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vidhrdw
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skullxbo.c
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2000-04-04
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/***************************************************************************
vidhrdw/skullxbo.c
Functions to emulate the video hardware of the machine.
****************************************************************************
Playfield encoding
------------------
1 16-bit word is used
Word 1:
Bit 15 = horizontal flip
Bits 11-14 = palette
Bits 0-12 = image index
Motion Object encoding
----------------------
4 16-bit words are used
Word 1:
Bit 15 = horizontal flip
Bits 0-14 = image index
Word 2:
Bits 7-15 = Y position
Bits 0-3 = height in tiles (ranges from 1-16)
Word 3:
Bits 3-10 = link to the next image to display
Word 4:
Bits 6-14 = X position
Bit 4 = use current X position + 16 for next sprite
Bits 0-3 = palette
Alpha layer encoding
--------------------
1 16-bit word is used
Word 1:
Bit 15 = horizontal flip
Bit 12-14 = palette
Bits 0-11 = image index
***************************************************************************/
#include "driver.h"
#include "machine/atarigen.h"
#include "vidhrdw/generic.h"
#define XCHARS 42
#define YCHARS 30
#define XDIM (XCHARS*16)
#define YDIM (YCHARS*8)
#define DEBUG_VIDEO 0
/*************************************
*
* Structures
*
*************************************/
struct pf_overrender_data
{
struct osd_bitmap *bitmap;
int mo_priority;
};
/*************************************
*
* Statics
*
*************************************/
static struct atarigen_pf_state pf_state;
static UINT16 *scroll_list;
static UINT8 latch_byte;
static UINT16 mo_bank;
#if DEBUG_VIDEO
static UINT8 show_colors;
#endif
/*************************************
*
* Prototypes
*
*************************************/
static const UINT8 *update_palette(void);
static void pf_color_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *data);
static void pf_render_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *data);
static void pf_check_overrender_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *data);
static void pf_overrender_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *data);
static void mo_color_callback(const UINT16 *data, const struct rectangle *clip, void *param);
static void mo_render_callback(const UINT16 *data, const struct rectangle *clip, void *param);
#if DEBUG_VIDEO
static int debug(void);
#endif
/*************************************
*
* Video system start
*
*************************************/
int skullxbo_vh_start(void)
{
static struct atarigen_mo_desc mo_desc =
{
256, /* maximum number of MO's */
8, /* number of bytes per MO entry */
2, /* number of bytes between MO words */
0, /* ignore an entry if this word == 0xffff */
0, 0, 0xff, /* link = (data[linkword] >> linkshift) & linkmask */
0 /* reverse order */
};
static struct atarigen_pf_desc pf_desc =
{
16, 8, /* width/height of each tile */
64, 64 /* number of tiles in each direction */
};
/* reset statics */
memset(&pf_state, 0, sizeof(pf_state));
latch_byte = 0;
mo_bank = 0;
/* allocate the scroll list */
scroll_list = malloc(sizeof(UINT16) * 2 * YDIM);
if (!scroll_list)
