test-drb October 2001

test-drb@ccmp.vtda.org

259 participants
770 discussions

by mranalog＠home.com

John Allain wrote: > While cleaning up some garage space (yes, so a Car could > go in there) I came across a cache of some things I knew I > had and one thing I forgot. > A 2 tube module.from George A. Philbrick Researches Inc. > It's a GAP/R K2-W with "computor" tubes in it. > > Before anybody vomits (as regards computor) could > somebody remind me who Philbrick was? > The name seems familliar. TIA 1946 George A. Philbrick Researches Inc. (GAP/R) founded by George Arthur Philbrick, electronic analog computer pioneer. The company produced many innovating electronic analog computer designs. During the 50's and early 60's they had the opamp market pretty much all sewn up. 1966 Merged into Teledyne Philbrick Nexus, Which became Teledyne Philbrick, Which became Teledyne Components, 1993 Became TelCom Semiconductor. The K2-W was the first commercially available opamp. Open loop gain of 15,000. Power requirements are 4.5 ma at +300VDC and -300 VDC, and .6 amp at 6.3 volts AC or DC (tube heaters). Input and output voltage range -50VDC to +50VDC. Input current is less than .1ua. Early ones had a case of brown bakelite, later ones had a grey plastic case. I can send you a data sheet. Regards, --Doug ========================================= Doug Coward @ home in Poulsbo, WA Analog Computer Online Museum and History Center http://www.best.com/~dcoward/analog =========================================

23 years, 2 months

[possibly OT]: Citizen 120D+ interface connector and Acorn System questions

by philpem＠bigfoot.com

On Thu, 11 Oct 2001 23:06:34 +0100 (BST) ard(a)p850ug1.demon.co.uk (Tony Duell) wrote: > > BTW, anyone got a schematic for the Acorn Teletext Video card for the Acorn > > System-series machines? > > Is this some kind of trick question? Yes, I have it, open in front of me. > Got most of the other System schematics as well... Would you mind scanning and uploading the Teletext Video Card schematics for me? Preferably in PNG or some other lossless format at +/-300DPI. Thanks. -- Phil. philpem(a)bigfoot.com http://www.philpem.f9.co.uk/

23 years, 2 months

Phonemark/Entrepo Quick Data Drive

by philpem＠bigfoot.com

Hi, My old Citizen 120D+ is back from the dead (thanks to some 0.71mm tinned copper wire and a bit of fiddling with my soldering iron) and I've got another query. A while ago I got a Phonemark "Quick Data Drive", aparrently made by Entrepo. It uses small endless-loop tape cartridges called "Wafers" (any relation to the Rotronics Wafadrive? hmm...). Without the Master QOS Wafer or the blank wafer that were supposed to come with it. Anyone care to tell me where I can get these tapes? Also, without the QOS wafer, I can't get my VIC-20 to work with it. Anyone want to hook a QDD up to a PC and transfer QOS to a T64 (tape) file for me? I've had the cover off, and it appears to use a small-ish black plastic mechanism with "BSR" printed on it. This mechanism looks (from the front) exactly like the ones on the Rotronics Wafadrive. Anyone know if Wafadrive cartridges will work with it? Anyone know where to get Wafadrive cartridges? I _know_ this thing will work on a VIC-20, but without the QOS wafer or a blank wafer I'm stuck. Is the tape inside these carts normal C-30 "Computer Tape"? Anyone care to sacrifice one and take pictures and measurements? A 2D CAD drawing of the tape would be nice (I can get good-quality C60s relatively easily, I just need to know how the wafers are assembled). Thanks again. -- Phil. philpem(a)bigfoot.com http://www.philpem.f9.co.uk/

23 years, 2 months

Moving in 12 days....

by technos＠nerdland.org

Unless you've got a stockpile of DEC and/or Atari you haven't shared, your number is safe with us. Jim On Friday, October 12, 2001 10:38 PM, Curt Vendel [SMTP:curt@atari-history.com] wrote: > Hi Sean, > > Wanted to update my information with you, I'm moving in my new house in 12 > days, here's my new info: > > Curt Vendel > 117 Duke Drive > Carmel, NY 10512 > (845)-225-9793 (voice) > (845)-225-9794 (Fax) > > > Curt

