Register

read_input_register, alias rir
$ret = rir( "ireg1");

read_output_register, alias ror
Reads the last value that has been written to an output register.
$ret = rir( "ireg1");

write_output_register, alias wor
$ret = wor("oreg8", 1);

clear_output_register_bit, alias corb
input_register_data_accepted, alias irda
wait_for_input_register, alias wfir
clear_output_register_bit, alias corb
read_and_clear_mca, alias racm
read_input_register_bcd, alias rirbcd
read_input_register_d, alias rird
reset_input_register, alias resir
reset_output_register, alias resor
test_input_register, alias tir
test_output_register, alias tor