mirror of
https://github.com/jeremysrand/BuGS.git
synced 2024-06-26 09:29:30 +00:00
59 lines
932 B
ArmAsm
59 lines
932 B
ArmAsm
;
|
|
; random.s
|
|
; BuGS
|
|
;
|
|
; Created by Jeremy Rand on 2020-07-19.
|
|
;Copyright © 2020 Jeremy Rand. All rights reserved.
|
|
;
|
|
|
|
case on
|
|
mcopy random.macros
|
|
keep random
|
|
|
|
random start
|
|
|
|
randInit entry
|
|
lda randomSeed
|
|
sta seed65535
|
|
and #$1f
|
|
bne randInit_store32
|
|
lda #$1f
|
|
randInit_store32 anop
|
|
sta seed32
|
|
rtl
|
|
|
|
|
|
; Returns a number from 1 to 31
|
|
rand32 entry
|
|
lda seed32
|
|
lsr a
|
|
bcc skipEor32
|
|
eor #$0014
|
|
skipEor32 anop
|
|
sta seed32
|
|
rtl
|
|
|
|
; returns a number from 0 to 24
|
|
rand25 entry
|
|
jsl rand32
|
|
dec a
|
|
cmp #25
|
|
bge rand25
|
|
rtl
|
|
|
|
|
|
; Returns a number from 1 to 65535
|
|
rand65535 entry
|
|
lda seed65535
|
|
lsr a
|
|
bcc skipEor65535
|
|
eor #$b400
|
|
skipEor65535 anop
|
|
sta seed65535
|
|
rtl
|
|
|
|
|
|
seed65535 dc i2'0'
|
|
seed32 dc i2'0'
|
|
end
|