FNAM_BANK := $C7 ; Bank for filename
KEY_COUNT := $D0 ; Number of keys in input buffer
FKEY_COUNT := $D1 ; Characters for function key
-MODE := $D7 ; 40/80 column mode flag
+MODE := $D7 ; 40-/80-column mode (bit 7: 80 columns)
+GRAPHM := $D8 ; Graphics mode flags (bits 5-7)
+CHARDIS := $D9 ; Bit 2 shadow for location $01
CURS_X := $EC ; Cursor column
CURS_Y := $EB ; Cursor row
SCREEN_PTR := $E0 ; Pointer to current char in text screen
RVS := $F3 ; Reverse output flag
SCROLL := $F8 ; Disable scrolling flag
-BASIC_BUF := $200 ; Location of command-line
+BASIC_BUF := $0200 ; Location of command-line
BASIC_BUF_LEN = 162 ; Maximum length of command-line
-FETCH := $2A2 ; Fetch subroutine in RAM
-FETVEC := $2AA ; Vector patch location for FETCH
-STASH := $2AF ; Stash routine in RAM
-STAVEC := $2B9 ; Vector patch location for STASH
-IRQInd := $2FD ; JMP $0000 -- used as indirect IRQ vector
-PALFLAG := $A03 ; $FF=PAL, $00=NTSC
-INIT_STATUS := $A04 ; Flags: Reset/Restore initiation status
+FETCH := $02A2 ; Fetch subroutine in RAM
+FETVEC := $02AA ; Vector patch location for FETCH
+STASH := $02AF ; Stash routine in RAM
+STAVEC := $02B9 ; Vector patch location for STASH
+IRQInd := $02FD ; JMP $0000 -- used as indirect IRQ vector
+PALFLAG := $0A03 ; $FF=PAL, $00=NTSC
+INIT_STATUS := $0A04 ; Flags: Reset/Restore initiation status
+VM2 := $0A2D ; VIC-IIe shadow for $D018 -- graphics mode
FKEY_LEN := $1000 ; Function key lengths
FKEY_TEXT := $100A ; Function key texts
-KBDREPEAT := $28a
-KBDREPEATRATE := $28b
-KBDREPEATDELAY := $28c
-
-; ---------------------------------------------------------------------------
-; Kernal routines
-
-; Direct entries
-CURS_SET := $CD57
-CURS_ON := $CD6F
-CURS_OFF := $CD9F
-CLRSCR := $C142
-KBDREAD := $C006
-NEWLINE := $C363
-PRINT := $C322
-NMIEXIT := $FF33
-INDFET := $FF74
+KBDREPEAT := $028a
+KBDREPEATRATE := $028b
+KBDREPEATDELAY := $028c
; ---------------------------------------------------------------------------
; Vectors
; ---------------------------------------------------------------------------
; I/O: VDC (128 only)
-VDC_INDEX := $D600
-VDC_DATA := $D601
+VDC_INDEX := $D600 ; register address port
+VDC_DATA := $D601 ; data port
+
+; Registers
+VDC_DATA_HI = 18 ; video RAM address (big endian)
+VDC_DATA_LO = 19
+VDC_CSET = 28
+VDC_RAM_RW = 31 ; RAM port
; ---------------------------------------------------------------------------
; I/O: Complex Interface Adapters