*[https://www.nesdev.org/wiki/CPU_unofficial_opcodes Opcode matrix arrangement]
*[https://www.oxyron.de/html/opcodes02.html Oxyron Opcode Matrix]
*[http://www.6502.org/documents/datasheets/synertek/synertek_programming_manual.pdf Synertek SY650x programming manual (250 pages)]
*[http://www.6502.org/documents/datasheets/synertek/synertek_hardware_manual.pdf Synertek SY650x hardware manual (178 pages)]
*[[Media:SY6500 - SY65C02 datasheet.pdf]] - provides a detailed breakdown of the machine cycles
*[[Media:6502 (65xx) Microprocessor Instant Reference Card.pdf]]