test-drb June 2005

test-drb@ccmp.vtda.org

221 participants
681 discussions

by dave04a＠dunfield.com

At 10:09 19/06/2005 -0400, you wrote: >Dave: > > Yes, this would be a big help as it's two pages more than I have >at this point. :-) Rich, After sending you the SMC datasheet this morning, I dug a bit deeper and found the actual AY-5-2376 data sheet. I can confirm that this is the same pinout as the SMC device, and appears to be compatible. I see that Michael H. has posted a more complete SMC datasheet - that should give you everything you need, however if you wish, I can scan the AY-5-2376 datasheet for you. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html

19 years, 2 months

booting and 11/44 via tu58 sim?

by ajp166＠bellatlantic.net

> >Subject: booting and 11/44 via tu58 sim? > From: Brad Parker <brad at heeltoe.com> > Date: Sun, 19 Jun 2005 17:05:14 -0400 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > > >Hi, > >On a whim (hey, it's father's day :-) I decided to try and boot my >dormant 11/44 from the TU58 using the tu58 simulator. > >Has anyone done this? Functionally it should. last time I did it I used a real tu58 in a lab back at DEC on a reabygosh(tm) 11/44. had to run the DL port slow. >I'm being totally lazy and didn't look at the M7090 schematics (yet) and >assumed the TU58 20pin header is the same as the console 20pin header. >I also assumed it's RS-232 and not TTL. Further, I assumed it was >running at 38400 baud. Both do RS423 (6wire version of RS232, sorta), you will need to verify hookup but it works. >Naturally it didn't work right off the bat... :-) > >I know my serial port and tu58 simulator are working since they boot my >11/730 just fine. > >I'll look at the schematics but I thought I'd ask for any sage advice. > >(luckily my spare UBI board had a DD boot rom on it) > >-brad Run slower, the 11/44 the DL port used typically for TU58 is down the interrupt priority and it can loose data if too fast (overrun). I'd start at 4800 (known good) and then try 9600 or faster. Allison

19 years, 2 months

My classiccmp non-retirement :-)

by aek＠bitsavers.org

>> how MUCH has been saved from DEC (thanks to the efforts of collectors >> and CHM). Is there an index somewhere of the CHM collection, and what parts of it have been recovered? -- Sellam, as software curator, is responsible for that. AFAIK, this is just starting. A few things (TIXO and PDP-1) paper tapes along with some PDP-8 paper tapes have been done. The large collection of 10/20 tapes >from DEC haven't been touched yet. I've been discouraging them >from attempting this until better drives than stock 1/2" drives can be obtained. Lyle's large collection of 8/12 DECtapes need to be read as well.

19 years, 2 months

Looking for data sheet for AY5-2376

by swtpc6800＠comcast.net

> Does anyone have a PDF copy of the data sheet for the General > Instruments AY5-2376 ASCII keyboard encoder chip? > > Rich Cini I have a 4 page version of the SMC KR-2376 on my SWTPC CT-1024 web page. It was used in the SWTPC KBD-5 keyboard. http://www.swtpc.com/mholley/CT_1024/KR2376.pdf Michael Holley www.swtpc.com/mholley

19 years, 2 months

HP 3000?? Thing-a-ma-jig available

by jwest＠classiccmp.org

As part of another deal, I acquired a piece of HP gear I have no interest in (nor do I know for sure what it is). It's an HP 30151A or "ATP Expansion Package". It appears to have 24 modems in it, or serial ports at the least (I haven't popped the cover). Pictures of the unit are at: http://www.ezwind.net/jwest/hp30151A Can someone elicudate what this is and what it's designed to connect to? If it's nothing I can use... it's available for shipping costs. Jay West

19 years, 2 months

BBN TC2000 rescued (was: May need help with rescue in RI)

