6502 test circuit I have lined up the 6502 and 6522 ICs so that they The 6502 has a relatively basic set of instructions, many having similar functions (e. (Note that the other flag clearing instructions -- CLC, CLD, and CLI -- have corresponding flag setting instructions, namely SEC, SED, and SEI. This includes everything from articles and project descriptions to schematics and source code. org Mar 29, 2025 · The MOS Technology 6502 (P/N 156-1425-00) is an 8-bit microprocessor monolithic integrated circuit introduced in 1975 that was originally developed by a team led by Chuck Peddle at MOS Technology (later purchased by Commodore). As I don't have the money to build something similar myself, I decided to try my hand at writing a 6502 emulator using python. New addressing mode for W65C02S. Its core goals are accuracy, ease of development, clear documentation, and extensive test suites for validating correctness. RC6502 Apple 1 SBC My third Apple 1 clone! A-One, Replica 1 are the other two. Use the online emulator and assembler from the easy6502 tutorial and disassembler from mass:werk For in-depth 6502 investigation and some more advanced features, try our Advanced page. Favourites are: Apple 1 monitor, Apple 6502 W65C02 NOP Tester from Circuit Surgery on TindieThis tester performs a quick test of a 6502 CPU to determine if the chip is likely to be good or is faulty/fake. Stian Søreng wrote the original 6502 simulator in JavaScript. So, why Jan 1, 2025 · Task: Label the 6502 CPU, ANTIC, GTIA, POKEY, and PIA Chips for Easier Troubleshooting Using a Multimeter or Oscilloscope Needed: Printed Pinouts and Double-Sided Tape Time: 10-15 mins Disclosure: Note that as an eBay Partner Network Affiliate, I may earn from qualifying purchases. 1 The Power Supply Unit The power supply unit fitted to the BBC Microcomputer is a switch mode type. Part one shows the construction of a NOP (No-Operation) Tester/Generator for the 6502 Processor, based on the Arduino schematic and code b Forum posts indicate that many members are uncomfortable with interrupts or even misunderstand why they are used. I want to know what exactly each control signal in 6502, how the clock cycles work and additionally I would like to see an example of these control signals producing a single instruction from start to finish. The simulation code and JavaScript demo by Barry and Brian Silverman was many months of work and is used for both chips. A device that can test a 6502 MPU for partial functionality and prove if the device is faulty or fake Designed by Circuit Surgery in United Kingdom Dec 3, 1973 · 6625-00-327-6502 6625003276502 003276502 is a test set specifically designed for use in making examination of plug-in items, commonly referred to as modules or potted components, that are part of an electronic equipment. Versions of 6502 found their way into the Atari 2600, Apple II, Nintendo Entertainment System, Commodore 64, Atari Lynx, BBC Micro and many other computers and game consoles On the E&L breadboard, I wired up a 6502 CPU circuit, to test several questionable 65C02 microprocessors. On this page manuals, most English, some German and other MOS Technology documents User manual Hardware manual Programming manual KIM Hints KIM Application Note #2 Interval timer Operation Circuit diagram poster KIM-2 – KIM-5 manuals, TIM MOS Technology Cross assembler KIMath Subroutines package First Book of KIM (with sources and binaries) MCS6500 Instruction Set Summary cards MOS MOS 6502 Emulator & Interactive Monitor. This model is very accurate and can run classic 6502 programs, including Atari games. Board index » 6502. It is electrically compatible with the 6502 and offers lower power consumption due to the use of CMOS technology. h and 6502. Whether you want to build your own C74-6502, or just learn more about its inner workings, this is the place to dig deeper. The chip and its variants went on to become the main brains of ridiculously seminal computers like the Apple II 6502. Dec 28, 2003 · Addressing Modes The 6502 processor provides several ways in which memory locations can be addressed. The method permits a wide variety of specimen configurations, varying in 2 days ago · A Non-Maskable Interrupt (NMI) signal is one in which the computer cannot ignore or mask. NOP Tester. It's a nice introduction, you Dec 27, 2017 · The C74-6502 is a homemade implementation of the venerable MOS 6502 microprocessor. The utility model discloses a 6502 electric interlocking inserts circuit combined test ware in other direction, including the relay circuit unit, the input output port and the control cabinet. Read-Modify-Write, add 2 cycles. A software engineer by trade, he decided to learn hardware from scratch and within months built his own custom computer based on the 6502. I don't think it's shorted, so does that mean it's a bad CPU? I do have a CPU from my apple II, but I don't want to put it into something that could kill it because it is a vintage chip. The following sections list the complete set of 56 instructions in functional groups. jobjm wsuyt gvnih uco pljv nlmg ehzruz gnwqv blqu jmbse cce blcti izarlj dnfnhg bbeu