1 #include "vdp.h"

2

3 void vdp_init(void)

4 {

5 int i;

6

7 vdp_setreg(VDP_REG_MODE1, VDP_MODE1_BASE);

8 vdp_setreg(VDP_REG_MODE2, VDP_MODE2_BASE | VDP_MODE2_DISP);

9

10 vdp_set_nametab_addr(VDP_PLANE_A, 0xc000);

11 vdp_set_nametab_addr(VDP_PLANE_B, 0xe000);

12 vdp_disable_layer(VDP_PLANE_WIN);

13 vdp_set_scroll_table(0xd000);

14 vdp_set_sprite_table(0xd400);

15

16 vdp_setreg(VDP_REG_MODE3, VDP_MODE3_BASE);

17 vdp_setreg(VDP_REG_MODE4, VDP_MODE4_BASE | VDP_MODE4_H40CELL);

18 vdp_setreg(VDP_REG_SCROLL_SIZE, VDP_SCROLL_H64 | VDP_SCROLL_V32);

19

20 vdp_set_autoinc(2);

21 vdp_set_bgcolor(0, 0);

22

23 vdp_setreg(VDP_REG_HINTR, 0);

24 vdp_setreg(VDP_REG_WIN_XPOS, 0);

25 vdp_setreg(VDP_REG_WIN_YPOS, 0);

26

27 /* clear vmem at the planes A/B name tables, scroll table, and sprite table */

28 vdp_setup_access(0xd000, VDP_MEM_WRITE, VDP_MEM_VRAM);

29 for(i=0xd000; i<65536; i++) {

30 VDP_PORT_DATA = 0;

31 }

32 }