test-drb May 2004

test-drb@ccmp.vtda.org

244 participants
500 discussions

by jkunz＠unixag-kl.fh-kl.de

Hi. All this talk about frontpanel emulators... So I have this (mostly) working PDP-11/34, my one and only UniBus machine. It came with a RK07 drive. But the system was stored under bad conditions for years. There is rust and corrosion _everywhere_. The machine works so far but the drive is quite rotten. I have no other UniBus disk drive interfaces so I need either a new RK07 (unlikely) or a replacement for the entire conroler / drive combination or: What about a RK07 drive emulating hardware? A microcontroler with some TTLs to interface to the RK611 controler on one side and a compact FLASH card on the other. Maybe cache RAM in front of the FLASH to reduce write cycles to the FLASH. 32 MB is enough for a RK07 disk, even if the emulator stores raw data including all sector headers / trailers. Problem: Exact and detaild specs of the RK611 <=> RK0[67] interface. I found some hints in the "RK06/RK07 Disk Drive User's Manual" but not enough to build a new drive from scratch. Any pointers? -- tsch??, Jochen Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/

20 years, 8 months

New pictures; UYK-20 Computer Core Memory

by rigdonj＠cfl.rr.com

I just finished adding some pictures of the core memory boards from the UYK-20 to my website at <http://www.classiccmp.org/hp/UYK-20/>. This <http://www.classiccmp.org/hp/UYK-20/back.jpg> is a picture of the back of one memory card with a 3.5" floppy disk laying on it for size comparision. This <http://www.classiccmp.org/hp/UYK-20/top.jpg> is a picture of the top. The core is under the green cover. Here is a close-up of the Sperry Univac logo on the memory board. And finally, here <http://www.classiccmp.org/hp/UYK-20/core.jpg> is a picture of the core itself. You can get an idea of the size of the core area in comparision with the 3.5" floppy disk in the LH edge of the picture. The green over comes off very easily. Just remove four screws and it slides off. Lyle Bickley send me a couple of PDF files about the UYK-20 and I've posted them on the same webpage. Joe

20 years, 8 months

HP computers / test gear in Chicago

by jpl15＠panix.com

Scanning thru a newsgroup, I happened on this: http://chicagotest.i8.com/BigSale.html If you look at the pictures, there are several HP desktop calc/computers underneath alll that other Stuff... website says most everything will be in the $10 - 30 range - this coming Saturday, the 22nd. Might be some Rescue Opportunities Cheers John

20 years, 8 months

Beehive: was Lear Siegler ADM3 terminals

by Innfogra＠aol.com

I think Beehives are much more rarer than ADMs of any kind. Beehives were highly sought after by my scrapper as they had an aluminum case and good cards. He actively sought out Beehives as one of the best terminals to scrap along with the early Sorocs and went out of his way to search them out. As a result there are few Intel ones in PDX. ADMs survived by having very poor scrap values and high disposal costs for the plastic case. Paxton Astoria, OR

20 years, 8 months

Elektor and OSI's OS-65D (was OHIO-DOS)

by sarkis＠mslabo.com

bonjour moi aussi jai un c4p avec la carte 502 sans lecteur de disk et je cherche lr os65d ou os65u pour un branchement de sa400 cordialement sd

20 years, 8 months

Lear Siegler ADM3 terminals

by sloboyko＠yahoo.com

These terminals are very nice; I have a brown one and a blue one. One part that always breaks or is missing is the flap on the front for the DIP switches. I made aluminum plates to fit in the recess. Both of mine had seriously burned in CRT's; I put in new ones I got for about $40 each shipped (I hate this kind of work, but I did it) and now they look and feel new. I opted for B/W for "originality", although I could have gotten green phosphor at the same price. One didn't have the lower case option; the chip for lower case is hard to find. So I copied the ROM out of the ADM-3 with lower case (2kx8, strange voltages and pinouts, a 2513-type ROM), blew a 2716, and made a little adapter to plug into the other ADM-3's 2513 socket. This, two 2102-1 RAMs, and a few flips of dip switches gave me lower case! Absolutely hideous matrix, but very authentic! ===== -Steve Loboyko Incredible wisdom actually found in a commerical fortune cookie: "When small men cast long shadows, then it is very late in the day." Website: http://juliepalooza.8m.com/sl __________________________________ Do you Yahoo!? SBC Yahoo! - Internet access at a great low price. http://promo.yahoo.com/sbc/

20 years, 8 months

Nonvolatile RAM on single board computers

by dwight.elvey＠amd.com

Hi I usually make copies on two diferent media. I make a copy on another similar device and also a 3.5 floppy. I keep these with the unit. Have you played with the SBC any? What kind is it? These are always interesting to collect because of the chalenges of locating software and documentation for them. I've been known to connect up a switch panel to a uP socket and use this to determine the addresses of ports and memory. I did this on a 80C186 machine and implemented a Forth on it so that I could play with it. Development boards are also fun to play with. I have a few of these. Later Dwight >From: "SHAUN RIPLEY" <vax3900(a)yahoo.com> > >I have a SBC with nonvolatile RAM on it. There are >DRAM and EPROM too. I guess the nonvolatile RAM might >be used to hold some important parameters while EPROM >is used to hold program. > >Since nonvolatile RAM has limited life, I wonder how >you guys deal with nonvolatile RAM in your old >computers. Reading out the content with a EPROM >programmer is a solution that jumps into my mind. >"Burn" a new nonvolatile RAM and wait for another 10 >years? It seems a boring work... > >vax, 3900 > > > > >__________________________________ >Do you Yahoo!? >SBC Yahoo! - Internet access at a great low price. >http://promo.yahoo.com/sbc/ >

20 years, 8 months

AT-AO-6/10

by CGUARDIA＠VENTURAFOODS.com

Do you still have any of these for sale?

20 years, 8 months

Nintendo GameBoy a valid discussion topic now?

by cb＠mythtech.net

>While digging around in the basement last night I found my old Nintendo >GameBoy, with a 1999 manufacture date. That makes it 15 years old. >Does this now make it a classic? > >The interesting thing is that the old 1999 GameBoy games will play in >my six year old's brand new 2004 Gameboy Advanced SP. Shall we presume you meant 1989, or are you counting in a different base? 1999 - 2004 is 5 years, not 15. -chris <http://www.mythtech.net>

20 years, 8 months

New pictures; UYK-20 Computer and Millennium uProcessor System tester

by dwight.elvey＠amd.com

>From: "Joe R." <rigdonj(a)cfl.rr.com> > > I've added some more pictures to my website. The first ones are of one >of the UYK-20 computers. These were made by Sperry Rand and are militry >versions of the Univac and use core memory. ><http://www.classiccmp.org/hp/UYK-20/>. The other pictures ---snip--- Hi Joe Does anyone know what processor model was used for these? It would be great to power one of these up and actually program one. It looks like a 16 bit machine. Dwight

20 years, 8 months

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test-drb May 2004