Re: Attaching DEC Handles, the Right Way

On 4/26/17 10:02 AM, jim stephens via cctalk wrote: > > > The boards bend up or down in the center of the card > as you pull very hard on each edge. fortunately, Alto cards have steel bus bar/stiffeners at the edge connector end that keeps that from happening. do you know of anyone that

ISO Matrox Multibus SX-900 graphics card manual

on a whim I bought http://www.ebay.com/itm/142363021266 640x480x8 Multibus graphics board with 80286 and NEC 7220 apparently they were commonly used in process control, a fair number turn up at absurd prices

Re: Remex Tape Reader - Pre-power up advice?

On 4/16/17 11:28 AM, Anders Nelson via cctalk wrote: > Hi guys, > > I recently impulse-bought a paper tape reader from eBay, a Remex > RRS6500BE1/660/DRB/U901 Tucker had a copy of the RRS6500 series manual A scan is now up at

Re: Diablo 3x pictures

On 4/28/17 9:13 AM, Tony Duell wrote: > On Fri, Apr 28, 2017 at 5:10 PM, dwight via cctalk > wrote: >> I'll have to give mine a look. I hate that foam. > > There seem to be 2 types. One turns to a sticky goo, the other turns to > dust. I refer to them both as 'Evil

Re: Diablo 3x pictures

On 4/28/17 9:00 AM, Al Kossow via cctalk wrote: > The door latch and load lamp is driving me nuts. Dug out my extender card > this morning > to try and figure out why the driver transistors aren't turning on. Quick work once I could probe the IC pins. A gate on the J2 card w

Diablo 3x pictures

Was working on some Drives this week, and took some pictures of it disassembled. http://bitsavers.trailing-edge.com/pdf/diablo/photos/Diablo_33F/ The prefilter was orange crumblefoam. I took a look at my NOS ones and they have a greenish prefilter that still appears to be OK. The gasket going up

Re: IBM 5280

On 8/4/17 9:23 AM, Al Kossow via cctalk wrote: > weird, it doesn't look like I scanned these. I thought I did.. I did, it's under "528x" but OS X collation puts it with 3 digit part numbers (grrr..)

Re: 2.11BSD on two RL02 drives? Probably not, but...

On 8/4/17 11:14 AM, Warner Losh via cctalk wrote: > most SD cards can easily handle 100-200 writes The issue would be things like the swap partition on a unix disk or whatever the equivalent is under RSX

Re: IBM 5280

and we do have a 5285 http://www.computerhistory.org/collections/catalog/102633515 I need to see if that floppy in the picture is still in the left-hand drive On 8/4/17 11:34 AM, Al Kossow via cctalk wrote: > I just uploaded GA21-9353-1_5280_Functions_Reference_Manual_Apr81 w/o

Re: 2.11BSD on two RL02 drives? Probably not, but...

On 8/4/17 10:34 AM, Phil Blundell via cctalk wrote: > On Fri, 2017-08-04 at 09:17 -0800, David Bridgham via cctalk wrote: >> > So my question is: do industrial SD cards exist? > > Yes they do. Most of the big card manufacturers have an "industrial" > range, for example: > >

Re: IBM 5280

utils, and DE/RPG I'll see if I can get to those this weekend. On 8/4/17 9:23 AM, Al Kossow via cctalk wrote: > > > On 8/4/17 9:20 AM, Al Kossow via cctalk wrote: >> https://halsoft.wordpress.com/2008/06/02/the-next-generation-key-punch-the-ibm-5280/ >> >> http://www.comp

Was there ever a final version of the Altos ACS 8600 users manual?

I just uploaded a bunch of ACS 8600 documentation to bitsavers, but the Users manual I have is preliminary from 1982. Does anyone have a later version that has the missing chapters (esp the schematics Appendix)?

