test-drb January 2015

test-drb@ccmp.vtda.org

175 participants
253 discussions

Atari 800XL RF cable (and I/O cable availability?)

by jules.richardson99＠gmail.com

I picked up a little Atari 800XL bundle the other day (system, pair of 1050 drives, and an 850 expansion box) - cheap because it was missing cables and power supplies. 1) When hooking this up to a TV via the RF input - is there any "magic" involved, or will a suitable braided co-ax TV cable with a phono connector added at the Atari end do? I know it "works" because I lashed one up quickly (and I do mean quickly, no soldering involved) and ran the machine >from a stray +5V PSU, which obviously resulted in a fuzzy picture - but then when it came to making a good one, I got to thinking about those little antenna switch boxes that US machines often seemed to come with, and wondering if there were a bunch of passive components in there which make a difference to the signal quality. 2) Does anyone have any spare I/O cables, or know of a source of the connectors so I can make my own? (I suppose while I'm here I may as well ask if anyone just happens to know what voltage power supplies the 1050's and 850 need, but I'm sure I can dig the answers to that up online if needed) cheers Jules

9 years, 11 months

HP16500B Logicanalyzator on ebay

by aswood＠t-online.de

http://www.ebay.de/itm/HP-Agilent-16500B-Modular-Logic-Analysis-System-Main… Wrong side of the pond. Seller is also offering a lot of Tek scopes, Kaypro and some other interesting equipment. Had a Convex SPP1200CD - also wrong side of the pond - I'd have love to get the board, even the Vicor DC-DC converter on the boards.... -- Andreas

9 years, 11 months

calling all HP7970 tape owners....

by marc.verdiell＠gmail.com

Jay wrote... ---- Here is a link to pictures of the bracket, in case someone has it laying around but doesn't realize "this is what that's for"... www.ezwind.net/hp2000/7970E/ The bracket is pictures 0520 through 0525 ---- I see. It's a more involved bracket than I thought, with 3D bends in heavy gauge steel. It will need to be bent by hand since it's not worth making a fixture for so few. It's going to be an interesting calculation for the hole position if they drill them pre-bend, they might not get it right first time. Let us know what you find out. Marc

9 years, 11 months

Atari 800XL RF cable (and I/O cable availability?)

by cctalk＠beyondthepale.ie

> > > 1) When hooking this up to a TV via the RF input - is there any "magic" > > involved, or will a suitable braided co-ax TV cable with a phono connector > > added at the Atari end do? I know it "works" because I lashed one up > > Maybe... The modulator output is nominally 75 ohm, and should be linked to > such a piece of coax. European TVs have a 75 ohm aerial input, often on what > we call a 'Belling-Lee coax socket', so it's just a cable. US TVs, I am told, may have > either a 75 ohm coax input, often on an F connector, or a 300 ohm balanced input > (for parallel twin feeder cable) on a pair of screw terminals. For the former, just > connect it up. For the latter you may need a matching transformer, aka a 'balun' > (BALanced to UNbalanced converter). I am pretty sure you can buy these, but > it must be possible to wind one if you can get a suitable core > I don't know whether some US televisions do this too but I have a Japanese radio that has two screw terminals for a 300 Ohm balanced feeder and alternatively allows a 75 Ohm unbalanced feeder to be connected between one of those terminals and a ground terminal which is also provided. Regards, Peter Coghlan.

9 years, 11 months

calling all HP7970 tape owners....

by jwest＠classiccmp.org

Need input from anyone that has a HP7970 tape drive mounted in a rack. Fortunately, all my 7970's have come with the special mounting bracket. This is not a part of the 7970 itself. It is a long flat metal bar that mounts on the left of the rack. It bolts in from the front, and provides threaded holes on the side further back in the rack. While the right side of the 7970 is bolted into the rack from the front, on the left side - you open the chassis and bolt from inside the chassis on the left wall into the threaded holes provided by this mounting bracket. Given that, it would appear to me that mounting a 7970 WITHOUT that special mounting bracket would not be easily done. I'd like to know if anyone has mounted a 7970 in a rack without said bracket and if so - how did they do it? Since I've always used HP racks and the special 7970 mounting bracket my experience is probably blinded, but I don't see a way to do it without the bracket. Best, J

9 years, 11 months

Wanted: Apple II Plus escape key

by jules.richardson99＠gmail.com

I have an Apple II Plus at home with a broken escape key - does anyone happen to have a basket-case keyboard that they'd be able to salvage one >from for me? There's a little bit of stem left on the keyswitch, so I think I could possibly make it work with just the keycap, although (assuming the machine's keyboard even uses individual switches, I've not actually dismantled to check) I probably wouldn't say no to the associated keyswitch, too. It's an ex-school machine, so I wonder if it was broken off intentionally (i.e. to stop kids quitting out of some software that they weren't supposed to) - the system's in great cosmetic shape otherwise. cheers Jules

9 years, 11 months

Equipment Available (more)

by jwest＠classiccmp.org

Just received the following "equipment available" email.. Vax 8600 MicroVax II 8mm & 4mm SCSI tape drives 6250 tape drive Dec 64 bit unix first DEC PC (Rainbow) with graphics card (1984) a lot of manuals an IBM AIX box too Location is Houston, TX. DO NOT EMAIL ME ASKING FOR MORE SPECIFICS. If you are interested in *ALL* of the gear, contact me off list and I'll put you in direct contact with the owner. If you want just PART of the gear, do not email me. Email whoever winds up getting the gear and work it out with them. Best, J

9 years, 11 months

Apple Lisas on Craigslist

by mark＠markesystems.com

I don?t really do Apple, but this seems like a pretty good trade for someone. I emailed the seller (trader?), and he responded, so I think it?s a real deal... http://sfbay.craigslist.org/sfc/sop/4845748625.html ~~ Mark Moulding

9 years, 11 months

found 8"floppies

by simski＠dds.nl

hello all, received a box with a shugart 800-2 drive and some 8" floppies containing IBM system/1 software and one from intel with ISIS-II is this already online available or should I try to make images of them? ibm disks: rps pascal (2 of 2 ptf 5719-pc6-brg1 (2of 2) s1-IWSRPS-RPS-VOL (1 of 1) rps data entry system (5 of 5) s/1 rps realtime pgmm sys v6 (1 of 1) rps index acces method v2 (2of2) s/1 rps realtime pgmm sys v6 (disks 21-24 of 24) refresh-01-sm1 (1of1) rps pgm preparation subsys v (disk 24 of 28) the isis-II is version 3.4 -- Met vriendelijke Groet, Simon Claessen drukknop.nl

9 years, 11 months

MEM11 Status Update

by jnc＠mercury.lcs.mit.edu

> From: Johnny Billquist > The KI10, which is the one that pops into my mind here, have a > different panel, as the cabinets are wider. The KA10 had a mixture of narrow and wide cabinets. The two main CPU bays were wide (as were the display panels at the top - the one I have is 48 lights wide), as was the MA10 (I think) and MF10 (pretty sure about that one). Other bays (such as the DF10) were narrower (I think standard 19"). I didn't see much of KI10's, so I can't say for sure, but I suspect the same was true of them: I'm pretty sure they used the same DF10, etc as the KA10. Noel PS: Speaking of KI10's, does anyone know the story behind the bizarro images of the 'KI10 Indicator Panels' in the DECsystem-10 System Reference Manual (DEC-10-XSRMA-A-D; 3rd Edition, August 1974 - although other editions may have them too), pg. F1-5? Were those just placeholders that got by editorial control, or was that some sort of complicated in-joke?

9 years, 11 months

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test-drb January 2015