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134 lines
5.1 KiB
Plaintext
134 lines
5.1 KiB
Plaintext
Standard Definitions for C02 Library Functions
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This module includes constant and function definitions common to the
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entire standard library.
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At the beginning of the program use the directives
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#include <stddef.h02>
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The following constants are defined:
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#TRUE The byte 255, $FF, or %11111111, representing
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the true condition.
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#FALSE The byte 0, $00 or %00000000, representing the
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false condition.
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The following functions are defined:
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savreg(); Saves the A, X, and Y registers.
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Note: Stores A, X, and Y in temp0, temp1, and
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temp2, respectively.
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savrxy(); Saves only the X and Y registers.
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Note: This is an alternate entry point into
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the savreg function, which stores X and Y in
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temp1 and temp2, respectively.
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resreg(); Restore the A, X, and Y registers.
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Note: Loads A, X, and Y from temp0, temp1, and
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temp2, respectively.
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resrxy(); Resrtores only the X and Y registers.
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Note: This is an alternate entry point into
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the resreg function, which loads X and Y from
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temp1 and temp2, respectively.
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setsrc(&d); Sets the source pointer to address d.
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Note: Stores the least significant byte,
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passed in the X register, in srclo, and the
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most significant byte, passed in the Y
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register, to srchi.
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setdst(&d); Sets the destination pointer to address d.
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Note: Stores the least significant byte,
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passed in the X register, in destlo, and the
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most significant byte, passed in the Y
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register, to desthi.
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setdss(); Sets the destination pointer to the source
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pointer.
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Note: Calls the getsrc function, followed by
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the setdst function, copying srclo and srchi
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to dstlo and dsthi, respectively.
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setsrd(); Sets the source pointer to the destination
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pointer.
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Note: Calls the getdst function, followed by
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the setsrc function, copying dstlo and dsthi
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to srclo and srchi, respectively.
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*,hi,lo=getsrc(); Gets the address in the source pointer,
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returning the least significant byte in lo
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and the most significant byte in hi.
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Note: Loads the srclo into the X register and
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srchi into the Y.
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*,hi,lo=getdst(); Gets the address in the destination pointer,
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returning the least significant byte in lo
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and the most significant byte in hi.
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Note: Loads the dstlo into the X register and
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dsthi into the Y.
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savsrc(); Saves the destination pointer.
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Note: Calls the getsrc function, followed by
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the savrxy function, copying srclo and srchi
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to temp1 and temp2, respectively.
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savdst(); Saves the destination pointer.
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Note: Calls the getdst function, followed by
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the savrxy function, copying dstlo and dsthi
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to temp1 and temp2, respectively.
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ressrc(); Restores the source pointer.
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Note: Calls the resrxy function, followed by
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the setsrc function, copying temp1 and temp2
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to srclo and srchi, respectively.
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resdst(); Restores the destination pointer.
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Note: Calls the resrxy function, followed by
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the setdst function, copying temp1 and temp2
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to dstlo and dsthi, respectively.
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addzpw(z,&n); Adds the 16 bit value &n to the zero page word
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with address z.
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Note: Stores the zero page address in temp3.
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adddst(&n); Adds the 16 bit value &n to the destination
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pointer.
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Note: Calls the addzpw function, passing dstlo
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as the first argument.
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addsrc(&n); Adds the 16 bit value &n to the source pointer.
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Note: Calls the addzpw function, passing srclo
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as the first argument.
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Note: This library expects the following to be defined:
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the zero page variables
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srclo,srchi Source pointer
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dstlo,dsthi Destination pointer
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and the transient variables
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temp0,temp1,temp2 Temporary storage
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