mirror of
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80 lines
2.1 KiB
Plaintext
80 lines
2.1 KiB
Plaintext
/********************************************
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* stack - Software Stack Functions for C02 *
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********************************************/
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/* Add to Stack Pointer Address *
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* Internal Utility Function *
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* Args: b - Number of Bytes to Add */
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void stkadd();
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/* Set Stack Start Address *
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* Args: &addr - Start Address */
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void stkbgn();
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/* Decrement Stack Pointer Address *
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* Internal Utility Function */
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void stkdec();
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/* Drop Top Entry from Stack *
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* Returns: A=Number of bytes dropped *
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* 0 if none */
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char stkdrp();
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/* Set Destination to Stack Pointer *
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* Returns: Y,X=Pointer Address */
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void stkdst();
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/* Set Stack End Address *
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* Args: &addr - End Address */
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void stkend();
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/* Increment Stack Pointer Address *
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* Internal Utility Function */
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void stkinc();
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/* Pop Top Stack Entry into Array *
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* Args: n - Number of bytes to write *
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* &m - Array to pop contents into *
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* Returns: A=Number of bytes retrieved *
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* 0 if none */
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char stkpop();
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/* Push Array Contents onto Stack *
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* Args: n - Number of bytes to write *
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* &m - Array containing bytes to push *
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* Returns: A=$FF if bytes were written *
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* $00 if block was overflowed */
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char stkpsh();
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/* Get Stack Pointer Address *
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* Returns: Y,X=Pointer Address */
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void stkptr();
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/* Restore Stack Pointer Address *
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* Internal Utility Function */
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void stkrsp();
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/* Reset Stack Pointer to Stack Start *
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* Returns: Y,X=Pointer Address */
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void stkrst();
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/* Set Stack Pointer Address *
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* Internal Utility Function *
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* Args: &addr - Pointer Address */
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void stkset();
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/* Save Stack Pointer Address *
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* Internal Utility Function */
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void stkssp();
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/* Get Stack Size *
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* Returns: A=$FF if size greater than 0 *
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* $00 if stack is empty *
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* Y,X=Stack size in bytes */
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void stksiz();
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/* Subtract from Stack Pointer Address *
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* Internal Utility Function *
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* Args: b - Number of Bytes to Subtract */
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void stksub();
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