test-drb March 2008

test-drb@ccmp.vtda.org

209 participants
369 discussions

by trebor72＠execpc.com

Is a IBM 5140 considered a Classic. I have one but one of the floppy drives is flacky. Got to find a replacement. I also seem to have mis-placed the Wall Wart. Not sure what the Voltage should be. TIA Bob in Wisconsin

16 years, 4 months

IBM 3088 - Dummy questions

by gerold.pauler＠gmx.net

Hello IBM folks, as an absolute (IBM) mainframe dummy I would like to know what an IBM 3088 was used for? I don't know anything about mainframes therefore many of the infos I found on the net don't give much meaning to me. Additional questions: Is its functionality limited to CTC? Can it be used as a standalone system, server, machine, ...? I am asking these questions because I might get hands on 3 of them and according to my contact 2 out of 3 are still NOS. So I wonder if I (as a DEC/Unix Guy) can make any use out of them. Thanks Gerold

16 years, 4 months

strange xtal frequencies

by jeffj＠panix.com

I have some strange frequency crystals and oscillators. Does anyone remember what "standard" they represent? 3.595295 MHz 13.824 MHz 18.72000 MHz

16 years, 4 months

UARTs (was: Switch settings: Facit 4070 tape punch)

by dm561＠torfree.net

>>> Difference between A and non-A is number of stop bits. >> In what way? The UARTs I am familiar with have a single pin that selects >> between either 1 or 2 stop bits (1 or 1.5 stop its if the word length is > 5 >> bits). What does the other type do? >> > -tony I my meant that the primary difference was that one could do 1.5 > stop bits while the other could do 2. There is also the differences in supply > voltages as mentioned by others. Still, as far as how they work, the data > sheet in the catalog I point to is more than I've seen in other places. > My IMSAI has the AMI chip. I recall programming it with just the pinouts. > Dwight --------- I'm afraid I have to disagree with you again, Dwight: According to the Marketing Memo from GI announcing the discontinuation of the AY-5-1013, the -A replacement is identical except for the higher max baud rate (in fact, it is a 5-1013 that has been tested to 40kb instead of 30). The AY-3-1014A (there was no 1014) and 1015 are the two UARTS that use 1 1/2 stop bits instead of 2 in 5 bit mode. Looks like this previous post of mine didn't make it, so I'll repost it here: AY-3-1014A* CMOS, 480kHz/30kb AY-3-1015* NMOS, 480kHz/30kb AY-5-1013 PMOS, 480kHz/30kb AY-5-1013A PMOS, 640kHz/40kb AY-6-1013 PMOS, 360kHz/22.5kb * = 1 1/2 Stop bits PMOS = +5 & +12V, NMOS = +5V only m

16 years, 4 months

End of restoration of the early French computer SEREL ODP-505 (germanium CPU)

by pichotjm＠free.fr

> From: "pichotjm" <pichotjm at free.fr> > > I spent my week-end to write a report on the restoration of the > early French > computer ODP-505. This computer is built with germanium transistors > and has > a core memory. |Thank you that is very interesting. | |I have looked on the 'Big List' to find the date it was first sold |but could not find it. Google only brings up pages in the French |language. Could you please give us the year? It is difficult for me to give a precise date. I don't have any manufacturing notes/schematics about this machine. Published computer lists indicate 1965. But they don't know my work. It seems that the machine began a military career, before a commercial one. (My machine has a military color, and a customs seal)And I think that the 1965 date is only for commercial use (not reserved to military).Date codes on PCBs range from 1962 to 1964. It's why I think 1964. But the machine was used for manufacturing problems debugging / ECN. 1964 may be the date of the last ECN... So the date is between 1962 and 1965.|It is tiny compared with my Germanium machine (ICT 1301) which weighs |five tons. It has the same clock speed but is quite a bit slower, so |I guess it is earlier than mine. But maybe the emphasis of the design |was miniaturisation and the designers traded speed for size. | |Roger Holmes |(Kent, England)What is the manufacturing date of your ICT 1301?I have a earlier machine from the same company SEREL, named OA-1001. Built in 1959/1960.I need to restore it. It lays on the floor (horizontal position)... The blue one here:http://pichotjm.free.fr/Serel/Photos/Photos.htmlI will start restoring next month (with the Sun!) RegardsJM PICHOT

16 years, 4 months

RSTS/E DECNET installation guides / pointers / tips?

by aek＠bitsavers.org

I just put the user's and manager's guide for DECnet/E V2 on bitsavers under http://bitsavers.org/pdf/dec/pdp11/rsts/DECnetE This was all I was able to come up with from the DEC archive at CHM.