Re: Sperry UTS 40 on Ebay - Statesboro, Georgia

On 7/28/17 10:02 AM, Dominique Carlier via cctalk wrote: > Maybe I'm wrong, I always believed that the J3 connector was an RS-232 port. > Here it is: > > http://www.zeltrax.com/classiccmp_forum/04.jpg That also shows there is a firmware cartridge :-(

Re: Sperry UTS 40 on Ebay - Statesboro, Georgia

On 7/28/17 10:49 AM, Dominique Carlier via cctalk wrote: >> That also shows there is a firmware cartridge :-( >> > > Is it specifically a bad thing from your point of view ? Why ? Do you think > eproms could be damaged over the years? it will just make the firmware more difficult to dump

Re: 1/2 tape in Bell ESS5

http://www.tape-replacement.com/support/lucent-at-t-5ess/ I've seen M4 Data 9914V drives configured for 48v and At part numbers https://en.wikipedia.org/wiki/5ESS_Switching_System On 7/30/17 11:53 AM, Pete Lancashire via cctalk wrote: > Anyone know the spec s for the tape drives in a ESS5

Re: homebrew PDP-11 bus adapters - was Re: PDP-11: DR11-C to FPGA or 1284?

Another stillborn project? I don't see any software to make the Beaglebone talk Unibus On 8/1/17 9:39 AM, Toby Thain via cctalk wrote: > I just saw this a few minutes ago... > > https://trmm.net/Unibus > > > --Toby

Re: Sperry UTS 40 on Ebay - Statesboro, Georgia

They canceled my order as well, just after sending me a message wondering if I wanted the keyboard I hope they just relist it On the other hand, this isn't the same as your unit, the connectors on the back are in a different place and I don't see the 9 pin keyboard connector so this may be a

Re: Sperry UTS 40 on Ebay - Statesboro, Georgia

On 8/1/17 8:41 AM, Al Kossow via cctalk wrote: > I hope they just relist it jackass relisted it for $1000, still w/o keyboard www.ebay.com/itm/142462575631

Re: Sperry UTS 40 on Ebay - Statesboro, Georgia

On 8/1/17 10:49 AM, Noel Chiappa via cctalk wrote: > Any guesses as to what's going on? sellers not getting the prices they wanted.

Re: WTB: RX02 Floppy Disks

correct that was how I've always low-level formatted RX02s, using 3rd party controllers. On 8/2/17 9:46 AM, Jay West wrote: > Eric (via AEK) wrote > -- > "RX02 format uses single-density address fields even for double density. The > RX02 can "reformat" standard single-density

Re: Sperry UTS 40 on Ebay - Statesboro, Georgia

On 8/1/17 11:25 AM, jim stephens via cctalk wrote: > > > I would not void a closed > sale either if I couldn't help it. But that's just me. Like I say most people agreed up until this year. I've had more bad deals or people just canceling my bid and closing auctions with 'item no longer

Re: WTB: RX02 Floppy Disks

ok, got this clarification from Eric Smith "RX02 format uses single-density address fields even for double density. The RX02 can "reformat" standard single-density into RX02 modified MFM format just by rewriting all of the data fields. It still can't low-level format a blank or MFM disk." So

Re: RX8 M8357 Device address.

On 8/9/17 9:23 AM, Josh Dersch wrote: > The manual I linked contains configuration details for the RX01, RX8E and > RX11. See page 2-10. yea, just pulled the manual and realized that, sorry.

Re: RX8 M8357 Device address.

it is device code 75 http://homepage.divms.uiowa.edu/~jones/pdp8/man/rx01.html On 8/9/17 9:24 AM, Al Kossow via cctalk wrote: > > > On 8/9/17 9:23 AM, Josh Dersch wrote: > >> The manual I linked contains configuration details for the RX01, RX8E and >> RX11. Se

Re: RX8 M8357 Device address.

