test-drb December 2007

test-drb@ccmp.vtda.org

215 participants
420 discussions

by ajp166＠bellatlantic.net

> >Subject: Re: Hazeltine 1200 > From: Dave McGuire <mcguire at neurotica.com> > Date: Fri, 07 Dec 2007 00:54:03 -0500 > To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> > >On Dec 6, 2007, at 4:22 PM, Tony Duell wrote: >>> I'm also curious about what processor it's built around, if you >>> don't mind checking. >> >> Why does it have to have a processor at all? A number of the older >> terminals, both 'glass TTYs' and those with some limited control code >> response, like cursor positioning, were built from simple TTL (etc) >> chips. Sometimes the artchitecture was something like a processor (DEC >> VT5x, for example), sometimes it was just random logic. > > Of course it doesn't *need* to have a processor in the traditional >sense...I was just assuming that it would, as I was guessing it wasn't >much older than 1420 I had years ago. I could certainly be wrong. It's much older than 14xx maybe at least two generations. Actually the 14xx series was near the end of the line for Hazeltine designs and I remember being then for it in mid 78. By then they almost had the 15xx series working in production. Allison > -Dave > >-- >Dave McGuire >Port Charlotte, FL

17 years

CDC 5 1/4 floppy 77711501 / 77711800 specs, update

by g-wright＠att.net

-------------- Original message from "Chuck Guzis" <cclist at sydex.com>: -------------- > Well, I can tell you that MPI made 100 tpi FH drives--I have two of > them on my shelf here, date codes are 81-82. Unfortunately, the > labels have dried up and dropped off, so I no longer have any idea of > what their part number is. I've also got a couple in another > machine, but it's a bear to get at them. > > Does the drive have a little "daughterboard" plugged into the main > PCB with a 74ls123 on it? That'd be the "Drive Ready' circuit. I > don't know if all MPI 100 tpi drives had this though. > > "Micropolis" type 100tpi drives also have a slightly different pinout > than normal "Shugart" type drives (this includes the Tandon TM-100- > 4M). A big difference is that READY is pin 6, not 34. Maybe that's > what's causing your drive error. > > Just guessing... > > Cheers, > Chuck > Hi, Well Chuck and Paxton where right there. I took a chance and pulled a Quad denisity drive out of a Motorola system I got from Paxon (sorry Tony. I see your post) and all is well. It took 16 disks to back up close to 10 megs. I had to bulk erase the disks (DSDD) for them to work with either drive. Anadisk finds 80 cylinders and is able to read the whole floppy with out errors ( using a 1.2HD drive.) I have not workd with Image disk yet. I'm still out in the dark on the OS and how to make a bootable floppy. I cant get past there Menu system It seems to run on or with some type of basic. Below is a Boot screen for those with interest. The System is a small desk top 6 serial port business system. Thanks, Jerry ...................................................... <I-TIMERS><I-USARTS><I-PIC'S ><I-DMA'S > BOOTSTRAP LOADER VER 120A 31MAR83 S/N:000794 <I-TIMERS><I-USARTS><I-PIC'S ><I-DMA'S > <I-FLOPPY><I-MEM&CH><MEM DATA><MEM BANK> <MEM ADDR><HD SETUP><HD READI><VFY INCP> <HD READL><VFY LOAD> STARDOS SYSTEM UTILITIES REV 242B 10JAN84 STARDOS BASIC LOADER 1) ENTER MASTER MENU 2) ENTER SYSTEM UTILITIES MENU ENTER YOUR CHOICE 2 ########################################### # STARDOS SYSTEM UTILITIES - VERSION 242B # ########################################### 1) ENTER MASTER MENU 2) INITIALIZE DEVICE 3) COPY DISKETTE 4) COPY STARDOS 5) RECONFIGURE 6) BINARY BACKUP HARD DISK 7) BINARY RESTORE HARD DISK 8) INITIALIZE FILE SAVE DISKETTE 9) HARDWARE CONFIGURATION ENTER YOUR CHOICE 1 *** S T A R D O S II *** BASIC RELEASE 10.7 REV C 05JUN84 snip.................................................

17 years

ROM image for NEC PC-8300

by dm561＠torfree.net

-----------Original Message: Date: Mon, 03 Dec 2007 16:32:18 -0800 From: Josh Dersch <derschjo at msu.edu> Subject: ROM image for NEC PC-8300 Anyone out there have a ROM image for the NEC PC-8300? This is NEC's variant of the Kyocera KC 85, of which the TRS-80 Model 100 was another. I picked up two of these a long time ago, they had been used as some sort of data-logging system and had custom ROMs in them which are useless without special hardware I don't have :). Now that I have a functional EPROM burner I can get this running in its native state, if only I can find the right ROM for it. Can't seem to find this on the 'net. Thanks for any pointers... Josh ----------Reply: Go to: http://www.diginexus.com/web8201/ and get in touch with Gary at the link there; he's Mr. NEC and will have it for you and he's also a nice guy who'll gladly help you with any other NEC issues you may have. mike

