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The most significant byte (MSB) of the aborted instruction's address is pushed onto the stack. The least significant byte (LSB) of the aborted instruction's address is pushed onto the stack. The status register is pushed onto the stack. The interrupt disable flag is set in the status register. PB is loaded with $00.
More importantly, the style of access changed. In the 6800, IX held a 16-bit address which was offset by an 8-bit number stored with the instruction and added to the address. In the 6502 (and most other contemporary designs), the 16-bit base address was stored in the instruction, and the 8-bit X or Y was added to it. [44]
The Mitsubishi 740 family has a processor core that executes a superset of the 6502 instruction set including many of the extensions added in the 65C02. There is a core set of new instructions common across all 740 family members, plus other instructions that exist in specific parts. [1]
In 6502 assembly language, the above two instructions both accomplish the same thing: they load the value of memory location $12 into the .A (accumulator) register ($ is Motorola/MOS Technology assembly language notation for a hexadecimal number). However, the first instruction is only two bytes long and requires three clock cycles to complete.
The Mensch Computer is a personal computer system produced by the Western Design Center (WDC). It is based on the WDC 65C265 microcontroller, which implements the instruction sets of two microprocessors: the 16-bit W65C816/65816, and the 8-bit 6502. [1]
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 ROM firmware and the vCPU interpreter are written in the 8-bit native assembly code. 16-bit vCPU interpreter, that implements a von Neumann architecture and has 34 instructions. It loads and runs programs from RAM. The integrated programs are written for this vCPU. MOS 6502 emulator (experimental), able to run MOS 6502 machine code. [5] [6]
KIM-1 computer in operation. The KIM-1, short for Keyboard Input Monitor, is a small 6502-based single-board computer developed and produced by MOS Technology, Inc. and launched in 1976.