On 8/9/17 8:32 AM, Josh Dersch via cctalk wrote: > On Wed, Aug 9, 2017 at 8:00 AM, Rod Smallwood via cctalk < > cctalk@classiccmp.org> wrote: > >> Hi Lis >> >> It looks like RX8 SEL is not asserted due to the device address not being >> set up on the DIP switches. >> >> Anybody know what they

Re: Whole IBM System/34 available in unknown condition

On 7/25/17 4:53 PM, Ian S. King via cctalk wrote: > I thought the point of going to scrap was that > the scrapper makes money on the metals, and pays you for that privilege. We have trouble getting ecyclers to even come here to pick stuff up. Most of the time I have to drive stuff to Weird

Re: 2.11BSD on two RL02 drives? Probably not, but...

On 8/4/17 7:07 AM, Christian Corti via cctalk wrote: > If you really want a non-rotating media, then I > suggest that you use SATA SSDs. Can you actually buy SATA PHYs in small quantities now or even SATA to PATA bridges? I remember looking for them in the past and either not being able to buy

Re: 2.11BSD on two RL02 drives? Probably not, but...

On 8/4/17 7:37 AM, Phil Blundell via cctalk wrote: > ASSPs like TI's TUSB9260 which turns up a big fat nothing in a web search is there a data sheet somewhere? the 6250 is a SATA 2 to USB using an 8051 core, but I suspect you can't get the code for that. one of the common pata-sata bridges

Re: Convex documentation online (C220 arrived)

On 8/3/17 2:45 PM, Curious Marc via cctech wrote: > Wow, that's mighty impressive. I knew about your FPGA 360/65 project but had > never seen your website before. There is also a simulation book in the works in cooperation with 'vaxman' http://www.analogmuseum.org/english/about_me/

Re: 2.11BSD on two RL02 drives? Probably not, but...

On 8/4/17 7:44 AM, systems_glitch via cctalk wrote: > There are indeed cheap SATA -> IDE bridge ICs. yup, I'm running around 50 of them in my upgraded XServe RAIDs when I converted to 1tb 2.5" SATA-2 drives in 2015.

Re: 2.11BSD on two RL02 drives? Probably not, but...

the cheap bridges are actually based on the 20330 you can find a real data sheet if you search for JM20330_datasheet_v2.5.pdf hard enough some discussions of their use with ssd trim https://forum.thinkpads.com//viewtopic.php?t=115329 On 8/4/17 8:08 AM, Al Kossow via cctalk wrote: > >

Re: IBM 5280

On 8/4/17 9:20 AM, Al Kossow via cctalk wrote: > https://halsoft.wordpress.com/2008/06/02/the-next-generation-key-punch-the-ibm-5280/ > > http://www.computerhistory.org/collections/catalog/102675777 > > i'll see what's there.. > weird, it doesn't look like I scanned thes

Re: scary warning about bubble memory loop mask, TI 763/765 maint manual

the terminals pop up on eBay every so often. I picked up a couple in poor physical condition as donor machines for the one clean one I've found On 8/5/17 10:56 PM, Eric Smith via cctalk wrote: > With Intel devices, there is a special "seed module" and procedure that can > be used to recover

Re: Visual 1050

On 8/7/17 7:08 AM, william degnan via cctalk wrote: > I agree. I keep meaning to archive my software dumping the firmware and character generator would be a good thing to do as well

3.5" 1.44mb floppy disk block diagram/schematics

I was looking at this thread https://forum.kryoflux.com/viewtopic.php?f=3=749 And they mention the data they were looking at has AGC applied. I didn't know any floppies used AGC in their read channel and in particular I'm trying to find a block diagram or schematic of the logic in the Teac

Re: The Name of the disk (Was: Disk imaging with IMD - question

http://www.retrotechnology.com/herbs_stuff/drive.html is more detailed than the On 8/10/17 1:32 PM, Tom Gardner via cctalk wrote: > Me too - great rant.

