Commodore 64 Manual de usuario Pagina 7
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- Tabla de contenidos
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
The ROM IMAGE in the above table refers to the character generator
ROM. It appears in place of RAM at the above locations in bank O. It
also appears in the corresponding RAM at locations 36864-40959
($9000-$9FFF) in bank 2. Since the VIC-II chip can only access 16K of
memory at a time, the ROM character patterns appear in the 16K block
of memory the VIC-II chip looks at. Therefore, the system was designed
to make the VIC-II chip think that the ROM characters are at 4096-8191
($1000-$1 FFF) when your data is in bank 0, and 36864-40959
($9000-$9FFF) when your data is in bank 2, even though the character
ROM is actually at location 53248-57343 ($DOOO-$DFFF). This imaging
only applies to character data as seen by the VIC-II chip. It can be used
for programs, other data, etc., just like any other RAM memory.
NOTE:
If these ROM images get in the way of your own graphics, then set the BANK
SELECT BITS to one of the BANKS without the images (BANKS 1 or 3). The ROM
patterns won't be there.
The location and contents of the character set in ROM are as follows:
Sharp-eyed readers will have just noticed something. The locations
occupied by the character ROM are the same as the ones occupied by
the VIC-II chip control registers. This is possible because they don't oc-
cupy the same locations at the same time. When the VIC-II chip needs to
PROGRAMMINGGRAPHICS 105
ADDRESS VIC-II
CONTENTS
BLOCK
DECIMAL HEX
IMAGE
0 53248 DOOO- D1FF
1000- 11FF
Upper case characters
53760 D200- D3FF
1200-13FF
Graphics characters
54272 D400- D5FF
1400-15FF
Reversed
upper case
characters
54784
D600- D7FF 1600- 17FF
Reversed
graphics
characters
1 55296
D800- D9FF 1800- 19FF Lower case characters
55808
DAOO- DBFF 1AOO- 1BFF
Upper case & graphics
characters
56320
DCOO- DDFF 1COO- 1DFF
Reversed lower
case
characters
56832
DEOO-DFFF 1EOO- 1FFF
Reversed upper case &
graphics characters
- GRAPHICS OVERVIEW 2
- GRAPHICS LOCATIONS 3
- SCREEN MEMORY 4
- COLOR MEMORY 5
- 104 PROGRAMMING GRAPHICS 6
- 1EOO- 1FFF 7
- (TURNS INTERRUPTS OFF) 8
- (TURNS INTERRUPTS ON) 8
- STANDARD CHARACTER MODE 9
- = SCREEN CODE*8+(CHARACTER 9
- PROGRAMMABLE CHARACTERS 10
- PROGRAMMINGGRAPHICS 109 11
- - PEEK(I): NEXT 12
- . . . making your 13
- 112 PROGRAMMING GRAPHICS 14
- PROGRAMMING GRAPHICS 113 15
- 10 REM* EXAMPLE1 * 16
- MULTI-COLOR MODE GRAPHICS 17
- BIT PATTERN 18
- II ";: REM LT.RED/ 20
- SET BACKGROUND 21
- COLOR #0 TO BLACK 21
- 120 PROGRAMMING GRAPHICS 22
- BIT MAPPED GRAPHICS 23
- HOW IT WORKS 24
- If you remember the 24
- CHARACTERSsection you will 24
- MAP AT 8192 25
- 124 PROGRAMMING GRAPHICS 26
- = Y AND 7 27
- = BASE+ ROW*320+ CHAR*8+ LINE 28
- MULTI-COLORBIT MAP MODE 29
- = 1/2 byte = 4 bits) 30
- PROGRAMMINGGRAPHICS 129 31
- PRItHII HELLOII; 32
- DEFINING A SPRITE 33
- "" 34
- POINTERS 35
- TURNING SPRITES ON 36
- TURNING SPRITES OFF 37
- MULTI-COLOR MODE 37
- SPRITETO MULTI-COLORMODE 38
- EXPANDED SPRITES 38
- POSITIONING 39
- POKEstatements: 40
- SET BEGINNING 41
- --- 229 ($E5) 42
- - - 54($36) 43
- ,ABI" 44
- = y < = 249 45
- COLLISION DETECTS 46
- SPRITE TO SPRITE COLLISIONS 47
- SPRITE TO DATA COLLISIONS 47
- 530 OOT0340 48
- SPRITE DATA ***** 48
- 'mil" 49
- =1THE~m>,;=- Dr.:: REt1 IF 50
- READA:REM READ IN A BYTE 51
- 485 POKEVIC+16,SIDE 51
- POSITImJ 51
- OTHER GRAPHICS FEATURES 52
- = stored raster count 53
- . = EXCELLENT 54
- SPRITES-ANOTHER LOOK 55
- AllDramE 55
- . . . but V+21 requires less 56
- PROGRAMMING GRAPHICS 155 57
- TV SCREEN 58
- =229 X =229, Y =231 I 59
- . . . POKEthe X POSI 61
- ...raI!tJ!n 62
- PROGRAMMING GRAPHICS 161 63
- DRAWING A SPRITE 64
- 4 2 6 842 1 8 4 2 6 842 1 64
- . . . STEP BY STEP 65
- 164 PROGRAMMING GRAPHICS 66
- POKEs the sprite 67
- VERTICAL SCROLLING 68
- ,,&lIB 69
- Emil' 70
- FORS 1 = 12288 71
- POKES1,Q1 71
- PROGRAMMINGGRAPHICS 169 71
- FORS2 =12352 72
- TO 12414 72
- B8 key and press the key 73
- - (0 times 256) or o. When 74
- PROGRAMMING GRAPHICS 173 75
- LINES100-109 76
- LINE 200: 77
- LINE 300: 77
- EASY SPR1TEMAKING CHART 78
- SPRITEMAKING NOTES 79
- SPRITE COLORS: 80
- MEMORY LOCATION: 80
- PROGRAMMING GRAPHICS 179 81
- I 8 I 4 I 2 I 1 I 82
- " 83
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