test-drb June 2016

test-drb@ccmp.vtda.org

196 participants
290 discussions

by michael.99.thompson＠gmail.com

We fixed the RK05 disk this week. We replaced E3 (LM301A) and E1 (SN7404) on the G938 Servo Preamp module. The COUNT PULSE FWD H and the COUNT PULSE REV H signals from the G938 module are both working now. The drive will now seek correctly using the jumpers described in the Maintenance Manual or using seek-only instructions from the RK8-F controller. We tried the OS/8 and LAPS-DIAL bootstraps, but the processor just halted. The first page of core that was read from the pack contained a repeating sequence of 2525-5252. Either the pack was used as a data-only pack, or diagnostics were run on the pack. During the week I will use SIMH to make a PDP-12 bootable OS/8 RK05 image. Next week we will use dumprest to make an image of the disk pack, and then write OS/8 to the pack. -- Michael Thompson

8 years, 6 months

Model M Key Cap Replacement

by COURYHOUSE＠aol.com

8 years, 6 months

Model M Key Cap Replacement

by COURYHOUSE＠aol.com

Chuck! That would be great! Perhaps yours had newer brains in it than my couple as mine have some years on them. if you still have link to vendor that would be good too. My clicky keyboard is off the tower so it has a long cable on it! I love this keyboard! In a message dated 6/5/2016 11:57:36 A.M. US Mountain Standard Time, cclist at sydex.com writes: On 06/05/2016 10:09 AM, COURYHOUSE at aol.com wrote: > > my real IBM clicky keyboard does not have usb so I tried various > usb adapters and they could be flaky,... you would have to start > computer then have to unplug and reinsert keyboard connection > etc... > > anyone have a solve for this? thanks Ed# I use a no-name cheapie keyboar+mouse adapter that looks like a "y" cable more than anything. Works fine on USB for both. I think I paid about $2 shipped from China. I can get the chip ID if you'd like, but that assumes that you can find another like it. --Chuck

8 years, 6 months

U320 Drives Show up on Wrong Target ID?

by alexmcwhirter＠triadic.us

So in short i have six identical drives. Same manufacture, model, and firmware. Three of them work fine, the other three also work fine but they always show up as the wrong target. For example i have a Sun D1000 storage array with 12 slots (targets 0-11). It doesn't matter what slot you put them in, these three drives always have the same target number. One is target 8, on target 4, one target 2. I doesn't matter one of the drives is by itself or together with other drives. Take the disk that always shows up as target two for example. If you place this drive in slot zero, then place a normal working drive in slot 2, and finally attempt to write data to target 2 both drives will get the write. The same effect also applies to reads. If you boot an OS with the drives in this configuration you will usually get a panic. I can verify the same behavior on my Sum V210 and Dell PE 2850. This is such a bizarre way for a disk to act / fail. Has anyone ever seen this before?

8 years, 6 months

Interesting Material - BOTH on topic and off topic

by jhfinedp3k＠compsys.to

I expect that everyone on this list knows about most of the tools to communicate. Many also use these tools and understand how much easier communication has become as a result. https://uniteyouthdublin.files.wordpress.com/2015/01/here_comes_everybody_p… What is probably not clear is the extent to which these tools have revolutionized how easy it is for groups to be effective. This is the first time I have felt it is useful to draw attention to a book, especially since the PDF can be downloaded so easily for those of you who have the hardware. For myself, I prefer a dead tree version and have been reading the copy I borrowed from the library. Comments on if this book is useful would be appreciated. Jerome Fine