Re: 3.5" 1.44mb floppy disk block diagram/schematics

On 8/16/17 11:20 AM, Tony Duell via cctalk wrote: > But I am not so sure about AGC. I've looked at the schematics for > some 5.25" drives and I can find no AGC circuits. Nor on the Sony > 3.5" full-height 600rpm drives. So I would not be at all surprised if > there was no AGC on this Teac. I

Re: HIRING! Diablo Model 31 Disk Drive repair for Xerox Alto

On 8/22/17 6:34 AM, Nick Allen via cctalk wrote: > looking > into Network boot with Carl, but this is not yet a possibility. Maybe you can get one of the LCM 3mbit PCI-e cards from LCM?

Re: HIRING! Diablo Model 31 Disk Drive repair for Xerox Alto

On 8/22/17 8:31 AM, Al Kossow via cctalk wrote: > > > On 8/22/17 6:34 AM, Nick Allen via cctalk wrote: >> looking >> into Network boot with Carl, but this is not yet a possibility. > > Maybe you can get one of the LCM 3mbit PCI-e cards from LCM? > I wish Ken

Re: Hershey Fonts now 50 years old

Max Mathews produced a set of three fonts at Bell Labs in 1967 as well. "Three Fonts of Computer-drawn Letters" The Journal of Typographic Research pp 345-356 https://s3-us-west-2.amazonaws.com/visiblelanguage/pdf/V1N4_1967_E.pdf which we have in the collection

Re: Hershey Fonts now 50 years old

On 5/11/17 7:45 AM, Paul Koning wrote: > Computer drawn characters are older than that going back to Whirlwind, et. al. I don't think the point was a 'first' beyond the Hershey set being one of the earliest generally available glyphs made available, and as such end up getting used in

Re: Ethernet 1973/1974

This is an early version. They made some changes like adding a protection diode and resistor on the coax input after a nearby lightning strike at PARC wiped out a bunch of them. I guess I should pull apart the original Xerox 10 meg one which was designed by the same guy to see how similar they

Wollongong HP 3000 TCP/IP

Did someone on the list outbid me on these? http://www.ebay.com/itm/262963986628

TC-11 RALL reader

here was the thread way back when https://groups.google.com/forum/#!topic/vmsnet.pdp-11/0RZKjpVmIGQ and http://www.dbit.com/pub/pdp11/rt11/putr.mac I'm still looking for my version of putr.mac but that should get you started. Most of the non PDP-11 tapes on bitsavers were read with this.

Re: RC11 manuals / schematics online?

that does seem to be the case. I never looked to see that rhodium plates silver white. http://www.foxfinejewelry.com/blog/article/rhodium-plating-or-dipping-your-yellow-gold-jewelry-into-white-gold-jewelry/ On 6/12/17 10:43 AM, Paul Koning wrote: That seems odd because rhodium is a noble metal

Re: RC11 manuals / schematics online?

On 6/12/17 7:17 AM, Mattis Lind via cctech wrote: > There is a note in my RS64 manual, page 3-1 / Figure 3-2, that says "Silver > colour Soaped water, Dark blue Special cleaning liquid" and then an arrow > to the disk surface in the picture. > Any thoughts about what the "Special cleaning

Re: File recovery help needed (Alabama)

> Which brings it all down to: > "How do you read 5.25" MS-DOS disks?" > Try reading the cctlk archives This has been discussed AGAIN and AGAIN for several decades. cctlk badly needs a FAQ

Re: DB11-A Bus Repeater Engineering Drawings

On 6/24/17 9:14 AM, Noel Chiappa via cctalk wrote: > So, Paul A lent me a set of these (thanks Paul!) so I could scan them in (they > are not currently available online). sigh.. http://bitsavers.org/pdf/dec/unibus/DB11-A_RevS_Engineering_Drawings_Jan76.pdf which has the schematic they have

Re: DB11-A Bus Repeater Engineering Drawings

Kossow via cctalk wrote: > > > On 6/24/17 9:14 AM, Noel Chiappa via cctalk wrote: > >> Does anyone else have a set of these prints? > > > http://www.computerhistory.org/collections/catalog/102753063 > > i'll try to get to it today > >

Re: DB11-A Bus Repeater Engineering Drawings

On 6/24/17 9:14 AM, Noel Chiappa via cctalk wrote: > Does anyone else have a set of these prints? http://www.computerhistory.org/collections/catalog/102753063 i'll try to get to it today

NCR 6081

would be nice if someone could save this, since it is so complete. he's only off my about 20 years in the age of it www.ebay.com/itm/292132955235

Re: What is this bus?

