Routines
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27410: Collect a pseudo-random number (from the ROM)
Used by the routines at 25167, 26426 and 26914.
Output
A Pseudo-random number
27410 LD HL,(31847) Pick up the address of the next pseudo-random number.
27413 LD A,(HL) Copy the number to A.
27414 PUSH AF Save the number briefly.
27415 INC HL Increment the address, rolling over from 8191 to 0.
27416 LD A,H
27417 AND 31
27419 LD H,A
27420 LD (31847),HL Save the new address.
27423 POP AF Restore the pseudo-random number to A.
27424 RET
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