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c128lib Base
Base macros for C128
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c128lib Base
Base macros for C128
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Math module. More...
Functions | |
| macro | c128lib_Add16 (value, dest) |
| This macro performs a 16-bit addition operation. | |
| macro | c128lib_Sub16 (value, dest) |
| This macro performs a 16-bit subtraction operation. | |
| macro | c128lib_Asl16 (address) |
| This macro performs a 16-bit arithmetic shift left (ASL) operation. | |
| macro | c128lib_Inc16 (address) |
| This macro performs a 16-bit increment operation. | |
| macro | c128lib_Dec16 (address) |
| This macro performs a 16-bit decrement operation. | |
| macro | c128lib_Div16By16 (dividend, divisor, remainder) |
| Divides a 16 bit number by a 16 bit number. | |
| macro | c128lib_Div16By8 (dividend, divisor, remainder) |
| Divides a 16 bit number by a 8 bit number. | |
Math module.
Simple macros for math operations.
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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| macro c128lib_Add16 | ( | value | , |
| dest | ) |
This macro performs a 16-bit addition operation.
The macro uses the 6502 processor's ADC (Add with Carry) instruction to perform the addition. It first clears the carry flag with CLC, then adds the low byte of the value to the low byte at the destination, and stores the result back in the low byte at the destination. It then adds the high byte of the value to the high byte at the destination, taking into account any carry from the low byte addition, and stores the result back in the high byte at the destination.
| [in] | value | The 16-bit value to add. |
| [in,out] | dest | The memory location of the other 16-bit value. |
| macro c128lib_Sub16 | ( | value | , |
| dest | ) |
This macro performs a 16-bit subtraction operation.
The macro uses the 6502 processor's SBC (Subtract with Carry) instruction to perform the subtraction. It first sets the carry flag with SEC, then subtracts the low byte of the value from the low byte at the destination, and stores the result back in the low byte at the destination. It then subtracts the high byte of the value from the high byte at the destination, taking into account any borrow from the low byte subtraction, and stores the result back in the high byte at the destination.
| [in] | value | The 16-bit value to subtract. |
| [in,out] | dest | The memory location of the other 16-bit value. |
| macro c128lib_Asl16 | ( | address | ) |
This macro performs a 16-bit arithmetic shift left (ASL) operation.
The macro uses the 6502 processor's ASL (Arithmetic Shift Left) instruction to perform the shift. It first shifts the low byte at the value location left, then shifts the high byte at the value location left, taking into account any carry from the low byte shift.
| [in,out] | address | The memory location of the 16-bit value to shift left. |
| macro c128lib_Inc16 | ( | address | ) |
This macro performs a 16-bit increment operation.
The macro uses the 6502 processor's INC (INCrement memory) instruction to perform the decrement. It first increments the low byte at the destination. If this results is zero, it then increments the high byte at the destination.
| [in,out] | address | The memory location of the 16-bit value to increment. |
| macro c128lib_Dec16 | ( | address | ) |
This macro performs a 16-bit decrement operation.
The macro uses the 6502 processor's DEC (DECrement memory) instruction to perform the decrement. It first decrements the low byte at the destination. If this results in a borrow (i.e., the low byte was 0 and becomes 0xFF), it then decrements the high byte at the destination.
| [in,out] | address | The memory location of the 16-bit value to decrement. |
| macro c128lib_Div16By16 | ( | dividend | , |
| divisor | , | ||
| remainder | ) |
Divides a 16 bit number by a 16 bit number.
Divides the two-byte number dividend by the two-byte number divisor, leaving the quotient in dividend and the remainder in remainder. Addressing mode of 16-bit numbers uses little endian.
| [in,out] | dividend | dividend and also quotient |
| [in] | divisor | divisor |
| [out] | remainder | remainder (wide as divisor) |
| macro c128lib_Div16By8 | ( | dividend | , |
| divisor | , | ||
| remainder | ) |
Divides a 16 bit number by a 8 bit number.
Divides the two-byte number dividend by the one-byte number divisor, leaving the quotient in dividend and the remainder in remainder. Addressing mode of 16-bit numbers uses little endian.
| [in,out] | dividend | dividend and also quotient |
| [in] | divisor | divisor |
| [out] | remainder | remainder (wide as divisor) |
1.11.0