On 5/28/17 8:28 PM, jim stephens via cctalk wrote: > The Pascal Microengine had a black and brushed aluminum package There was a bus version. I have cards, but no backplane.

Re: Anyone remember ZOSO disks?

On 5/29/17 10:30 AM, Amardeep S Chana via cctalk wrote: > I seem to recall this > person who went by the moniker of Zoso The mysterious Zoso was a reviewer of CP/M Users Group disks and was a contributor to Creative Computing, and probably other related SF Bay publications as well.

Re: Anyone remember ZOSO disks?

r. We trust that the incredible typographical errors encountered in this first emission do not extend to data lists as well as descriptive text. What the heck is a 'partical' list {p*4)? Zoso, hire a proofreader^ On 5/29/17 12:40 PM, Al Kossow via cctalk wrote: > > > On 5/29/17 10:30

Re: What is this bus?

404 it may be for a bus version of the pascal microengine On 5/28/17 7:42 PM, Mike Stein via cctalk wrote: > > - Original Message - > From: "Chuck Guzis via cctalk" > To: > Sent: Sunday, May 28, 2017 8:07 PM > Subject: Re: What is this

Re: I hadn't made the connection before

On 6/2/17 7:20 AM, dwight via cctalk wrote: > the CP1610 that was most of a PDP11 processor. A very odd version of the PDP-11 I did some programming on it for GI in the late 70's using their GIMINI development system and cross-development tools on their Sigma 9.

Re: Anybody has Control Data (CDC) disk packs for 841 and 844 disk drives to spare with?

On 6/3/17 10:21 AM, P Gebhardt via cctalk wrote: > The surfaces of the disk packs of type 9871 or 871 that came with it where > corroded and are not usable anymore. Did you keep them? The platters can be replaced with ones from the single-platter IBM 2315 (ie. RK05) and use similar head

Re: RK11-D print set

weird I would have missed that, it's the most common unibus disk interface there is http://www.computerhistory.org/collections/catalog/102749003 I'll have it up on bitsavers by noon PDT On 6/3/17 5:56 PM, Marc Howard via cctalk wrote: > Although I can find the RK11D users manual on the web

Chuck Thacker

I had the privilege of doing Chuck's oral history for CHM a few years ago. From: Christine Thacker [mailto:thac...@nhm.org] Sent: Monday, June 12, 2017 6:58 PM Subject: Chuck Thacker Roy, Alan, Butler & Kurt, I'm sorry to tell you that my father Chuck Thacker passed away in the early

Re: DEC archives

On 6/15/17 8:19 AM, Al Kossow via cctalk wrote: > If you look at the actual museum policy on copying material in the collection, > it is done on demand by staff at 50 cents per page. http://www.computerhistory.org/collections/requests/

Re: RC11 manuals / schematics online?

On 6/10/17 1:59 PM, Mattis Lind wrote: > > BTW. Speaking of dumping. Now that I have a TC11 / TU56 that seems to be > working, what is the best way to dump 18 and 12 > bit tapes? Is there some PDP-11 OS that can do it or is it assembly > programming required? I had hopes that RT11 had such >

Re: DEC archives

On 6/14/17 7:27 AM, Toby Thain via cctalk wrote: > A thousand boxes are not at all accessible. They are trivial to access. You just have to cart your lazy asses to Fremont.