23 years, 2 months

SCSI pros & cons

by acme_ent＠bellsouth.net

> Glen Goodwin skrev: > > >Hmm -- my personal experience is that, unless the machine is already > >junked-up with a random assortment of TV and radio tuner cards, video > >accelerators, SoundBlasters and DVD decoders, SCSI is easily added to a > >motherboard with onboard IDE ports. I've personally built a few dozen of > >them, using both IDE and PCI SCSI controllers. > > >What sorts of problems are you encountering? Iggy Drougge replied: > You're welcome to try to sort out our pile of SCSI cards which so far haven't > worked in our OpenBSD machine. One machine, or many? If you have a pile of cards, one machine, and none of the cards work in that specific box, I'd suggest that there may be a fault in the box, or another device in there which conflicts with your SCSI cards. > We don't use PCI cards, though (we sold that > one, since we wouldn't use the SCSI for anything else than tapestreamers and > so forth). Besides, SCSI integration into PC systems is really clumsy. Wow - these days the BIOS setup utility on the cards allows a lot of flexibility and also provides information about the installed SCSI devices, making it easy to verify IDs, etc. A few years ago I was building 80MHz 486 systems using Rancho Technologies RT1000 8-bit SCSI cards which I got for about $8 each. The cards were shipped labeled "not Win95 compatible," but, not only did they work with Win95, I never saw a faulty card, or a system in which the RT1000 wouldn't work. (Okay, so they were *slow*) So, my SCSI experiences have been good. > and they don't behave like the IDE hard drives. Well, that's the point, right? ;>) > They > have their own little BIOSes and things which I'm not used to from other > systems. Those little BIOSes (the ones with a setup program) are a *big* advantage. Just today I was cursing the fact that the BIOS on the ATA-66 controller I was installing didn't have a setup program. It took me two hours to get all six IDE drives working properly. With a decent SCSI card it would have been 15 minutes, tops (barring any bad drives or cables). > In fact, non-PC systems tend to see IDE as a kind of bastard SCSI > instead. They may be onto something there . . . Glen 0/0

23 years, 2 months

Apple ][ disk controller state machine

by dhquebbeman＠theestopinalgroup.com

> Until I get my hands on a copy of the venerable "Beneath Apple Dos" > is there anyone who can point me to an online resource describing the > Apple ][ disk controller P6 ROM state machine? The exact uses > for the Q6 and Q7 switches ($C0EC-$C0EF)? Or would be willing to > summarize from the mighty tome for me? From: http://www.mac.linux-m68k.org/devel/iwm.php : ======================= : Accessing IWM Registers : ======================= : The IWM chip has several internal registers available to programs. : Access to these registers is controlled by the Q6 and Q7 switches. : : +=====+=====+=======================================+ : | Q6 | Q7 | Register | : +=====+=====+=======================================+ : | off | off | Read data register | : +-----+-----+---------------------------------------+ : | off | on | Read handshake register | : +-----+-----+---------------------------------------+ : | on | off | Read status register | : +-----+-----+---------------------------------------+ : | on | on | Write mode register (if drive is off) | : | | | data register (if drive is on) | : +-----+-----+---------------------------------------+ : : The mode register is a write-only register containing several flag bits : which control various features if the IWM. To access it, turn off the : drive (by accessing ENABLE), turn on Q6 and Q7, and write to any : odd-numbered address in the $C0E0...$C0EF range. hth, -dq

23 years, 2 months

Levco Macintosh Transputer on Ebay

by rmeenaks＠olf.com

Hi, Here is a link to a Levco Macintosh Transputer board on ebay. http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1284357549 I am not connected to this listing, just passing on the information. I have some information on this board if anyone is interested, but I do not have any drivers for it. If anyone has them, I'll be happy to host them on my website.... Cheers, Ram -- ,,,, /'^'\ ( o o ) -oOOO--(_)--OOOo------------------------------------- | Ram Meenakshisundaram | | Senior Software Engineer | | OpenLink Financial Inc | | .oooO Phone: (516) 227-6600 x267 | | ( ) Oooo. Email: rmeenaks(a)olf.com | ---\ (----( )-------------------------------------- \_) ) / (_/

23 years, 2 months

Sigma Designs OneReel Tape

by dhquebbeman＠theestopinalgroup.com

> >I'd like to hear more about this SCSI monitor - was it data over SCSI, or > >some kind of control thing, or what? > > It actually got all its data over SCSI. I suppose its main application was the > very oldest compact Macs which didn't even have any PDS slot. Forgot to mention... There were SCSI-interfaced Ethernet adapters for SCSI-equipped Macs... got one of those, too... -dq

23 years, 2 months

Free unknown keyboard

by Innfogra＠aol.com

The keyboard is for Data General Terminals, I recognize it. I could possibly help IDing the terminal if anyone is interested. I have no interest but maybe some of the DG people on the list do. Paxton Astoria, OR

23 years, 2 months

Free unknown keyboard

by mythtech＠Mac.com

Since I know people on this group like odd computer parts, I figured I would offer these here: I have 4 unknown keyboards available. They are tan and look like they might have come from some terminal system. They have a DB9 (DE9, ahh... D9) Male connector on it, and carry a part number 6246-A. No mention of who makes it, or what system they came from. I don't know if they work, I don't know anything about them at all. All 4 are rather dirty, and one of them is missing the key cap for what looks like two tildes and a backwards comma key. I recieved them as part of a ship test. (I work for a market research company, and one of the major shippers was doing a test with us, to see how the package made it thru shipping... so we recieved two shipments of 2 keyboards each... the shipper doesn't want them back) You can see a picture of one at <http://www.mythtech.net/keyboard.jpg>. I will hang onto them until monday, but after that, they are being dumpstered. If anyone wants them, they are up for grabs, they would be mailed out of 07450. A single keyboard weighs 6 lbs, figure add another pound for the box and bubble wrap to be safe. I can take PayPal to cover shipping costs, or they can be picked up in Ridgewood, NJ. -chris <http://www.mythtech.net>

23 years, 2 months

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test-drb October 2001