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3 hours ago, wierd_w said:

The Halt and Catch Fire instruction was for the 6502, right?  One of the "Undocumented Opcodes"?

https://x86.fr/investigating-the-halt-and-catch-fire-instruction-on-motorola-6800/

 

I hate when old stuff works its way into the popular lexicon because it makes it damn near impossible to search for the old stuff.  In this case, I had to search with the qualifiers "-tv -show -series".

 

I also remember an error code about a printer jam and it asks something like "is it on fire?"  I recall this was something about a particular printer's wont for jamming paper under a hot head.  Maybe that is one of those urban legends.

 

Wikipedia is unclear, as expected.

 

https://en.wikipedia.org/wiki/Lp0_on_fire

 

This fun article:

 

https://arstechnica.com/information-technology/2011/11/hp-printers-can-be-remotely-controlled-and-set-on-fire-researchers-claim/

 

And this for the 3D printing types:

 

https://www.thissmarthouse.net/dont-burn-your-house-down-3d-printing-a-cautionary-tale/

 

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20 hours ago, Omega-TI said:

I also found it on Netflix.

 

Prime.thumb.PNG.4932e282fac57f738a43ec45f5206864.PNG

It's not here at my Netflix in Denmark. But thankfully I've seen it previously (on something called YouSee). Very nice.

There's another series called High Score (on Netflix here at my end). It's an absolutely must see !!! 

image.png.f2e1b075654e7052f22397bfededda93.png
 

Edited by sometimes99er

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1 hour ago, sometimes99er said:

It's not here at my Netflix in Denmark. But thankfully I've seen it previously (on something called YouSee).

 

I've had the same issue with a series or two on Netflix in the past, but a quick country change of origin with my NordVPN cured it like magic.  😁

VPN.thumb.PNG.98f170469209f5f57d33b96159fe3e70.PNG

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1 hour ago, sometimes99er said:

There's another series called High Score (on Netflix here at my end). It's an absolutely must see !!! 

I've not had the time to watch it all yet, but what I've seen so far is good.

 

409091520_HighScore.PNG.884a355abd3bb65cfdc55051f1dc0fd0.PNG

 

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3 hours ago, OLD CS1 said:

https://x86.fr/investigating-the-halt-and-catch-fire-instruction-on-motorola-6800/

 

I hate when old stuff works its way into the popular lexicon because it makes it damn near impossible to search for the old stuff.  In this case, I had to search with the qualifiers "-tv -show -series".

 

I also remember an error code about a printer jam and it asks something like "is it on fire?"  I recall this was something about a particular printer's wont for jamming paper under a hot head.  Maybe that is one of those urban legends.

 

Wikipedia is unclear, as expected.

 

https://en.wikipedia.org/wiki/Lp0_on_fire

 

This fun article:

 

https://arstechnica.com/information-technology/2011/11/hp-printers-can-be-remotely-controlled-and-set-on-fire-researchers-claim/

 

And this for the 3D printing types:

 

https://www.thissmarthouse.net/dont-burn-your-house-down-3d-printing-a-cautionary-tale/

 

Looks like we are actually BOTH correct..

 

https://en.wikipedia.org/wiki/Halt_and_Catch_Fire_(computing)#Other_CPUs

 

MOS 6502 has several invalid opcodes that will freeze the CPU. While none of them will trap the CPU in a testing loop that disregards certain safety issues (and thus cause the chip to burn up) like with the 68000, they are illegal opcodes that jam everything up hard when the CPU is instructed to decode them, and it is non-recoverable (without a power off).

 

But hey, at least I knew it was a reference to a CPU instruction. :P

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I wonder what criteria they used for this list. Is it how advanced/affordable they were when they were released? Also I love how they put a picture of a Model 100 on the TRS-80 bit!

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kinda sorta.  It would probably take a long time to burn up.

 

IIRC, the M68000 lacked a heat sink, or fan. If it was running balls-to-the-walls in a cycle counter, with no heat dumping, in a cramped pizza box (like a period mac, such as a IIci or a Macintosh(lc)...) it is conceivable that it would eventually overheat enough to damage it.


 

Quote

 

The process is reviewed by David Agans, thus:

In the old days of the Motorola 6800 microprocessor, instruction code DD caused the processor to go into an endless loop, reading from each memory address in order. (Other engineers referred to this as the "Halt and Catch Fire" [HCF] instruction, but we remembered the code by calling it the "Drop Dead" instruction.) Drop Dead mode was wonderful for spotting hardware timing and address logic problems with a scope; all of the address and clock lines were nice, cycling square waves.[15]

That is, either opcode made the processor enter a mode, continuously performing memory read cycles from successive addresses with no intervening instruction fetches. Hence, the address bus effectively became a counter, allowing the operation of all address lines to be quickly verified. Once the processor entered this mode, it was not responsive to interrupts, so normal operation could only be restored by a reset (hence the "Drop Dead" and "Halt and Catch Fire" monikers). These references were thus to the unresponsive behavior of the CPU in this state, and not to any form of erratic behavior.[citation needed]

The mnemonic HCF is believed to be the first built-in self-test feature on a Motorola microprocessor.[2]

 

 

Edited by wierd_w
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As of the 28th I'll no longer have Netflix (cancelled it), so I'm stopping at the end of first season story arc of Halt & Catch fire.  So, in my remaining time, are there any other single or very short computer related series I could hoover the next five days?

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3 hours ago, wierd_w said:

kinda sorta.  It would probably take a long time to burn up.

 

IIRC, the M68000 lacked a heat sink, or fan. If it was running balls-to-the-walls in a cycle counter, with no heat dumping, in a cramped pizza box (like a period mac, such as a IIci or a Macintosh(lc)...) it is conceivable that it would eventually overheat enough to damage it.

The 6800 is a different processor than the 68000. It's the 68 hundred that has the issue. :)

 

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Ahh. Thanks.

 

@Omega-TI

 

There are some lovely documentaries on Netflix about the rise of computing and nerd cultures in Silicon Valley that are worth a watch. Give me a minute.

 

Here's one-- Part one of a 3 part. I watched it on netflix, but also apparently on youtube.

 

 

 

Edited by wierd_w
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We caught a few episodes of H&CF first run. Interpersonal Drama topped the nerd aspect, had the required gay type, etc. Meh. Lost interest.

 

Top 20 ever? The story seemed based on what game development was spurred by the platform, which follows market success moreso than any tech advantage. I never owned more than a couple to have any fave over the TI99, which of course rules hands down! :-D

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2 minutes ago, OLD CS1 said:

@Ed in SoDak I have absolutely no interest in dramatizations and artistic story-telling of history during which I was alive.

 

The Triumph of the Nerds series (on You Tube) that @wierd_w mentioned was really good (IMHO) and kept me watching.  

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