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60 lines
1.9 KiB
PHP
60 lines
1.9 KiB
PHP
;
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; PET generic definitions.
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;
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; ---------------------------------------------------------------------------
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; Zero page, Commodore stuff
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VARTAB := $2A ; Pointer to start of BASIC variables
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MEMSIZE := $34 ; Size of memory installed
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TXTPTR := $77 ; Pointer into BASIC source code
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TIME := $8D ; 60HZ clock
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KEY_COUNT := $9E ; Number of keys in input buffer
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RVS := $9F ; Reverse flag
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CURS_FLAG := $A7 ; 1 = cursor off
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CURS_BLINK := $A8 ; Blink counter
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CURS_CHAR := $A9 ; Character under the cursor
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CURS_STATE := $AA ; Cursor blink state
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SCREEN_PTR := $C4 ; Pointer to current char in text screen
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CURS_X := $C6 ; Cursor column
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FNLEN := $D1 ; Length of filename
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LFN := $D2 ; Current Logical File Number
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SECADR := $D3 ; Secondary address
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DEVNUM := $D4 ; Device number
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SCR_LINELEN := $D5 ; Screen line length
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CURS_Y := $D8 ; Cursor row
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FNADR := $DA ; Pointer to file name
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BASIC_BUF := $200 ; Location of command-line
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BASIC_BUF_LEN = 81 ; Maximum length of command-line
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KEY_BUF := $26F ; Keyboard buffer
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;----------------------------------------------------------------------------
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; PET ROM type detection
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PET_DETECT := $FFFB
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PET_2000 = $CA
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PET_3000 = $FC
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PET_4000 = $FD
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;----------------------------------------------------------------------------
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; Vector and other locations
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IRQVec := $0090
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BRKVec := $0092
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NMIVec := $0094
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; ---------------------------------------------------------------------------
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; I/O: 6522 VIA2
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VIA := $E840
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VIA_PRB := $E840
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VIA_PRA := $E841
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VIA_DDRB := $E842
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VIA_DDRA := $E843
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