Routines
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42294: Wait For A Key With Timeout
Used by the routine at ReadCommandLine_CommandLinePrints.
Waits for a key until the timer at 41017+2 runs out. GetKeypress sets bit 7 when a key is pressed. When the timer expires, DeleteInputCharacter runs. Either way the timer is reset to 3000.
WaitForKeyWithTimeout 42294 PUSH HL Save the pointer and read the timeout at 41017+2.
42295 LD HL,(41019)
WaitForKeyWithTimeout_Loop 42298 CALL GetKeypress Jump ahead to WaitForKeyWithTimeout_KeyPressed if GetKeypress reports a key.
42301 BIT 7,A
42303 JR NZ,WaitForKeyWithTimeout_KeyPressed
42305 LD A,0 Start the delay at zero.
WaitForKeyWithTimeout_0 42307 DEC A Spin until the delay runs out.
42308 PUSH HL
42309 POP HL
42310 JR NZ,WaitForKeyWithTimeout_0
42312 DEC HL Count the timeout down.
42313 LD A,H
42314 OR L
42315 JR NZ,WaitForKeyWithTimeout_Loop
42317 POP HL Restore the pointer from the stack.
42318 PUSH HL Call DeleteInputCharacter, keeping the pointer.
42319 CALL DeleteInputCharacter
42322 XOR A Clear the key code.
WaitForKeyWithTimeout_KeyPressed 42323 AND 127 Clear bit 7 and reset the timeout to 3000.
42325 LD HL,3000
42328 LD (41019),HL
42331 POP HL Restore the saved pointer from the stack.
42332 RET Return.
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