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JackAsser
Registered: Jun 2002
Posts: 2014 |
NMI delay
How much is an NMI delayed if triggered during IRQ-setup? |
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... 45 posts hidden. Click here to view all posts....
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Martin Piper
Registered: Nov 2007
Posts: 699 |
Quote: Martin, if you have nothing to add to this conversation, then kindly shut up. No one wants to argue with you about tangential subjects just so you can die on yet another hill about something you clearly misunderstand.
Good lord man...
It's directly relevant since it details exactly how the instructions work.
Paz is just wrong and trying to go into tangents instead of sticking to the topic. |
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chatGPZ
Registered: Dec 2001
Posts: 11293 |
It has been an irrelevant topic since post #28, so yes.
Everyone here knows already how illegal opcodes work and that incomplete decoding is involved. Really. If you want to call it PLA doesn't matter a single bit to the topic. |
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Martin Piper
Registered: Nov 2007
Posts: 699 |
Quote: It has been an irrelevant topic since post #28, so yes.
Everyone here knows already how illegal opcodes work and that incomplete decoding is involved. Really. If you want to call it PLA doesn't matter a single bit to the topic.
It's not me calling it a PLA, it's all the technical sources demonstrating it's a PLA by the analysis of the gates on the chip. Meanwhile we have your lack of knowledge baseless claims.
The fact is "paz" you're just wrong on this topic as you are wrong on so many other topics.
It's relevant to the topic because it directly deals with how the instructions are decoded. It's why studying at things like visual 6502 are important. |
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Martin Piper
Registered: Nov 2007
Posts: 699 |
Quote: Martin, if you have nothing to add to this conversation, then kindly shut up. No one wants to argue with you about tangential subjects just so you can die on yet another hill about something you clearly misunderstand.
Good lord man...
oh and "No one wants to argue with you" if that were true then "paz" wouldn't be trying to reply to my posts right? But here we he, "paz" is spewing rubbish again and again. If you have a problem with irrelevant posts then talk to "paz". |
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chatGPZ
Registered: Dec 2001
Posts: 11293 |
Incomplete logic is not what defines a PLA. Removing "don't care" gates and logic from digital circuits is basically done everywhere, always (And the guys at MOS were really good at this, no doubt).
If you really want to pull the ancient TI terminology - even that doesn't apply. This refers to a standard component that can be customized by the customer. This is not the case for the 6502 either. The "custom chip" on the later AR5 hardware would be one for which this is the correct term, for example (iirc they coined yet another, different, term for this particular IC, because marketing reasons. Forgot what it was).
But what do i know. You are the expert.
(And yes, as soon as someone has to resort to calling names, you can be sure you have to take him serious. for real) |
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Martin Piper
Registered: Nov 2007
Posts: 699 |
Quote: Incomplete logic is not what defines a PLA. Removing "don't care" gates and logic from digital circuits is basically done everywhere, always (And the guys at MOS were really good at this, no doubt).
If you really want to pull the ancient TI terminology - even that doesn't apply. This refers to a standard component that can be customized by the customer. This is not the case for the 6502 either. The "custom chip" on the later AR5 hardware would be one for which this is the correct term, for example (iirc they coined yet another, different, term for this particular IC, because marketing reasons. Forgot what it was).
But what do i know. You are the expert.
(And yes, as soon as someone has to resort to calling names, you can be sure you have to take him serious. for real)
Again incorrect.
https://en.wikipedia.org/wiki/Programmable_logic_array
"A programmable logic array (PLA) is a kind of programmable logic device used to implement combinational logic circuits. "
It does not have to be programmable or customisable by the customer either. A mask programmed part is still a PLA, just like the one in the 6502.
Your incorrect statements are not supported by anything. |
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chatGPZ
Registered: Dec 2001
Posts: 11293 |
You are so right Martin. Thanks. |
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ChristopherJam
Registered: Aug 2004
Posts: 1403 |
Martin, the very page you keep linking to opens by saying that "A programmable logic array (PLA) is a kind of programmable logic device," with the last three words linking to a page that states in the first paragraph that "the function of a PLD is undefined at the time of manufacture."
The incomplete address decoding is entirely tangential to post manufacture programmability. You're correct in saying that it's not a ROM, but you're wrong about saying it's programmable. |
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Martin Piper
Registered: Nov 2007
Posts: 699 |
Quote: Martin, the very page you keep linking to opens by saying that "A programmable logic array (PLA) is a kind of programmable logic device," with the last three words linking to a page that states in the first paragraph that "the function of a PLD is undefined at the time of manufacture."
The incomplete address decoding is entirely tangential to post manufacture programmability. You're correct in saying that it's not a ROM, but you're wrong about saying it's programmable.
And can be mask programmable... "MOS Technology / Commodore Semiconductor Group began producing a **mask-programmed PLA**"
That's the important bit along with how the actual gates are on the chip. The gates for that part of the 6502 are very clearly documented in multiple sources as a PLA. "the original **6502 chip contained a PLA** to direct various operations of the processor" |
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Martin Piper
Registered: Nov 2007
Posts: 699 |
"MOS 906114-01. This was a **mask programmable** NMOS clone of the 82S100."
"PLA pinout
The PLAs used in the C64 ... not connected internally **for mask programmable parts**."
https://skoe.de/docs/c64-dissected/pla/c64_pla_dissected_a4ds.p.. |
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