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millfork/include/m6809/random_6809.mfk

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import random
#if not(ARCH_6809)
#warn random_6809 module should be only used on 6809-compatible targets
#endif
asm byte rand() {
? lda #8
? ldb rand_seed+0
__rand_loop:
aslb
? rolb rand_seed+1
bcc __no_eor
eorb #$2D
__no_eor:
deca
bne __rand_loop
? sta rand_seed+0
? rts
}
inline void init_rand_seed() {
// TODO: find a better source of randomness
rand_seed = 1
}