Re: DEC archives

There are no plans or budget to scan this material en mass, so it wouldn't make sense for anyone to come here assuming they would be allowed to do that. If you look at the actual museum policy on copying material in the collection, it is done on demand by staff at 50 cents per page. On 6/14/17

Re: McLeyvier music synthesizer

On 6/13/17 11:22 AM, Alan Frisbie via cctalk wrote: > 2. DTC 520-1 disk controller and its DTC-11 Q-Bus host adapter. > > Our current project is to replace the ST-506 disks with > the David Gesswein MFM disk emulators. To do this, we > need to determine the CRC algorithm used by DTC, which

Re: Bulk tape eraser

You may as well run them through a shredder. All modern tapes have embedded servo tracks. On 4/30/17 7:38 AM, Mike Loewen via cctalk wrote: > >Looking for recommendations for a bulk tape eraser for SDLT and DLT IV > tapes. > > > Mike Loewenmloe...@cpumagic.scol.pa.us >

Displaywriter disks

I got lucky, and this ebay lot http://www.ebay.com/itm/382069259067 contained single density copies of textpack 4, four copies of textpack 6, chart pack, report pack, bisync, async, and the training disks images under http://bitsavers.org/bits/IBM/Displaywriter -- these are very difficult

Something for the P3 you have in your back yard

http://www.ebay.com/itm/Vintage-Military-IBM-Computer-/201911842662 https://fas.org/man/dod-101/sys/ship/weaps/an-uys-1.htm

Re: Bulk tape eraser

On 4/30/17 10:04 AM, Chuck Guzis via cctalk wrote: > Certainly not DLT IV tapes--I've done the bulk eraser thing with them > and the result re-recorded just fine. > Sorry, I flipped DLT and LTO in my mind..

Re: Kryoflux or Catweasle

On 5/24/17 12:58 PM, ben via cctalk wrote: > With typo in VHDL you have hard problem finding that single gate > error. The world has been debugging 100,000+ gate systems with simulations for a few decades now. Once you've built up a set of test vectors, it actually becomes really obvious

Re: KDF 8189 processor board foobared (ebay warning)

On 5/21/17 8:51 AM, Rob Doyle via cctalk wrote: > How 'bout a brand new J11-based board for oldie S-100 systems? Reinventing incompatible I/O for existing operating systems. Maybe if they wrote a new unencumbered OS, but I'm not holding my breath. I don't get why they abandoned their

Re: Motorola SDA7 Dual Transistor

On 6/5/17 2:06 PM, Brent Hilpert via cctalk wrote: > I checked several Moto databooks from 1969 into the 70s last night and didn't > find it. (Not to suggest my checking is the last word). > SDA7 is not a 'standard' Motorola-style number. > Might have been a custom order. > > the 1972 books

Re: Motorola SDA7 Dual Transistor

I have the three volume moto transistor catalog from 1973 coming, it should have it in vol 3 On 6/4/17 5:44 PM, Michael Thompson via cctalk wrote: > I am trying to LTSpice simulate a DEC H-724 power supply from a PDP-12. It > includes a Motorola SDA7 dual transistor. I can find any information

Re: Serial keyboards

On 6/5/17 3:12 PM, Henry Bond via cctalk wrote: > the same price for the keyboard as the terminal is greedy. Welcome to the world of the keyboard collector, who buys up keyboards and leaves terminals and classic computers behind, rendering them useless.

Re: Anybody has Control Data (CDC) disk packs for 841 and 844 disk drives to spare with?

On 6/6/17 6:10 AM, Philipp Hachtmann via cctalk wrote: > And I have cables and lots of spare heads: All submerged since Saturday. I > most probly won't try to recover the packs If they really are that rare you may want to reconsider.

Re: Anybody has Control Data (CDC) disk packs for 841 and 844 disk drives to spare with?

