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Universe: NWSPS

[BBC Micro cassette version]

Name: NWSPS [Show more] Type: Subroutine Category: Universe Summary: Add a new space station to our local bubble of universe
Context: See this subroutine in context in the source code Variations: See code variations for this subroutine in the different versions References: This subroutine is called as follows: * Main flight loop (Part 14 of 16) calls NWSPS * TT110 calls NWSPS
.NWSPS JSR SPBLB \ Light up the space station bulb on the dashboard LDX #%00000001 \ Set the AI flag in byte #32 to %00000001 (friendly, no STX INWK+32 \ AI, has an E.C.M.) DEX \ Set pitch counter to 0 (no pitch, roll only) STX INWK+30 \STX INWK+31 \ This instruction is commented out in the original \ source. It would set the exploding state and missile \ count to 0 STX FRIN+1 \ Set the second slot in the FRIN table to 0, so when we \ fall through into NWSHP below, the new station that \ gets created will go into slot FRIN+1, as this will be \ the first empty slot that the routine finds DEX \ Set the roll counter to 255 (maximum anti-clockwise STX INWK+29 \ roll with no damping) LDX #10 \ Call NwS1 to flip the sign of nosev_x_hi (byte #10) JSR NwS1 JSR NwS1 \ And again to flip the sign of nosev_y_hi (byte #12) JSR NwS1 \ And again to flip the sign of nosev_z_hi (byte #14) LDA #LO(LSO) \ Set bytes #33 and #34 to point to LSO for the ship STA INWK+33 \ line heap for the space station LDA #HI(LSO) STA INWK+34 LDA #SST \ Set A to the space station type, and fall through \ into NWSHP to finish adding the space station to the \ universe