test-drb June 2009

test-drb@ccmp.vtda.org

233 participants
404 discussions

PDP-11 Controller needed to use a couple of RX33 drive

by bqt＠softjar.se

SPC <spedraja at ono.com> wrote: > Mmm... this needs of one BA23, isn't so ? Not neccesarily. The BA23 backplane is also a distribution board for the RQDX controllers. But for the RQDX3 you also have a separate board, called RQDXE (if I remember right) which do the same thing, and makes it possible to use the RQDX3 without a BA23. If you have a BA123 you always need the RQDXE, and if you wanted to use more than one hard drive on the RQDX3 you also need the RQDXE, since the BA23 distribution board is buggy, and can't actually connect two hard drives, even though you have two connections. I think it's worth pointing out that people should never even try connecting two hard drives in a BA23. You'll definitely wreck whatever contents you have on the disks if you try. Another option to use a RX33 would be to get a RQZX1, but that is probably harder to fine, and more expensive. Johnny > > Regards > Sergio > > 2009/6/13 Patrick Finnegan <pat at computer-refuge.org> > >> > On Saturday 13 June 2009, SPC wrote: >>> > > I am searching one controller to use a couple of RX33 in one >>> > > PDP11-23/PLUS. Someone knows what could I use ? >> > >> > RQDX3 >> > >> > Pat >> > -- >> > Purdue University Research Computing --- http://www.rcac.purdue.edu/ >> > The Computer Refuge --- http://computer-refuge.org >> > > -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

15 years, 6 months

Vintage Computers w New Tech. was Re: Hardware Hobbyists vs. Emulator Jockeys

by christian_liendo＠yahoo.com

I am a fan when it doesn't ruin the end user experience. For one thing, I like when old computers can be used with new technologies. Like twitter for the C64. I think that is awesome. I also like when I still see old computers working in real settings, there are people still using old systems and not replacing them. I also like when we can adapt new technologies for vintage computers such as ethernet & flash storage. I think it's great.. I also like flash storage because it reduces the wear and tear on drives. I mean if you like to play with your computer on a regular basis, why wear down the mechanisms when you can dump it all on flash? The technology has to be built in a way so that you don't have to harm the old computer so that if you want to run it the old way, you can. I mean sometimes you want the experience of listening to the grinding of a 1541 drive. --- On Wed, 6/17/09, Jim Brain <brain at jbrain.com> wrote: > From: Jim Brain <brain at jbrain.com> > Subject: Re: Hardware Hobbyists vs. Emulator Jockeys > To: "On-Topic and Off-Topic Posts" <cctalk at classiccmp..org> > Date: Wednesday, June 17, 2009, 12:24 AM > Just because I'm curious: > > How do folks feel about those who are interested in > extending the life of vintage machines by integrating them > with newer technologies?? That's my interest, allowing > both existing and a new class of users to enjoy a vintage > platform by making it easy to utilize the vintage platform > with contemporary ones. > > Jim > >

15 years, 6 months

IBM 3420 tape drive on eBay

by wmaddox＠pacbell.net

The seller has listed just a front panel, but it looks like they have the entire drive. Also, a 3803 controller. The drive looks to be in good shape cosmetically, but are headed for scrap. Item # 250445866736 --Bill

15 years, 6 months

Intersil EPROM

by wdonzelli＠gmail.com

I have a friend that is repairing some video equipment and he needs some *odd* EPROMs. They are Intersil IM6654 (I think) - but they are the obscure 10 Volt variant. He has the chips, but he has not been able to find a programmer that can handle these. Anyone? -- Will

15 years, 6 months

Hardware Hobbyists vs. Emulator Jockeys

by roger.holmes＠microspot.co.uk

On 16 Jun 2009, at 18:00, cctalk-request at classiccmp.org wrote: > From: Eric Smith <eric at brouhaha.com> > > Roger Holmes wrote: >> The IBM 360 was I understand announced in 1965, probably shipped >> quite >> soon after. > > IBM announced the series including six models on April 7, 1964, with > deliveries of small configurations predicted for third quarter of > 1965, > and large configurations for the first quarter of 1966. > > Eric > Thanks for the clarification. So 1964-1959 = 5, 1965.75-1962 = 3.75 and 1966-1962 = 4 so the 360 was around 4 years later that the 1301. Wiped the floor with it though. The only thing 1300 had going for it was sterling arithmetic in hardware. In case anyone's interested the programmer could set a register to the ten shillings position. Digits to the left were normal decimal, the digit itself carried at two, the (shilling) digit to the right carried at 10 as normal, and the next digit (pence) to the right carried at 12, digits further to the right carried at 10, so if you wanted to calculate in farthings (quarters of a penny) you could set it up to have two digits to the right of pence. In all this gave the machine a range of plus or minus 4,999,999pounds 19shillings and 11.99pence, or if you didn't want farthings, plus or minus 499,999,999pounds 19shillings and 11pence, which in 1962 was a LOT of money! The Bank of England had a pair of 1301s. Roger Holmes.

