MOS Technology 6510

Short history

MOS Technology, Inc was a company specialised in semiconductor design and fabrication. It is most well known for the MOS 6502 that was designed by Chuck Peddle and Bill Mensch. It was released in 1975 and is a big contributor to the home computer revolution in the 1980s.

Notable home computers that used this processor include the Atari 8-bit models, Apple II, Commodore 64, Nintendo Family Computer (Famicom) and Entertainment System (NES). It also functions as the blueprint for the subsequent development of 16-bit processors that were used in Nintendo’s Super Nintendo Entertainment System (SNES).

Specifications

CPU clock rate:1 MHz to 2 MHz Package:40-pin DIP

Mnemonics

• ADC - Add Memory to Accumulator with Carry
• AND - “AND” Memory with Accumulator
• ASL - Shift Left One Bit (Memory or Accumulator)
• BCC - Branch on Carry Clear
• BCS - Branch on Carry Set
• BEQ - Branch on Result Zero
• BIT - Test Bits in Memory with Accumulator
• BMI - Branch on Result Minus
• BNE - Branch on Result not Zero
• BPL - Branch on Result Plus
• BRK - Force Break
• BVC - Branch on Overflow Clear
• BVS - Branch on Overflow Set
• CLC - Clear Carry Flag
• CLD - Clear Decimal Mode
• CLI - Clear interrupt Disable Bit
• CLV - Clear Overflow Flag
• CMP - Compare Memory and Accumulator
• CPX - Compare Memory and Index X
• CPY - Compare Memory and Index Y
• DEC - Decrement Memory by One
• DEX - Decrement Index X by One
• DEY - Decrement Index Y by One
• EOR - “Exclusive-Or” Memory with Accumulator
• INC - Increment Memory by One
• INX - Increment Index X by One
• INY - Increment Index Y by One
• JMP - Jump to New Location
• JSR - Jump to New Location Saving Return Address
• LDA - Load Accumulator with Memory
• LDX - Load Index X with Memory
• LDY - Load Index Y with Memory
• LSR - Shift Right One Bit (Memory or Accumulator)
• NOP - No Operation
• ORA - “OR” Memory with Accumulator
• PHA - Push Accumulator on Stack
• PHP Push Processor Status on Stack
• PLA - Pull Accumulator from Stack
• PLP - Pull Processor Status from Stack
• ROL - Rotate One Bit Left (Memory or Accumulator)
• ROR - Rotate One Bit Right (Memory or Accumulator)
• RTI - Return from Interrupt
• RTS - Return from Subroutine
• SBC - Subtract Memory from Accumulator with Borrow
• SEC - Set Carry Flag
• SED - Set Decimal Mode
• SEI - Set Interrupt Disable Status
• STA - Store Accumulator in Memory
• STX - Store Index X in Memory
• STY - Store Index Y in Memory
• TAX - Transfer Accumulator to Index X
• TAY - Transfer Accumulator to Index Y
• TSX - Transfer Stack Pointer to Index X
• TXA - Transfer Index X to Accumulator
• TXS - Transfer Index X to Stack Pointer
• TYA - Transfer Index Y to Accumulator