How many registers does a 6502 have?
How many registers does a 6502 have?
The 6502 used in the NES was a second source version by Ricoh, a partial system-on-a-chip, that lacked the binary-coded decimal mode but added 22 memory-mapped registers and on-die hardware for sound generation, joypad reading, and sprite list DMA.
Are 6502 processors still manufactured?
It’s Still in Production The Western Design Center, Inc, founded by Bill Mensch of Motorola and MOS fame, sells modern versions of the 6502 in both the classic 40 pin DIP package (appears to be pin-compatible with the original), as well as more modern surface mount packages.
Which 6502 register can be used for arithmetic operations?
A Accumulator The accumulator is the main register for arithmetic and logic operations.
Is 6502 Assembly still used?
Specifically the 6502, or its successors like the 65C816? The 65C816 is still being made, so someone must use it for something. http://www.6502.org/commercial lists some of these.
Is 6502 a RISC?
Several (common) characteristics of RISC were identified, and the article ultimately concluded that the 6502 was not RISC. One characterstic was a large number of general purpose registers.
Is the 6502 pipelined?
The 6502 was pipelined and the Z80 as well. Pipelining used to refer to the fact that instruction were performed piecemeal in a number of stages requiring multiple clock cycles as opposed to performing the entire instruction in one very long clock cycle.
What happened to MOS?
The deal went through, and while the firm basically became Commodore’s production arm, they continued using the name MOS for some time so that manuals would not have to be reprinted. After a while MOS became the Commodore Semiconductor Group (CSG).
What is an arithmetic of B register?
The logical instructions perform basic AND, OR, XOR, and NOT logical operations on byte, word, and double word values, as described in Table 5.6. Table 5.6. Logical Operation Instructions. Instruction Mnemonic. Example.
Which register is used as a working area in CPU?
Discussion Forum
| Que. | Register used as a working area in CPU is |
|---|---|
| b. | instruction register |
| c. | instruction decoder |
| d. | accumulator |
| Answer:accumulator |
Is 6502 a RISC or CISC?
6502 has multiple instruction sizes, many addressing modes, indirect addressing modes, instructions that combine load/store with arithmetic, instructions that perform multiple data accesses to memory, arbitrary alignment of data, and too few registers. It’s CISC, or at least not RISC.
Who made the 6502?
Bill Mensch
The breakthrough that permitted this cost reduction, says Bill Mensch, who created the 6502 with Peddle, was a minimal instruction set combined with a fabrication process that “yielded 10 times as many good chips as the competition.” The 6502 almost single-handedly forced the price of processors to drop, helping launch …
Is MOS a semiconductor?
The name “metal–oxide–semiconductor” (MOS) typically refers to a metal gate, oxide insulation, and semiconductor (typically silicon). However, the “metal” in the name MOSFET is sometimes a misnomer, because the gate material can also be a layer of polysilicon (polycrystalline silicon).
What is a MOS 6502 CPU?
The Mos 6502 CPU has earned a prominent place in computing history. Owing to its versatility and low cost, the 6502 has been implemented in a myriad of devices including the Apple II, the Commodore 64, and the original Nintendo Entertainment System.
How many registers are in a 6502 microprocessor?
Like its precursor, the 6800, the 6502 has very few registers. The 6502’s registers include one 8-bit accumulator register (A), two 8-bit index registers (X and Y), 7 processor status flag bits (P), an 8-bit stack pointer (S), and a 16-bit program counter (PC).
What kind of consoles use the 6502 microcontroller?
Popular home video game consoles and computers, such as the Atari 2600, Atari 8-bit family, Apple II, Nintendo Entertainment System, Commodore 64, Atari Lynx, BBC Micro and others, used the 6502 or variations of the basic design.
What is the difference between the 6502 and 6800?
The design team had formerly worked at Motorola on the Motorola 6800 project; the 6502 is essentially a simplified, less expensive and faster version of that design. When it was introduced in 1975, the 6502 was the least expensive microprocessor on the market by a considerable margin.