return 1;
/* initialize the playfield */
if (atarigen_pf_init(&pf_desc))
{
free(scroll_list);
return 1;
}
/* initialize the motion objects */
if (atarigen_mo_init(&mo_desc))
{
free(scroll_list);
atarigen_pf_free();
return 1;
}
return 0;
}
/*************************************
*
* Video system shutdown
*
*************************************/
void skullxbo_vh_stop(void)
{
if (scroll_list)
free(scroll_list);
scroll_list = NULL;
atarigen_pf_free();
atarigen_mo_free();
}
/*************************************
*
* Video data latch
*
*************************************/
WRITE_HANDLER( skullxbo_hscroll_w )
{
/* update the playfield state */
pf_state.hscroll = (data >> 7) << 1;
atarigen_pf_update(&pf_state, cpu_getscanline());
}
WRITE_HANDLER( skullxbo_vscroll_w )
{
/* adjust for the scanline we're currently on */
int scanline = cpu_getscanline();
if (scanline >= YDIM) scanline -= YDIM;
/* update the playfield state */
pf_state.vscroll = ((data >> 7) - scanline) & 0x1ff;
atarigen_pf_update(&pf_state, scanline);
}
/*************************************
*
* Motion object bank handler
*
*************************************/
WRITE_HANDLER( skullxbo_mobmsb_w )
{
mo_bank = (offset & 0x400) * 2;
}
/*************************************
*
* Playfield latch write handler
*
*************************************/
WRITE_HANDLER( skullxbo_playfieldlatch_w )
{
latch_byte = data & 0xff;
}
/*************************************
*
* Playfield RAM write handler
*
*************************************/
WRITE_HANDLER( skullxbo_playfieldram_w )
{
int oldword = READ_WORD(&atarigen_playfieldram[offset]);
int newword = COMBINE_WORD(oldword, data);
/* only update if changed */
if (oldword != newword)
{
WRITE_WORD(&atarigen_playfieldram[offset], newword);
atarigen_pf_dirty[(offset & 0x1fff) / 2] = 0xff;
}
/* if we're writing the low byte, also write the upper */
if (offset < 0x2000)
skullxbo_playfieldram_w(offset + 0x2000, latch_byte);
}
/*************************************
*
* Periodic playfield updater
*
*************************************/
void skullxbo_scanline_update(int scanline)
{
UINT16 *base = (UINT16 *)&atarigen_alpharam[((scanline / 8) * 64 + XCHARS) * 2];
int x;
/* keep in range */
if ((UINT8 *)base >= &atarigen_alpharam[atarigen_alpharam_size])
return;
/* update the MOs from the SLIP table */
atarigen_mo_update_slip_512(&atarigen_spriteram[mo_bank], pf_state.vscroll, scanline, &atarigen_alpharam[0xf80]);
/* update the current parameters */
for (x = XCHARS; x < 64; x++)
{
UINT16 data = *base++;
UINT16 command = data & 0x000f;
if (command == 0x0d)
{
/* a new vscroll latches the offset into a counter; we must adjust for this */
int offset = scanline;
if (offset >= YDIM) offset -= YDIM;
pf_state.vscroll = ((data >> 7) - offset) & 0x1ff;
atarigen_pf_update(&pf_state, scanline);
}
}
}
/*************************************
*
* Main refresh
*
*************************************/
void skullxbo_vh_screenrefresh(struct osd_bitmap *bitmap, int full_refresh)
{
int i;
#if DEBUG_VIDEO
debug();
#endif
/* update the palette, and mark things dirty */
if (update_palette())
memset(atarigen_pf_dirty, 0xff, atarigen_playfieldram_size / 4);
/* set up the all-transparent overrender palette */
for (i = 0; i < 32; i++)
