test-drb July 2007

test-drb@ccmp.vtda.org

189 participants
323 discussions

by chrism3667＠yahoo.com

http://cgi.ebay.com/VINTAGE-1984-WANG-COMPLETE-PC-XC3-2 -SYSTEM-WORKING_W0QQitemZ220133233591QQihZ012QQ categoryZ1247QQssPageNameZWDVWQQrdZ1QQcmdZViewItem I do not recommend exercising the b-i-n option though, despite the promise of free shipping. oi ____________________________________________________________________________________ Get the free Yahoo! toolbar and rest assured with the added security of spyware protection. http://new.toolbar.yahoo.com/toolbar/features/norton/index.php

17 years, 4 months

AVAILABLE: Diable 1610 Hytype DW printer

by cclist＠sydex.com

I went ahead and picked up the Diablo 1610 printer from the local party here who was trying to find a home for it. Now I want to give it a home... I checked it out--it works just fine and includes several typewheels (all various flavors of Courier) and ribbons as well as the operator's manual. Includes forms tractor. In pretty good condition for a 30 year old printer. This is an RO (no keyboard) model in charcoal color skins. Serial interface 110-300 baud w no handshake; 1200 using ETX/ACK. Free for shipping from Eugene, OR. Cheers, Chuck

17 years, 4 months

Read error correction in software

by ajp166＠bellatlantic.net

> >Subject: RE: Read error correction in software > From: "Chuck Guzis" <cclist at sydex.com> > Date: Thu, 26 Jul 2007 12:50:27 -0700 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 26 Jul 2007 at 6:40, dwight elvey wrote: > >> Your right, not too good on multiple errors. > >Actually, on MFM, not even that good for single errors. Recall that >the CRC on a 256-byte sector is the 257th and 258th byte of the >sector. So, if an MFM error throws the data stream off, you don't >even get a valid CRC to work with. And MFM data errors can result in >data shifting and clock data "swapping". It might have been a whole >'nother story had the convention been that the CRC precedes the data. > >I've got some ideas about simulating a PLL-type clock in my routines >developing bit cell "windows" instead of relying on the pulse-to- >pulse spacing. The latter, while being very adaptable to ISV-type >errors, is lousy for recovery of regular data errors. If you implement a software PLL the key function is in the face of a missing pulse you keep the current clock rate and clock in a zero or or one as needed to fill the stream. The usual analog PLL tend to have an idle rate and lacking a error signal it will either retain the current rate or hunt back to the center rate. Since in a corrstly set PLL the error rate and the centered rate are not widely seperated drift is rarely a factor short term. Allison

17 years, 4 months

MMI 6701 bit slice?

by ajp166＠bellatlantic.net

> >Subject: MMI 6701 bit slice? > From: "Chuck Guzis" <cclist at sydex.com> > Date: Thu, 26 Jul 2007 10:47:31 -0700 > To: cctalk at classiccmp.org > >There's been a lot of chatter about the AMD 2901 series bit-slice. >Does anyone recall any system that employed the MMI 6701 series? > >Cheers, >Chuck CM2000, 2100 and CM2100 CM stands for Cininatti Millichron a 16bit Mini, used one around 73-74. There were others but cant recall which. Allison

17 years, 4 months

Imagedisk 1.17

by oldcpu＠rogerwilco.org

Dave Dunfield said: > A few days back I posted ImageDisk 1.17 to the site, and it's just > been reported (and confirmed) that it had a bug which causes it to > write images incorrectly (fortunately it appears to read them > correctly). > > I've corrected the problem and updated the package - if you have > downloaded 1.17 before today, please download it again. > > I've also restored Imagedisk 1.16 to the site, listing it as the > last known stable release, so that people won't be left hanging if > (when) something like this happens again. > > ...snip... > > It's annoying to invest time to do someone a favor (that they asked for) only > to find out that they consider their own time too valuable to follow up their > part - I'm sure Chuck will tell me that this is one of the reasons he finally > told people to shove Teledisk beyond the reach of solar illumination... > </rant> > > If anyone can help check out 1.17, that would be much appreciated. I for one am mighty grateful for the actual usefulness of IMageDisk and want to just through my .02 cents into the hat. It's a shame that your recent 'extra' efforts weren't/aren't properly acknowledged, and that the follow-through from the other side hasn't +happened. Still, please regard me as an appreciative user of IMageDisk. In recent months, I have processed nearly 450 floppies from my old MS-DOS days, as well as a set of CP/M and other development tools for my quite obscure, but not particularly noteworthy, Novell Data Systems 2010, a Z80A-based machine. I was becoming very, very nervous about the stability of those old NDS 2010 diskettes (not used since c.1982), and breathed a huge sigh of relief when I got all of those floppies imaged and burned to CD-ROM. Unfortunately, I've just finished my 'imaging project' using IMD 1.16, so I don't have much to test with 1.17. Still, my hand is extended to you for producing, *and maintaining*, such a useful tool for vintage collectors. Many thanks! - Jared

