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101090 discussions

Marquette "MUSE"--DEC mini/file server circa 1986-88

by ip500＠roanoke.infi.net

Anyone know anything about the above captioned computer??? It's a beast! Big HEAVY! upright tower system 27" tall X 27" deep with a HUGE power transformer in the bottom of the case. Model D171. Main components are DEC Backplane marked "H9275A", processor card "M8192" bunch of other non-DEC cards in there as well--SIGMA, EMULEX, couple of unmarked ones. Powers up, HD blinks, has a built in tape drive. Did a search for Marquette and they are now GE/Marquette--medical/EKG,EEG monitoring stuff. Is this some sort of rebadged DEC system or a totally custom ie: worthless medical gadget....looks promising. Thanks, Craig

25 years, 11 months

XXDP+ LL Formatter on RX50/RX33

by pete＠dunnington.u-net.com

On Apr 17, 12:15, Jeffrey l Kaneko wrote: > On Mon, 17 Apr 2000 12:35:56 -0400 (EDT) allisonp(a)world.std.com writes: > > > Has anybody ever ripped the Low Level formatter > > > from the XXDP+ diskpack and put the needed components > > > onto a floppy (of some sort)? [...] > > It's doable. You need to create a bootable XXDP disk and copy the > > required formatter to it. not much more than that required. > > I figured as much; I was just probing to see if anyone had already > done it. Yes, DEC did: ZY003P3 Field Service Tests disks for the microPDP-11 series, contains 4 Field Service Test RX50's (CZXDnB0 where n = 1...4) and a CZUFB1 disk which has the monitor, menu, help text, UPD2 and assorted tests including ZRQA?? and ZRQC?? I've also got a pair of rather later XXDP 2 disks from 11/53 systems, which have XXDPXM, XXDPSM, DRSXM, DRSSM, DIR, assorted drivers, UPDAT, XTECO, DXCL, SETUP, HELP. One disk also has ZRQA??..ZRQF?? and the other has VDHA??..VDHE??, VMSA??, ZTKA?? and ZTKB?? -- Pete Peter Turnbull Dept. of Computer Science University of York

25 years, 11 months

8-bit IDE

by allisonp＠world.std.com

>Frankly, the reason I'm exploring this is because with the 8-bit mode, I >don't have to buffer the data at all beyond the on-board data-in and data >out buffers at the bus interface. The board I'm using to host the thing is handy but that feature is not there. >From what I read in the standard, this is a normally selectable operating >mode for the interface. What's more, only the smallest of drives would be >appropriate for CP/M on the S-100, since CP/M supports, at most, 120 MB, Actually it supports 16 drives of 8mb each for CP/M 2.2 and 32Mb for CP/M3. P2dos, Novados, SuprBDOS all support files to 32mb and drives to 1gb. BUT, the logical drive to physical drive map does not have to be static. For example you could only have drives C/D/E/F as mapped to 8mb logical drives. Drive C: could be partition 1 and a fixed mapping. Drives D/E/F could be mapped to floating partitions anywhere on a very large drive. I supported two 71mb MFM drives this way back in 87 under CP/M2.2. >handle that much. Back when I used CP/M every day, I owned the largest hard >disk system on CP/M that I'd ever seen, at 44MB. Obviously you've never seen many of the systems I ran or have aquired. Likely the 44mb limit was based on inavailability of really large drives. Even my AmproLB has a 45mb SCSI on it and I plan to bump that up to a 160mb. The current system I'm building I'm planning will have IDE 250mb drive. Space is handy as I can have a 8mb partition for pascal and another for C or whatever. >notebook drives should cost about $5-10, which is acceptable. Clearly, There are plenty for under 25$. Though you have to decide on 9.5mm, 12mm or 17mm thick models. Allison

25 years, 11 months

RRD40 terminator?

by cmcmanis＠freegate.com

Hello all, I've got an interface to an RRD40 in my VAX called a KRQ50 and it has two "ports". One connects to the RRD40 with a 15 pin or so cable, the other, I don't know. Then in the box of stuff that went with this is a terminator (green LED on the back) with the same D-shell connector as the RRD40. So I'm trying to figure out whether or not they went together. I've never seen such a terminator before. --Chuck

