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  • How are 6502 and 65C02 JMP (abs) processed internally
    The 65C02 also adds JMP (ind,X) which is also unconditionally 6 cycles Logically, JMP (ind) could be implemented using the same microcode but with the index forced to zero The 65816 has JMP (ind) with 5 cycles but JMP (ind,X) still takes 6; in the latter, the "internal operation" cycle is the fourth, just before reading the indirected address
  • When did the 65C02 become available? - Retrocomputing Stack Exchange
    The Wikipedia article on the 65C02 is missing an introduction date for any of the mentioned models I did a bit of poking about with no success Does anyone know when they were introduced?
  • How did the Trap65 work? - Retrocomputing Stack Exchange
    During all other times (the decoder detects a "normal" 65C02 instruction being fetched, or the decoder sees a normal data LOAD or STORE where the SYNC pin doesn't pulse) -- that decoder enables the transceiver that connects the memory data bus and the CPU data bus normally
  • What are the normal signals on a 65C02 in an Apple IIe?
    65C02 is a CMOS version of 6502 (which was NMOS) chip Judging from Wikipedia articles on these chips and few of the datasheets I found, it seems like it should work exactly the same way it did on 6502, i e held high during normal operation, pulled low to fire an interrupt
  • Did the Apple IIe Platinum include all feature enhancements from the . . .
    Yes, all the enhancements that were part of the Enhanced Apple e were included in the Apple e Platinum Edition So the stock system provided 80-column text, Double Hi-Res, 128K of RAM, 65C02 microprocessor, and all previous ROM updates To my knowledge, the only "official" upgrade path available to the Platinum Edition owner was to swap the motherboard to make it an Apple IIgs
  • Recently Active Questions - Page 18 - Retrocomputing Stack Exchange
    Q A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
  • Why didnt the 6502 have increment decrement opcodes for A?
    Unlike adc and sbc, the instructions to increment and decrement also do not heed the decimal mode This might have been seen as a shortcoming early on, as the design was coming together (Later, with the 65C02, the instruction you are talking about was added, and variously called INA, INC A or INC )
  • overclocking - How can I overclock my Commodore 64? - Retrocomputing . . .
    They have all in common using a WDC 65C816 CPU, a 16-bit expanded version of a 65C02 With some luck a program or game runs even on such a plain 6502 (without any dirty 6510 opcodes) and can handle the faster timing In hard cases you can switch back to the 6510-only mode The above mentioned problem with VIC and I O access is solved differently
  • Comprehensive test suites for MOS 6520 PIA 6522 VIA 6526 CIA
    Are there any automated test suites for MOS 6520, 6522 and 6526 chips? I am looking for test suites aimed at making sure datasheet-based independent reimplementations of the above chips (e g FPGAs





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