atarigen_overrender_colortable[i] = palette_transparent_pen;
/* draw the playfield */
memset(atarigen_pf_visit, 0, 64*64);
atarigen_pf_process(pf_render_callback, bitmap, &Machine->drv->visible_area);
/* draw the motion objects */
atarigen_mo_process(mo_render_callback, bitmap);
/* draw the alphanumerics */
{
const struct GfxElement *gfx = Machine->gfx[2];
int x, y, offs;
for (y = 0; y < YCHARS; y++)
for (x = 0, offs = y * 64; x < XCHARS; x++, offs++)
{
int data = READ_WORD(&atarigen_alpharam[offs * 2]);
int code = (data & 0x7ff) ^ 0x400;
int opaque = data & 0x8000;
int color = (data >> 11) & 15;
drawgfx(bitmap, gfx, code, color, 0, 0, 16 * x, 8 * y, 0, opaque ? TRANSPARENCY_NONE : TRANSPARENCY_PEN, 0);
}
}
/* update onscreen messages */
atarigen_update_messages();
}
/*************************************
*
* Palette management
*
*************************************/
static const UINT8 *update_palette(void)
{
UINT16 pf_map[16], al_map[16];
UINT32 mo_map[16];
const unsigned int *usage;
int i, j, x, y, offs;
/* reset color tracking */
memset(mo_map, 0, sizeof(mo_map));
memset(pf_map, 0, sizeof(pf_map));
memset(al_map, 0, sizeof(al_map));
palette_init_used_colors();
/* update color usage for the playfield */
atarigen_pf_process(pf_color_callback, pf_map, &Machine->drv->visible_area);
/* update color usage for the mo's */
atarigen_mo_process(mo_color_callback, mo_map);
/* update color usage for the alphanumerics */
usage = Machine->gfx[2]->pen_usage;
for (y = 0; y < YCHARS; y++)
for (x = 0, offs = y * 64; x < XCHARS; x++, offs++)
{
int data = READ_WORD(&atarigen_alpharam[offs * 2]);
int code = (data & 0x7ff) ^ 0x400;
int color = (data >> 11) & 15;
al_map[color] |= usage[code];
}
/* rebuild the playfield palette */
for (i = 0; i < 16; i++)
{
UINT16 used = pf_map[i];
if (used)
for (j = 0; j < 16; j++)
if (used & (1 << j))
palette_used_colors[0x200 + i * 16 + j] = PALETTE_COLOR_USED;
}
/* rebuild the motion object palette */
for (i = 0; i < 16; i++)
{
UINT32 used = mo_map[i];
if (used)
{
palette_used_colors[0x000 + i * 32 + 0] = PALETTE_COLOR_TRANSPARENT;
for (j = 1; j < 32; j++)
if (used & (1 << j))
palette_used_colors[0x000 + i * 32 + j] = PALETTE_COLOR_USED;
}
}
/* rebuild the alphanumerics palette */
for (i = 0; i < 16; i++)
{
UINT16 used = al_map[i];
if (used)
for (j = 0; j < 4; j++)
if (used & (1 << j))
palette_used_colors[0x300 + i * 4 + j] = PALETTE_COLOR_USED;
}
/* recalc */
return palette_recalc();
}
/*************************************
*
* Playfield palette
*
*************************************/
static void pf_color_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
const unsigned int *usage = Machine->gfx[1]->pen_usage;
UINT16 *colormap = (UINT16 *)param;
int x, y;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = x * 64 + y;
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int data2 = READ_WORD(&atarigen_playfieldram[0x2000 + offs * 2]);
int code = data & 0x7fff;
int color = data2 & 15;
colormap[color] |= usage[code];
/* also mark unvisited tiles dirty */
if (!atarigen_pf_visit[offs]) atarigen_pf_dirty[offs] = 0xff;
}
}
/*************************************
*
* Playfield rendering
*
*************************************/
static void pf_render_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