25 years, 11 months

XXDP+ LL Formatter on RX50/RX33

by CLASSICCMP＠trailing-edge.com

>> > I'm contemplating attempting to do this myself, >> > but in case it's been done already, I'd just as >> > soon as not re-invent the wheel. >> >> It's doable. You need to create a bootable XXDP disk and copy the >> required formatter to it. not much more than that required. >I figured as much; I was just probing to see if anyone had already >done it. Sure. Do you just want the RQDX3 utilities on it? Up until a year or two ago, DEC would sell you a subset of XXDP on RX50's that included the things commonly used on Micro-PDP's. They don't have any RX50's left in inventory, though. >BTW-- Are RL02's a maintainance nightmare? Do the advantages >of these drives outweigh the problems (not to mention their *size*, >or are they simply not worth it? RL02's are, IMHO, the most reliable of all the 14" removable cartridge drives. The embedded servo design means that absolute positioning alignment does't have to be done. (Though the relative alignment of the two heads does matter somewhat.) The head flies pretty high over the platter, so crashes are rare. I know one site that ran a bunch of RL01's (mechanically very similar) continuously for twenty years before upgrading to RL02's, and the only problems they had were the spindle bearings wearing out. And they aren't very big or heavy either. They're less than 70 lbs each, so they're easy to move around. The big Massbus drives, those are a different story. -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927

25 years, 11 months

XXDP+ LL Formatter on RX50/RX33

by jeff.kaneko＠juno.com

Guys: Has anybody ever ripped the Low Level formatter >from the XXDP+ diskpack and put the needed components onto a floppy (of some sort)? I'm contemplating attempting to do this myself, but in case it's been done already, I'd just as soon as not re-invent the wheel. I'll need the formatter used with the RQDX3. BTW-- Anybody have the docs for the DSD-880? Info on this would be most appreciated. Jeff ________________________________________________________________ YOU'RE PAYING TOO MUCH FOR THE INTERNET! Juno now offers FREE Internet Access! Try it today - there's no risk! For your FREE software, visit: http://dl.www.juno.com/get/tagj.

25 years, 11 months

test post

by stuart＠zen.co.uk

test Stuart Birchall ----------------------------------------- Network Consultant Zen Internet http://home.zen.co.uk Tel: 01706 713714 x 217

25 years, 11 months

PS/2 memory

by PeksaDO＠Cardiff.ac.uk

Speaking of PS/2 memory, can anyone shed any light on the following MCA memory card: Made by Quadram. There are various stickers: [908503] [02790487][REV 1B] [K.B.] [9080R1] [9081R1] [9079R2] The [908503] sticker obscures an etch number 17-9085-[908503]R1 There are four 30pin SIMM slots furthest from the back plate, each containing a 1Mbyte SIMM. I've searched the web but can't find any info. There are three 3pin jumpers (marked J1, J2, J3) and one toggle switch on the back plate. I've assumed that the jumpers set the starting address/size and that the toggle switches it off and on but can't see any extra memory (even after trying various combinations) in my PS/2 model 80. Doug.

25 years, 11 months

8-bit IDE

by allisonp＠world.std.com

>As it happens, the committee did standardize on the one mode bit that makes >the interface an 8-bitter. How extensively that was adhered to remains to >be seen, I guess. Well wishful thinking had me check it out using several 85-130mb drives (quantum, Seagate, maxtor, WD) and none seem to do that. After all having that would make the interface a no brainer and save a simple silo for splitting read and writes. However, it was wishful thinking. As to doing it on S100, been there done that. the interface logic needed to do the bus does 3/4s of the work and it only needs a bit more the close the loop. CPLD/FPGA/PAL could cover most of that but for S100 I like real TTL (244/241/373) like parts and NO cmos where the bis interface occurs. Allison

25 years, 11 months

8-bit IDE

by CLASSICCMP＠trailing-edge.com

>> I personally like the CMOS much better since it drives harder, and since it >> pulls and pushes with the same impedance, unlike TTL which sinks 16 and >> sources 1.6 mA. I've tried replacing all the bus interface buffers on my >> old S-100 cards with AC logic. In some cases I used HC or AHCT (SAMSUNG) >I've seen latchup on busses that ring negative using HC and HCT parts. >I'd like the better drive but they would randomly flame on me due to the >bus ringing. Obviously loading the bus with terminators would solve this >but it's still something that worried me and made for a less robust card >for handling and ESD. Is the cheapness of IDE drives worth all the heartache of the cable length and funny line driver limitations? The cable length limitations are so short that you've almost got to put the hard drive in the same box as the CPU - this isn't good if you want expandable or flexible systems! But if "cheap" is the main requirement, I suppose it's OK. Maybe I'm too used to dealing with systems where the hard drive might be 60 or 100 feet away from the CPU... (differential SCSI and SMD.) Tim.

25 years, 11 months

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