17 years

Almost OT: Pushbutton switch latching

by dm561＠torfree.net

-----------Original Messages: Date: Thu, 6 Dec 2007 22:06:49 -0800 From: dwight elvey <dkelvey at hotmail.com> Subject: RE: Almost OT: Pushbutton switch latching > From: ian_primus at yahoo.com > The main thing I'm trying to achieve is simplicity. > Nothing fancy. No PIC's, no microcontrollers, etc. I > initially thought of using flip flops and a bunch of > inverters to reset all the non-selected flip flop, but > couldn't work out in my head a good way to do it... I > hadn't taken switch debouncing into the equation - but > aren't flip flops commonly used to debounce switches > anyway? > Hi The simplest method would be to use the cross coupled nands as another described. For 8 inputs, you'll need 4 ea 7400's to make the nand latches. You'l need 8 ea 8 input nands ( forget the 74 number ) and 3 of the hex inverters, 7404s. For each switch wire one lead to ground. Wire one lead to a 4.7K pullup resistor and one of the free inputs to the cross coupled nand pair. Also wire that switch lead to 7 of the 8 input nands ( not the one on this switch circuit. ). On the remaining free inputs to the cross coupled nands pair, wire an inverters output. The input of the inverter goes to the output of the 8 input nand that wasn't one of the 7 connected to this switch. Repeat this for each of the 8 switches. If the active level is to be 0 when selected, you can save one inverter IC. If it needs to be active high, you need the inverter. in either case, you need to connect to the nand that has the inverter to the 8 input nand. This will ensure that multiple switches won't select anything until only one is selected. On the 8 input nand, you'll notice that one input isn't connected. This can be used to reset. Tie all together with a 1K resistor to +5. Place a diode across this such that the band is on the +5 ended. Add a 10uf tantalum to this net with th plus on the same net and the negative to ground. This will reset all on powering up. If you want to one of the outputs to come on when powering up, you can add a similar capacitor, resistor and diode circuit to the desired input switch lead. You'd need to remove the common input to the 8 input nand and tie it to +5 as well. I like this better than using some other clocked method because if multiple switches are selected at the same time, non will select but when the last switch is still selected, that output will go active. There are no ambiguous states and no oscillations. The switches are debounced as well. Dwight ------------Reply: 15 ICs and a dozen discretes is "the simplest?" I think some simpler circuits have been suggested...;-) As a matter of fact, if you add a diode & cap per switch you could do the job with 2 IC's for each 8 PBs (7430 & '573 (or 2x'75 if you need complementary outputs)). mike

17 years

Haletine 2000 ? was Re: Hazeltine 1200

by dm561＠torfree.net

Date: Sun, 09 Dec 2007 15:55:19 -0500 From: "Roy J. Tellason" <rtellason at verizon.net> Subject: Re: Haletine 2000 ? was Re: Hazeltine 1200 To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <200712091555.19523.rtellason at verizon.net> Content-Type: text/plain; charset=iso-8859-1 On Sunday 09 December 2007 15:47, Richard wrote: >> In article <ded268c40712091038offab0fbg2bc611169d5c55b7 at mail.gmail.com>, >> >> "Paxton Hoag" <innfoclassics at gmail.com> writes: >> > So if you see one expect to pay for it. >> >> I had to outbid other Crommeco collectors for the Beehive. $350. >Dang! That Cromemco 3101 (?) I have sitting in storage is worth that much? >Whodathunkit... --------- And I gave one away... Lesson learned! m

17 years

Yet Another VT-100 Emulator

by dave06a＠dunfield.com

Hi Guys, Just thought I'd mention in case anyone is interested... Having recently acquired a couple of VAXen, I've taken the time to update my LAPTALK terminal program to provide MUCH more complete VT-100 emulation. This is a very small (<20k) DOS program, so you can use it to turn any old PC into a terminal. First the bad news - Like most PC/text based VT-100 emulators, it DOES NOT support: - Double width/Double height lines. - 132 column mode. - Split RX/TX speeds. The good news - It does support "most everything else" now. In fact, it's the only emulator I've tested which passes all of my "VT-100 Checkup" tests (excepting for the limitations mentioned above) - I've included the test program in the archive. It also adds a few extra features you might find useful: - Fairly power script language for automating sessions. - 40 programmable function keys (F1-F10, ShiftF1-F10, CtrlF1-F10 and AltF1-F10) with on-screen labels. (very handy!) - If you have a VGA display it will load a custom character set to provide the complete VT-100 character set including the graphics mode characters. I've also include a font editor so that you can create your own custom character sets if you like. I've made the package temporarily available at: http://www.dunfield.com/pub/index.htm If there's any interest, I'll find it a permanent home. Regards, Dave -- dave06a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html

