test-drb April 2006

test-drb@ccmp.vtda.org

200 participants
412 discussions

by dgy＠DakotaCom.Net

Hi, I've got an oddball SCSI controller card that I would like help identifying (actually, I have several *different* ones but we'll start with this one :> ) Card is full length. PCI. Appears to be made by IBM (FRU 76H6875). Has three AIC-7880's on it connected to three "internal" wide SCSI-2 connectors -- and a single external connector presumably tied to one of these three busses. Onboard PowerPC and what appears to be a connector for a flying CF card. A pair of 10 pin headers one of which has a "SERIAL" legend nearby. A third header labeled JTAG (no doubt for manufacturing diagnostics). External connector appears to be LVD or SE (bummer, I was hoping to find a HVD in this box of goodies...) I'll assume it's a RAID controller. But, question is how well (if at all!) it is supported and whether it is worth my time or if I should just toss it in the box and dig out the next "mystery card"? Thanks! --don

18 years, 8 months

Sticky tapes

by aek＠bitsavers.org

> I'm now wondering about streched band That is EXACTLY your problem. The tensioning belt isn't tight enough any more and as the tape rolls it goes slack. When it stops at EOT, it folds over itself, and often creases the tape, creating a bad spot that you hit on every pass. I have had to replace 100+ belts as I've been reading all of my tapes. Pretty much any tape from the mid-80's earlier will have a bad belt. Sometimes they're so bad they snap on the initial retension (you do know you have to retension the tape before you try reading it, don't you?) Scotch DC450+ carts from the early 90's have been my primary source of donor belts. The bad news is the piles of surplus carts that were all over Silicon Valley in the late 90's are pretty much all gone now..

18 years, 8 months

P?S/8 (was 4k/8k PDP-8 OSes)

by aek＠bitsavers.org

There is a history of Lasner's P?S/8 up at http://www.idkcomp.com/p?s.html What I was wondering is if P?S/8 is available anywhere..

18 years, 8 months

Sorting large box of 72 pin SIMMs - looking for chip ID guide

by lee＠geekdot.com

> Unfortunately, two evenings of googlings has only found me > consumer-level guides to help clueless PC owners tell SIMMs > from DIMMs - nothing at the chip level. Strange, my first google hit gets this .. http://www.chipmunk.nl/DRAM/ChipManufacturers.htm Lee.

18 years, 8 months

Sticky tapes

by compoobah＠valleyimplants.com

It's not what I thought it was- looks like the tape "emulsion" is fine. The looping only seems to happen when the tape gets to the end and is ready to rewind. Listening to the tape, it sounds almost like there's some slack or slippage, but the cartridge seems tight when I look at it (take it apart, poke and prod, etc. The tapes that I'm having problems with (both trapped loops binding the tape and plain read errors) are noticeably noisier than trouble-free cartridges. I'm now wondering about streched band or lubrication issues (they have a much duller surface than newer DC600/DC6150s).

18 years, 8 months

AViiON 3000

by dgy＠DakotaCom.Net

Hi, I've inherited a 3700 so my 3000 is now looking for a use :-/ I expect to get DG/UX running on the 3700 (when I have some spare time to deal with those issues). It would seem wasteful to also install that on the 3000. I figure I can fill the 3000 with drives and glue other peripherals onto it and turn it into a "media machine" (i.e. support many different types of tape, disk, etc.) and file server. Choice of OS to install on it becomes an issue. It's a quad Pentium box so ideally something that supports SMP. I would *like* to find something that can support blocksizes != 512 (for my MO drives). I'd also like to find an OS that would let me treat the multiple drives as a single *big* drive (e.g., DG/UX supports virtual drives that can span multiple physical drives) so I can set up a nice /distfiles filesystem. The box will run headless. Suggestions? --don

18 years, 8 months

Did the Technology Rewind Come Out?

by jrkeys＠concentric.net

Did I miss it for this week?

18 years, 8 months

Altair front panel measurements

by rcini＠optonline.net

All: I'm putting the finishing touches on my replica Altair 8800 front panel and I need to find out how much the LEDs stick out from the front of the metal dress panel. Would someone be kind enough to measure this for me? Thanks. Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: <http://highgate.comm.sfu.ca/~rcini/classiccmp/> http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/

18 years, 8 months

Programmer's conundrums

by cclist＠sydex.com

I recall that one test we'd use on new assembly language programmers on the CDC 6000 series was a routine to save the contents of all of the registers without using an exchange jump. It's much harder than it appears to be at first. No register assumptions like B1=1 allowed, either. Are there any similar tasks on other architectures that try a programmer's mettle? Cheers, Chuck

18 years, 8 months

sticky tapes

by compoobah＠valleyimplants.com

I'm working to image some of the CV tapes from the CADDStation before they fade away, and I'm running into a problem with "sticky tapes". They're not losing the coating, they're just sticking to something and catching, requiring dissasembly of the tape cartridge (QIC) before they will run again. One had an extraneous loop when I popped the cover. The two that I have done this with so far imaged fine after I messed with them, but is there a way to fix this to start? I'm not even sure about the etiology. Is the "baking" from the HP tapes thread likely to help? The tapes that have a manufacturer's mark are 3M DC300-XL/P All date from about 1988.

18 years, 8 months

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test-drb April 2006