6510 vs 8500 - support for illegal opcodes ?
6510 vs 8500 - support for illegal opcodes ?
It seems to be a well known fact that the 6510 supports the illegal op-codes of the MOS 6502, apparently a consequence of both having been made using NMOS process. It's also known that CMOS versions of the 6502, such as the popular Rockwell R65C02 do not support these op-codes.
But what about the 8500 which is a 6510 drop-in replacement made by MOS/CSG beginning in 1986 ? Does it support illegal 6502 op-codes too?
This CPU is 100% pin compatible with the 6510 and is used in many boards 250466 and the 64c's 250469. It was made using HMOS process technology which makes it consume a lot less power and produce virtually no heat. Does the change in manufacturing process have the same consequence as with the CMOS 6502 ?
But what about the 8500 which is a 6510 drop-in replacement made by MOS/CSG beginning in 1986 ? Does it support illegal 6502 op-codes too?
This CPU is 100% pin compatible with the 6510 and is used in many boards 250466 and the 64c's 250469. It was made using HMOS process technology which makes it consume a lot less power and produce virtually no heat. Does the change in manufacturing process have the same consequence as with the CMOS 6502 ?
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders
Re: 6510 vs 8500 - support for illegal opcodes ?
At least the stable illegals and the "stable when used in a certain way" ones behave exactly the same.
Re: 6510 vs 8500 - support for illegal opcodes ?
Thanks!tiny tim wrote:At least the stable illegals and the "stable when used in a certain way" ones behave exactly the same.
Do you know of any specific notable difference(s) between the 6510 and 8500 from a programming point of view ?
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders
Re: 6510 vs 8500 - support for illegal opcodes ?
there is none, they behave exactly the same.
Re: 6510 vs 8500 - support for illegal opcodes ?
Not sure I can buy that considering what you posted in other threads...dudz wrote:there is none, they behave exactly the same.
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders
Re: 6510 vs 8500 - support for illegal opcodes ?
not sure if i give a damn, considering what you posted everywhere else.
Re: 6510 vs 8500 - support for illegal opcodes ?
Oh My!...dudz wrote:not sure if i give a damn, considering what you posted everywhere else.
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders
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Re: 6510 vs 8500 - support for illegal opcodes ?
Girls, girls, girls.. You're BOTH pretty. Now stop it.
The price one pays for pursuing any profession, or calling, is an intimate knowledge of its ugly side.
Re: 6510 vs 8500 - support for illegal opcodes ?
^ this, or write test programs!
Re: 6510 vs 8500 - support for illegal opcodes ?
Would be nice if I knew what to look for...tiny tim wrote:^ this, or write test programs!
Wealth, like happiness, is never attained directly. It comes as a by-product of providing a useful service. -Harland D. Sanders
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