Re: Vintage Computer Warehouse Liquidation
In for a vt100 whenever for sale. Sent from my iPhone > On 22 Sep 2019, at 21:40, Thomas Raguso via cctalk > wrote: > > This is my first of many posts that I will make about this sale. > > I am liquidating a large warehouse filled with vintage computers including > Apple, DEC, IBM, Commodore, Tandy/Radio Shack, HP, and more. Many items are > currently inaccessible due to large piles of junk and video games. > > So far, I have found: > > Apple Lisa 2 > Tandy 6000 HD > IBM 5251 Keyboard > MicroVAX 3900 (currently inaccessible) > MicroVAX II (currently inaccessible) > Cromemco System One > Ohio Scientific Challenger 2p > Lots of Apple II series > IBM 5110 > Piles of VT100s > Even more VT220, VT320 > Northstar Advantage > Osborne 1 > Various Kaypros > PC clones > Commodore B-Series > Just about every kind of TRS-80 > IBM XT with monitor in box > NeXT cube > Almost every type of Macintosh > Amigas > IBM PS/2 P70 > HP 3000 (inaccessible) > 1970s HP computers > Boxes filled with Cromemco and Northstar manuals > A pallet of 1980s PC clones (inaccessible) > > Heaps of CRT monitors > > Mechanical Keyboards > At least 20 Apple Extended Keyboard II's > > I have barely scratched the surface of the warehouse, and will keep you > updated when I find more items, or am able to move the large systems. > > The DEC terminals are not yet for sale, since I have not yet found the > keyboards. > > I am not taking offers on the entire warehouse at this time. > > Please feel free to text me with questions > > > Thomas Raguso > > (832) 374-2803
Re: PDP-11/40 available, Arizona
Great! Good luck with the visit. The other day I wrote to Kristina to express interest. > On 11 May 2019, at 04:38, Fritz Mueller via cctalk > wrote: > > >> On 5/10/19 6:42 PM, Adam Thornton via cctech wrote: >> I have been invited out to the site tomorrow morning to take an inventory of >> what’s there (I live near the machines). >> I imagine that I may well have a lot of photos that I bring to the list and >> say “what is this?” > > Standing by to help out! Go get it, Adam -- (come on, you can _make_ room! > :-))
Re: PDP-11/40 available, Arizona
Im interested. Thx Sent from my iPhone > On 9 May 2019, at 19:14, Josh Dersch via cctalk wrote: > > I have no affiliation with the person who owns these items, I'm merely > relaying information. These machines were offered to the LCM+L but we've > met our 11/40 quota :). We figured someone here might be able to provide a > good home, and the seller asked us to pass the offer along. Contact > information is below: > > Email: > kristina.k...@mac.com > > List of items offered: > DEC PDP 11/40 from approx 1973 > Other associated equipment may include punch card machine (key punch), tape > drive(s), free standing dot matrix printer, terminals (approx. 12). > > Condition of items: > Very good condition. Running or close to running. Most peripherals have > been offline and stored. > > How have these items been used and/or stored?: > Running in filtered air. Desert, dry climate. > > Extent or weight of these items: > The DEC PDP is 6-8 cabinets.
Re: Datasheet for a NEC Chip in DEC Professional 350
A constant pulsing reset is usually a watchdog at play. Hardware watchdogs are usually implemented in systems to reset everything should the system not meet one specific criteria: eg cpu touch one memory address before X amount of time, or pcb voltage lower than X volts, etc. Watchdogs are also usually found as software routines executed by the cpu also looking for specific conditions. These rarely issue a reset hardware signal, just restar the program. Sent from my iPhone > On 4 Nov 2018, at 14:10, Rob Jarratt via cctalk wrote: > > >> -Original Message- >> From: Tony Duell [mailto:ard.p850...@gmail.com] >> Sent: 04 November 2018 12:42 >> To: r...@jarratt.me.uk; Jarratt RMA ; General >> Discussion: On-Topic and Off-Topic Posts >> Subject: Re: Datasheet for a NEC Chip in DEC Professional 350 >> >> On Sun, Nov 4, 2018 at 12:37 PM Rob Jarratt via cctalk >> wrote: >>> >>> I have posted previously about a DEC Pro 350 I am trying to get >>> working again. At the moment it seems to be constantly resetting the CPU. >>> >>> >>> >>> I have traced one possible path for the cause of this back to a NEC >>> chip for which I cannot find a datasheet. It is a 40-pin DIP it is >>> marked "NEC Japan >>> 8239K6 D7201C". All I have been able to find is more modern USB host >>> controllers. >> >> Almost certainly a uPD7201 multi-protocol (asynchronous and synchronous) >> serial chip. I have an NEC data book with it in if all else fails but a >> google >> search for 'uPD7201 datasheet' (no quotes) found sites with the data sheet >> to download as a .pdf file. >> >> Quite why that should reset the machine is beyond me > > I have been trying to find what is driving this path in the logic and this > chip was the only one I for which I couldn't identify the pins, but it seems > that from this datasheet > (https://datasheet4u.com/datasheet-pdf-file/1098405/NEC/UPD7201/1) they are > all inputs and not outputs. So I need to look again for an output pin that is > driving this signal. > > Thanks > > Rob >
