Re: Scrounging - was Floating point routines for the 6809

> > Or the time an English co-worker related the story surrounding her > initial job interval in the US. She described the stunned look on the > face of the desk clerk at the local Holiday Inn when she asked to be > knocked up at 7:30 the next morning. > This reminds me of the rather surprised

Re: Cross-talk square-wave?

again, I don't know the circuit, but I have personally witnessed this behavior on my PDP-8/e where a 7474 flip flop chip was bad. The input looked great and the output was "half baked" I'll bet that flop was a Fairchild. Dwight From: cctalk

Re: Cross-talk square-wave?

I'll offer a suggestion that if your SD card *must* be a significant distance from its host, that you employ a small MCU at the SD card and use a more noise-immune protocol to transmit data to the host. Small MCUs today are very inexpensive. --Chuck

Re: Cross-talk square-wave?

> From: Allison > FYI this is the same problem designers hit with DRAMS back 40 years ago. This didn't ring (pun not intended) a bell for me; can you say a bit more? > From: Chuck Guzis > I'll offer a suggestion that if your SD card *must* be a significant > distance from

Re: Cross-talk square-wave?

On 3/30/2017 11:22 AM, Chuck Guzis via cctalk wrote: I'll offer a suggestion that if your SD card *must* be a significant distance from its host, that you employ a small MCU at the SD card and use a more noise-immune protocol to transmit data to the host. Small MCUs today are very inexpensive.

Anyone want a Sun T-shirt?

It's what, 27 years old... Trying to de-junk my clothes closet, I ran across an XL t-shirt bearing, on the front, a image of a ladybug with a red circle and bar across is and the legend "Getting out the last bugs". On the back, it has the Sun logo and "SunStruck 4.1.89 (Wanda)". It's in decent

Re: Scrounging - was Floating point routines for the 6809

That time in an open lab at IBM Austin when a newly arrived fellow Brit announced that he had to go out and have a fag. On 30 March 2017 at 13:18, Peter Coghlan via cctalk wrote: > > > > Or the time an English co-worker related the story surrounding her > > initial job

Wyse keyboards and their variants

Wyse, Link, etc. Does anyone still use these on actual terminals? I have some guys coming to scrounge on Saturday, and they want them for is to desolder the switches. If you need some for actual use, please let me know the exact model you want so it does not get parted out. Cindy Croxton

Re: QIX game on PDP-11

On 2017-03-28 19:20, Parent Allison via cctalk wrote: I don't know which PDP-11 that is either. It's a 3rd party card. Anyone recognize it? -ethan Its defiantely J11 powered, the white ceramic chip carrier gives that away. Likely a J11 power Q or Unibus CPU of late vintage. ROI was

Re: Cross-talk square-wave?

IT was not terminated, 270K is way to high a value (likely 1000*). Its low enough to assert a weak pull-up or down to a CMOS input but not terminate a line. Typical transmission line for that is in the 120-250ohm range and the input to a SD/MMC is a roughly 10pf cap to ground and DC open

Re: Anyone want a Sun T-shirt?

If no one who e.g. worked for Sun steps up, I'll take it. mcl

Re: Cross-talk square-wave?

On 03/30/2017 01:21 PM, ben via cctalk wrote: > Well that does not solve the ring, but off loading the SD card is a > good idea, if you have the software time for a new cpu. Most of the > time upper managment drags thier feet, unless they want it > yesterday. Ben. Well, Noel has stated that this

Trip to CHM - Hotel/Restaurant Advice

Hello, all, In mid-June, I am planning a trip to Mountain View for two days to visit the Computer History Museum. I plan on flying out of Portland early AM on June 14, checking into hotel, then heading straight to the museum for the day. I will go back to the hotel for the evening, and return

Re: Cross-talk square-wave?

I didn't look clearly at the trace but it could also be a reflected un-terminated line and not cross talk. Dwight From: cctalk on behalf of Chuck Guzis via cctalk Sent: Thursday, March 30, 2017 1:59:00 PM

Re: Cross-talk square-wave?

