@%Enclosed in the following short article is a short description of the R65C02 Microprocessor made by Rockwell. For those 8 bitters who are looking for a cheap upgrade to a pet or those 64/128 owners who want a few extra commands to their microprocessor.(note that the pins of an 6502 are not compatible to an 6510 or a 8502). This information is handed out by Rockwell and is in the public domain. Features CMOS silicon gate technology Low Power (4ma/mhz) Software compatible with the R6502 Single 5v power supply requirements Eight bit parallel processing Decimal and Binary aritmitic True indexing cabability Programable Stack Pointer Interupt Capability Non maskable interupt Direct Memory Access Capability (DMA) 4mhz operating speed Listing of R65C00 additional opcommands BBR Branch on Bit Reset BBS Branch on Bit Set BRA Branch always PHX Push x register on stack PHY Push y register on stack PLX Pull x register from stack PLY pull y register from stack RMB reset memory bit SMB set memory bit STZ Store Zero TRB test and reset bits TSB test and set bits Listing of old opcommands with new address modes ADC add memory to accumulator with cary AND and memory with accumulator BIT test bits in memory with accumulatr CMP compare memory and accumulator DEC decrement memory by 1 EOR exclusuve or memory with accumultr INC increment memory by 1 JMP jump to a new location LDA load accumulator with memory ORA "or" memory with accumulator STA Store memory with accumulator OPCODE Mnemonic Address Bytes Cycles 80 BRA Relative 2 3 DA PHX Implied 1 3 5A PHY Implied 1 3 FA PLX Implied 1 4 7A PLY Implied 1 4 9C STZ Absolte 3 4 9E STZ AbsolutX 3 5 64 STZ ZeroPage 2 5 74 STZ ZeroPagX 2 4 1C TRB Absolute 3 6 14 TRB ZeroPage 2 5 0C TSB Absolute 3 6 04 TSB Zeropage 2 5 0F-7F BBR Zeropage 3 5 8F-FF BBS Zeropage 3 5 07-77 RMB ZeroPage 2 5 87-F7 SMB ZeroPage 2 5 Hex codes for old opcodes with new address Hex Mnemonic New address Bytes Cycles 72 ADC Indirect 2 5 32 AND Indirect 3 5 3C BIT Absolute,X 3 4 34 BIT Zeropage,X 3 4 89 BIT Immeadite 2 2 D2 CMP Indirect 2 5 3A DEC Accumulator 1 2 52 EOR Indirect 2 5 1A INC Accumulator 1 2 7C JMP Absolute,X 3 6 B2 LDA Indirect 2 5 12 ORA Indirect 2 5 F2 SBC Indirect 3 5 92 STA Indirect 2 5 New Opcode effects on registers Opcode Processor Status Code . 7 6 5 4 3 2 1 0 . n v . b d i z c bra phx phy plx x x ply x x stz x x trb x bbr bbs rmb smb