Atari 400 Basic Reference Manual page 117

LABEL
RADFLG
LPENH
LPENV
TXTROW
TXTCOL
COLORO
COLOR1
COLOR2
COLOR3
COLOR4
MEMTOP
MEMLO
CRSINH
CHACT
CHBAS
ATACHR
CH
FILDAT
DSPFLG
SSFLAG
HATABS
IOCB
CONSOL
• Future product.
I-2
Appendix
DECIMAL
LOCATION
251
564
565
656
657,658
708
709
710
711
712
741,742
743,744
752
755
756
763
764
765
766
767
794
832
1664-1791
53279
HEXADECIMAL
LOCATION COMMENTS AND DESCRIPTIONS
FB RAD/DEG flag
(0
=radians, 6 =degrees).
234 Light Pen* Horizontal value.
235 Light Pen* Vertical value.
290 Cursor row (text window)
291,292 Cursor column (text window)
2C4 Color Register 0
2C5
Color Register 1
2C6 Color Register 2
2C7
Color Register 3
2C8 Color Register 4
2E5,2E6 OS top of available user memory pointer (LSB,
MSB)
2E7,2E8 OS low memory pointer
2FO Cursor inhibit (0 =cursor on, 1 =cursor off)
2F3 Character mode register (4 = vertical reflect; 2 =
normal; 1 =blank)
2F4 Character base register (defaults to 224) (224 = up-
per case, 226 = lower case characters)
2FB Last ATASCII character.
2FC Last keyboard key pressed; internal code; (255
clears character).
2FD Fill data for graphics Fill (XIO).
2FE Display Flag (1 = display control character).
2FF Start/Stop flag for paging (0 =normal listing) Set by
1£111.
31A Handler address table (3 bytes/handler)
340 I/0 control blocks (16 bytes!IOCB)
680-6FE
D01F
Spare RAM
Console switches (bit 2 = Option; bit 1 = Select; bit
0 = Start. POKE 53279, 0 before reading. 0 =
switch pressed.)