Knowledge Base

Remove the first X characters from the Rx buffer for the serial port at address pp, up to current content. No action if X=0. Pop X

This differs from the same instruction without the leading ‘a’ in that it explicitly nominates a serial port address (pp) rather than the default serial port.

Dialect exclusions: Not available in dialects before 29

Can only exist on boards that have an uncommitted serial port other than the programming port.