

11 years, 8 months

Kaypro System disks?

by brain＠jbrain.com

I have been fortunate to acquire a Kaypro system that appears to be in great condition and looks to work. It looks exactly like this: http://www.computermuseum.li/Testpage/Kaypro-I-Micro.htm Thus, it says Kaypro 1 on the artwork Still, the sticker on the rear says Kaypro 2, so I'm confused. In any event, I have no system disks for it (There is a slight possibility they are part of the stash with which the Kaypro was bundled, but it's 100 sq ft of stuff). Thus, I'm wondering if there is a kind soul who might be able to ship me a set of disks. (I'll pay shipping, of course). I also am the proud owner of 2 Obsorne machines (one works, the other seems to have drive issues. They are the redesigned units, but (as I suspected) the systems disks won't work on the Kaypro. Jim -- Jim Brain, Brain Innovations (X) brain at jbrain.com Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! Home: http://www.jbrain.com

11 years, 8 months

CMD CQD-220 ROM fixes

by fraveydank＠gmail.com

A while back, I mentioned that I'd found and potentially fixed the "bricking" problem with the CQD-220. To recap, for those that werent following, the problem lies in the code for the on-board 8086 when you set the number of both disks and tapes to zero. The 8086, during its routine to load the values from the EEPROM, loads the total number of disks and tapes and executes a loop with a counter predecrement; if the counter is loaded as 0, it effectively runs through the loop 256 times instead of 7 (the max), which spins out of control and blows away some RAM somewhere before crashing. Fortunately, through a compiler bug or some such, there are 5 bytes available from a totally redundant instruction (loading a value into a register where the same value is already loaded) in just the right place to test the total number of devices and jump to the "uninitialized device table in EEPROM" section of the routine if it is zero. With one byte to spare! (good thing NOP is only a byte in 8086) This applies to the A7A revision of the ROM, anyway; I haven't gotten to the A8 version yet, though I know it exhibits the same bug. Hopefully it also has the same redundant instruction. In any case, I should be able to find and fix it quickly once I have the time, because I know where to look. So, here's the thing; I've finally gotten the time to test the fixed ROM image (was temporarily short of 27256 chips, but that's been resolved) and I'd like to get the fixed images somewhere they'll be easy to find if anyone else runs into the same problem (this took me over a year of sporadic attention to fix). Does anyone know where I should post this? There's my own website, which is really not a thing anymore, but there are probably lots of places Google is more likely to find. Also, are there copyright implications to consider? I know CMD is long gone, but I still worry about these things. Last thing: does anyone know the difference between the A7A ROM and the A8? I've not found anything different; I assume it's probably an obscure bugfix. The images are only 64K total, so I shouldn't imagine they'll be bandwidth intensive. - Dave

11 years, 8 months

Mac Performa 6400/200VEE

by jules.richardson99＠gmail.com

I found a Mac Performa 6400/200VEE at the dump today, but no keyboard / rodent / display. It seems to have 128MB of RAM installed, along with a video I/O board (the 'VEE' bit, I suppose) and Ethernet board. The downside is that there's some significant battery corrosion toward the bottom of the system board PCB. I'll try some vinegar and see how it goes, but obviously it doesn't make sense to source a keyboard, mouse and display from anywhere if the system's toast. 1) Is it possible to wire the 15-pin monitor connector up to a PC's VGA monitor? Or, 2) Can I hook the composite out on the video I/O board up to a TV and expect to be able to see something at boot time? (I'm not sure if that board's only initialized after the system's booted) Done with hard disk disconnected, obviously - but will the system even output anything to the display with no keyboard or mouse present? cheers Jules

11 years, 8 months

What's this 88000 based qbus cpu about ?

by seefriek＠gmail.com

As it happens, I have one of these with manual and VMS drivers/libraries. Nothing currently to put it in, though. KJ

11 years, 8 months

Northstar C5 Bus - Any interest or any details on what this is?

by arrowrunner＠gmail.com

A member from the vintage computer forum suggested that I post this here before throwing it in the scrap pile. I'd much rather make a couple dollars or trade and see it go to someone that might use it or need it anyway. http://s253.photobucket.com/user/arrow_runner/media/20130408_175701_zps5d7b… http://s253.photobucket.com/user/arrow_runner/media/20130408_175710_zpsb4ff…

11 years, 8 months

8mm Movie to Digital Service?

by Arno_1983＠gmx.de

ard at p850ug1.demon.co.uk (Tony Duell) wrote: > > Stupid question but do those films (8" or 12") have sound on them > > I am puzzled by your reference to 8" and 12" here.... Probably referring to the reel size, which is of minor importance. > like a track or are they purely video slides in a row? (I've really > never seen them up close so hollywood is my only incorrect knowledge of > how it looks). > AFIAK 16mm cine film could have either an optical soundtrack or a > magnetic one. In the former case, the ausio signal modulated a light > source which produced a variable width or density track on the film. http://en.wikipedia.org/wiki/Film_soundtrack has an example of a 16mm film with variable width/area sound track. I haven't been able to quickly find a reference picture for the variable density (sometimes called "Western Electric") system, but it consists of density gradients along the sound track (think "analogue bar code"). Magnetic sound track gives itself away as a strip of brownish color (like audio cassette tape) that is laminated onto the film along one edge. Sometimes there is a second "balance" strip along the other edge so the film will spool up more evenly. > After processing this was read using a lamp and photocell, the signal > from the latter was the original audio. Or a magnetic soundtrack, an > iron oxide 'stripe' down the film which works like a tape recorder. All three systems were available for 16mm film, my Siemens System 2000 projector would be capable of playing them all back. There is a switch at the amplifier (in the projector base) to select between optical and magnetic audio and a knob on the optical reading head to select width or density modulation. > Super-8 8mm film could have a magnetic soundtrack (I have never heard of > opticla sound on such films). I have also never heard of any soundtrack > on standard 8 ('double run 8(') or single-8 film. http://en.wikipedia.org/wiki/Super_8_film#Sound has the following: "Super 8mm was also specified with an optical sound track. This occupied the same location as the magnetic track. Picture to sound separation in this format was just 16 frames. Projectors and cameras obviously could not record sound in this system, but optical sound package movies became briefly popular, particularly in Europe (mainly because they were cheaper to produce - though the projectors cost more). Although the optical sound should have been inferior in quality to magnetic sound (running at 3.6 inches per second for 24 frames per second), in practice it was often much better, largely because packaged movie magnetic sound was often poorly recorded." No mention of audio tracks in any form in the Regular-8 article however. Arno

11 years, 8 months

Mark Crispin and PANDA

by spedraja＠ono.com

Hello. What happened with the PANDA distribution available in PANDA.COM ? The site appears to be down. Regards Sergio

11 years, 8 months

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test-drb April 2013