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cc65/asminc/pet.inc

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;
; PET generic definitions.
;
; ---------------------------------------------------------------------------
; Zero page, Commodore stuff
MEMSIZE := $34 ; Size of memory installed
TIME := $8D ; 60HZ clock
ST := $96 ; IEC status byte
KEY_COUNT := $9E ; Number of keys in input buffer
RVS := $9F ; Reverse flag
CURS_FLAG := $A7 ; 1 = cursor off
CURS_BLINK := $A8 ; Blink counter
CURS_CHAR := $A9 ; Character under the cursor
CURS_STATE := $AA ; Cursor blink state
SCREEN_PTR := $C4 ; Pointer to current char in text screen
CURS_X := $C6 ; Cursor column
FNLEN := $D1 ; Length of filename
LFN := $D2 ; Current Logical File Number
SECADR := $D3 ; Secondary address
DEVNUM := $D4 ; Device number
SCR_LINELEN := $D5 ; Screen line length
CURS_Y := $D8 ; Cursor row
FNADR := $DA ; Pointer to file name
KEY_BUF := $26F ; Keyboard buffer
;----------------------------------------------------------------------------
; PET ROM type detection
PET_DETECT := $FFFB
PET_2000 = $CA
PET_3000 = $FC
PET_4000 = $FD
;----------------------------------------------------------------------------
; Vector and other locations
IRQVec := $0090
BRKVec := $0092
NMIVec := $0094
; ---------------------------------------------------------------------------
; I/O: 6522 VIA2
VIA := $E840
VIA_PRB := $E840
VIA_PRA := $E841
VIA_DDRB := $E842
VIA_DDRA := $E843