Brian Cassidy > Games-NES-Emulator > CPU::Emulator::6502

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NAME ^

CPU::Emulator::6502 - Class representing a 6502 CPU

SYNOPSIS ^

DESCRIPTION ^

REGISTERS

METHODS ^

new( )

init( )

create_instruction_table

Dynamically loads all instructions from the CPU::Emulator::6502::Op namespace and creates a table.

reset( )

Simulate a hardware reset or power-on

RAM_read( $address )

Reads data from $address in memory.

RAM_write( $address => $data )

Writes $data to $address in memory.

interrupt_request()

execute_instruction( )

get_instruction( )

Reads the op from memory then moves the program counter forward 1.

debug( )

This will return of a string with some debugging info, including: the current instruction, the pc location of the instruction, 10 lines of context from the PRG at the pc location and the state of the stack, sp, a, x, y and status registers after the op has executed.

set_nz( $value )

Sets the Sign and Zero status flags based on $value.

push_stack( $value )

Pushes $value onto the stack and decrements the stack pointer.

pop_stack( )

Increments the stack pointer and returns the current stack value.

branch_if( $bool )

Branches if $bool is true.

make_word( $lo, $hi )

Combines $lo and $hi into a 16-bit word.

lo_byte( $word )

Returns the lower byte of $word.

hi_byte( $word )

Returns the higher byte of $word.

AUTHOR ^

Brian Cassidy <bricas@cpan.org>

COPYRIGHT AND LICENSE ^

Copyright 2007 by Brian Cassidy

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO ^

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