System Flags of TI-OS
The TI86 has many flags (options) available. They are stored as bits either set (yes, on) or reset (no, off) in a designated area of memory. They start at the following equate:
_flags =$c3e5
Each "grouping" of like options are
stored in a byte. We reference those
groupings as "offsets" from the start
of the flags (_flags). According
to the chart below, the '_textflags' are
at offset $05 from '_flags'.
Most all the names used on this page
are equated
in
ti86asm.inc.
TI-OS likes to keep the iy
register always holding the address
of the start of the flags. That makes
it easier if it wants to check any
flag at any time. That is also
why we try not to mess with iy
in our program, so we don't change
the offset TI-OS assumes.
Here's an example of changing the text display option to print white text on a black background. This is done by setting that option's bit. The next line changes it back to the default black text on a white background.
set textinverse,(iy+textflags) ;white on black res textinverse,(iy+textflags) ;default black on white
Flag Offset Name Hex/Dec
| Name | Bit | Description |
trigflags $00/0
| trigdeg | 2 | 0 - Radians 1 - Degrees |
| doneprgm | 5 | 1 - Program running so print
"Done" when finished 0 - Program not running |
plotflags/grfmodeflags $02/2
| plotloc | 1 | 0 - Graph writes to display and backup buffer 1 - Graph writes do display only |
| plotdisp | 2 | 0 - Graph screen not currently displayed 1 - Graph screen being displayed now |
| grffuncm | 4 | 1 - Function Graph mode |
| grfpolarm | 5 | 1 - Polar Graph mode |
| grfparamm | 6 | 1 - Parametric Graph mode |
| grfrecurm | 7 | 1 - Differential Equation Graph mode |
graphflags $03/3
| graphdraw | 0 | 0 - Don't need to redraw graph before displaying 1 - Need to redraw graph |
| graphcursor | 2 | 0 - Graph cursor is not displayed 1 - Graph cursor currently displayed |
grfdbflags $04/4
| grfdot | 0 | 0 - Graph Line mode 1 - Graph Dot mode |
| grfsimul | 1 | 0 - Sequential Graph mode 1 - Simultaneous Graph mode |
| grfgrid | 2 | 0 - Show grid 1 - Hide grid |
| grfpolar | 3 | 0 - Rectangular coordinates 1 - Polar coordinates |
| grfnocoord | 4 | 0 - Show coordinates 1 - Hide coordinates |
| grfnoaxis | 5 | 0 - Show axis 1 - Hide axis |
| grflabel | 6 | 0 - Show labels 1 - Hide labels |
textflags $05/5
| texterasebelow | 1 | 1 - Erase line below variable width font |
| textscrolled | 2 | 1 - Screen was scrolled up after last printing |
| textinverse | 3 | 1 - Print white text on black background 0 - Print black text on white background |
apdflags $08/8
| apdable | 2 | 1 - APD on 0 - APD off |
| apdlock | 3 | 1 - APD locked 0 - APD unlocked |
| apdwarmstart | 4 | 1 - APD has expired |
onflags $09/9
| onrunning | 3 | 1 - TI86 is turned on currently |
| oninterrupt | 4 | 1 - [ON] interrupt occured |
fmtflags $0a/10
| fmtexponent | 0 | 1 - Exponential number format |
| fmteng | 1 | 1 - Engineering number format |
| fmthex | 2 | 1 - Hexadecimal mode |
| fmtoct | 3 | 1 - Octadecimal mode |
| fmtbin | 4 | 1 - Binary mode |
curflags $0c/12
| curable | 2 | 1 - Blinking cursor on |
| curon | 3 | 1 - Static cursor displayed |
| curlock | 4 | 1 - Cannot change cursor state |
| 6 | 0 - Has to do with _JForceCmdNoChar=$409c
|
appflags $0d/13
| apptextsave | 1 | 1 - Save characters on screen to _textShadow ($c0f9) |
| appautoscroll | 2 | 1 - Automatically scroll text if printing on bottom line |
indicflags $12/18
| indicrun | 0 | 1 - Animated Run Indicator |
| indiconly | 2 | 1 - Interrupts do not work with APD or cursor. They just animate run indicator |
| shift2nd | 3 | 1 - 2nd mode |
| shiftalpha | 4 | 1 - Alpha mode |
| shiftlwralph | 5 | 1 - Lowercase Alpha 0 - Uppercase Alpha |
| shiftalock | 6 | 1 - Locked in Alpha mode |
newgrfflags $18/24
| textwrite | 6 | 1 - Variable Width Font writes to Graph screen |
statflags $1d/29
| statsvalid | 6 | 1 - Statistics results can be used |
graphcursorflag $1e/30
| dispcursor | 2 | 1 - Show status of cursor (Alpha, alpha, 2nd, or regular) in upper right corner of screen. Useful for string input routines. |
altflags/userflags $23/35
| altfont | 0 | 1 - Use User Font for cursor font |
| altvfont | 1 | 1 - Use User Font for variable width font |
| altint | 2 | 1 - Use User Interrupt Routine |
| alton | 3 | 1 - Use User On Routine |
| altlink | 4 | 1 - Use User Link Routine |
| altoff | 7 | 1 - Use User Off Routine |
sqrtflags $24/36
| sqrtparse | 0 | 1 - Use SqrtParse Routine |
| sqrtform | 1 | 1 - Use SqrtExec Routine |
| sqrtexec | 2 | 1 - Use SqrtExec Routine |
| sqrtexpr | 3 | 1 - Use SqrtExpr Routine |
| sqrthome | 4 | 1 - Use SqrtHome Routine |
| sqrtcmdtok | 5 | 1 - Use SqrtCmdTok Routine |
| sqrtkey | 6 | 1 - Use SqrtKey Routine |
| sqrtgrf | 7 | 1 - Use SqrtGrf Routine |
More from z80 » Advanced
All The Ports // APD // Assembler Directives // Entry Stack // User Fonts // IM 1 // IM 2 // Index, Shadow, and Other Registers // User Interrupt // Morphic Code // On-Off // Reading Keypresses from Port // Shift and Rotate // Simulating Key Presses // Sound // Square-Root Programs // System Flags of TI-OS