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Elite on the BBC Micro

Keyboard: scan_10in [Elite-A, I/O processor]

Name: scan_10in [Show more] Type: Subroutine Category: Keyboard Summary: Implement the scan_10in command (scan the keyboard)
Context: See this subroutine in context in the source code References: This subroutine is called as follows: * tube_table calls scan_10in

This routine is run when the parasite sends a scan_10in command. It scans the keyboard for a key press and returns the internal key number of the key being to the parasite (or it returns 0 if no keys are being pressed).
.scan_10in JSR RDKEY \ Scan the keyboard for a key press and return the \ internal key number in X (or 0 for no key press) JMP tube_put \ Send A back to the parasite and return from the \ subroutine using a tail call