#6502 emulator online for free#

Each chip also has a 4 bit input-output (I/0) port which is used to route information to and from the data bus lines in and out of the system.Д¤002-RAM - The 4002 performs two functions. Each chip is organized as 256 x 8 bit words which can be used for storing programs or data tables. Each 40 has 4 I/O lines for communication with I/O devices.Д¤001-ROM - The 4001 is a 2048 Bit metal mask programmable ROM providing custom microprogramming capability for the MCS-4 micro computer set.

The I/O function, although different from the ROM and RAM functions, is physically located in the ROM and RAM chips. With the addition of few gates up to 48 ROMS & RAMS combined and 192 I/O lines can be controlled by one CPU. One CPU controls up to 16 ROM's (4K x 8 words), 16 RAM's (1280 x 4 words), and 128 I/O lines without requiring any interface circuit. This single data bus is used for all information flow between the chips except for control signals which are sent to RAM and ROM over 5 additional lines. The MCS-4 set has been designed for optimum interfaceability the CPU communicates with the RAM's and ROM's by means of a 4-line data bus (D0, D1, D2, D3). The ROM stores microprograms and data tables, the RAM stores data and instructions, and the Shift Register is used in conjunction with I/O devices to effectively increase the number of I/O lines. The CPU contains the control unit and the arithmetic unit of a general purpose microprogrammable computer. (3) A Random Access Memory Chip - RAM-4002 (1) A Central Processor Unit Chip - CPU-4004 The MCS-4 micro computer set consists of the following 4 chips, each packaged in a 16 pin DIP package: The only custom part is the ROM chip which will store a microprogram defined by the user and requires a metal mask option for each new program. В» Memory capacity expandable through bank switchingД®ach MCS-4 circuit constitues a basic standard building block which allows the design of many different types of systems which can be fabricated using the same parts. В» No interface circuitry to memory and I/O required В» Instruction Set includes conditional branching, jump to subroutine, В» Sixteen 4-bit general purpose registers В» Addition of Two 8-digit numbers in 850 usec. В» 4-bit parallel CPU with 45 instructions Other Applications - The elements of the MCS-4 have many applications within transportation, automotive, medical electronics and test systems, where inexpensive dedicated computers can improve system performance. In addition, the MCS-4 can be efficiently used to decentralize central computer functions. For example, the adding of two 8-digit numbers can be done in 850 microseconds. By changing ROM microprograms the whole system can easily be modified and updated.Д¬omputer Peripherals - The system can be conveniently used in peripheral equipment to control displays, keyboards, printers, readers, plotters and to give intelligence to terminals.Д¬omputing Systems - The MCS-4 system is ideally suited for such devices as billing machines, cash registers, point of sale terminals and accounting machines.

The microprograms stored in the ROM devices give the designer the power of designing custom computers with standard components.Д¬ontrol Functions - Because of low initial cost and flexibility of programming, the MCS-4 can be used in place of random logic in systems such as those in process control, numeric controls, elevator controls, highway and rail traffic controls. Which allows the system to perform a wide variety of arithmetic, control and decision functions. Heart of the MCS-4 micro computer set is the 4004 CPU.

#6502 emulator online for free#

This program is provided for free and AS IS, therefore without any warranty. The MCS-4 utilities core and GUI are based on the brilliant virtual 6502 emulator by Norbert Landsteiner,. The emulator, assembler and disassembler is written in JavaScript, so they are easy to execute on whatever platform with the internet browser and implemented JavaScript interpreter. Intel 4004 emulator assembler disassembler