16 years, 4 months

RSTS/E DECNET installation guides / pointers / tips?

by aek＠bitsavers.org

> I was just up in the "Stacks", and we have Volumes 1-4 http://elvira.stacken.kth.se/rstsdoc/ has most of the base RSTS/E documentation Is there any way to get the other three volumes of the DECnet material scanned?

16 years, 4 months

UARTs (was: Switch settings: Facit 4070 tape punch)

by dm561＠torfree.net

-------Original Message: Date: Thu, 13 Mar 2008 04:35:01 -0400 From: "Roy J. Tellason" <rtellason at verizon.net> Subject: Re: Switch settings: Facit 4070 tape punch On Thursday 13 March 2008 05:25, Brent Hilpert wrote: > "Roy J. Tellason" wrote: > > Anybody know who made those parts with numbers like AY-n-nnnn? I don't > > think I have much data on those offhand. > > General Instrument. Often there's a "GI" logo on their chips. Ah yes. Vague recollections were nudging me in that direction... :-) > Dennis Boone wrote: > > > > AY-5-1013 40 pin dip (cpu?) > > > > > > UART, I think. I know I've run into that number somewhere before. > > > > If the 14411 is a baud rate generator, then this must be a uart, > > especially as now that I look at the traces, the puzzling 8-pack > > switches 1-5 go right to it. > > (Yes, the AY-5-1013 is a hardware/switch/pin-configured UART. Can supply > pinout if needed.) That may be why I was recalling that number. The other one of those being what, a 6402 or similar? I'm thinking Standard Microsystems, for which I do have a databook someplace though I haven't seen it in ages. ----------Reply: Yes, those AA-N-NNNN numbers are GI; they made 6 or 7 versions of that UART, some dual-voltage PMOS and some 5V-only versions. The 6402 (Intersil, Harris etc.) was a pin-compatible 5V CMOS version. I've got a pretty complete set of GI datasheets, including their funky game chips etc. if anyone needs any info. m

16 years, 4 months

UARTs (was: Switch settings: Facit 4070 tape punch)

by cclist＠sydex.com

> Date: Thu, 13 Mar 2008 20:27:09 -0700 > From: dwight elvey > Hi > I posted this but I guess I'll post it again: > > http://www.bitsavers.org/pdf/standardMicrosystems/_dataBooks/1985_Standard > Microsystems.pdf > > AY-5-1013A = AMI S1883 = COM2017 page 91 > > AY-5-1013 = COM2502 page 91 Also WD TR1402, Signetics 2536 and TI TMS6011 IIRC, the 1013 was also used in the TV Typewriter. A very common sub for the 1013/1013a was the WD TR1602/1402. Thedifference between the 1402 and 1602 was that the 1602 can generate 1.5 stop bits; not so with the 1402. The TI TMS6011 is likewise a non-A (1 or 2, but not 1.5 stop bits) equivalent. Also the Signetics 2536. If you need a 5v only version, try the Fujitsu MB8868A or SMC COM8017 or COM8502. Same pinout and functionality. Cheers, Chuck

16 years, 4 months

Apple Scribe Printer

by Nopills2＠aol.com

But, before I get into opening it and regreasing it... I was seeing if anyone had a manual for it and can tell me what the blinking light indicates. When I turn it on, the Select Light blinks in patterns of three (three blinks, pause, three blinks, pause...). Do you still want a manual? Three blinks means there is a problem. Needs paper or print head is stuck or mosy commonly the ribbon cartridge is used up. pop the cartridge out and see if there is silver showing. If not advance the ribbon slightly and see if a silver band appears. Means you need a new ribbon. Do not try to print on the silver, willbhurt print head. **************It's Tax Time! Get tips, forms, and advice on AOL Money & Finance. (http://money.aol.com/tax?NCID=aolprf00030000000001)

16 years, 4 months

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test-drb March 2008