;; Implemented based on https://www.pagetable.com/?p=1135, https://github.com/mist64/cbmbus_doc iec_tx_byte: pha ;; Notify all devices that we are going to send a byte ;; and it is going to be a data byte (released ATN) jsr iec_release_atn_clk_data ;; Common part of iec_txbyte and iec_tx_common - waits for devices ;; and transmits a byte pla jsr iec_tx_common ;; All done clc rts