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Elite on the BBC Micro

Dashboard: ADPARAMS

[6502 Second Processor version, I/O processor]

Name: ADPARAMS [Show more] Type: Subroutine Category: Dashboard Summary: Implement the OSWRCH 137 <param> command (add a dashboard parameter and update the dashboard when all are received)
Context: See this subroutine in context in the source code References: This subroutine is called as follows: * JMPTAB calls ADPARAMS
.ADPARAMS INC PARANO \ PARANO points to the last free byte in PARAMS, which \ is where we're about to store the new byte in A, so \ increment PARANO to point to the byte after this one LDX PARANO \ Store the new byte in A at position PARANO-1 in TABLE STA PARAMS-1,X \ (which was the last free byte before we incremented \ PARANO above) CPX #PARMAX \ If X >= #PARMAX, skip the following instruction, as we BCS P%+3 \ have now received all the parameters we need to update \ the dashboard RTS \ Otherwise we still have more parameters to receive, so \ return from the subroutine JSR DIALS \ Call DIALS to update the dashboard with the parameters \ in PARAMS JMP PUTBACK \ Jump to PUTBACK to restore the USOSWRCH handler and \ return from the subroutine using a tail call