diff --git a/doc/atari.sgml b/doc/atari.sgml index a0dbe2f47..6cbff6208 100644 --- a/doc/atari.sgml +++ b/doc/atari.sgml @@ -317,6 +317,49 @@ chip registers.
+
+
+A major feature of the Atari graphics chip "ANTIC" is to
+process instructions for the display generation.
+cc65 supports constructing these display lists by offering defines
+for the instructions. In conjunction with the "void"-variable extension
+of cc65, display lists can be created quite comfortable:
+
+
diff --git a/include/_antic.h b/include/_antic.h
index ab0cd9664..23a72609c 100644
--- a/include/_antic.h
+++ b/include/_antic.h
@@ -57,42 +57,42 @@ struct __antic {
/* antic instruction set */
/* absolute instructions (non mode lines) */
-#define DL_JMP 1
-#define DL_JVB 65
+#define DL_JMP (unsigned char) 1
+#define DL_JVB (unsigned char) 65
-#define DL_BLK1 0
-#define DL_BLK2 16
-#define DL_BLK3 32
-#define DL_BLK4 48
-#define DL_BLK5 64
-#define DL_BLK6 80
-#define DL_BLK7 96
-#define DL_BLK8 112
+#define DL_BLK1 (unsigned char) 0
+#define DL_BLK2 (unsigned char) 16
+#define DL_BLK3 (unsigned char) 32
+#define DL_BLK4 (unsigned char) 48
+#define DL_BLK5 (unsigned char) 64
+#define DL_BLK6 (unsigned char) 80
+#define DL_BLK7 (unsigned char) 96
+#define DL_BLK8 (unsigned char) 112
/* absolute instructions (mode lines) */
-#define DL_CHR40x8x1 2 /* monochrome, 40 character & 8 scanlines per mode line (GR. 0) */
-#define DL_CHR40x10x1 3 /* monochrome, 40 character & 10 scanlines per mode line */
-#define DL_CHR40x8x4 4 /* colour, 40 character & 8 scanlines per mode line (GR. 12) */
-#define DL_CHR40x16x4 5 /* colour, 40 character & 16 scanlines per mode line (GR. 13) */
-#define DL_CHR20x8x2 6 /* colour (duochrome per character), 20 character & 8 scanlines per mode line (GR. 1) */
-#define DL_CHR20x16x2 7 /* colour (duochrome per character), 20 character & 16 scanlines per mode line (GR. 2) */
+#define DL_CHR40x8x1 (unsigned char) 2 /* monochrome, 40 character & 8 scanlines per mode line (GR. 0) */
+#define DL_CHR40x10x1 (unsigned char) 3 /* monochrome, 40 character & 10 scanlines per mode line */
+#define DL_CHR40x8x4 (unsigned char) 4 /* colour, 40 character & 8 scanlines per mode line (GR. 12) */
+#define DL_CHR40x16x4 (unsigned char) 5 /* colour, 40 character & 16 scanlines per mode line (GR. 13) */
+#define DL_CHR20x8x2 (unsigned char) 6 /* colour (duochrome per character), 20 character & 8 scanlines per mode line (GR. 1) */
+#define DL_CHR20x16x2 (unsigned char) 7 /* colour (duochrome per character), 20 character & 16 scanlines per mode line (GR. 2) */
-#define DL_MAP40x8x4 8 /* colour, 40 pixel & 8 scanlines per mode line (GR. 3) */
-#define DL_MAP80x4x2 9 /* 'duochrome', 80 pixel & 4 scanlines per mode line (GR.4) */
-#define DL_MAP80x4x4 10 /* colour, 80 pixel & 4 scanlines per mode line (GR.5) */
-#define DL_MAP160x2x2 11 /* 'duochrome', 160 pixel & 2 scanlines per mode line (GR.6) */
-#define DL_MAP160x1x2 12 /* 'duochrome', 160 pixel & 1 scanline per mode line (GR.14) */
-#define DL_MAP160x2x4 13 /* 4 colours, 160 pixel & 2 scanlines per mode line (GR.7) */
-#define DL_MAP160x1x4 14 /* 4 colours, 160 pixel & 1 scanline per mode line (GR.15) */
-#define DL_MAP320x1x1 15 /* monochrome, 320 pixel & 1 scanline per mode line (GR.8) */
+#define DL_MAP40x8x4 (unsigned char) 8 /* colour, 40 pixel & 8 scanlines per mode line (GR. 3) */
+#define DL_MAP80x4x2 (unsigned char) 9 /* 'duochrome', 80 pixel & 4 scanlines per mode line (GR.4) */
+#define DL_MAP80x4x4 (unsigned char) 10 /* colour, 80 pixel & 4 scanlines per mode line (GR.5) */
+#define DL_MAP160x2x2 (unsigned char) 11 /* 'duochrome', 160 pixel & 2 scanlines per mode line (GR.6) */
+#define DL_MAP160x1x2 (unsigned char) 12 /* 'duochrome', 160 pixel & 1 scanline per mode line (GR.14) */
+#define DL_MAP160x2x4 (unsigned char) 13 /* 4 colours, 160 pixel & 2 scanlines per mode line (GR.7) */
+#define DL_MAP160x1x4 (unsigned char) 14 /* 4 colours, 160 pixel & 1 scanline per mode line (GR.15) */
+#define DL_MAP320x1x1 (unsigned char) 15 /* monochrome, 320 pixel & 1 scanline per mode line (GR.8) */
/* modifiers on mode lines */
-#define DL_HSCROL 16
-#define DL_VSCROL 32
-#define DL_LMS 64
+#define DL_HSCROL(x) (unsigned char)((x) | 16)
+#define DL_VSCROL(x) (unsigned char)((x) | 32)
+#define DL_LMS(x) (unsigned char)((x) | 64)
/* general modifier */
-#define DL_DLI 128
+#define DL_DLI(x) (unsigned char)((x) | 128)
/* End of _antic.h */
#endif /* #ifndef __ANTIC_H */
diff --git a/testcode/lib/atari/displaylist.c b/testcode/lib/atari/displaylist.c
new file mode 100644
index 000000000..04c599878
--- /dev/null
+++ b/testcode/lib/atari/displaylist.c
@@ -0,0 +1,69 @@
+/*
+** testprogram for ANTIC instructions as defined in "_antic.h"
+**
+** 23-Feb-2017, Christian Krueger
+*/
+
+#include