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78 lines
2.4 KiB
PHP
78 lines
2.4 KiB
PHP
;
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; Vic20 generic definitions. Stolen mostly from c64.inc - Steve Schmidtke
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;
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; ---------------------------------------------------------------------------
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; Zero page, Commodore stuff
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ST := $90 ; IEC status byte
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TIME := $A0 ; 60HZ clock
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FNAM_LEN := $B7 ; Length of filename
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SECADR := $B9 ; Secondary address
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DEVNUM := $BA ; Device number
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FNAM := $BB ; Pointer to filename
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KEY_COUNT := $C6 ; Number of keys in input buffer
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RVS := $C7 ; Reverse flag
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CURS_FLAG := $CC ; 1 = cursor off
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CURS_BLINK := $CD ; Blink counter
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CURS_CHAR := $CE ; Character under the cursor
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CURS_STATE := $CF ; Cursor blink state
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SCREEN_PTR := $D1 ; Pointer to current char in text screen
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CURS_X := $D3 ; Cursor column
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CURS_Y := $D6 ; Cursor row
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CRAM_PTR := $F3 ; Pointer to current char in color RAM
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BASIC_BUF := $200 ; Location of command-line
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BASIC_BUF_LEN = 89 ; Maximum length of command-line
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CHARCOLOR := $286
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CURS_COLOR := $287 ; Color under the cursor
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; ---------------------------------------------------------------------------
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; Screen size
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XSIZE = 22
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YSIZE = 23
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; ---------------------------------------------------------------------------
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; Kernal routines
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; Direct entries
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CLRSCR := $E55F
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KBDREAD := $E5CF
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; ---------------------------------------------------------------------------
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; Vector and other locations
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IRQVec := $0314
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BRKVec := $0316
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NMIVec := $0318
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; ---------------------------------------------------------------------------
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; I/O: 6560 VIC
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VIC := $9000
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VIC_LINES := $9003 ; Screen lines, bit 7 is bit 0 from VIC_HLINE
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VIC_HLINE := $9004 ; Rasterline, bits 1-8
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VIC_COLOR := $900F ; Border and background color
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; ---------------------------------------------------------------------------
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; I/O: 6522 VIA1
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VIA1 := $9110
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VIA1_JOY := $9111
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VIA1_DDRB := $9112
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VIA1_DDRA := $9113
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; ---------------------------------------------------------------------------
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; I/O: 6522 VIA2
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VIA2 := $9120
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VIA2_JOY := $9120
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VIA2_DDRB := $9122
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VIA2_DDRA := $9123
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