Knowledge Base

Test if the first character in the Rx buffer for the serial port at address pp is the code in X. If so trim it off. Repeat until mismatch. The result in X is the number of characters that have been trimmed.

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 23

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