User`s guide
 BDOS FUNCTION 18: SEARCH FOR NEXT
 Entry Parameters:
 Register C: 12H
 Returned Value:
 Registers A: Directory Code
 H: Physical Error
 The Search For Next function is identical to the Search For First function, except
 that the directory scan continues from the last entry that was matched. Function 18
 returns a Directory code in register A, analogous to Function 17.
 Note: in execution sequence, a Function 18 call must follow either a Function 17 or
 another Function 18 call with no other intervening BDOS disk-related function calls.
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BDOS Function Calls  CP/M 3 Programmers Guide