by uban＠ubanproductions.com

First of all I would like to thank everyone who offered to help rescue the BBN TC2000 from Rhode Island. As it turned out (read below) the scheduling of this became a mess and I ended up going alone, but that wasn't because no one offered... I left early in the morning of 6/10 in my wife's '97 Tahoe (w/120k miles) to begin my 900 mile trek to my brother's home in Westford MA. I've made the trip a number of times and when I am driving it by myself, I drive it straight through with a couple of stops for fuel, food, restroom, etc. The drive consists of getting onto I90 and heading east until just before it drops into the Atlantic. All was going well until I had just crossed into Massachusetts and was accelerating out of the turn pike toll booth when there was a "clunk" and the engine reved higher than usual before shifting gears (automatic). Needless to say this got my attention! I took the next exit and pulled off to see if I could determine what had gone wrong. I checked the transmission fluid and it was full and didn't seem to be burned, so I called my brother and gave him the news and decided to continue on. When accelerating, the shift point was still high and there seemed to be problems when going into 4th, so I put it into 3rd and kept it under 65mph. Nervous, I kept track of mile markers so that if it gave out entirely, I could let someone know where I was. Fortunately the trip to my brothers was successful -- woo! Once in my brother's driveway, I determined that in addition to whatever else was broken in the transmission, reverse was now dead as well. Being late on a Friday, no shops were open and being MA, no transmission shops were open on Saturday either. I had scheduled to pick up the TC2000 at 11a on Saturday morning and it was a two hour drive, so it seemed that the only option was to rent a truck for the pickup. As single day rentals of cargo van (a full size van, not a mini-van or moving truck) seemed too expensive from places like U-Haul, checking Enterprise showed that there was a van locally and it would only be around $70 for the day. I signed up online and waited for them to open at 9a Saturday morning. My brother went with me to pick up the van and we were surprised to find that there was in fact a van in the Enterprise parking lot! We were a few minutes early and waited for someone to show up. When they did, we indicated that we were there to pick up the van which we had reserved the night before and that we were impressed that there was in fact a van in the lot. The person told us that they were very sorry, but that one was already reserved and had been for a week and that "they" shouldn't allow reservations of van's online. So much for picking up the TC2000 on that Saturday. I called the guy who was to meet me and he was very accommodating and said to just let him know when I could reschedule. So I perused the yellow pages and decided that I would call AAMCO Monday morning and get them started on fixing the transmission. My original plan had been to pick up the TC2000 on Saturday, go to work at my companies nearby office (I mostly telecommute anyway, so I can work at home or any one of the offices around the country with equal ease), give a presentation to some of the locals on Monday, and return home on Tuesday. This was obviously going to change. After talking to the AAMCO guy bright and early when they opened, I arranged to have them tow the truck in and I went to work. They called me about mid day with the initial estimate and asked if they should proceed with a rebuild, etc. I said yes and asked how many days it would take. The guy indicated that they average about 3.5 days. My week progressed and on Tuesday I talked to the AAMCO guy again to see how it was going. He now had a firm finish time of either the end of Wednesday or by noon Thursday at the latest, so I began rescheduling my pickup in RI of the TC2000 machine. I figured that I would just pick up the truck at noon on Thursday, drive down to RI and pick up the machine, then spend one more night and head home on Friday morning. I talked to the guy I would be meeting and made the arrangements. For some reason I didn't bother to call AAMCO on Wednesday figuring that they would call me if there was a problem. Wednesday came and went and I called AAMCO on Thursday morning to verify pickup at noon. They told me that the technician had mistakenly done some work on another fellow's transmission Wednesday and that mine would now not be ready as planned. I would have to wait until Friday morning. Grr! So I called the fellow in RI again and told him the news. He was very understanding and we arranged to meet at 11a on Friday morning. My brother took me over to the AAMCO shop Friday morning at 8:30a, I paid the large bill, and took my truck, hoping that it was really all fixed and would make the rest of the trip ok. My brother followed me for a way as it was in the direction he was going to his work place and I continued on to RI, arriving at 11a almost exactly. I met the guy and loaded up the machines, packed in a bunch of software (on various tape formats), some documentation, etc. The truck was packed to the gills and as I had been going on measurements as to if it would all fit prior to seeing the actual machine, I was very lucky. I had to remove a piece of trim at the rear ceiling of the truck to squeeze the machine in! Here is the beginning of my web page to document the TC2000... http://www.ubanproductions.com/tc2000.html Again, thanks to my brother for his help, shuttling me around, housing me, etc. and to the people who offered to help rescue the machine. Also a big thanks to the fellow who allowed me to rescue the machine and to my wife and son who I missed for a few unexpected extra days. --tom

19 years, 2 months

Motorola Microsystems 6800 offered.

by innfoclassics＠gmail.com

I posted one of my Motorola Microsystems rack mount 8 bit 6800 computer systems on ebay. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5210557139 For those that object to ebay I have second, basically the same, that I can offer directly for similar terms, $75 plus shipping. -- Paxton Hoag Astoria, OR USA

19 years, 2 months

Paging s.m.jones

by doc＠mdrconsult.com

If eBay ID s.m.jones is on this list, please contact me offlist. Doc

19 years, 2 months

War Games movie

by James＠jdfogg.com

> > I'll never forget the day I saw a beautiful redhead girl walk in to > > Eli's, immediately notice a PDP-8 board and get all excited about the > > bargain find (and she correctly identified it). She had been looking > > for one for *her* PDP-8. I was in love. > > So what happened?? Well, nothing. She was an MIT student and I was just a working geek in the unglamorous field service world. I didn't think the chasm was surmountable and I didn't even try. ---- There are only 10 types of people in the world, those who understand binary and those who don't.

19 years, 2 months

Timex/Sinclair 1000 Tape Loading

by ajp166＠bellatlantic.net

> >Subject: Re: Timex/Sinclair 1000 Tape Loading > From: Tom Jennings <tomj at wps.com> > Date: Sat, 18 Jun 2005 14:02:17 -0700 (PDT) > To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> > Cc: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On Sat, 18 Jun 2005, Gary Sparkes wrote: > >> I'm having a hell of a time getting any program to load, so far I've been >> Totally unsuccessful. > >You're having a vintage experience. This is unfortunately pretty >much how it went in 1980, only there was no mailing list for you >to gripe on :-) > >Audio cassette data systems are notoriously finicky about tape >speed and volume, then cleanliness, etc. > >You also have to hope that when the tapes were made, they were >with fresh batteries (or on AC adapter) and the volume was set >right, etc. It is not only possible, it was COMMON, to make tapes >that were never readable, even once. > >I recall (now, with prodding, ouch) tense >rewind/play/SHIT!/rewind/play/SHIT!/... sessions with my >sole cassette-based storage system. > Actually once I got it right even with the funky MITS ACR it was near everytime. After I dumped that and went to 9600 baud PE (Phase Encoded, fast version of tarbel and a few others). That and going to saturation recoding it was actually near 100% and faster if it did fail. Storage was always never enough, nor fast enough. Bulk random access storage was the holy grail of 1975. FYI: the funkyest device was an old audio echo drum. It was 1.15" high by about 9" diameter with a small AC motor and 20 staggered heads on two tracks. I shimmed the heads to form 5 tracks with two heads (one for read and one for write). The drum was coated with brown oxide and rotated at around 180 rpm (effective "tape speed of ~84ips). I figured it could hold 1kb per track at around 32k baud. It did. I ended up using that a for a few months (till the motor bearings which were poor to start failed.) to store a whopping 10kbyts with an access time of about 400ms. I wouldn't mind finding an old drum again. Allison

19 years, 2 months

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test-drb June 2005