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Flight: SHD

[BBC Micro disc version, Docked]

Name: SHD [Show more] Type: Subroutine Category: Flight Summary: Charge a shield and drain some energy from the energy banks
Context: See this subroutine in context in the source code References: No direct references to this subroutine in this source file

Charge up a shield, and if it needs charging, drain some energy from the energy banks.
Arguments: X The value of the shield to recharge
DEX \ Increment the shield value so that it doesn't go past \ a maximum of 255 RTS \ Return from the subroutine .SHD INX \ Increment the shield value BEQ SHD-2 \ If the shield value is 0 then this means it was 255 \ before, which is the maximum value, so jump to SHD-2 \ to bring it back down to 258 and return \ Otherwise fall through into DENGY to drain our energy \ to pay for all this shield charging