8 years, 6 months

Model M Key Cap Replacement

by COURYHOUSE＠aol.com

my real IBM clicky keyboard does not have usb so I tried various usb adapters and they could be flaky,... you would have to start computer then have to unplug and reinsert keyboard connection etc... anyone have a solve for this? thanks Ed# In a message dated 6/5/2016 5:28:10 A.M. US Mountain Standard Time, chris at micromuseum.co.uk writes: I've been using a Unicomp model M alongside an IBM model M for about a year now and I find there is no noticeable difference between them at all. -----Original Message----- From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Liam Proven Sent: 05 June 2016 12:33 To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> Subject: Re: Model M Key Cap Replacement On 2 June 2016 at 23:45, Ali <cctalk at ibm51xx.net> wrote: > > Does anyone know if IBM produced any Model M KBs w/ post windows 95 keys (I know I know an abomination!)? You know windows key, right click key, maybe power/sleep buttons that would have interchangeable caps? The "Windows" key is the same as "Super" on Sun keyboards, and there's an equivalent for the right-click or "application" key as well. So they weren't MS innovations; actually they were MS /replacing/ keys that IBM's design omitted. As such, my "anti" stance on them has softened considerably. :?) Yes, I believe there are Model-M clones with them. However, one friend bought a Unicomp type clone "Model M" clicky keyboard and both he and I were very disappointed with its build quality. Me, I stick to genuine retro parts. I have a small stock of them -- half a dozen -- which is probably enough for the rest of my life! :-/ The power/sleep key you mention is /not/ a standard key, AFAIK, and no I don't think most clicky keyboards have one. -- 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) --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

8 years, 6 months

11/04 latest

by rodsmallwood52＠btinternet.com

Hi Well lots fun with the 11/94 project. In fact its become an 11/84 and 11/94 project. After following Sherlock Holmes advice "when you have eliminated everything else.Whats left however unlikely is the answer" I discovered the RX211 needed to be in CDEF and not ABCD. Why did I not know that? Well I can only put it down to the fact all of the UNIBUS options I ever worked with were hex modules. Next fascinating fact. You can switch between being an 11/84 and an 11/94. Although one box has three Qbus slots and the other (11/84) has four. If you put an 11/84 CPU in slot 1 and a MSV11-J (PMI) in 2 or 3 it does its startup tests and goes into the monitor screen. If you try to boot the RX02 in 11/84 mode you get (the drive does get accessed - there's a nice healthy clonk) Trying DY0 Error 101 Unexpected trap to location 114 See troubleshooting documentation Updated PC 173260 PCR Page = 62 Program listing address = 062260 R0 = 000000 R1 = 177170 R2 = 042131 R3 = 000000 R4 = 024000 R5 = 000000 R6 = 172276 R7 = 001600 In 11/94 mode it stops at the same point but does not give the error message. Comments gentlemen please Rod Smallwood

8 years, 6 months

VR241 Service Manual?

by robert.jarratt＠ntlworld.com

Does anyone have a VR241 Service Manual? I have looked on Manx and BitSavers, but there doesn't seem to be one available in those places, and a more general search has failed to turn up anything either. Thanks Rob

8 years, 6 months

Re: thinking of the "ultimate" retro x86 PCs - what bits to seek/keep ?

by barythrin＠gmail.com

I'm a bit surprised at the recommendation of Dell but maybe they weren't playing all their proprietary games yet. I've seen where they rewired a nonstandard power connector so you'd fry it replacing it with a standard power supply or fry your other system using one of their power supplies but can't remember if that was at or atx. Seen where they did something stupid and notched their ram so it had to be registered memory. So long ago i don't remember the details though. Not to mention weird custom firmware on parts they didn't build which caused driver and functionality nightmares for 3 sound blaster cards i bought (at a bargain) but had to return all 3 for various odd reasons.? Either way. They quickly became a vendor i lost trust in but maybe lots of vendors also did that and i just ended up working on their problems the most.? Mca and vlb cards are harder to come by and fetch a higher price range vs isa/Eisa or pci.? Definitely stay away from Cyrix processors. Most computer stores i knew in the 486 era wouldn't even sell them or take them as trade ins. Comparability issues and overheating seemed to be common features.? Interesting comments on parallel drives. They're nice for compatability on multiple systems but much slower than their scsi sisters. I did both but didn't realize the huge transfer speed difference until i had traded away my scsi version for a box o' gear then later traded some of that to get a parallel zip drive again. But on the bright side most of my systems could use it or share it over null modem.?

8 years, 6 months

Resurrecting the DB-19

by lproven＠gmail.com

June 4, 2016 ? 10 comments *DB-19: Resurrecting an Obsolete Connector* Oh man, this is good! You?re looking at the first DB-19 connector to be made in the 21st century... http://www.bigmessowires.com/2016/06/04/db-19-resurrecting-an-obsolete-conn… -- Sent from my phone - please pardon brevity & typos.

8 years, 6 months

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test-drb June 2016