LDA INWK+27 \ Set A = the ship's speed in byte #24 + the ship's CLC \ acceleration in byte #28 ADC INWK+28 BPL P%+4 \ If the result is positive, skip the following \ instruction LDA #0 \ Set A to 0 to stop the speed from going negative LDY #15 \ We now fetch byte #15 from the ship's blueprint, which \ contains the ship's maximum speed, so set Y = 15 to \ use as an index CMP (XX0),Y \ If A < the ship's maximum speed, skip the following BCC P%+4 \ instruction LDA (XX0),Y \ Set A to the ship's maximum speed STA INWK+27 \ We have now calculated the new ship's speed after \ accelerating and keeping the speed within the ship's \ limits, so store the updated speed in byte #27 LDA #0 \ We have added the ship's acceleration, so we now set STA INWK+28 \ it back to 0 in byte #28, as it's a one-off changeName: MVEIT (Part 4 of 9) [Show more] Type: Subroutine Category: Moving Summary: Move current ship: Apply acceleration to ship's speed as a one-offContext: See this subroutine in context in the source code References: No direct references to this subroutine in this source file
This routine has multiple stages. This stage does the following: * Apply acceleration to the ship's speed (if acceleration is non-zero), and then zero the acceleration as it's a one-off change
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Temporary storage, used to store the address of a ship blueprint. For example, it is used when we add a new ship to the local bubble in routine NWSHP, and it contains the address of the current ship's blueprint as we loop through all the nearby ships in the main flight loop