17 years, 4 months

broadcast automation yahoo group

by n8uhn＠yahoo.com

Hi, i finally got around to starting a yahoo group called "broadcast automation" http://groups.yahoo.com/group/BroadcastAutomation a place to share memories, photo's, repair tip's and general knowledge about vintage and not so vintage broadcast automation and other broadcast radio/tv gear. the group is geared toward collectors but all are welcome to join. like i said, i just created the group so the page/remailer is rough but as people join and post it can only grow ;-) please let anyone else who may be interested know about the new group Bill ____________________________________________________________________________________ Boardwalk for $500? In 2007? Ha! Play Monopoly Here and Now (it's updated for today's economy) at Yahoo! Games. http://get.games.yahoo.com/proddesc?gamekey=monopolyherenow

17 years, 4 months

Classic phone repair (was Re: 1966 Mag: Build NE-2....)

by classiccmp＠memory-alpha.org.uk

Hi, > Are you sure it's DTMF? Most GPO 'phones were pulse-dialing, even if they >had a keypad. GPO exchanges didn't eespond ot DTMF signals AFAIK. Yes, it's definitely DTMF....it even has "*" and "#" buttons either side of the "0", unlike any other Trimphones I've seen in the wild. According to the label on the bottom of the broken one, it was supplied by BT rather than the GPO. There's nothing indicating any date of supply or manufacture though. A friend got these phones for me around about 1989/90. He was on an industrial placement at Kidsgrove I think (working for either ICL or STC) and came across an entire skip full of the things next to an office block which was being refurbished. I guess they were used on an internal exchange? BTW Any idea when BT started "DTMF enabling" exchanges (presumably that came in with "System X")? I've got a vague recollection of requesting tone dialling around 1988 give or take a year, and having to have my number changed since only one of the five exchanges covering this area at the time was a System X exchange. > There may have neen an N-diagram for it (there's an archive of >these on the web -- do a google search for 'N-diagram').... Thanks, I'll go take a look. > I didn't think the ringer was that complicatated. Can't you trace >out the schematic? Well, I'm not sure it's just the ringer....when the phone was plugged into the line and someone called the (trim)phone on my extension would completely fail to ring. Also, the exchange would send them a single ring tone, then a few seconds of silence (as if the call had been answered), then another single ring....etc.... I suppose I should sit down and trace out the circuits. Most of the "complicated" stuff seems to be on the keypad (the DTMF encoder), the rest looks fairly straightforward. Just a matter of getting up the enthusiasm, not easy at the moment as I'm still fighting off the effects of coming off anti-depressants.... :-( TTFN - Pete.

17 years, 4 months

tek dos/50 floppy file system format?

by brad＠heeltoe.com

Does anyone have any information on the directory structure of a Tektronix DOS/50 floppy? I'll figure it out by hand, but I thought I'd ask in case someone else has already done it. -brad

17 years, 5 months

Apple Image Writer

by tpeters＠mixcom.com

Hi all, seems I might be getting fired this week. Interviewed for another position at the same place, but I'm up against someone with more experience. So, things to sell. I've got an Apple Image Writer dot-matrix printer to start with. It's the older version, I think based on a C.Itoh design, or maybe the NEC P8023? It's serial interface only, and there's life left in the ribbon. I didn't connect it to a computer but powered up holding the Form Feed button, it prints a barber-pole test. It's model A9M0303, which is not the more widely available ImageWriter II. It's the original. This dude (not me) has pictures of his. Mine looks just like it, except for the serial number: http://www.myoldcomputers.com/museum/perif/print303.htm I can take and send photos of mine in action, if anyone has interest in the printer. I have and will include the original box and packing materials, and the reference manual, but no serial cable (it's standard DB-25.) Is anyone interested in this item? Thanks, Tom ----- 544. [Love] Many a girl has gotten into trouble by obeying that boyological urge. --Katharine Brush (born 1893) --... ...-- -.. . -. ----. --.- --.- -... tpeters at nospam.mixcom.com (remove "nospam") N9QQB (amateur radio) "HEY YOU" (loud shouting) WEB: http://www.mixweb.com/tpeters 43? 7' 17.2" N by 88? 6' 28.9" W, Elevation 815', Grid Square EN53wc WAN/LAN/Telcom Analyst, Tech Writer, MCP, CCNA, Registered Linux User 385531

17 years, 5 months

Classic phone repair (was Re: 1966 Mag: Build NE-2....)

by classiccmp＠memory-alpha.org.uk

Hi, >....no internal schematics for the dialer (keypad/DTMF econder) >or ringer. Actually, I just spotted what you mean about the ringer....I'd forgotten it was a complete circuit board on it's own. It looks pretty simple though, only a handful of components (a transformer, four or six diodes, two BC108Bs and a few resistors/caps). Might have a bash at debugging it tomorrow afternoon. That diagram is still darn useful though, it lets me make sense of the rats nest of wires on the main board. TTFN - Pete.

17 years, 5 months

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test-drb July 2007