A TempleOS distro for heretics
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$WW,1$$FG,5$$TX+CX,"Char Overview"$$FG$
A $FG,2$Char$FG$acter is a single byte holding an ASCII code for a letter, num or sym. The $FG,2$TempleOS$FG$ term is a $FG,2$U8$FG$.
Standard ASCII values range from 0 to 127. Values below 32 are ctrl key's. So, an ASCII #3 is a $FG,2$<CTRL-c>$FG$. TempleOS uses a few nonstandard values below 32. See $LK,"Char Definitions",A="MN:CH_SHIFT_SPACE"$.
ASCII #5 is the cursor location in a saved file.
ASCII #28 is $FG,2$<SHIFT-ESC>$FG$.
ASCII #31 is a $FG,2$<SHIFT-SPACE>$FG$.
TempleOS ASCII is 8-bit instead of 7-bit, so it also uses the range from 128-255. Press $FG,2$<CTRL-ALT-a>$FG$ to see shapes for 128-255. Technically, $FG,2$<CTRL-ALT-a>$FG$ are $LK,"scrn codes",A="HI:TextBase Layer"$.
A $FG,2$Key$FG$ is typically specified with a scan code. TempleOS scan codes contain the key value in the lowest $FG,2$U8$FG$, and flags in the upper 3 bytes. See $LK,"Scan Code Flags",A="MN:SCF_CTRL"$ and $LK,"Scan Codes",A="MN:SC_INS"$.
TempleOS stores scan codes in 8 bytes.
$FG,2$Byte 0$FG$ is the code. NumPad keys, SHIFT, ALT, CTRL and GUI keys combined.
$FG,2$Byte 1-3$FG$ are $LK,"flags",A="MN:SCf_KEY_UP"$
The upper 4-bytes are copied from lower 4-bytes.
$FG,2$Byte 4$FG$ is the code. Left, Right and NumPad keys distinct.
$FG,2$Byte 5-7$FG$ are $LK,"flags",A="MN:SCf_KEY_UP"$
Run the program $LK,"::/Demo/MsgLoop.HC"$ to examine scan code. Press $FG,2$<CTRL-SHIFT-l>$FG$ and "Insert ASCII/ScanCode".$FG$
See $LK,"Key Allocations",A="FI:::/Doc/KeyAlloc.DD"$ and $LK,"CKbdStateGlbls",A="MN:CKbdStateGlbls"$.
A $FG,2$String$FG$ is a bunch of ASCII characters terminated with a zero.