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101090 discussions

DEC Rainbow 100B For Sale, Manchester, UK

by robert.jarratt＠ntlworld.com

I have a DEC Rainbow 100B in the upright pedestal for sale. It comes with 128K of memory, a hard disk controller with hard disk cable, an RX50 drive and the graphics option. It is just the base unit and the pedestal, there is no keyboard, monitor or hard disk included. I collected this machine recently and had to replace the shorted EMI filter on the input of the PSU with something more modern, so it is a working machine. When I have been given a machine for free that I can't keep, then I give it away. In this case, this one cost me money to buy and repair, so this time I am selling it. I would much prefer collection as it is quite large. If I must ship it then so be it, but it may take me a while to find a suitable box to ship it in, and I may have to add that to the cost. Pictures here: https://onedrive.live.com/redir?resid=FC758A5A91B91301!5858 <https://onedrive.live.com/redir?resid=FC758A5A91B91301!5858&authkey=!AC9g74 Lag3CoW5k&ithint=folder%2cjpg> &authkey=!AC9g74Lag3CoW5k&ithint=folder%2cjpg Looking for offers. Regards Rob

10 years, 1 month

making music with pdp 11/40

by billdegnan＠gmail.com

anyone make music with the pdp 11/40 or UNIBUS system similar to the PDP 8e music? I was able to get a basic tone pattern into the AM radio today. Not sure how to "write" music, but it's a start. Bill -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>

10 years, 1 month

S/360 Model 30 (?) FS in NC

by jnc＠mercury.lcs.mit.edu

Oooh, if I didn't have an _extremely_ strict rule about 'only PDP-11's' (to prevent my house filling to the gills, and my wife divorcing me :-), I'd be all over that. Someone definitely needs to grab this up! Noel

10 years, 1 month

Y Combinator is restoring one of Alan Kay's Xerox Alto machines

by lproven＠gmail.com

http://www.righto.com/2016/06/y-combinators-xerox-alto-restoring.html Found via: http://www.osnews.com/story/29261/Xerox_Alto_restoring_the_legendary_1970s_… There are 2 videos up so far, with disassemblies that may interest CCmpers. Some people from the list are involved, including Al Kossow, but I haven't seen the link posted. -- Liam Proven ? Profile: http://lproven.livejournal.com/profile Email: lproven at cix.co.uk ? GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lproven at hotmail.com ? Skype/AIM/Yahoo/LinkedIn: liamproven Cell/Mobiles: +44 7939-087884 (UK) ? +420 702 829 053 (?R)

10 years, 1 month

S/360 Model 30 (?) FS in NC

by COURYHOUSE＠aol.com

I still have the aluminum bar that says 360 30 that was on the top of the system here in phx. I bought early on in my computer business life segment. Aside from being part of a memento for me and sort of interesting sitting in a glass case... it may need to find its way back atop a 360/30 someday. Ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 6/25/2016 10:57:07 A.M. US Mountain Standard Time, aek at bitsavers.org writes: Maybe a 2841 disk controller, but the 360/30 panel has been pulled. Hard to say what is really there. LCM may be interested in parts for their 360/30, and Will Donzelli has been looking for a 2841 On 6/25/16 10:06 AM, Chuck Guzis wrote: > http://www.vcfed.org/forum/showthread.php?53014-IBM-360-with-additional-era… > > --Chuck > ------------------------------------------------------------- > > "The first thing we do, let's kill all the spammers." >

10 years, 1 month

S/360 Model 30 (?) FS in NC

by cclist＠sydex.com

http://www.vcfed.org/forum/showthread.php?53014-IBM-360-with-additional-era… --Chuck ------------------------------------------------------------- "The first thing we do, let's kill all the spammers."

10 years, 1 month

ACARD ARS-2000SUP versus SCSI2SD - round 1

by swiftgriggs＠gmail.com

Tested using "Raw block speed" test in LIDO 7 under MacOS: [SCSI2SD v5] READ: 891 KB/s WRITE: 728 KB/s [ACARD ARS-2000SUP] READ: 1621 KB/s WRITE: 1277 KB/s More info: The ACARD device contains a Samsung 850 Pro 128G SSD. The SCSI2SD contains a Samsung Pro+ 64GB micro SD and is running firmware v4.6, IIRC. Both are were attached to a Quadra 700 Macintosh running System 8.1 with 68 megs of RAM (4 onboard + 64MB in 16MB SIMMS, the max on the Quadra 700). I had them hooked up at the same time so I could use one to partition the other. The hard disk "driver" was the one provided by LIDO, but I also tried LaCie SilverLining 5's driver as well, but the performace was slightly worse. I tested in LIDO using it's raw speed test feature. It's probably only a rough measure of sequential speed. I just tested three times and averaged the results, but it was within just a few KB/s each time. Once I'm done I'll hook both of these up to a FreeBSD box, dd off full backups, then start over again and try with ZFS under FreeBSD via a PCI SCSI controller. Then again under IRIX if I still have the energy. I'll give some results from 'fio' or 'iozone' under FreeBSD. Those will be a lot more detailed and break down sequential versus random results and show the results of various other permutations. I'd also like to test the SCSI2SD v6, but I can't get my hands on one, yet. The only place that talks about the v6 is the codesrc wiki and the American ebay retailer seems to only have the v5.0. I'll wait, I guess. -Swift

10 years, 1 month

Current source for RX50 media?

by ethan.dicks＠gmail.com

Hi, All, A friend of mine who is mostly into Sun equipment recently purchased a MicroPDP-11 from a State auction. He knows little about DEC gear, but I can help him there. His machine had the RD5X drives pulled by the State, but still has an RX50. Where can I point him to get a handful of RX50 floppies? I can help him with contents to put on them, but he needs media. He's likely to start with RT-11. He could probably use 10-20 floppies to start. Thanks, -ethan

10 years, 1 month

VR241 Stray Wire

by robert.jarratt＠ntlworld.com

I took apart my VR241 recently to see if I could find the reason why the screen doesn't go completely black. I took lots of pictures while doing so, to make sure I could put it back together again correctly. However, now that I am putting it back together, there is one wire which looks like it wasn't connected. It is on the deflection board (on the right when looking from the back of the CRT). I am not sure now if I missed taking a photo of this when it was connected, or if it really should be not connected. There is a pin marked Size Link near to it, which might be where it has to go, and sounds like an optional thing if that is the case. You can see the wire in question at the bottom of the picture below, it is the green wire with a single-pin connector on it, and the size link connector is the two-pronged connector just below it in the photo: https://1drv.ms/i/s!AlQc3lJwQx7bgbAJQx-HsvGY8Gcqsg Anyone know where this wire should go? Regards Rob

10 years, 1 month

options for replacing failed small ROMs in PDP-11

by fritzm＠fritzm.org

Hi All, In bringing up and debugging my PDP 11/45, I found that one of my GRA (M8101) spares has a failed ALU subsidiary ROM. It's a pretty standard little 32x8 ROM in a 16-pin DIP, and the truth table is in the 11/45 print set. I wonder what the replacement options are for parts like these? In particular, given the 30ns micro-cycle on the KB11-A, and the fact that the propagation time for the ALU downstream of this is roughly 20ns on its own, I'd be worried that an off-the-shelf bipolar PROM might be too slow here. I'm still a little slow on reading the microcode flows, so its not clear to me exactly how many micro-cycles there are on the critical path for the E-class instructions where this ROM is used. Maybe its not an issue. Anybody every try replacing one of these with a bipolar PROM? Any other suggestions for how to repair parts like these? cheers, --FritzM.

10 years, 1 month

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