15 years, 6 months

Looking for IMI 5018 MFM drive

by dm561＠torfree.net

----------Original Message: Date: Wed, 10 Jun 2009 12:31:33 -0700 (PDT) From: Fred Cisin <cisin at xenosoft.com> Subject: Re: Looking for IMI 5018 MFM drive On Tue, 9 Jun 2009, Steven Hirsch wrote: > Title says it. Need to replace the drive mechanism in one of my Corvus > flat-cable drives. Firmware expects 6-heads and 306 cylinders and gets > boggled by anything larger, unfortunately. > Could also probably work with Seagate ST419 or Rodime RO203, which are the > only other drives I've found with the same geometry. There were a few more "15 meg" drives with that structure. Sure that you can't fool it into ignoring a few heads or cylinders with a 8 x 306 or 6 x 600? 20 and 30 Meg are a little easier to find. -----------Reply; The 5018 was available with both the 34 pin IMI interface as well as ST-506; I assume you're looking for ST-506. If you *really* can't use anything else I have a few with the IMI interface; the only difference is the top board, so if yours is OK then no problem. There is also a 5021 which, *AFAIK* is the same geometry. mike

15 years, 6 months

am29c111

by emu＠e-bbes.com

Anybody out here has a datasheet, manual or application notes ? Thanks

15 years, 6 months

Hardware Hobbyists vs. Emulator Jockeys (was: Re: UNIX V7)

by mjkerpan＠kerpan.com

Frankly I don't get what this whole fuss is about from either side of the argument. On the one hand, yes, classic hardware is finite and the more people who want it, the higher prices get. But that's the same for ANY vintage item. From baseball cards to Corvettes to classic computers, scaricty is the main driver of pricing for anything that can be collected. But there's also another advantage to people being into classic hardware: greater interest creates more preservation. Unlike, say baseball cards or classic cars, the perceived value of older computers is quite low, except among the dedicated enthusiast community. By expanding the number of people interested in old hardware, the number of old computers picked from the curb at trash day or successfully sold at a yard sale goes up. While this obviously does little to save mainframes and minis, whose owners are usually large corportae and educational institutions that, by and large, have been moving to a common policy where selling hardware for scrap if possible and destroying it before disposal if not are preferable to giving stuff away or even SELLING it to hobbyists, increased interest and awareness in classic hardware can, and probably does, save classic 8 and 16-bit micros from the scrappers all the time. Part two of my rant, about why emulation is also good will have to wait as my shift is over and I need to get home :) Mike

15 years, 6 months

TC08 documentation

by IanK＠vulcan.com

Hi all, I'm troubleshooting a TC08 DECtape controller, and one thing I'm missing is the module 'utilization' (placement) guide that exists in other documentation (e.g. TC01, TU56). It appears from sequence numbers that the online copy of the TC08 Maintenance Manual might be missing that page. Does anyone have a copy that they would be willing to scan? I want to know which G888 is which, i.e. which one serves the mark track, which the diagnostics tell me is not happy. Also, the maintenance guide states that there are values for various settings on the engineering diagrams; no such values appear on the drawings in the appendix to the maintenance guide. Does anyone have the engineering drawings for the TC08? Thanks -- Ian Ian King, Vintage Systems Engineer PDP Planet Project Vulcan, Inc. http://www.pdpplanet.com

15 years, 6 months

All this talk of Unix and other OSes...

by aliensrcooluk＠yahoo.co.uk

Yeah, but from what I have heard it will run alot faster :) Regards, Andrew B aliensrcooluk at yahoo.co.uk --- On Sat, 13/6/09, Eric Smith <eric at brouhaha.com> wrote: From: Eric Smith <eric at brouhaha.com> Subject: Re: All this talk of Unix and other OSes... To: "On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Date: Saturday, 13 June, 2009, 8:09 PM ? ? The 68070 is basically a slightly improved 68000 core (does not have 68020 or later instructions) with a bunch of on-chip I/O.

15 years, 6 months

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test-drb June 2009