Difference between revisions of "83:ROMCalls:4014"
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'''Official Name:''' GetCSC | '''Official Name:''' GetCSC | ||
| − | ''' | + | '''Call Address:''' 4014 |
This routine returns the Current Scan Code into register A. | This routine returns the Current Scan Code into register A. | ||
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=== Outputs === | === Outputs === | ||
| − | * | + | * A = ([[83:RAM:8000|kbdScanCode]]) |
* ([[83:RAM:8000|kbdScanCode]]) = 0 | * ([[83:RAM:8000|kbdScanCode]]) = 0 | ||
* kbdSCR,(iy+[[83:Flags:00|kbdFlags]]) reset | * kbdSCR,(iy+[[83:Flags:00|kbdFlags]]) reset | ||
| − | * | + | * HL = [[83:RAM:8000|kbdScanCode]] |
| − | * | + | * BC,DE,F preserved |
== Comments == | == Comments == | ||
| − | This routine expects that either interrupts are enabled or [[83:ROMCalls:4010|KbdScan]] was called manually. Either of these routines will check the keyboard and load the appropriate scan code into | + | This routine expects that either interrupts are enabled or [[83:ROMCalls:4010|KbdScan]] was called manually. Either of these routines will check the keyboard and load the appropriate scan code into [[83:RAM:8000|kbdScanCode]] and set the flag kbdSCR,(iy+[[83:Flags:00|kbdFlags]]). |
| + | |||
| + | Arrow keys and DEL will repeat if held down, while others will not; see notes on [[83:ROMCalls:4010|KbdScan]]. | ||
Latest revision as of 19:32, 17 June 2020
Contents
Synopsis
Official Name: GetCSC
Call Address: 4014
This routine returns the Current Scan Code into register A.
Inputs
- none
Outputs
- A = (kbdScanCode)
- (kbdScanCode) = 0
- kbdSCR,(iy+kbdFlags) reset
- HL = kbdScanCode
- BC,DE,F preserved
Comments
This routine expects that either interrupts are enabled or KbdScan was called manually. Either of these routines will check the keyboard and load the appropriate scan code into kbdScanCode and set the flag kbdSCR,(iy+kbdFlags).
Arrow keys and DEL will repeat if held down, while others will not; see notes on KbdScan.
