test-drb January 2005

test-drb@ccmp.vtda.org

254 participants
551 discussions

by dwight.elvey＠amd.com

Hi Both right but it really depends on usage. Dwight >From: "der Mouse" <mouse(a)rodents.montreal.qc.ca> > >>>> Wired-OR will work fine for open-collector output TTL. >>> Well, except you generally get wired-AND, because the open >>> collectors are generally NPN collectors with emitters to ground, not >>> PNP collectors with emitters to Vcc. >> That is twice you've tried to make this point. If a signal is viewed >> as active low, then what is going on is logically wired-or. > >Yes...but would you call (? of) a 7408 an OR gate if it happens to be >manipulating such signals? That's the sense in which I say it's >wired-AND: the resulting signal is what you'd get from feeding the same >logic levels (except with pullups, or non-OC outputs) into the gate >usually called an AND gate. > >/~\ The ASCII der Mouse >\ / Ribbon Campaign > X Against HTML mouse(a)rodents.montreal.qc.ca >/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B >

19 years, 7 months

Kinetic's FastPath 4's

by brad＠heeltoe.com

Ok, here's the FastPath software I promised: (what an odd trick of fate that *I* would be doing this; yee gods! How come no asks for gatorbox software? :-) http://www.heeltoe.com/download/shiva/FastPath/ download/shiva/FastPath/shiva-ftp/distrib/fastpath/9.2/NewFeatures.txt download/shiva/FastPath/shiva-ftp/distrib/fastpath/9.2/fp92.sea.bin I can't say what runs in a FP-4 vs a FP-5, sorry. You might start with the 8.1.1 on a FP-4. Also, in case it's not obvious I'd use something like "unstuffit" to deal with the .sea.bin files. -brad

19 years, 7 months

AIM65 with unknown second board

by julesrichardsonuk＠yahoo.co.uk

Afternoon... We were given an AIM65 the other day (first time I've seen a real one) in a rather fetching custom blue case that has a carry handle on one edge. It was apparently used by Xerox for some for of magnetic media testing way back when; it still carries a Xerox asset tag on the back. Unfortunately in between the previous owner saying they wanted it when it was retired and them going to collect it, it got thrown into a skip - so there's some damage to the case and the red display cover needs replacing. Luckily the electronics survived, apart from one broken switch. Curious thing about the machine is that it has a second board mounted under the main board, containing quite a bit of circuitry. I was wondering whether this second board is something custom produced by Xerox (there are no marks indicating manufacturer) or whether it was an official off-the-shelf expansion board... Quick and dirty pics at: http://www.moosenet.demon.co.uk/temp/comps/aim65/ Wish I'd brought the machine home now, but I can get a list of the main ICs on that second board when I'm next at the musuem if needs be. Note that there seems to be no RAM on the AIM65 board itself, - just ROM - but there are 16 4116 chips on the expansion board. cheers Jules

19 years, 7 months

Intel bubble memory kit, BPK70A (7110A)

by tomj＠wps.com

They're all megabit devices. So whattaya call these things, megabubbles? I got a dozen or so of these kits, new unused and unopened, mostly, they include all the oddball support chips and the funny muonting brackets for the bubblebucket. 1984 and 1985 date codes. Any interest in them? I'll likely eBay them for money, but I'm willing to trade (I need a working 8" double-sided floppy drive, ugly OK). Anyone have, or willing to work up, a PCB to make them usable? Parallel interface would be nice.

19 years, 7 months

NEC APC III, anyone have one?

by dlearyfun＠adelphia.net

I too have an original APC with graphics board and all documentation. It still works. Dick Leary

19 years, 7 months

Quadlink by Quadram - put an Apple II in you PC

by CCTalk＠catcorner.org

OK, this came to me by a rather circuitous route, but I now have a new in the box Quadlink by Quadram. It includes all the cables, software, and documentation (the warranty card is still there). This card is essentially and Apple II/Apple II+ on an 8-bit ISA plug in board. I don't know how compatible it is with today's PC equipment. Anyway, the point of this is: Does anyone want this? Contact me off list if so. Shipping would be from New Jersey, USA. I'm always looking for old Tandy items in trade too. Kelly

19 years, 7 months

Error codes for 11/73

by Richardkurtz＠prodigy.net

I'm sure this is a familiar question to many - does anyone have a list of the two-digit codes displayed on the PDP11-73 during power-up ? I am resurrecting a dormant unit which stops at '1' (I have only the CPU and memory installed in the backplane) I'm not sure if this is a good or a bad code. Any help would be appreciated. Thanks, David Comley Dave, the Error Code 1 = cpu error 1. Make sure that your cpu diag switches are correctly set 2. Make sure your +5vdc and +12vdc power supply is good 3. Make sure your eproms do not have any bent pins J Richardkurtz(a)prodigy.net

