src/mame/video/m79amb.c
| r1901 | r1902 | |
|---|
| 1 | | /*************************************************************************** |
| 2 | | |
| 3 | | video.c |
| 4 | | |
| 5 | | Functions to emulate the video hardware of the machine. |
| 6 | | |
| 7 | | ***************************************************************************/ |
| 8 | | |
| 9 | | #include "driver.h" |
| 10 | | |
| 11 | | |
| 12 | | |
| 13 | | static UINT8 mask = 0; |
| 14 | | |
| 15 | | WRITE8_HANDLER( ramtek_mask_w ) |
| 16 | | { |
| 17 | | mask = data; |
| 18 | | } |
| 19 | | |
| 20 | | WRITE8_HANDLER( ramtek_videoram_w ) |
| 21 | | { |
| 22 | | data = data & ~mask; |
| 23 | | |
| 24 | | if (videoram[offset] != data) |
| 25 | | { |
| 26 | | int i,x,y; |
| 27 | | |
| 28 | | videoram[offset] = data; |
| 29 | | |
| 30 | | y = offset / 32; |
| 31 | | x = 8 * (offset % 32); |
| 32 | | |
| 33 | | for (i = 0; i < 8; i++) |
| 34 | | { |
| 35 | | pen_t pen = (data & 0x80) ? RGB_WHITE : RGB_BLACK; |
| 36 | | *BITMAP_ADDR32(tmpbitmap, y, x) = pen; |
| 37 | | |
| 38 | | x++; |
| 39 | | data <<= 1; |
| 40 | | } |
| 41 | | } |
| 42 | | } |