test-drb August 2005

test-drb@ccmp.vtda.org

227 participants
528 discussions

DEC computing stuff up for sale. (early '80s)

by fireflyst＠earthlink.net

Got a bunch of classic computing junk up for sale, here it is: DEC RL02 Disk drive x2 - $150 ea RLV12 controller and cable - $30 with drive purchase only H9644 chassis with side panels and back door, and trim pieces for RA82 setup - free for local pickup DQ130 Pertec disk controller - free with purchase, no cabkit DEQNA adapter, unknown revision - $10, no cabkit BA11-SE expansion chassis with cover and expander card in it - $75, clean unblemished faceplate. Rack mount SCSI expansion chassis, with partial side rails, $60, very nice piece See something you like, make me an offer. These are asking prices

19 years, 4 months

DECDLD usage -good enough for minimal graphics?

by ISC277＠CLCILLINOIS.EDU

Hello everyone! I was just investigating the usage of DECDLD for defining a small graphic screen on my PDP11 during a program. When using a VT220 at 19200 baud, how fast can a screen be refreshed using DECDLD graphics? I was thinking of doing a multiplayer (4 player) game using this system.

19 years, 4 months

VCF Suggestions (film vs. digital cameras)

by Watzman＠neo.rr.com

Re: "I reckon that a good 35mm camera (good meaning a top-end lens and fine grain film) is equivalent to 12-20 megapixels." My understanding from the camera companies, which I've heard more than once (and going back to 2000, before any such digital cameras existed) is that they consider 35mm film about the equivalent of 6 megapixels. It's not exact, as it depends on what image sensor (not all image sensors of the same megapixels are the same) and what film (not all 35mm films are the same, either). The lens obviously enters into overall image quality in a big way, but that is equally true for both film and digital cameras. But bottom line, as a rule-of-thumb, and other things (in particular the lens) being equal or at least comparable, I consider (and a lot of experts consider) that about a 6 megapixel camera is the equivalent of 35mm film.

19 years, 4 months

Advent Systems?

by julesrichardsonuk＠yahoo.co.uk

Can anyone shed any light on this? Box of 8" soft-sectored floppies, box labelled "Advent Systems LTD.". Floppies inside: Paint (2 disks) POS G601 Advent users Rectify Utilities Doclayout Docdraw Designer Skan Image compression Manual fonts Roman fonts Rockwell fonts Megaron fonts Map rectify I suspect they might be PERQ disks due to the mention of POS and the fact that there are PERQs on the site where I got them. It'd be nice to confirm that though - googling for anything related to Advent turns up all sorts, and as there are a million and one other flavours of machine on the same site there's no guarantee they're anything to do with PERQs at all. cheers Jules

19 years, 4 months

collection of TTL/CMOS chips, can anyone help identify?

by brian＠quarterbyte.com

Hi all, A local second-hand store got a bunch of TTL and CMOS chips, maybe 500 pieces in all. It's kind of odd -- some are in original retail bags, some are in old glass medicine bottles with corks. Someone's basement workshop collection, I guess. I looked through them, wrote down some numbers. They're selling them for about $3 per dozen for the ones in larger quantities. Anyone interested in MM5262 2K dynamic RAMs? Loads of these, in original retail plastic bags (antistatic? I think not). These are interesting, I'm going to pick these up for projects: 8642 quad bus tranceiver? 8836 single-ended bus receiver (Unibus?) 8838 quad bus tranceiver (Unibus?) MM5311 digital clock 5371 digital clock, 4 digits, 50 Hz 5781 programmable controller or calculator? MM5780 (2 digit toy calculator?) MM5799 4-bit microcontroller 5841 serial shift input, 8 bit NPN drivers (50V, 500 MA) (if this is really what they are, they're really fun) Anyone have any info on the M5799? These look like TTL. Anything of special interest in this list? 8092 dual 5-input NAND w/2 inv. inputs 8094 non-inv function buffer gate (if National, DM) 8136 6-bit identity comparator 8601 single RC timer? 8664 7 segment decoder/driver 8796 General purpose Mask Prog ROM (no idea what version) 8806 4-input AND function gate? (if SE/SL/NE) 8828 Dual D flipflop? 8856 programmable counter 8880 Hi volt 7 seg decod/driv 74174 Hex D FF 74181 TTL ALU function generator Others, can not determine what they are. Any ideas? I can go back and try to get manufacturer letters: 5737 ??? 5782 ??? 7504 ??? 7506 ??? 7515 ??? 7517 ??? 8096 ??? 8098 ??? 8670 ??? 8681 ??? 8817 ??? 16254 ??? 60769 ??? 141097 national semi, no idea These seem pretty common, not worth bothering with: 4016 CMOS quad bilateral switch 4019 CMOS quad 2-input mux 4021 CMOS 8-bit shift reg 4049 CMOS hex inv buffer 4066 CMOS quad bilateral switch MM5221 mask prog. ROM (no idea what's on them) Brian

