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Most 8051 clones also have a full 256 bytes of IRAM. Direct accesses to the IRAM addresses 0x80–0xFF are, instead, mapped onto the special function registers (SFR), where the accumulators A, B, carry bit C, and other special registers for control, status, etc., are located.
IRAM: F1: Register File Override Prefix. Will cause memory operands to index into register file rather than general memory. BSCH r/m8 BSCH r/m16: 0F 3C /0 0F 3D /0: Count Trailing Zeroes and store result in CL. Sets ZF=1 for all-0s input. RSTWDT imm8,imm8: 0F 96 ib ib: Watchdog Timer Manipulation Instruction. BTCLRL imm8,imm8,cb: 0F 9D ib ib rel8
One of the major improvements the PCI Local Bus had over other I/O architectures was its configuration mechanism. In addition to the normal memory-mapped and I/O port spaces, each device function on the bus has a configuration space, which is 256 bytes long, addressable by knowing the eight-bit PCI bus, five-bit device, and three-bit function numbers for the device (commonly referred to as the ...
Generally, IRAM is composed of very high speed SRAM located alongside of the CPU. It acts similar to a CPU cache , but is software addressable. This saves transistors and power, and is potentially much faster, but forces programmers to specifically allocate it in order to benefit.
The ELM327 is a programmed microcontroller produced for translating the on-board diagnostics (OBD) interface found in most modern cars. The ELM327 command protocol is one of the most popular PC-to-OBD interface standards and is also implemented by other vendors.
Although not technically a clone, Quadram produced an add-in ISA card, called the Quadlink, that provided hardware emulation of an Apple II+ for the IBM PC. [13] The card had its own 6502 CPU and dedicated 80 K RAM (64 K for applications, plus 16 K to hold a reverse-engineered Apple ROM image, loaded at boot-time), and installed "between" the PC and its floppy drive(s), color display, and ...
United States Transportation Command is now responsible for moving her personal effects out of the house. "She was given a different place to stay," the DHS official said. "We’re still providing ...
The Berkeley IRAM project was a 1996–2004 research project in the Computer Science Division of the University of California, Berkeley which explored computer architecture enabled by the wide bandwidth between memory and processor made possible when both are designed on the same integrated circuit (chip). [1]