Re: Diskette size (was: Repurposed Art (ahem...)

Eric said: > I think Shugart settled on 5.25" for the size of a minifloppy at least a > year, and more likely two years, before Steve Jobs would have visited. I > don't have proof, but SA400 public intro was in 1976, and they probably > took more than a year of development to get to that point.

Re: Diskette size (was: Repurposed Art (ahem...)

Extremely interesting Fred. I hadn't heard of half of those experimental disk sizes.  Are those stories from your experience or from that article? (Yes I'll rtfm shortly). The only odd one i have is a backup cartridge? that resembles around a 3.5" but is in fact closer to the mythical 12"

Re: Diskette size (was: Repurposed Art (ahem...)

On Jul 19, 2017 10:15 AM, "Fred Cisin via cctalk" wrote: > That Steve Jobs was pestering them for a cheap drive, but due to the holes in his jeans and personal hygiene?, they never took him seriously. I think Shugart settled on 5.25" for the size of a minifloppy at least a

Re: PDP11 and Simh Floating point

On Jul 19, 2017 10:43 AM, "Douglas Taylor via cctalk" wrote: The pdp11_fp.c code is quite intricate. If simh was a simple simulation it would take the easy route and use the intel fp co-processor as you point out, but it doesn't. It actually 'emulates' what the pdp11

RE: Removing Pitting and Rust From an Enclosure

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Chuck Guzis > via cctalk > Sent: 20 July 2017 14:43 > To: Brent Hilpert via cctalk > Subject: Re: Removing Pitting and Rust From an Enclosure > > On 07/20/2017 12:02 AM, Brent

RE: Removing Pitting and Rust From an Enclosure

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Paul Koning > via cctalk > Sent: 20 July 2017 15:18 > To: Brent Hilpert ; General Discussion: On-Topic and Off- > Topic Posts > Subject: Re: Removing Pitting

Re: iMac ethernet connection quit - help?

> From: Mark Tapley > Next stop, I'll pull the cover off the machine and see whether I can > spot any spilled battery electrolyte from the old battery or anything > else suspicious looking on the logic board in that area It probably wouldn't hurt to clean that area with a Q-tip

Re: early (pre-1971) edge-triggered D flip-flop ICs

In 1978 the place I worked the cost per SSI/MSI TTL 38510 device was between $100 and $200 each by the time they were released to production. the key is the 38510 and the testing. In final use, the parts had power applied for no more then an hour. -pete On Thu, Jul 20, 2017 at 1:35 AM, Eric

Re: early (pre-1971) edge-triggered D flip-flop ICs

Or, in today's dollars - $58. Ouch. From: "General Discussion" To: "cctalk" Sent: Thursday, July 20, 2017 1:35:47 AM Subject: Re: early (pre-1971) edge-triggered D flip-flop ICs On Wed, Jul 19, 2017 at 11:29 PM, Ethan Dicks

Re: Removing Pitting and Rust From an Enclosure

On Wed, Jul 19, 2017 at 1:52 PM, Rob Jarratt via cctalk < cctalk@classiccmp.org> wrote: > The TURBOchannel extender I got has a bit of rust and quite a lot of dark > pitting on the steel surfaces. I am not sure what the finish is, whether it > is anodized or galvanized. In any case, does anyone

Re: Removing Pitting and Rust From an Enclosure

> On Jul 20, 2017, at 3:02 AM, Brent Hilpert via cctalk > wrote: > >> ... > > The yellowish plating is probably chromate conversion: > https://en.wikipedia.org/wiki/Chromate_conversion_coating That sounds familiar from vague DEC memories. As for those galvanized

Re: Diehl Combitron

> On Jul 19, 2017, at 8:01 PM, Brent Hilpert via cctalk > wrote: > ... > Very nice, in addition I much appreciate the use of the period-appropriate > oscilloscope. > > I've been offered a Tek 500 series recently, I'm reluctant to take it on as > they are in practice

Re: Removing Pitting and Rust From an Enclosure

On 07/20/2017 12:02 AM, Brent Hilpert via cctalk wrote: > A copper layer can perform some filling and smoothing function in a plating > job. > Its perhaps more significant purpose however (as I understand it in my > limited experience with having plating done*), is to provide an oxygen >

Re: HP 300-series boot rom archive?

On Jul 19, 2017, at 10:21 PM, Josh Dersch via cctech wrote: > On 7/18/2017 10:29 PM, r.stricklin via cctalk wrote: > >> I don't have a 375, but I'll be glad to provide what I can. Having a sense >> of what, specifically, was being sought (and where to send it) would help me >> focus effort. >

Re: early (pre-1971) edge-triggered D flip-flop ICs

On Wed, Jul 19, 2017 at 11:29 PM, Ethan Dicks wrote: > I have no datasheet, but I have examples on DEC M-series FLIP-CHIP > modules from my PDP-8/L, c. 1968. > > I am pretty sure I have examples with 1968 date codes and possibly > 1967 date codes. > Thanks! Also, the 1967

Re: Removing Pitting and Rust From an Enclosure

It depends on what the object in question is for (decoration or durability) and what time period it was done. Way back in the early 90's when I worked at a plating facility for the printing industry (Tide soap boxes, Marlboro cigarette boxes as an example) they used to copper plate large and

Re: Repurposed Art (ahem...)

I like it, that's quite artfully done actually! Best paint job ever on an 024 (am I right? 024, not 026 because it has no printer?). It would be perfect if you had a normal 024 or 026 to put right beside it with its drab gray wrinkle paint. What a pity it lost its keyboard. That ruined both the

Re: Removing Pitting and Rust From an Enclosure

On 2017-Jul-19, at 11:37 PM, Rob Jarratt via cctalk wrote: >> -Original Message- >> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Chuck Guzis >> via cctalk >> Sent: 20 July 2017 03:34 >> To: Fred Cisin via cctalk >> Subject: Re: Removing Pitting

Re: HP 300-series boot rom archive?

On 7/18/2017 10:29 PM, r.stricklin via cctalk wrote: On Jul 18, 2017, at 8:38 AM, Al Kossow via cctech wrote: When MAME started supporting the 68K 9000s, I made an effort to go through all of my machines and dump the firmware. I didn't have a 375, which is why it isn't there. It would be

RE: Removing Pitting and Rust From an Enclosure

> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Chuck Guzis > via cctalk > Sent: 20 July 2017 03:34 > To: Fred Cisin via cctalk > Subject: Re: Removing Pitting and Rust From an Enclosure > > On 07/19/2017 07:13 PM, Fred

RE: Anyone Know Anything About This TURBOchannel Card?

> -Original Message- > From: John Forecast [mailto:j...@forecast.name] > Sent: 18 July 2017 16:27 > To: r...@jarratt.me.uk; Rob Jarratt ; General > Discussion: On-Topic and Off-Topic Posts > Subject: Re: Anyone Know Anything About This