On 2017-Mar-30, at 1:13 PM, Noel Chiappa via cctalk wrote: >> From: Allison > >> FYI this is the same problem designers hit with DRAMS back 40 years ago. > > This didn't ring (pun not intended) a bell for me; can you say a bit more? > >> From: Chuck Guzis > >> I'll offer a suggestion that if

Re: Trip to CHM - Hotel/Restaurant Advice

On Mar 30, 2017, at 4:17 PM, Rick Bensene via cctalk wrote: > Hello, all, > > In mid-June, I am planning a trip to Mountain View for two days to visit the > Computer History Museum. > > I plan on flying out of Portland early AM on June 14, checking into hotel, > then heading straight to the

Re: Trip to CHM - Hotel/Restaurant Advice

On 3/30/2017 6:58 PM, CuriousMarc via cctalk wrote: Beware, the Museum is closed Mondays and Tuesdays. Live demos of the IBM 1401 are on Wednesdays 3 pm and Saturdays 11 am. The PDP-1 is demoed more rarely, on some Saturdays in the afternoon. More details here:

Re: Trip to CHM - Hotel/Restaurant Advice

On 03/30/2017 08:56 PM, Bob Rosenbloom via cctalk wrote: > Corporate Systems Center, and Martin, still exist, as Digital > Loggers, on Walsh Av. I still work there, 20+ years... I still have the manuals and software for his Fastcache and Fastecache 32 SCSI controllers. Got rid of the cards

Re: Trip to CHM - Hotel/Restaurant Advice

On Thu, 30 Mar 2017, jim stephens via cctalk wrote: Across from the side of the road that original Frys was on was a TOGO's that filled the parking lot and 2 or three nicely stocked junk stores, which changed frequently. The guys who did the Hard Disk drive guide book had their original store

Re: Trip to CHM - Hotel/Restaurant Advice

On Thu, 30 Mar 2017, Chuck Guzis via cctalk wrote: I recall when John Fry opened his store, the big seller was Canfield's Diet Chocolate Fudge Soda. I thought it was dreadful, but people bought it by the caselot. Fry's had a lot of Everex PC boards, much of which was probably returns. And

Re: Cross-talk square-wave?

On 03/30/2017 09:07 PM, Tony Duell via cctalk wrote: > The fundamental rule is 'You can't change the voltage across a > capacitor instantly'. There is a related one 'You can't change the > current through an inductor instantly'. It (of course) doesn't matter > if said capacitor or inductor is an

Re: Cross-talk square-wave?

> It's not clear C-coupling is what's going on here (the wave shape looks > pretty sharp for what I understand of the circuit/layout). > Notably though, C-coupling would remove any DC bias, but David's screen shot > indicates a DC bias on the line. > > Is this line currently connected to the

Re: Trip to CHM - Hotel/Restaurant Advice

On 3/30/17 8:15 PM, Chuck Guzis via cctalk wrote: > On 03/30/2017 08:04 PM, jim stephens via cctalk wrote: >> As to recommendations, I like the Country Inn & Suites by Carlson in >> Sunnyvale, which is at Ca 237 and Caribbean. If you run around by >> the bay is Weird Stuff, and it is about 2

Re: Cross-talk square-wave?

On Thu, Mar 30, 2017 at 9:13 PM, Noel Chiappa via cctalk wrote: > I'm still not clear, from the discussion, how exactly that nice 'square-wave' > interference is happening - could it be capacitative crosstalk? (I'd have > thought capacitative cross-talk would be inverted -

RE: Trip to CHM - Hotel/Restaurant Advice

From: Rick Bensene Sent: Thursday, March 30, 2017 2:18 PM > What I'm asking for is help/recommendations in terms of a good hotel to > stay at that is relatively close to the museum. I don't want to be in a > luxury hotel, nor do I want to be in a dive. I'd also like to be in a > place that has

Re: Cross-talk square-wave?

