Re: Parasitic Engineering Altair Clock Fix Kit...
On Sat, Feb 22, 2020 at 1:37 AM Mike Douglas via cctalk < cctalk@classiccmp.org> wrote: > I scanned my Parasitic clock mod documents and put them at the link below. > > https://deramp.com/downloads/altair/hardware/altair_8800_computer/Parasitic%20Clock%20Mod.pdf > Thanks for that! Does anyone have a datasheet for the "94618" dual non-retriggerable monostable that Parasitic used to replace the 74123? At first I thought the P/N was likely to be Fairchild, but I couldn't find either a 94618, nor a dual non-retriggerable with similar pinout from Fairchild. 94618 doesn't show up in the IC Master editiions of that era, either, nor can I find it from any of the usual internet sources. A photo of the chip from the actual Parasitic clock mod might help identify the vendor. The 74221 and 74LS221 are dual non-retriggerable monostables with the same pinout as the 74123/74LS123, but require the reverse capacitor polarity (if using polarized capacitors), and require different RC values than the 74LS123. With appropriate RC values it might make a suitable clock fix if the 94618 can't be found. It's possible that it might use the same RC values as the 94618, but without the datasheet for the 94618 it's hard to tell. Parasitic mentioned that the 94618 has temperature -compensation and schmitt trigger inputs, and the 74221/74S221 do have both of those features. The 74LS221 doesn't have as much input hysteresis for the schmitt trigger inputs, so the 74221 might be preferred.
Re: Seeking Zenith Data Systems Z183-92 documentation
On Mon, 24 Feb 2020, Eric Christopherson wrote: I picked up a ZDS Z183-92 laptop over the weekend alongside a Kodak Diconix 150 portable inkjet printer. Is that close to a ZWL-183-93? My partner just picked up one of those, and its brick can be described as: Model 150-308 DC 16.5v 2A Center neg I genuinely have no idea, you would certainly think so, wouldn't you? It's definitely centre-negative (given it works on the Diconix supply which is the same). I do actually have several 16.5V supplies from other old laptops, but I'm seriously hesitant to throw something that may be too high into it when it appears to identify itself as "12V" - regardless, it's another data point, thank you very much. I suppose I should open it up and inspect the PCB for any identifying markings, but I'm off to San Diego for work for the next few days and I don't want to take it to bits and not have the time to properly clean it up and put it back together again before I go... the memory isn't good enough to be confident I'll remember how it went together a week later :) Cheers! - JP
Re: Seeking Zenith Data Systems Z183-92 documentation
On Mon, Feb 24, 2020 at 1:50 PM JP Hindin via cctalk wrote: > > Good afternoon all; > > I picked up a ZDS Z183-92 laptop over the weekend alongside a Kodak > Diconix 150 portable inkjet printer. > > The prior owner doesn't think he ever had a power supply for the Z183, > although he discovered that it does power up sort-of from the Diconix > power supply wallwart(!) > > The underside of the laptop has "12V" - and nothing else - so my > assumption is I need to find a 12V pack of suitable amperage. The Diconix > supply is 9VDC. The 9VDC is enough to bring up the LCD and at least some > of the internals (presumably the +5v ones) to have it _appear_ to POST, > but neither of the disks sound like they're running (either the internal > HDD or the 3.5" drive). I presume the internal HDD requires the +12v to > spin up, but I haven't dug into it yet. > > Anywho - if anyone had any documentation on this machine I would very much > appreciate a scan. Or just confirmation what the power supply is supposed > to be outputting would be very helpful. > > Thank you! > > - JP > 50441 > Is that close to a ZWL-183-93? My partner just picked up one of those, and its brick can be described as: Model 150-308 DC 16.5v 2A Center neg -- Eric Christopherson
Seeking Zenith Data Systems Z183-92 documentation
Good afternoon all; I picked up a ZDS Z183-92 laptop over the weekend alongside a Kodak Diconix 150 portable inkjet printer. The prior owner doesn't think he ever had a power supply for the Z183, although he discovered that it does power up sort-of from the Diconix power supply wallwart(!) The underside of the laptop has "12V" - and nothing else - so my assumption is I need to find a 12V pack of suitable amperage. The Diconix supply is 9VDC. The 9VDC is enough to bring up the LCD and at least some of the internals (presumably the +5v ones) to have it _appear_ to POST, but neither of the disks sound like they're running (either the internal HDD or the 3.5" drive). I presume the internal HDD requires the +12v to spin up, but I haven't dug into it yet. Anywho - if anyone had any documentation on this machine I would very much appreciate a scan. Or just confirmation what the power supply is supposed to be outputting would be very helpful. Thank you! - JP 50441
Classic computers, and peripherals offers in France
Hello list, this might be of interest for list members located in France (Normandie) or close to it: There is seller who offers different types of classic systems. Micros as well as larger systems andwhat appears to be a punched card sorter from the 50s. He writes that he has more stuff and that he can send pictures upon request. Descriptions are in French, but google translate might help out... https://www.leboncoin.fr/recherche/?text=Informatique%20vintage=Bernay_27300__49.10325_0.58486_6186 Cheers, Pierre - http://www.digitalheritage.de
Re: HP 9000 Series 360 Thin LAN
On Fri, 21 Feb 2020 at 19:20, Roger Addy via cctech wrote: > > I'm > wondering if it's possible to connect it to a modern ethernet network? Run a single piece of thin Ethernet into the back of an old 10base-T hub. Cable the hub into a modern switch. Job done. -- Liam Proven - Profile: https://about.me/liamproven Email: lpro...@cix.co.uk - Google Mail/Hangouts/Plus: lpro...@gmail.com Twitter/Facebook/Flickr: lproven - Skype/LinkedIn: liamproven UK: +44 7939-087884 - ČR (+ WhatsApp/Telegram/Signal): +420 702 829 053