const struct GfxElement *gfx = Machine->gfx[1];
struct osd_bitmap *bitmap = param;
int x, y;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = x * 64 + y;
int data2 = READ_WORD(&atarigen_playfieldram[0x2000 + offs * 2]);
int color = data2 & 15;
if (atarigen_pf_dirty[offs] != color)
{
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int code = data & 0x7fff;
int hflip = data & 0x8000;
drawgfx(atarigen_pf_bitmap, gfx, code, color, hflip, 0, 16 * x, 8 * y, 0, TRANSPARENCY_NONE, 0);
atarigen_pf_dirty[offs] = color;
#if DEBUG_VIDEO
if (show_colors)
{
drawgfx(atarigen_pf_bitmap, Machine->uifont, "0123456789ABCDEF"[color], 1, 0, 0, 16 * x + 4, 8 * y, 0, TRANSPARENCY_PEN, 0);
drawgfx(atarigen_pf_bitmap, Machine->uifont, "0123456789ABCDEF"[color], 1, 0, 0, 16 * x + 6, 8 * y, 0, TRANSPARENCY_PEN, 0);
drawgfx(atarigen_pf_bitmap, Machine->uifont, "0123456789ABCDEF"[color], 0, 0, 0, 16 * x + 5, 8 * y, 0, TRANSPARENCY_PEN, 0);
}
#endif
}
/* track the tiles we've visited */
atarigen_pf_visit[offs] = 1;
}
/* then blast the result */
x = -state->hscroll;
y = -state->vscroll;
copyscrollbitmap(bitmap, atarigen_pf_bitmap, 1, &x, 1, &y, clip, TRANSPARENCY_NONE, 0);
/* also fill in the scroll list */
for (y = clip->min_y; y <= clip->max_y; y++)
if (y >= 0 && y < YDIM)
{
scroll_list[y * 2 + 0] = state->hscroll;
scroll_list[y * 2 + 1] = state->vscroll;
}
}
/*************************************
*
* Playfield overrender check
*
*************************************/
static const UINT16 overrender_matrix[4] =
{
0xf000,
0xff00,
0x0ff0,
0x00f0
};
static void pf_check_overrender_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
const unsigned int *usage = Machine->gfx[1]->pen_usage;
struct pf_overrender_data *overrender_data = param;
int mo_priority = overrender_data->mo_priority;
int x, y;
/* bail if we've already decided */
if (mo_priority == -1)
return;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = x * 64 + y;
int data2 = READ_WORD(&atarigen_playfieldram[0x2000 + offs * 2]);
int color = data2 & 15;
if (overrender_matrix[mo_priority] & (1 << color))
{
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int code = data & 0x7fff;
if (usage[code] & 0xff00)
{
overrender_data->mo_priority = -1;
return;
}
}
}
}
/*************************************
*
* Playfield overrendering
*
*************************************/
static void pf_overrender_callback(const struct rectangle *clip, const struct rectangle *tiles, const struct atarigen_pf_state *state, void *param)
{
const struct pf_overrender_data *overrender_data = param;
struct osd_bitmap *bitmap = overrender_data->bitmap;
int mo_priority = overrender_data->mo_priority;
const struct GfxElement *gfx = Machine->gfx[1];
int x, y;
/* standard loop over tiles */
for (x = tiles->min_x; x != tiles->max_x; x = (x + 1) & 63)
{
int sx = (16 * x - state->hscroll) & 0x3ff;
if (sx >= XDIM) sx -= 0x400;
for (y = tiles->min_y; y != tiles->max_y; y = (y + 1) & 63)
{
int offs = x * 64 + y;
int data2 = READ_WORD(&atarigen_playfieldram[0x2000 + offs * 2]);
int color = data2 & 15;
int sy = (8 * y - state->vscroll) & 0x1ff;
if (sy >= YDIM) sy -= 0x200;
if (overrender_matrix[mo_priority] & (1 << color))
{
int data = READ_WORD(&atarigen_playfieldram[offs * 2]);
int code = data & 0x7fff;