19 years, 4 months

VCF suggestions... (film vs digital)

by vp＠cs.drexel.edu

Scott Stevens <chenmel at earthlink.net> wrote: > ard at p850ug1.demon.co.uk (Tony Duell) wrote: > > You do realise I paid less than that for my monorail camera. The > > [...] > You can buy a 4x5 'digital back' for that camera. > [...] > You'd also be dealing with 450MB images for each shot. EXACTLY! That is what Tony has been saying all along. You can't get good quality pictures with digital cameras UNLESS you want to spend a fortune for the equipment AND deal with the huge data files. By contrast film combines very high resolution, compact physical dimensions, low cost, AND long life. If you add that you do not require any additional complex supporting equipment to VIEW the images [1] then you must agree that film is the best medium for images you want to enjoy for a long time. Having said that, I do not use film because I prefer the convenience of digital photographs. But I understand the tradeoffs and do not go about telling people that my equipment is better than film or that I produce images that can compete with film. **vp [1] compare this with the CDROM or DVD drive that you will need to read the data, plus an understanding of the encoding/format of the directory structure on the disk and finally the encoding used for the images. Before you say smth about jpg, note that for high quality pictures you would want to keep them in their native (proprietary) raw format. Given the hell that people are having to go through to recover data from old media, there is no doubt in my mind that people will NOT be able to view the digital images they take today, unless they are willing to devote a lot of effort to preserve them by migrating them to new storage and encoding technologies as these are introduced. BTW what are you doing to preserve your VHS tapes? Remember VHS equipment are disappearing fast from the retail market and, in any case, the ones made today will not last for more than a couple of years anyway.

19 years, 4 months

Diablo 30 power

by ard＠p850ug1.demon.co.uk

Joe, (I think) was asking about power for the Diablo Model 30 disk drive (DEC RK02/RK03). I had a chance to look in the manuals on bitsavers today. The Model 30 Maintenance Manual (not the parts list), gives the pinout of the power connector. I'd forgotten one detail, there are 2 connections for each of the +15V and =15V lines, one for the high-current, noisy, stuff (like motors), one for the low currnet, sensitive, stuff like the read amplifier. You should use separate wires for each connection and only join them at the PSU output terminals. There's also a maximum length of power cable, something like 5'. I don't see why this would be a major problem in any sane system layout. Oh yes, these drives take up to 8A (!) on the +/-15V lines. The PSU manual _is_ on bitsavers, I think. It's the Model 29 manual in the samre directory. No, this is not obvious, I was just looking at various manuals. The DEC PSU is, I think, electrcially different, though. -tony

19 years, 4 months

DECDLD usage -good enough for minimal graphics?

by ISC277＠CLCILLINOIS.EDU

19 years, 4 months

VCF Suggestions (film vs. digital cameras)

by dwight.elvey＠amd.com

Hi The only issue here is that it also depends on the camera lens. I have a small lens Olympus C50 with 5 MegPix and a 10D Canon. There is no question about which has the sharper pictures. The 10D can be blown up 2 to 2.5 times bigger. So pixel count is not 5.0 vers 6.3. Dwight >From: "Barry Watzman" <Watzman at neo.rr.com> > >Re: "I reckon that a good 35mm camera (good meaning a top-end lens and >fine grain film) is equivalent to 12-20 megapixels." > >My understanding from the camera companies, which I've heard more than once >(and going back to 2000, before any such digital cameras existed) is that >they consider 35mm film about the equivalent of 6 megapixels. It's not >exact, as it depends on what image sensor (not all image sensors of the same >megapixels are the same) and what film (not all 35mm films are the same, >either). The lens obviously enters into overall image quality in a big way, >but that is equally true for both film and digital cameras. But bottom >line, as a rule-of-thumb, and other things (in particular the lens) being >equal or at least comparable, I consider (and a lot of experts consider) >that about a 6 megapixel camera is the equivalent of 35mm film. > > > >

19 years, 4 months

Driver for an old ISA board

by teoz＠neo.rr.com

Anybody have drivers for an old Mr. Ramgrab/AT ISA video capture device? Think its 1994 vintage.

19 years, 4 months

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test-drb August 2005