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Computing nostalgia

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Computing nostalgia

Prompted by this post http://community.plus.net/forum/index.php/topic,74056.msg590655.html#msg590655
I'm old enough to remember but was a programmer, not an operator - and our's were ICL System 4/70 and a 4/72 which used the same machine instructions. Hence the prized possession which lurks at the back of my desk drawers.
How many people here could explain (without looking it up) what a BXLE does and how to use it?
jelv (a.k.a Spoon Whittler)
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5 REPLIES
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Re: Computing nostalgia

I've looked it up and I'm still not clear Embarrassed

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MrC
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Re: Computing nostalgia

Sheer and utter guestimate - Branch and Xor if LEss than?
Mike (did a small amount of 360 assembler back in the mid-80s)
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Re: Computing nostalgia

Oh it's a conditional instruction Undecided

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Re: Computing nostalgia

Quote from: MrC
Sheer and utter guestimate - Branch and Xor if LEss than?

Close! Branch on Index Low or Equal.
Horribly complicated to use (but very efficient) and generally only used by clever dicks who were trying to show off or by most programmers just once to be able to say they'd used it. If you were a maintenance programmer and came across it you would groan!
jelv (a.k.a Spoon Whittler)
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MrC
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Re: Computing nostalgia

Smiley I only did a very small amount of IBM assembler; most of my commercial programming was COBOL74/85 on Tandem before I moved over onto Tandem application and system support, and then onto Unix and then network applications and security.
Now I drive trains for a living and it all seems a world awaySmiley
Mike