int hflip = data & 0x8000;
drawgfx(bitmap, gfx, code, color, hflip, 0, sx, sy, 0, TRANSPARENCY_PENS, 0x00ff);
}
}
}
}
/*************************************
*
* Motion object palette
*
*************************************/
static void mo_color_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
const unsigned int *usage = Machine->gfx[0]->pen_usage;
UINT32 *colormap = param;
int code = data[1] & 0x7fff;
int color = data[2] & 0x000f;
int hsize = ((data[3] >> 4) & 7) + 1;
int vsize = (data[3] & 15) + 1;
int tiles = hsize * vsize;
UINT32 temp = 0;
int i;
for (i = 0; i < tiles; i++)
temp |= usage[code++];
colormap[color] |= temp;
}
/*************************************
*
* Motion object rendering
*
*************************************/
static void mo_render_callback(const UINT16 *data, const struct rectangle *clip, void *param)
{
struct GfxElement *gfx = Machine->gfx[0];
struct pf_overrender_data overrender_data;
struct osd_bitmap *bitmap = param;
struct rectangle pf_clip;
/* determine the scroll offsets */
int scroll_scanline = (clip->min_y < 0) ? 0 : (clip->min_y > YDIM) ? YDIM : clip->min_y;
int xscroll = scroll_list[scroll_scanline * 2 + 0];
int yscroll = scroll_list[scroll_scanline * 2 + 1];
/* extract data from the various words */
int code = data[1] & 0x7fff;
int hflip = data[1] & 0x8000;
int xpos = ((data[2] >> 7) << 1) - xscroll;
int color = data[2] & 0x000f;
int hsize = ((data[3] >> 4) & 7) + 1;
int vsize = (data[3] & 15) + 1;
int ypos = -(data[3] >> 7) - yscroll;
int priority = (data[2] >> 4) & 3;
/* adjust for height */
ypos -= vsize * 8;
/* adjust the final coordinates */
xpos &= 0x3ff;
ypos &= 0x1ff;
if (xpos >= XDIM) xpos -= 0x400;
if (ypos >= YDIM) ypos -= 0x200;
/* determine the bounding box */
atarigen_mo_compute_clip_16x8(pf_clip, xpos, ypos, hsize, vsize, clip);
/* see if we're going to need to overrender */
overrender_data.mo_priority = priority;
atarigen_pf_process(pf_check_overrender_callback, &overrender_data, &pf_clip);
/* simple case? */
if (overrender_data.mo_priority == priority)
{
/* just draw -- we have dominion over all */
atarigen_mo_draw_16x8(bitmap, gfx, code, color, hflip, 0, xpos, ypos, hsize, vsize, clip, TRANSPARENCY_PEN, 0);
}
/* otherwise, it gets a smidge trickier */
else
{
/* draw an instance of the object in all transparent pens */
atarigen_mo_draw_transparent_16x8(bitmap, gfx, code, hflip, 0, xpos, ypos, hsize, vsize, clip, TRANSPARENCY_PEN, 0);
/* and then draw it normally on the temp bitmap */
atarigen_mo_draw_16x8(atarigen_pf_overrender_bitmap, gfx, code, color, hflip, 0, xpos, ypos, hsize, vsize, clip, TRANSPARENCY_NONE, 0);
/* overrender the playfield on top of that that */
overrender_data.mo_priority = priority;
overrender_data.bitmap = atarigen_pf_overrender_bitmap;
atarigen_pf_process(pf_overrender_callback, &overrender_data, &pf_clip);
/* finally, copy this chunk to the real bitmap */
copybitmap(bitmap, atarigen_pf_overrender_bitmap, 0, 0, 0, 0, &pf_clip, TRANSPARENCY_THROUGH, palette_transparent_pen);
}
#if DEBUG_VIDEO
if (show_colors)
{
int tx = (pf_clip.min_x + pf_clip.max_x) / 2 - 3;
int ty = (pf_clip.min_y + pf_clip.max_y) / 2 - 4;
drawgfx(bitmap, Machine->uifont, ' ', 0, 0, 0, tx - 2, ty - 2, 0, TRANSPARENCY_NONE, 0);
