libsidplayfp  1.0.3
Public Member Functions
ZeroRAMBank Class Reference

#include <ZeroRAMBank.h>

Inheritance diagram for ZeroRAMBank:
Bank

List of all members.

Public Member Functions

 ZeroRAMBank (PLA *pla, Bank *ramBank)
void reset ()
uint8_t peek (uint_least16_t address)
void poke (uint_least16_t address, uint8_t value)

Detailed Description

Area backed by RAM, including cpu port addresses 0 and 1.

This is bit of a fake. We know that the CPU port is an internal detail of the CPU, and therefore CPU should simply pay the price for reading/writing to 0/1.

However, that would slow down all accesses, which is suboptimal. Therefore we install this little hook to the 4k 0 region to deal with this.

Implementation based on VICE code.

Author:
Antti Lankila

Member Function Documentation

uint8_t ZeroRAMBank::peek ( uint_least16_t  address) [inline, virtual]

Bank read. You probably should override this method, except if the Bank is only used in write context.

Parameters:
addressvalue to read from
Returns:
value at address

Implements Bank.

void ZeroRAMBank::poke ( uint_least16_t  address,
uint8_t  value 
) [inline, virtual]

Bank write.

Override this method if you expect write operations on your bank. Leave unimplemented if it's logically/operationally impossible for writes to ever arrive to bank.

Parameters:
addressaddress to write to
valuevalue to write

Implements Bank.


The documentation for this class was generated from the following file: