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scotws
PostPosted: Sun Apr 12, 2015 10:51 am 
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... as I learned yesterday when I wore my EA 80 FD t-shirt to work (on Saturday, nobody cares) and a colleague asked me where I had heard of the band. Uh, what? There is not much on the net about them (http://de.wikipedia.org/wiki/EA80).
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Dr Jefyll
PostPosted: Sun Apr 12, 2015 5:44 pm 
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scotws wrote:
I wore my EA 80 FD t-shirt to work
EA 80 FD ? That sounds like a shirt to wear on a holiday, not at work. (Or did you go to work on Saturday to get a holiday from building planter boxes?) :)

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BigDumbDinosaur
PostPosted: Sun Apr 12, 2015 5:47 pm 
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scotws wrote:
... as I learned yesterday when I wore my EA 80 FD t-shirt to work (on Saturday, nobody cares) and a colleague asked me where I had heard of the band. Uh, what? There is not much on the net about them (http://de.wikipedia.org/wiki/EA80).

    EA80 is a German punk rock band from Mönchengladbach, Germany. The group started in 1979 as "Panzerfaust" and changed the name to EA80 in the year 1980.

Does this band just stand there and makes loops around the stage? :lol: What is the significance in German of EA80?

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scotws
PostPosted: Mon Apr 13, 2015 9:30 am 
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I have no idea what that means, and so far the Internet hasn't been able to tell me. I'm slightly worried that they might be right-wing or something that will get me into trouble, but then they would have been in the media far more ... I'll do some more research. Might have to include another NOP next t-shirt to avoid this sort of thing. Though I'd probably have to start with bench presses to have enough room on the front ...
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barrym95838
PostPosted: Mon Apr 13, 2015 3:11 pm 
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... or just go with B8 50 FE ... not as instantly recognizable, but software-compatible all the way back to NMOS.

Mike B.
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BigEd
PostPosted: Mon Apr 13, 2015 3:16 pm 
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An endless loop with a purpose!
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barrym95838
PostPosted: Mon Apr 13, 2015 8:29 pm 
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BigEd wrote:
An endless loop with a purpose!

... and able to exit with a reset, IRQ, NMI or a twiddle of pin 38!

Mike B.

[Apparently, Twiddle is the name of a band too!]
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BigEd
PostPosted: Mon Apr 13, 2015 8:50 pm 
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(Pin 38 being labelled C.P.S. for Chuck Peddle Special!) Bruce writes:
Quote:
Former Commodore engineer Bil Herd shared this story about the SO pin that can be used to set the V flag:

Quote:
One day in '83 or '84 I asked a question about the 6502 and Benny Pruden said "come with me". We went to the CAD area and ask Michael Angelina (head of CALMA/CAD) and his reply was, "yeah we got that here somewhere". I had no idea that he meant the hand drawn schematic of the 6502, until they opened the drawer! (I swear it was written on parchment) We looked at it for a bit when Benny started laughing and tapped the pin that had CPS in pencil over it, that later became the SO pin. CPS he explained, meant the Chuck Peddle Special pin.

Benny was the only guy that ever used it that I knew, he did the tightest loop possible in a piece of disk drive code.

See also http://visual6502.org/wiki/index.php?ti ... #Pin_Names
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BigDumbDinosaur
PostPosted: Tue Apr 14, 2015 5:16 am 
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BigEd wrote:
(Pin 38 being labelled C.P.S. for Chuck Peddle Special!) Bruce writes:
Quote:
Former Commodore engineer Bil Herd shared this story about the SO pin that can be used to set the V flag:

Quote:
One day in '83 or '84 I asked a question about the 6502 and Benny Pruden said "come with me". We went to the CAD area and ask Michael Angelina (head of CALMA/CAD) and his reply was, "yeah we got that here somewhere". I had no idea that he meant the hand drawn schematic of the 6502, until they opened the drawer! (I swear it was written on parchment) We looked at it for a bit when Benny started laughing and tapped the pin that had CPS in pencil over it, that later became the SO pin. CPS he explained, meant the Chuck Peddle Special pin.

Benny was the only guy that ever used it that I knew, he did the tightest loop possible in a piece of disk drive code.

See also http://visual6502.org/wiki/index.php?ti ... #Pin_Names

Note that in the WDC 65C02 data sheet, that pin is designated SOB. :D How many here think that is "cry"?

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barrym95838
PostPosted: Tue Apr 21, 2015 1:45 am 
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I just found this at the bottom of this page:
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For the "branch taken, same page" case there is an oddity with interrupts. In this case, T1F is preceded by T3 (not T0 or T2), so no interrupt can happen on the next instruction! You can mask NMIs this way even (but not reset, it messes up the timing directly).


Would it be true then that a non-page-crossing one-instruction loop cannot be interrupted with an IRQ or even an NMI?

Mike B.
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Dr Jefyll
PostPosted: Tue Apr 21, 2015 2:03 am 
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barrym95838 wrote:
Would it be true then that a non-page-crossing one-instruction loop cannot be interrupted with an IRQ or even an NMI?
There's more on the subject here, Mike :)

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