/************************** I2ICE TUTORIAL SCREEN #20 **************************/
menu=1
define literally P   = 'include scr.19 nolist'
define literally R   = 'include scr.20 nolist'
define literally RTN = 'include scr.20 nolist'
define literally N   = 'include scr.21 nolist'
define literally M   = 'include scr.2 nolist'
cls
/*******************************************************************************/
'                                                      ------------------------'
'      MODULE 2: INTERMEDIATE EMULATION SKILLS        | SCR20: IOPROC          |'
'Before we resume debugging, let''s improve the emula- | M = Go to main menu    |'
'tion screen display so that it displays alphanumeric | N = Next screen        |'
'characters rather than ASCII hex code.  We can       | P = Previous screen    |'
'create an I2ICE procedure (PROC) that converts the   | Q = Quit tutorial      |'
'hex code.  Then we can use the MAPIO command to      | R = Rewrite SCR20      |'
'call this PROC.  A PROC can be saved to a disk and   | SCR# = Screen desired  |'
'then retrieved from the disk.  When you use the       ------------------------'
'name of a PROC followed by <Enter>, the PROC is      '
'executed.  To save you some time, the I/O PROC we will use is already on the'
'disk.  Retrieve it by entering the following command:'
'    INCLUDE IOPROC <Enter>' 
' '
'IOPROC is displayed below.  PROCs used with the MAPIO command have special' 
'features and must use the I2ICE pseudo-variable PORTDATA.  To gain an under-'
'standing of how IOPROC converts the I/O port input and output hex values to'
'alphanumeric screen displays, see the MAPIO command in the I2ICE System'
'Reference Manual.  '
' '
'---------------- To learn more about PROCs, enter MOD_E <Enter> ---------------'