17 years

CDC 5 1/4 floppy 77711501 / 77711800 specs

by g-wright＠att.net

-------------- Original message from Fred Cisin <cisin at xenosoft.com>: -------------- > On Sun, 9 Dec 2007 g-wright at att.net wrote: > > Hi > > I have a machine with a 77711501 floppy drive and it's bad.. I have > > tried 3 different 360k drives. I tried to find specs on it but so far have > not. > > What is the difference between that drive and a 77711800 used in a PC > > The computer just says there is a drive error. I'm using the same jumper > > settings on both. I have also tried a Teac fd-55bv. > > Is it a 320k drive ?? > > There ain't no difference. > 320K drive and 360K drive are the same drive. > > There is a way that it would be possible to build a drive that could do > 320K, but not be able to do 360K, but nobody has done so yet. > > Boot something other than WINDOZE. "Drive error" is not specific enough. > > > And for the rest of the story ..................... This is on a MicroStar machine that runs StarDos. I know nothing about this but from recent posts I decided to drag one of them down and look into it a little further. This machine I have running is a Micro Five 1000 with a IMI 10 meg HD. It has a boot menu and back up Menu. It will still boot and will make its own formatted floppies and back itself up with out much problems. If I try to read one of the floppies with Image disk or Anadisk they fail. It tried with both 360 and 1.2 meg drives. I would guess that the drive in the machine is off enough to cause these problems . If I install another floppy drive, the System picks up something and errors. So there must be some other signal or ??? coming from the drive. The machine date is in the 84 -85 range The straps on the drive (M 4 x 3 2 1 H) are set with M and 1 jumpered - thanks, Jerry

17 years

Almost OT: Pushbutton switch latching

by dm561＠torfree.net

------------Original Message: Date: Sat, 08 Dec 2007 23:50:29 -0800 From: "Chuck Guzis" <cclist at sydex.com> Subject: Re: Almost OT: Pushbutton switch latching On 9 Dec 2007 at 0:15, der Mouse wrote: > Nice idea, but it doesn't work. Draw out three NANDs cross-coupled as > you described. Mark the logic states for a stable state with one > output low. Now consider what happens when each of the inputs goes > low. The only one that does anything is the one feeding the gate whose > output is low. Yeah -- I see that. Release a button and the circuit goes into an unstable state. I wonder what the smallest number of active devices is for an n-stable circult with n greater than 2. 8 D flip=flops with each switch connected to a PRESET input and a NAND (or NOR) to edge-clock in a reset state looks to be far from the minimum. How about some capacitively coupled logic with a few steering diodes? Cheers, Chuck ---------------Reply: Well, with some diodes and caps, a single 8-bit latch (74564/574) oughta do the job. m

17 years

Free Magazines. was: Electronics Today International back issues

by Nick.Jarmany＠quixant.co.uk

Hi Rob, You may not remember but you posted the following on classiccmp.org about 2 years ago:- >I have a large pile of magazines dating back to the 70's-mid 80's, mostly >Hobby Electronics right from the start, quite a lot of ETI (but I don't >think as late as wanted here, box is buried behind a live server so will >take time to access and check) also a lot of Practical Electronics >including, if I still have them, many dating back to the '60s. Lots of >odds and ends too as to be expected, plus I think some Railway Modeling >mags to stray off topic.. I am writing this email on the off-chance you might still have these. I grew up with ETI as a child and kept all my magazines from mid-70?s until mid-80?s but unfortunately they were all thrown out when my parents moved house. I found your post (and the classiccmp.org forum ) from a Google for Electronics Today International. I am trying to get hold of as many of the magazines from this era as possible. I am particularly hoping to be able to find the issues that covered the ETI System68, which I built when I was 16. Ideally I would like to find these and get them scanned, approach the current copyright owners and see if they would agree to PDF?s of these magazines being made available online. I would also like to try and re-build this design if at all possible. Anyway, hope to hear from you. Regards, Nick Jarmany London No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.16.17/1177 - Release Date: 07/12/2007 13:11

17 years

got this old peecee...

by rtellason＠verizon.net

And a few things I've noticed about it are: -- It says "digital" (lowercase like that) on the front. :-) -- it has a third power supply connector to the MB, and that PS is rated to ptu 33A (!) out on the +5 -- It has the CPU on a separate small daughterboard. A jumper there seems to select speeds, up to maybe 100 or so. I have a 486dx2/66 chip in it at present, which will run real flaky at 80, and not at all at 100. :-) -- It has a _very_ loud beep when you power it up. -- It wants only _parity_ ram -- there's no option in CMOS to disable that. I have a couple of 16s and a couple of 4s in there at present, all the parity parts I was able to scrounge. Anybody have some they might wanna trade? -- Slots are ISA only, but they're _all_ 16-bit. -- This thing's built like a tank! I'd originally planned to put OS/2 in this box. Now I'm lots less enthused about that OS than I was at one time, so I dunno what I'm gonna do with it. Thoughts on this? -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

17 years

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test-drb December 2007