test-drb

test-drb@ccmp.vtda.org

101090 discussions

by cmhanson＠eschatologist.net

I have the 32MB memory expansion card for my SPARCstation 2 (P/N 501-1823) but not the accompanying cable (501-1814) or 32MB mezzanine card (501-1824). Does anyone have either the cable or mezzanine card that they?d be willing to part with for a reasonable price? I?ve only found sellers carrying them for hundreds of dollars recently; I managed to snag the ?1823 from someone who was selling it far more reasonably, probably because they didn?t know what they could get for it. -- Chris

7 years, 3 months

Greetings

by raywjewhurst＠gmail.com

I am new to the list and would like to introduce myself. I am a computer history buff who especially likes DEC machines. I unfortunately don't own any hardware but I use Simh on a daily basis. I would like to start off with a question. I see that Bitsavers has a copy of VMS 1.5 and wanted to know if anyone got it working with the Vax 780 simulator? I hope to learn a lot from this group. Thanks Ray

7 years, 3 months

Tandem 6526 information?

by cmhanson＠eschatologist.net

A friend not on the list obtained a Tandem 6526 terminal. In the process of trying to refurbish it, the first 80 bytes of its ROM got trashed. Does anyone happen to have one so she could recover from this? Also, she has no keyboard, and no information about Tandem?s block mode or other protocols (much less the keyboard interface), does anyone know where to find such details or have a manual handy? ? Chris Sent from my iPad

7 years, 3 months

Modern Rack Rails in Classic Racks?

by healyzh＠avanthar.com

How safe is it to put modern rack rails (HP) in a classic DEC Rack? The DEC racks have small holes, while the new HP racks, IIRC, have big square holes. It looks like the rails will work, they just won?t clip flush. Zane

7 years, 3 months

Ultrix 3.0 VAX

by dennis.grevenstein＠gmail.com

Hi John, thank you for the idea. I finally managed to boot and install Ultrix 3.0. I prepared a new harddisk image under Ultrix 4.0. I could find /usr/sys/SAS.net/vmunix in the Ultrix 3.0 distribution tapes. This is a standalone kernel that will start the installation process. It can be booted like a normal kernel and can use the 3.0 tape images available from bitsavers. Dennis

7 years, 3 months

H960 rack on eBay

by jnc＠mercury.lcs.mit.edu

H960 (rack only, really, although it looks like there are two NA11-N/S sheaths as well): https://www.ebay.com/itm/123729450695 Not a bad price; pick-up only though (just as well, considering how much it costs to ship the blasted things). Noel

7 years, 3 months

NOS HP 7906 disk heads

by aek＠bitsavers.org

If someone needs top heads, this seems to be a decent price https://www.ebay.com/itm/303136246855

7 years, 3 months

No subject

by couryhouse＠aol.com

Tom -? ?Thanks much for? ?filling in? some of the blanks on the history!? ?Ed# In a message dated 4/23/2019 2:36:37 PM US Mountain Standard Time, t.gardner at computer.org writes: ISS was an independent company in the era (late 60s) of the 714 (IBM 2314 compatible).? It was later acquired by Itel (a leasing company) and then by Univac and sort of disappeared in the 80s. Depending upon your application almost any plug compatible 2314 might work or could be made to work.? The interfaces were very much 2314 like except the PCMs and OEMs didn't use IBMs +/- 1.5v signaling levels on the interface but instead used DTL driver/receiver signaling.? There was also some weirdness in the power sequencing all of which can be worked around if u are up to it. Tom -----Original Message----- From: ED SHARPE [mailto:couryhouse at aol.com] Sent: Monday, April 22, 2019 11:37 AM To: cctalk at classiccmp.org; aek at bitsavers.org Subject: Re: Telex 20 Meg 10 platter very heavy monster drive needed drop line off list..r Thanks? Al? yes, that? is? the? one. and? as? I? recall? ISS? was a? offshoot? on? univac Do? you? have? any? Thanks Ed# In a message dated 4/22/2019 11:34:58 AM US Mountain Standard Time, cctalk at classiccmp.org writes: Thanks? Al? yes, that? is? the? one. and? as? I? recall? ISS? was a? offshoot? on? univac?In a message dated 4/22/2019 11:21:50 AM US Mountain Standard Time, cctalk at classiccmp.org writes: On 4/22/19 11:05 AM, ED SHARPE wrote:> Al,? the? drive? you mention at? its? largest? was? 7.5 meg? and? 6? platters... not? ? the? one Telex bought their drives from ISS.You're looking for a ISS 714 (ca. 1970) 2314 compat.https://ia800608.us.archive.org/15/items/TNM_Information_Storage_Sys… aek at bitsavers.org;cctalk

7 years, 3 months

Elliott 5-level code: just in case you have some oddball 5-level paper tapes

by tshoppa＠wmata.com

Immensely happy this morning to have finally tracked this down. This is a 5-level code by Elliott used on many of their computers. It seems to have used standard looking 5-level teletype I/O devices but with custom typewheel and keyboard/function bar encoding. It has 3 things in common with other 5-level codes: 1: Letter shift and Number/Figure shift 2: Null is all zeroes 3: Letter shift is all ones and also works as delete just like the other codes But some interesting properties, different than other 5 level codes: 1: Letter shift has the letters in alphabetic A-Z sequence. 2: In number shift, the lower 4 bits are the digit 0-9, and the upper bit is a parity 3: Figure shift, space, carriage return, and line feed are at the extreme top end of the code space right under letter shift. The code is documented in Figure B.2 of this wonderful document: http://rabbit.eng.miami.edu/oldcomputers/Elliott-400-series.pdf I'm a little surprised that my standard character code references don't mention this. This is a super elegant layout that any of the 1960's character code standard guys must've known about, but somehow it never made it into any of my usual reference books. Maybe MacKenzie was just too dismissive of all 5-bit codes. He mentions ITA2 for a couple pages and then never talks about 5-level codes again, but he never stops talking about BCDIC and he goes on and on about hypothetical 12-row punchcard ASCII. Tim N3QE

7 years, 3 months

Televideo 925 character rom dump

by guykd＠optusnet.com.au

When I saw this thread I thought 'Oh, I have a 925!' Which was working last time (years ago.) But wouldn't you know. When I checked, it's a Televideo 924. Off by one. But perhaps the character ROM content is the same? Anyway I will see if it still works, and secure all the ROM images. Today. I have the user manuals, but does anyone have schematics for the 925 & 924? Guy At 09:38 AM 23/04/2019 -0700, you wrote: >On Tue, Apr 23, 2019 at 8:25 AM Patrick Finnegan <pat at vax11.net> wrote: > >> On Tue, Apr 23, 2019 at 11:02 AM Jon Elson via cctalk < >> cctalk at classiccmp.org> wrote: >> >>> Is the ROM totally bad, or just losing a few bits here and >>> there? If the latter, you could probably read it out, figure >>> out how the rows, columns and characters are mapped, and fix it. >>> >> >> Considering that 925s are really common, and a replacement EPROM should be >> easy to source and program, this sounds like an overly difficult approach >> that will yield something different than what he wants. >> > >The thought had crossed my mind, but only as a last resort. I'm not >entirely sure what the internal fault is, but the end result is two rows of >every character have all bits stuck "on." I've verified that the ROM >addressing is correct and that there's nothing on the output side causing >this behavior. Patrick, thanks very much for offering to read the ROM! > >- Josh > > > >> Pat >> >

7 years, 3 months

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