kit-32 wip

  |FEDCBA9876543210|FEDCBA98-76543210|
  /----------------------------------\
  |IIIIIIIIIIIIIIII|DDDDSSSS-NTTOOOOO|
  \----------------------------------/
  I: if applicable, and T < 2, operand will be stored here
     instead of in the next word (32-bits)
  D: destination; 13 = stack ptr, 14 = imm, 15 = mem
  S: source;      13 = stack ptr, 14 = imm, 15 = mem
  N: 'data is signed?'
  T: data type; 0,1,2,3 = char,short,int,float
  O: operation type
  (D and S cannot be the same value)





brk: ?
sys: system call
mov: move data
sld: load from stack offset
sst: store to stack offset
sph: push to stack
spl: pull from stack
jmp: unconditional jump
cmp: compare data

inc: ++D (does not alter carry at all)
dec: --D (does not alter carry at all)
add: D += S (automatically sets carry)
sub: D -= S (automatically unsets carry)
mul: D *= S
neg: D = -D
i2f: int-to-float cast
f2i: float-to-int cast

ior: inclusive or
xor: exclusive or
and: bitwise and
shl: shift left
shr: shift right
???
ror: rotate right

bcc: branch on !carry
bcs: branch on  carry
bnc: branch on !negative
bns: branch on  negative
bzc: branch on !zero (AKA bne, !=)
bzs: branch on  zero (AKA beq, ==)
clc: clear carry flag
sec: set carry flag





comparisons:
  un/signed !=: !zero
  un/signed ==:  zero

  unsigned < : !carry
  unsigned > : !zero && carry
  unsigned <=: !carry || zero
  unsigned >=: carry

  signed < : negative
  signed > : !zero && !negative
  signed <=: negative || zero
  signed >=: !negative

keyboard input should be:
  low byte is the character, high byte are the key modifiers

sys calls:
  cpuid (check for floats, trig functions, interrupts,
         make and model, self-modifiable code, etc.)
  trig functions
  draw point(s)
  draw box(es)
  bcd conversions (for floats too)
  create texture out of bitmap
  create texture out of rle bitmap
  create texture out of qoi data
  blit single texture
  blit single texture Ex
  render geometry
  memcpy
  memset
  rand
  set canvas resolution
  set window resolution
  set audio routine address

misc notes:
  make sure data is aligned to 4 bytes
  audio routine should not alter hardware stack or its data
  (or make sure only 1 routine is going at once)