On 6/6/17 11:56 AM, Paul Koning wrote: > >> On Jun 6, 2017, at 2:26 PM, Al Kossow via cctalk <cctalk@classiccmp.org> >> wrote: >> >> >> >> On 6/6/17 6:10 AM, Philipp Hachtmann via cctalk wrote: >> >>> And I have cables and lots of s

Re: RIP Jerry Pournelle - Firsts

On 9/15/17 12:36 PM, Chuck Guzis via cctalk wrote: > I recall that he was a bit of a pompous a** on his Usenet postings, but > you have to realize that the tenor of online conversation was very My one interaction with him was at a Hackers. insert DRUNKEN between pompous and a**

Alto 5-Key Keyset pictures

I had to fix a key on CHM's keyset today, so I shot a bunch of pictures while it was apart http://bitsavers.org/pdf/xerox/alto/Alto_5-Key_Keyset They spent a lot of money on this. There are two castings of the same material as the keyboard and monitors, and two injection molded parts for the

21mx/7906 and 7970 in two racks that needs to go in San Carlos, CA

also a 7970E and a Kennedy 9000. would like to have these gone before the second week in Oct if someone in the Bay Area can pick them up and bring a couple hundred bucks with them. i'm just about out of that space and want to get finished up. there is also an 11/34A w FPU and cache, RK, RL and

Re: Control Data ad: Omega 480 "370 compatible alternative" on eBay

On 10/6/17 5:59 AM, Anthony Bennett via cctalk wrote: > If this is the machine that I am thinking of, it was made by Intel and > marketed by them as the AS/5. Itel

Re: Hallicrafters S-85

On 10/7/17 4:05 PM, Adrian Stoness via cctalk wrote: > I've got a sx28 needs to be recapped has allot of humming going on was last > serviced in the 70s by my dad he got it for free when he was 12 if he could > carry it home a mile this is all pretty far off-topic, so I'll leave this with

Re: Hallicrafters S-85

On 10/7/17 2:39 PM, couryho...@aol.com wrote: > What  homed  you in  collecting Hallicrafters? A friends SX-43 got me interested in shortwave, and in getting my ticket when I was in high school. I was given a basket-case SX-115 when I was 17 that I never got going. Apparently, those are worth

Re: Diablo 31 air filters / plugs ?

On 10/7/17 1:31 PM, Jerry Weiss via cctalk wrote: > There wasn’t a head lock. yes, there is. It is a 'L' shaped bracket that screws onto the top of the actuator. Details in the manual You can tie-wrap the actuator or tape the disk with the cylinder numbers on it to keep it from moving without

Re: OT: the death of shortwave / Re: Hallicrafters S-85

On 10/8/17 7:42 AM, dwight via cctalk wrote: > Most hams today seem to be into 2 meter and not so much long range SW. > There is a huge base of HF work being done along with real-time mapping of HF and Tropo propagation, along with all the software defined radio work.

Re: (Classic Computers) HP 7970 1/2" 9-Track Reel-to-Reel Tape Drive

On 10/3/17 7:24 PM, Chuck Guzis via cctalk wrote: > Al has a bunch of 7970 stuff on bitsavers, but not, I think (I > could be wrong) the manual specific to the B and C models. I still have several tubs of HP manuals that I haven't gone through and I remember there were several revisions for the

CHM Alto demo event Nov 10

fyi, just noticed this is up now http://www.computerhistory.org/events/upcoming/#yesterdays-computer-tomorrow-xerox-alto

8" magtapes

On 9/29/17 8:56 AM, Henk Gooijen via cctalk wrote: > Now I'm looking for 8" mag tapes/reels that will fit! http://www.ebay.com/itm/311973810676 even a good brand.

Re: Bridge Communication Unibus Ethernet board?

of my background projects has been trying to collect enough parts to bring up a Sytek broadband network, which IBM also sold as their first PC LAN. On 8/30/17 8:56 AM, Al Kossow via cctalk wrote: > > > On 8/29/17 1:46 PM, Henk Gooijen via cctalk wrote: > >> Does anyone ha

Re: Bridge Communication Unibus Ethernet board?

