Knowledge Base

Push the Xth character in the Rx buffer for the serial port at address pp to X, leaving the character in the buffer. The buffer position starts counting from 0. The R register signals outcome. 0 = OK, 1 = buffer did not contain that many characters.

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.