Memory Access Commands

( x a-addr -- ) 

Store a number at a-addr.

( nu a-addr -- ) 

Add nu to the number stored at a-addr.

( a-addr -- x ) 

Fetch a number from a-addr.

( x1 x2 a-addr -- ) 

Store 2 numbers at a-addr, x2 at lower address.

( a-addr -- x1 x2 )  

Fetch 2 numbers from a-addr, x2 from lower address.

( addr len -- ) 

Set len bytes of memory beginning at addr to the space character (decimal 32).

( byte addr -- ) 

Store byte at addr.

( addr -- byte ) 

Fetch a byte from addr.

( addr -- false | byte true ) 

Attempt to fetch the byte at addr. Return the data and true if the access was successful. Return false if a read access error occurred.

( byte addr -- okay? ) 

Attempt to store the byte to addr. Return true if the access was successful. Return false if a write access error occurred.

( addr1 addr2 len -- diff? ) 

Compare two byte arrays. diff? is 0 if the arrays are identical, diff? is -1 if the first byte that is different is lesser in the string at addr1, diff? is 1 otherwise.

( addr len -- ) 

Display len bytes of memory starting at addr.

( addr len -- ) 

Set len bytes of memory beginning at addr to 0.

( addr len byte -- ) 

Set len bytes of memory beginning at addr to the value byte.

( quad qaddr -- ) 

Store a quadlet q at qaddr.

( qaddr -- quad ) 

Fetch a quadlet q from qaddr.

( qaddr len -- ) 

Reverse the bytes within each quadlet in the specified region. 

( qaddr len -- ) 

Swap the doublets within each quadlet in specified region. 

( qaddr -- false | quad true ) 

Attempt to fetch the 32-bit quantity at qaddr. Return the data and true if the access was successful. Return false if a read access error occurred.

( quad qaddr -- okay? ) 

Attempt to store the 32-bit quantity at qaddr. Return true if the access was successful. Return false if a a write access error occurred.

( src-addr dest-addr len -- ) 

Copy len bytes from src-addr to dest-addr.

( a-addr -- ) 

Store false at a-addr.

( a-addr -- ) 

Store true at a-addr.

( quad addr -- ) 

Store a quadlet q, any alignment

( addr -- quad ) 

Fetch a quadlet q, any alignment.

( w addr -- ) 

Store a doublet w, any alignment.

( addr -- w ) 

Fetch a doublet w, any alignment.

( w waddr -- ) 

Store a doublet w at waddr.

( waddr -- w) 

Fetch a doublet w from waddr.

( waddr -- n ) 

Fetch doublet w from waddr, sign-extended.

( waddr len -- ) 

Swap the bytes within each doublet in the specified region. 

( waddr -- false | w true ) 

Attempt to fetch the 16-bit quantity at waddr. Return the data and true if the access was successful. Return false if a read access error occurred.

( w waddr -- okay? ) 

Attempt to store the 16-bit quantity to waddr. Return true if the access was successful. Return false if a write access error occurred.