Search results
Results from the WOW.Com Content Network
One popular 6502-based computer, the Commodore 64, used a modified 6502 CPU, the 6510. Unlike the 6503–6505 and 6507, the 6510 is a 40-pin chip that adds internal hardware: a 6-bit parallel I/O port mapped to addresses 0000 and 0001.
Main page; Contents; Current events; Random article; About Wikipedia; Contact us
The CSG 65CE02 is an 8/16-bit microprocessor developed by Commodore Semiconductor Group in 1988. [1] It is a member of the MOS Technology 6502 family, developed from the CMOS WDC 65C02 released by the Western Design Center in 1983.
The basic architecture of the 65C02 is identical to the original 6502, and can be considered a low-power implementation of that design. At 1 MHz, the most popular speed for the original 6502, the 65C02 requires only 20 mW, while the original uses 450 mW, a reduction of over twenty times. [4]
MOS 6502 emulator (experimental), able to run MOS 6502 machine code. [ 5 ] [ 6 ] The video output is generated by the ROM firmware (native assembly code), and supports a resolution of 160x120 pixels with 64 colours stored in RAM starting at address 0x 0800 and ending at 0x7F9F as 120 segments of 160 bytes of non-contiguous RAM.
The methods by which the MPU state is preserved and restored within an ISR will vary with the different versions of the 65xx family. For NMOS processors (e.g., 6502, 6510, 8502, etc.), there can be only one method by which the accumulator and index registers are preserved, as only the accumulator can be pushed to and pulled from the stack. [5]
It is a modified form of the very successful 6502. The 6510 is widely used in the Commodore 64 (C64) home computer and its variants. It is also used in the Seagate ST-251 MFM harddisk. [1] The primary change from the 6502 is the addition of an 8-bit general purpose I/O port
Most other machines, notably home computers based on the 650x architecture, use either the standard 6502 or extended versions of it, in order to allow for more memory. By the time the 6502 line was becoming widely used around 1980, ROM and RAM semiconductor memory prices had fallen to the point where the 6507 was no longer a worthwhile ...