19 years, 7 months

Importing binary files without removable storage nor non-bundled software (was: TKermitFTP

by pete＠dunnington.u-net.com

On Jan 6 2005, 9:30, Vintage Computer Festival wrote: > On Thu, 6 Jan 2005, Dwight K. Elvey wrote: > > > >And the programmers were not smart enough to figure a way around this > > >because...why? > > > > It would have been trivial for them to adopt a simple > > block transfer for serial binary at the begining. I suspect > > that the reason they didn't do this was that they didn't > > wan't people to transfer programs from machine to machine. > Your theory would make sense in an alternate universe where the floppy > disk was never invented ;) I think the reason is simpler than Dwight implies, and more along the lines of John's comment. Microsoft were in a hurry to make DOS work for IBM, and there was simply no perceived need to add the functionality. If you look at CP/M-related and Apple ][ systems, you see they had (er, have) the same problem: no out-of-band way to signal end of file. Several versions of kermit for Z80 machines and Apple ][s therefore come with a little program to talk from a remote machine to the serial port, start debug or equivalent, and stuff an ASCII-converted copy of kermit over which debug then saves in executable format. I've still got the ASCII HEX files for an Apple ][. As far as I remmeber there are two ways to get Kermit-65 onto an Apple. The first way is to type "IN#2" to set he serial card as the input, and then on the remote machine give the command to send the main file. It starts with "CALL -151" to jump into the monitor, and then follows that with a series of lines like "E00:38 A5"... which cause those bytes to be stored in memory; then it calls the code it's just stuffed in, and that in turn loads a huge number of much more compact (no addresses, no spaces) lines, before finally issuing a "3D0G" to get back to BASIC. Ditto for the serial card driver's HEX file. Finally you type "PR#6" so output goes to the disk, and you EXEC the two HEX files to create the actual binary as a disk file. Easy ;-) The other way is superficially simpler; you type IN#2, transmit a small file which creates a BASIC program and runs it; that program receives and saves the two HEX files, and then tells you what to do with them. Seems slightly simpler, but actually takes a lot longer, as I recall. -- Pete Peter Turnbull Network Manager University of York

19 years, 7 months

RTL Logic

by melamy＠earthlink.net

actually you can wire-or with diodes as long as you pay attention to the "higher" low logic level. Naturally, the voltage is not TTL compatible, but I have used that technique also. As for totem pole vs open collector, that is why I mentioned reading the specs rather than getting more technical with output types. I don't think anyone is going to whip out their TTL chips and start connecting them up to see which one works and which one doesn't. -----Original Message----- From: Scott Stevens <chenmel(a)earthlink.net> Sent: Jan 7, 2005 10:33 PM To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk(a)classiccmp.org> Subject: Re: RTL Logic On Fri, 7 Jan 2005 12:59:57 -0800 (PST) Tom Jennings <tomj(a)wps.com> wrote: > On Fri, 7 Jan 2005, Steve Thatcher wrote: > > > dirt has been known to be found in most places in the world... > > > > doing a wired-or and wired-and depends on reading IC specifications > > for specific chips. It is what design engineers do... > > Sorry for being so obtuse! Phrase meant: "wire OR/etc was very > common in RTL". > > I tried wired-OR once in TTL, didn't like the results :-) > Wired-OR will work fine for open-collector output TTL. It will fail miserably with totem-pole output parts. A 'battle of the transistors' will ensue and one output or another will win.

19 years, 7 months

Quadlink by Quadram - put an Apple II in you PC

by CCTalk＠catcorner.org

> -----Original Message----- > From: Kelly Leavitt [mailto:CCTalk@catcorner.org] > > > OK, this came to me by a rather circuitous route, but I now > have a new in > the box Quadlink by Quadram. It includes all the cables, software, and > documentation (the warranty card is still there). > > This card is essentially and Apple II/Apple II+ on an 8-bit > ISA plug in > board. I don't know how compatible it is with today's PC > equipment. Anyway, > the point of this is: Does anyone want this? Contact me off > list if so. > Shipping would be from New Jersey, USA. > > I'm always looking for old Tandy items in trade too. > > > Kelly > Man, sure seemed to be a lot of interest in this. Maybe I should have tried EPay ;-) Anyway, someone that has been helping me a lot with getting an old Quadra running has asked for this. It is officially his. I guess I should have asked him privately FIRST. In the same lot is a bunch of other interesting stuff. I have to inventory it yet, and see what is running, but I know of at least: A 5155 (one of the luggables) with dual floppies, an IBM PC reference set A 5150 (with dual floppies and a 20M drive (with cassette port)), lots of NIB software and docs. A largish 8 bit memory expansion card. A "turbo" XT Clone Anyway, I'll be listing this stuff as available once I have inventoried it and know what is running and what is not. As for the Tandy stuff I collect: My main interest is in the old II/12/16/6000 line running Xenix Thanks for all the interest. Kelly

19 years, 7 months

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test-drb January 2005