diff options
| author | Alexey 'Cluster' Avdyukhin <clusterrr@clusterrr.com> | 2020-09-17 01:13:18 +0300 |
|---|---|---|
| committer | Alexey 'Cluster' Avdyukhin <clusterrr@clusterrr.com> | 2020-09-17 01:13:18 +0300 |
| commit | a95ef293d4c49ac8cc15f1e52000d6548c794990 (patch) | |
| tree | f9e5c15cb83101c01a58b000e235ae561692771e /preloader.asm | |
| parent | c1a0b52bc997859f7ba7f0fba0b76c9226ea1e95 (diff) | |
Refactoring
Diffstat (limited to 'preloader.asm')
| -rw-r--r-- | preloader.asm | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/preloader.asm b/preloader.asm new file mode 100644 index 0000000..32b7337 --- /dev/null +++ b/preloader.asm @@ -0,0 +1,135 @@ + ; starting game! +start_game: + sei ; no interrupts + + lda #%00000000 ; disable PPU + sta $2000 + lda #%00000000 + sta $2001 + + .if SECRETS>=3 + ; check for konami code + lda <KONAMI_CODE_STATE + cmp konami_code_length + bne .no_konami_code + lda games_count + clc + adc #2 + sta <SELECTED_GAME + lda games_count+1 + adc #0 + sta <SELECTED_GAME+1 +.no_konami_code: + .endif + + jsr waitblank_simple + lda #%00100000 ; four-screen + sta $5007 + jsr clear_screen ; clear NTRAM + lda #%00001011 ; mirroring, chr-write, enable sram + sta $5007 + jsr clear_screen ; clear nametables + jsr clear_sprites + jsr sprite_dma_copy + + lda SELECTED_GAME+1 + jsr select_bank + ldx SELECTED_GAME + lda loader_data_game_type, x + and CONSOLE_TYPE + beq compatible_console + + ; not compatible console! + ; save state, without game save + lda #0 + sta <LAST_STARTED_SAVE + jsr save_state + lda #$21 + sta $2006 + lda #$A0 + sta $2006 + ldy #0 +.incompatible_print_error: + ; text + lda incompatible_console_text, y + sta $2007 + iny + cmp #0 + bne .incompatible_print_error + lda #$23 + sta $2006 + lda #$C8 + sta $2006 + lda #$FF + ldy #$38 +.incompatible_print_error_palette: + sta $2007 + dey + bne .incompatible_print_error_palette + jsr waitblank_simple + bit $2002 + lda #0 + sta $2005 + sta $2005 + lda #%00001000 + sta $2000 + lda #%00001010 + sta $2001 + jsr waitblank_simple +.incompatible_print_wait_no_button: + jsr read_controller + lda <BUTTONS + bne .incompatible_print_wait_no_button +.incompatible_print_wait_button: + jsr read_controller + lda <BUTTONS + beq .incompatible_print_wait_button + jmp Start + +compatible_console: + ldx #15 +.start_game_wait_sound: + jsr waitblank_simple + dex + bne .start_game_wait_sound + + ; loading game settings + ldx SELECTED_GAME + lda loader_data_reg_0, x + sta LOADER_REG_0 + lda loader_data_reg_1, x + sta LOADER_REG_1 + lda loader_data_reg_2, x + sta LOADER_REG_2 + lda loader_data_reg_3, x + sta LOADER_REG_3 + lda loader_data_reg_4, x + sta LOADER_REG_4 + lda loader_data_reg_5, x + sta LOADER_REG_5 + lda loader_data_reg_6, x + sta LOADER_REG_6 + lda loader_data_reg_7, x + sta LOADER_REG_7 + lda loader_data_chr_start_bank_h, x + sta LOADER_CHR_START_H + lda loader_data_chr_start_bank_l, x + sta LOADER_CHR_START_L + lda loader_data_chr_start_bank_s, x + sta LOADER_CHR_START_S + lda loader_data_chr_count, x + sta LOADER_CHR_LEFT + lda #0 + sta LOADER_CHR_COUNT + lda loader_data_game_save, x + sta LOADER_GAME_SAVE + lda #2 + sta LOADER_GAME_SAVE_BANK + ; loading battery backed save if need + jsr load_save + lda LOADER_GAME_SAVE + sta LAST_STARTED_SAVE ; save ID of save + ; saving state + jsr save_state + + jmp loader |