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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.
In order for the processor to correctly respond to an abort, system logic must assert (negate) the ABORTB input as soon as a valid address has been placed on the bus and it has been determined that the address constitutes a page fault, memory access violation or other anomaly (e.g., attempted execution of a privileged instruction).
The system offers some Unix-like functionality including pre-emptive multitasking, multithreading, semaphores, signals, binary relocation, TCP/IP networking via SLIP, and a 6502 standard library. [2] [3] [4] GeckOS includes native support for the Commodore PET (32 KB and 96 KB models), Commodore 64 and the CS/A65 homebrew system. [5]
Interior of the 6502 Second Processor. The 6502 Second Processor (using a 6502C) was clocked at 3 MHz, a full 50% faster than the 6502 inside a BBC Model B, and also had 64 KB of RAM, of which typically 30–44 KB was free for application data (compared to as little as 8.5 KB on an unexpanded Model B in graphics mode, or only 5.75 KB with the disc interface).
The other major change to the system while running in native mode is that the memory model is expanded to a 24-bit format from the original 16-bit format of the 6502. The 65c816 makes use of two 8-bit registers, the data bank register (DB) and the program bank register (PB), to set bits 16-23 of the address, effectively generating 24-bit addresses.
The Commodore PET is a line of personal computers produced starting in 1977 by Commodore International. [3] A single all-in-one case combines a MOS Technology 6502 microprocessor, Commodore BASIC in read-only memory, keyboard, monochrome monitor, and, in early models, a cassette deck.
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. It was very successful in that period, due to its low price (thanks to the inexpensive 6502 microprocessor) and easy-access expandability.
It used the same MOS Technology 6502 microprocessor as Apple II and BBC Micro, amongst many others. Commissioned by the USSR Ministry of Radio, for many years it was a popular microcomputer in Soviet schools. The Agat was first introduced at a Moscow trade fair in 1983. [3]