Feature	W65C02SXB	W65C816SXB	W65C134SXB	W65C265SXB
Processor Core	W65C02S 8-bit	W65C816S 8/16-bit	W65C02S 8-bit	W65C816S 8/16-bit
Address Bus Width	16-bit	24-bit	16-bit	24-bit
Debug/Code Port	USB-TIDE	USB-TIDE	USB-Terminal	USB-Terminal
Power	USB-5V	USB-5V	USB-5V	USB-5V
Speed (PHI2)	8 MHz	8 MHz	3.6864 MHz 32kHZ Low Power Mode w/ power management	3.6864 MHz 32kHZ Low Power Mode w/ power management
OnChip ROM	NA	NA	4KB MASK ROM	8KB MASK ROM
OnBoard ROM	128KB FLASH (4x32KB)	128KB FLASH (4x32KB)	128KB FLASH (4x32KB)	128KB FLASH (4x32KB)
OnChip RAM	NA	NA	192B	576B
OnBoard RAM	32KB	32KB	32KB	32KB
Serial Interface	VIA - Synchronous ACIA - Asynchronous	VIA - Synchronous ACIA - Asynchronous	1xUART Serial Interface Bus (SIB)	4xUART
Programmable IO	40	40	24	24
Timers	4 (2x2 for the two VIA's)	4 (2x2 for the two VIA's)	4	8
Special Features	NMIB Interrupt IRQB Interrupt WAIt Instruction Capability Compatible Code Generation with the W65C816S CPU	NMIB Interrupt IRQB Interrupt ABORTB Interrupt WAIt Instruction Capability Co-processing Capability Enhanced Pin Functionality Demultiplexed 24-bit Address Bus on XBUS Connector Compatible Code Generation with the W65C02S CPU	Time of Day (22) Priority Encoded Interrupts Watch Dog Timer Serial Interface Bus (SIB)	Time of Day (29) Priority Encoded Interrupts Watch Dog Timer Parallel Interface Bus (PIB) Twin Tone Generators
Price	$189.00	$199.00	$89.00	$99.00