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Routines |
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Used by the routine at 31688.
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| 32065 | LD HL,6151 | Set left and right x-coordinates of region to scroll to 7 and 24 (characters) respectively... | ||
| 32068 | LD (23489),HL | ... | ||
| 32071 | LD HL,36416 | Set top and bottom y-coordinates of region to scroll to 64 and 142 (pixels) respectively... | ||
| 32074 | LD (23491),HL | ... | ||
| 32077 | LD DE,25877 | Point DE at end of temporary storage area (i.e. last pixel-row's data) | ||
| 32080 | LD B,24 | Load B with 24 (number of pixels to scroll viewscreen content down) | ||
| 32082 | PUSH BC | Store BC (B = remaining number of pixels to scroll viewscreen content down) | ||
| 32083 | PUSH DE | Store DE (address of current position in temporary storage area) | ||
| 32084 | HALT | Wait for two interrupts... | ||
| 32085 | HALT | ... | ||
| 32086 | CALL 55436 | Scroll a region of the display file down a pixel row without wrapping | ||
| 32089 | POP DE | Restore DE (address of current position in temporary storage area) | ||
| 32090 | PUSH DE | Store DE (address of current position in temporary storage area) | ||
| 32091 | LD HL,22055 | Point HL at 7th pixel row of character block at 7, 17 (left-most byte of bottom pixel row of viewscreen contents) | ||
| 32094 | LD BC,18 | Load B with 18 (as viewscreen contents are 18 characters wide) and C with zero | ||
| 32097 | LDIR | Copy bitmap data in bottom pixel row of viewscreen content to temporary storage area | ||
| 32099 | LD HL,20423 | Point HL at display file address for pixel row two above top of planet graphic (leftmost character in viewscreen content) | ||
| 32102 | LD DE,18439 | Point DE at display file address for top pixel row in viewscreen content (leftmost character block) | ||
| 32105 | LD BC,18 | Copy viewscreen content bitmap data from pixel row two above top of planet graphic to top pixel row in viewscreen content... | ||
| 32108 | LDIR | ... | ||
| 32110 | POP HL | Restore HL (address of current position in temporary storage area, was previously in DE) | ||
| 32111 | OR A | Reset carry flag | ||
| 32112 | LD BC,18 | Move HL back 18 bytes... | ||
| 32115 | SBC HL,BC | ... | ||
| 32117 | EX DE,HL | Swap DE (now points to current position in temporary storage area) and HL | ||
| 32118 | POP BC | Restore BC (B = remaining number of pixels to scroll viewscreen content down) | ||
| 32119 | DJNZ 32082 | Decrease remaining number of pixel rows to scroll viewscreen content down, and loop back to 32082 if not zero | ||
| 32121 | JP 35828 | Display acceleration / deceleration effect on USS Pisces viewscreen and return | ||
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