drawgfx(bitmap, Machine->uifont, ' ', 0, 0, 0, tx + 2, ty - 2, 0, TRANSPARENCY_NONE, 0);
drawgfx(bitmap, Machine->uifont, ' ', 0, 0, 0, tx - 2, ty + 2, 0, TRANSPARENCY_NONE, 0);
drawgfx(bitmap, Machine->uifont, ' ', 0, 0, 0, tx + 2, ty + 2, 0, TRANSPARENCY_NONE, 0);
drawgfx(bitmap, Machine->uifont, "0123456789ABCDEF"[priority], 0, 0, 0, tx, ty, 0, TRANSPARENCY_NONE, 0);
}
#endif
}
/*************************************
*
* Debugging
*
*************************************/
#if DEBUG_VIDEO
static void mo_print(struct osd_bitmap *bitmap, struct rectangle *clip, UINT16 *data, void *param)
{
int code = data[1] & 0x7fff;
int hsize = ((data[3] >> 4) & 7) + 1;
int vsize = (data[3] & 15) + 1;
int xpos = (data[2] >> 7);
int ypos = (data[3] >> 7);
int color = data[2] & 15;
int hflip = data[1] & 0x8000;
int priority = (data[2] >> 4) & 3;
FILE *f = (FILE *)param;
fprintf(f, "P=%04X X=%03X Y=%03X SIZE=%Xx%X COL=%X FLIP=%X PRI=%X -- DATA=%04X %04X %04X %04X\n",
code, xpos, ypos, hsize, vsize, color, hflip >> 15, priority, data[0], data[1], data[2], data[3]);
}
static int debug(void)
{
int hidebank = 0;
int new_show_colors;
new_show_colors = keyboard_pressed(KEYCODE_CAPSLOCK);
if (new_show_colors != show_colors)
{
show_colors = new_show_colors;
memset(atarigen_pf_dirty, 0xff, atarigen_playfieldram_size / 4);
}
if (keyboard_pressed(KEYCODE_Q)) hidebank = 0;
if (keyboard_pressed(KEYCODE_W)) hidebank = 1;
if (keyboard_pressed(KEYCODE_E)) hidebank = 2;
if (keyboard_pressed(KEYCODE_R)) hidebank = 3;
if (keyboard_pressed(KEYCODE_T)) hidebank = 4;
if (keyboard_pressed(KEYCODE_Y)) hidebank = 5;
if (keyboard_pressed(KEYCODE_U)) hidebank = 6;
if (keyboard_pressed(KEYCODE_I)) hidebank = 7;
if (keyboard_pressed(KEYCODE_A)) hidebank = 8;
if (keyboard_pressed(KEYCODE_S)) hidebank = 9;
if (keyboard_pressed(KEYCODE_D)) hidebank = 10;
if (keyboard_pressed(KEYCODE_F)) hidebank = 11;
if (keyboard_pressed(KEYCODE_G)) hidebank = 12;
if (keyboard_pressed(KEYCODE_H)) hidebank = 13;
if (keyboard_pressed(KEYCODE_J)) hidebank = 14;
if (keyboard_pressed(KEYCODE_K)) hidebank = 15;
if (keyboard_pressed(KEYCODE_9))
{
static int count;
char name[50];
FILE *f;
int i;
while (keyboard_pressed(KEYCODE_9)) { }
sprintf(name, "Dump %d", ++count);
f = fopen(name, "wt");
fprintf(f, "\n\nPalette RAM:\n");
for (i = 0x000; i < 0x800; i++)
{
fprintf(f, "%04X ", READ_WORD(&paletteram[i*2]));
if ((i & 15) == 15) fprintf(f, "\n");
if ((i & 255) == 255) fprintf(f, "\n");
}
fprintf(f, "\n\nMotion Objects (drawn)\n");
/* atarigen_mo_process(mo_print, f);*/
fprintf(f, "\n\nMotion Objects\n");
for (i = 0; i < 0x200; i++)
{
fprintf(f, " Object %02X: P=%04X Y=%04X L=%04X X=%04X\n",
i,
READ_WORD(&atarigen_spriteram[i*8+0]),
READ_WORD(&atarigen_spriteram[i*8+2]),
READ_WORD(&atarigen_spriteram[i*8+4]),
READ_WORD(&atarigen_spriteram[i*8+6])
);
}
fprintf(f, "\n\nPlayfield dump\n");
for (i = 0; i < atarigen_playfieldram_size / 4; i++)
{
fprintf(f, "%01X%04X ", READ_WORD(&atarigen_playfieldram[0x2000 + i*2]), READ_WORD(&atarigen_playfieldram[i*2]));
if ((i & 63) == 63) fprintf(f, "\n");
}
fprintf(f, "\n\nAlpha dump\n");
for (i = 0; i < atarigen_alpharam_size / 2; i++)
{
fprintf(f, "%04X ", READ_WORD(&atarigen_alpharam[i*2]));
if ((i & 63) == 63) fprintf(f, "\n");
}
fclose(f);
}
return hidebank;
}
#endif