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  2. MOS Technology 6502 - Wikipedia

    en.wikipedia.org/wiki/MOS_Technology_6502

    With the 5/6 cycle "(indirect),y" mode, the 8-bit Y register is added to a 16-bit base address read from zero page, which is located by a single byte following the opcode. The Y register is therefore an index register in the sense that it is used to hold an actual index (as opposed to the X register in the 6800, where a base address was ...

  3. Pulse-width modulation - Wikipedia

    en.wikipedia.org/wiki/Pulse-width_modulation

    The Sega 32X uses PWM to play sample-based sound in its games. In more recent times, the Direct Stream Digital sound encoding method was introduced, which uses a generalized form of pulse-width modulation called pulse-density modulation , at a high enough sampling rate (typically in the order of MHz) to cover the whole acoustic frequencies ...

  4. Zero page - Wikipedia

    en.wikipedia.org/wiki/Zero_page

    The zero page or base page is the block of memory at the very beginning of a computer's address space; that is, the page whose starting address is zero. The size of a page depends on the context, and the significance of zero page memory versus higher addressed memory is highly dependent on machine architecture.

  5. Return-to-zero - Wikipedia

    en.wikipedia.org/wiki/Return-to-zero

    The binary signal is encoded using rectangular pulse-amplitude modulation with polar return-to-zero code. Return-to-zero (RZ or RTZ) describes a line code used in telecommunications signals in which the signal drops (returns) to zero between pulses. This takes place even if a number of consecutive 0s or 1s occur in the signal. The signal is ...

  6. RP2040 - Wikipedia

    en.wikipedia.org/wiki/RP2040

    RP2040-Zero [33] Waveshare Electronics 23×18 23 USB-C 10-pad connector 2 MB 29 4 BOOTSEL + RESET RGB LED (WS2812) Pico2040 zeankun.dev 51x18 40+3 (2mm and 2.54mm variants are available) SWD 4 micro-USB 16 MB, 32 MB, 64 MB, 128 MB 28 4 BOOTSEL + RESET Bus Pirate 5 Where Labs, LLC 60x37 10+9 SWD USB-C 16MB W5100S-EVB-Pico [34] WIZnet Co., Ltd ...

  7. Non-return-to-zero - Wikipedia

    en.wikipedia.org/wiki/Non-return-to-zero

    The binary signal is encoded using rectangular pulse-amplitude modulation with polar NRZ(L), or polar non-return-to-zero-level code. In telecommunications, a non-return-to-zero (NRZ) line code is a binary code in which ones are represented by one significant condition, usually a positive voltage, while zeros are represented by some other significant condition, usually a negative voltage, with ...

  8. V850 - Wikipedia

    en.wikipedia.org/wiki/V850

    Register 0 (R0) is fixed as the Zero Register which always contains zero. In the V850, R30 is implicitly used by the sld and sst instructions. 16-bit short-format load/store instructions use element pointer (ep) , where the addressing mode comprises the base address register ep and immediate-operand offsets.

  9. PIC microcontrollers - Wikipedia

    en.wikipedia.org/wiki/PIC_microcontrollers

    The ROM address space is 512 and may only specify addresses in the first half of each 512-word page. That is, the CALL instruction specifies the low 9 bits of the address, but only the low 8 bits of that address are a parameter of the instruction, while the 9th bit (bit 8) is implicitly specified as 0 by the CALL instruction itself.