design help

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RTFM
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Reply to
John Fields
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On Thu, 26 Feb 2009 06:33:21 +0000, James Arthur wrote: ...

^^^^^^^^^^

IRQ-to-IRQ. There is no "irq". ;-)

Cheers! Rich

Reply to
Rich Grise

7 pins?

Thanks, Rich

Reply to
Rich Grise

So, how are those FORTRAN FPGAs working out for you? ;-)

Cheers! Rich

Reply to
Rich Grise

I think John Larkin was simplifying John Field's function, not responding to the OP.

I posted a couple circuits. Here's the fewest parts I can manage:

+12v -+- | .-----------------------+ | | [R1] | | D1 | |> / +---|>|------. [relay] | / | | | O O | | | +-----[R2]---+-----. |--' | | | |
Reply to
James Arthur

You need more address bits that way, which means that LARGE amount program memory space (= money) is wasted because of a few instructions that cross page boundaries. Multiply that times large quantities and you'd be p*ssing away huge amounts of cash. Not everyone can afford to be so wasteful, you know.

Reply to
Spehro Pefhany

Luxury. When I were a part-time late-night Telex operator we had to use paper tape and send at something like 110 baud. And we liked it.

Reply to
Spehro Pefhany

Let it die John, Vlad is that worst-of-all-possible combinations, a Russian hydramatic okie ;-)

...Jim Thompson

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| James E.Thompson, P.E.                           |    mens     |
| Analog Innovations, Inc.                         |     et      |
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Reply to
Jim Thompson

Wasn't it fun toggling in your bootstrap loader from the front panel switches? (....and we LIKED it that way!!!!!)

Reply to
Lord Garth

Paper tape? Luxury. Ahh, when I were a lad how how we dreamed of 'avin' paper tape. Why, we 'ad to put our bits in buckets an' carry 'em up from a dank, dark dungeon, two flights of stairs each, one by one. We strapped 'em onto donkeys an' sent 'em cross-country by mule train.

Aye, those were the days.

James Arthur

Reply to
James Arthur

Feh! You 'ad it soft. When I were young, first thing we 'ad to do was assemble the computer on the patch panel. And none of your sissy digital stuff neither! Analog it were! Programmed it wire by wire, one differential equation at a time! Oh, and the wires were kept in a locked cupboard, two floors away, and uphill both ways!

Reply to
Greg Neill

In article , To-Email- snipped-for-privacy@My-Web-Site.com says...>

And you were really from UUest Uirginia.

Reply to
krw

Yup! UUest by Gawwwwd ;-)

...Jim Thompson

--
| James E.Thompson, P.E.                           |    mens     |
| Analog Innovations, Inc.                         |     et      |
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Reply to
Jim Thompson

On a quick read, the original polarity descriptions were a bit confusing. To flip the polarity takes a couple more parts.

|>>> | | | |

John

Reply to
John Larkin

The original description wasn't a model of clarity.

But if you keep score and rejoice in mistakes, enjoy.

John

Reply to
John Larkin

Yet another hazard of lowercase. Entire hardware subsystems disappear.

John

Reply to
John Larkin

Translating the original I paused at that line and pondered nearly a full second, flipping it back and forth. It could go either way.

IRQ_EN, IRQ1, or IRQ_HANDLER would certainly get capitals, being actual hardware or software elements.

'irq' used as an abbreviation? Didn't seem important enough. Could be, though, I confess.

Ain't my code, so I'm not the judge and jury. And I'm not that fussy--I just use UPPERCASING as an aid to readability and understanding, it's not a law.

Cheers, James Arthur

Reply to
James Arthur

I wouldn't. To aid readability they'd be IRQ_En, IRQ1, IRQ_Handler, or even InterruptHandler on my schematics, VHDL, and embedded code. The PITA I'm fighting now is '+' and '-'.

I use BiCapitalization to separate words and *generally* the underscore to offset a base function or hierarchical block, though I also use the underscore to separate abbreviations.

Reply to
krw

There are many variations of this delay circuit. For someone testing this R1=10k R2=100k C=100 uF Should give around 10 second delay. Increase R2 for longer times. Also, I'd add a 10 volt zener to the Gate of the MOSFET. This makes the timing easier to modify and allows adapting the circuit for higher supply voltages by protecting the gate.

Reply to
bw

Keep working on your 555 thing. If you add enough parts, you may eventually get it right.

John

Reply to
John Larkin

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