On 03/30/2017 06:01 PM, Brent Hilpert via cctalk wrote: > On 2017-Mar-30, at 1:13 PM, Noel Chiappa via cctalk wrote: >>> From: Allison >>> FYI this is the same problem designers hit with DRAMS back 40 years ago. >> This didn't ring (pun not intended) a bell for me; can you say a bit more? >>

Re: Trip to CHM - Hotel/Restaurant Advice

I have that book! George Rachor > On Mar 30, 2017, at 8:56 PM, Bob Rosenbloom via cctalk > wrote: > > On 3/30/2017 8:42 PM, Fred Cisin via cctalk wrote: >> On Thu, 30 Mar 2017, jim stephens via cctalk wrote: >>> Across from the side of the road that original Frys was on

Re: Trip to CHM - Hotel/Restaurant Advice

You want the Hampton Inn. https://www.google.com/maps/place/Hampton+Inn+%26+Suites+Mountain+View/@37.3950988,-122.0791475,15.53z/data=!4m8!1m2!2m1!1shotels+near+Mountain+View,+CA!3m4!1s0x0:0xc7d978e934c5a2ca!8m2!3d37.3988499!4d-122.0754889 It is walking distance to the light rail station and

Re: Trip to CHM - Hotel/Restaurant Advice

On 03/30/2017 08:04 PM, jim stephens via cctalk wrote: > As to recommendations, I like the Country Inn & Suites by Carlson in > Sunnyvale, which is at Ca 237 and Caribbean. If you run around by > the bay is Weird Stuff, and it is about 2 or so miles from the CHM. > At 237 Caribbean becomes

Re: Trip to CHM - Hotel/Restaurant Advice

On 3/30/2017 8:15 PM, Chuck Guzis via cctalk wrote: Bonus points for those who remember their original original location. --Chuck General area of lots of good junking back in the day was here. I think Halted is the last one of the originals to leave. They moved to a place on Ryder and

Re: Cross-talk square-wave?

On 03/30/2017 10:07 PM, David Bridgham via cctalk wrote: It's not clear C-coupling is what's going on here (the wave shape looks pretty sharp for what I understand of the circuit/layout). Notably though, C-coupling would remove any DC bias, but David's screen shot indicates a DC bias on the

Re: Trip to CHM - Hotel/Restaurant Advice

On 03/30/2017 08:31 PM, Al Kossow via cctalk wrote: > Phelen Ave in San Jose, which was before the larger place on Sycamore > in Milpitas. In the late 70s, on Evelyn in Sunnyvale, near Wolfe, I believe. I could check my old records. I recall when John Fry opened his store, the big seller was

Re: Trip to CHM - Hotel/Restaurant Advice

On 3/30/2017 8:15 PM, Chuck Guzis via cctalk wrote: Bonus points for those who remember their original original location. --Chuck Halted? We drove by there, could get address off google. Weird Stuff used to be across from the original Frys, then Frys move across the street with the Giant

Re: Trip to CHM - Hotel/Restaurant Advice

On 3/30/17 8:35 PM, Fred Cisin via cctalk wrote: >The guys who did the Hard Disk drive guide book had their >> original store in there Corporate Systems Center their main office was on Maude

Re: Trip to CHM - Hotel/Restaurant Advice

On 3/30/2017 8:42 PM, Fred Cisin via cctalk wrote: On Thu, 30 Mar 2017, jim stephens via cctalk wrote: Across from the side of the road that original Frys was on was a TOGO's that filled the parking lot and 2 or three nicely stocked junk stores, which changed frequently. The guys who did the

Re: Trip to CHM - Hotel/Restaurant Advice

I'd look at hotels on El Camino in Mountain View or Palo Alto, maybe near San Antonio road. There are a whole bunch of smaller hotels along there. Warning: this is California, Silicon Valley and more specifically Google land, so hotels tend to be full and rather expensive for what they are, as