On 8/30/17 10:05 AM, Guy Sotomayor Jr wrote: >> One of my background projects has been trying to collect enough parts to >> bring up a Sytek broadband >> network, which IBM also sold as their first PC LAN. > > Cool! I worked on that (at IBM). ;-) the PC network tech ref has been up since

Re: Bridge Communication Unibus Ethernet board?

On 8/29/17 1:46 PM, Henk Gooijen via cctalk wrote: > Does anyone have more info about this (dusty) board: > > http://forum.datormuseum.se/data/87681DD5-B816-494C-AA4C-D8DB3FA35406/F7AD48D3-5450-4860-A0C9-23CB7277AC91.jpg try dumping the eproms and see what the strings say it looks like a

Re: HP 7970B Capstan?

On 9/6/17 9:20 PM, Chuck Guzis via cctalk wrote: > If you could spare it for a week or so, I'd be grateful. On the other > hand, my MCU setup for the drive works great--it reads a tape and > stashes the data as a .TAP file on an SD card. The problem you're fighting is things are just a little

Re: HP 7970B Capstan?

I could mail you a skew tape. On 9/6/17 8:09 PM, Chuck Guzis via cctalk wrote: > I'm just scratching around looking for ideas.

Re: HP 7970B Capstan?

On 9/5/17 11:09 PM, Chuck Guzis via cctalk wrote: > The read results have improved considerably. tension arm servo acting reasonably? what style arm sensor does your drive have?

Re: formatting MFM drives on a IBM PC

On 9/28/17 7:38 AM, Mike Stein via cctalk wrote: > What is it that usually fails when the drive can't read the servo info? The > data on the platter, or? I've never dug that far into it beyond fiddling with Micropolis trying to mechanically get it to find the servo tracks and calibrate to

Re: HP 7970E - interest to split?

On 9/29/17 8:48 AM, Jon Elson via cctalk wrote: > I did a few of these on a lathe years ago.  It was a couple minutes job per > reel. you are also going to have to cut holes near the hub so that you can get a tape started on the takeup reel.

Re: HP 7970E - interest to split?

On 9/29/17 11:35 AM, Chuck Guzis via cctalk wrote: > Does the little Kennedy drive have a vacuum takeup reel? No, they are tension arm, very similar design to the 7970 I wanted to compare the mechanical design of the 9000 to the 7970 but don't know if I have the time/interest any more.

Re: formatting MFM drives on a IBM PC

On 9/28/17 7:21 AM, Geoffrey Oltmans via cctalk wrote: > Were any earlier MFM/RLL voice coil/servo > controlled, or were they all stepper drives? > Most drives 40mb and up are closed-loop with dedicated servo surfaces and many have servos that don't work any more. Maxtor and Atasi are early

Re: That Tek 405x QIC Tape.

On 10/3/17 2:50 AM, Jos Dreesen via cctalk wrote: > Al is maintaining a set of ROM images for these machines, are tape images > covered somewhere  ? > Do we have an fixed tape image format, as has been done with Dave's IMD for > floppies ? As far as I know, no one has successfully made a

Re: That Tek 405x QIC Tape.

On 10/3/17 8:29 AM, Mike Stein via cctalk wrote: > Sounds like a similar system to what Burroughs used on their cassettes; I > always thought that they'd be a lot easier to read than the 'normal' formats > with embedded clock signals and always intended to try to read some of the > tapes I

Re: That Tek 405x QIC Tape.

On 10/3/17 2:50 AM, Jos Dreesen via cctalk wrote: > That "famous" QIC tape unit Tektronix 405x tapes aren't QIC They are 3M DC series cartridges, but the encoding is not a QIC standard.

Re: More updates

On 8/26/17 7:36 AM, Jay West via cctalk wrote: > For official bitsavers mirrors, rsyncd has been turned back on (it was off > while bitsavers was migrated to the new classiccmp server, and during > testing). A HUGE thank you to Jay for taking the time to do this. I had about 100,000 pages in

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