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BBC Micro Elite

Flight: DOFE21 (6502SP version)

Name: DOFE21 [View in context] Type: Subroutine Category: Flight Summary: Implement the #DOFE21 <flag> command (show the energy bomb effect)
This routine is run when the parasite sends a #DOFE21 <flag> command. It takes the argument and stores it in SHEILA &21 to change the palette. See p.379 of the Advanced User Guide for an explanation of palette bytes. Arguments: A The new value of SHEILA &21
.DOFE21 STA &FE21 \ Store the new value in SHEILA &21 JMP PUTBACK \ Jump to PUTBACK to restore the USOSWRCH handler and \ return from the subroutine using a tail call