Exceeding Vgs rating

"Tim Williams" <tiwill@seventransistorlabs.com> writes:

> "Clifford Heath" <no.spam@please.net> wrote in message
> news:2gRAC.26085$8Y2.22515@fx28.iad...
>> I once accidentally ran a 5V quartz-windowed MC68HC11
>> on 9V, and it worked... except for the ADC that was
>> damaged. Back on 5V, the current consumption was
>> slightly raised, but everything else still worked ok.
>> The ADC was still dead.
>
> Heh, surprised it didn't glow yellow-green.  Or maybe it did, but it
> was too dim to see.

Ah happy days, the purple flash from a windowed 8749 when you blew it
up...

-- 

John Devereux

On 16/04/18 19:28, jrwalliker@gmail.com wrote:
> On Monday, 16 April 2018 00:30:11 UTC+1, Clifford Heath  wrote:
>> I once accidentally ran a 5V quartz-windowed MC68HC11
> That was a nice processor - along with the Hitachi clones like the 63701.

Indeed. If it had flash and hardware breakpoint support
I could have been much more ambitious with it. As it
was, being mainly a software guy, I'd get the hardware
working, make a start on the software, and get bored
with the erase-program-test cycle before finishing
projects.

I built a remote debugger that fit in 256 bytes, and a
user in France debugged his RTOS that controlled a hobby
rocket to 25,000 feet. He now works with ESA, last I heard.

On Monday, 16 April 2018 11:48:10 UTC+1, Clifford Heath  wrote:
...
> was, being mainly a software guy, I'd get the hardware
> working, make a start on the software, and get bored
> with the erase-program-test cycle before finishing
> projects.

I had an eprom emulator that plugged into the "piggy back"
eprom socket of a 63P01 which greatly speeded up that process.

As the one-time-programmable devices were much cheaper than the
windowed ones I tried X-ray erasure (at 30keV).  Unfortunately,
although this worked, the storage cells became permanently
leaky.

John

>Ah happy days, the purple flash from a windowed 8749 when you blew it 
up...

Heart-warming, to be sure. Of course anyone nostalgic for the days of burn-and-crash development(*) can always use Arduino. ;)

Cheers

Phil Hobbs

(*) for any youngsters lurking, the pun refers to burning (programming) an EPROM and then watching your program crash, fixing the bug, and iterating till it stopped crashing. 

On Mon, 16 Apr 2018 20:47:55 +1000, Clifford Heath
<no.spam@please.net> wrote:


>I built a remote debugger that fit in 256 bytes, and a
>user in France debugged his RTOS that controlled a hobby
>rocket to 25,000 feet. He now works with ESA, last I heard.
Who would need a debugger with assembler, those days programs worked
at the first time